JP2009027825A

JP2009027825A - Protective relay device

Info

Publication number: JP2009027825A
Application number: JP2007187977A
Authority: JP
Inventors: Masami Takenaka; 正実竹中; Yoshiaki Date; 義明伊達
Original assignee: Chugoku Electric Power Co Inc
Current assignee: Chugoku Electric Power Co Inc
Priority date: 2007-07-19
Filing date: 2007-07-19
Publication date: 2009-02-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective relay device for protecting a three-phase AC circuit against a short-circuit failure, in which the number of installed current transformers and short-circuit protective relays can be further reduced. <P>SOLUTION: The protective relay device is provided with a first straight through-type current transformer 10<SB>1</SB>in which R-phase and S-phase of a power transmission line straightly penetrate in the same direction through an annular iron core having a secondary coil wound therearound; a second straight through-type current transformer 10<SB>2</SB>in which S-phase and T-phase of a power transmission line straightly penetrate in the same direction through an annular iron core having a secondary coil wound therearound and which is differentially connected to the first straight through-type current transformer 10<SB>1</SB>; and an overcurrent relay 4 for collectively interrupting first-third breakers 2<SB>1</SB>-2<SB>3</SB>installed on the R-, S- and T-phases of the power transmission line when detecting a short-circuit failure on the basis of a short-circuit current I<SB>Ry</SB>to be inputted from the differentially connected first and second straight through-type current transformers 10<SB>1</SB>, 10<SB>2</SB>. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、保護継電装置に関し、特に、短絡事故から三相交流回路を保護するための変流器および短絡保護継電器の設置台数を削減するのに好適な保護継電装置に関する。 The present invention relates to a protective relay device, and more particularly, to a protective relay device suitable for reducing the number of installed current transformers and short-circuit protective relays for protecting a three-phase AC circuit from a short-circuit accident.

従来、三相交流回路では、短絡事故から三相交流回路を保護するために、過電流継電器（ＯＣ）を相ごとに設置している（たとえば下記の特許文献１参照）。 Conventionally, in a three-phase AC circuit, an overcurrent relay (OC) is installed for each phase in order to protect the three-phase AC circuit from a short circuit accident (see, for example, Patent Document 1 below).

また、末端回路の送配電線などでは、短絡電流が２相に流れることを利用し、過電流継電器を２相にだけ設置して、設備コストの抑制を図っている。たとえば、図１６に示すように、送配電線のＲ相、Ｓ相およびＴ相のうちＲ相およびＴ相にそれぞれ設置された第１および第２の変流器（ＣＴ）３₁，３₂に第１および第２の過電流継電器（ＯＣ）４₁，４₂をそれぞれ接続して、送配電線において短絡事故が発生したときには、以下に示すように、その事故様相に応じて送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃を第１および第２の過電流継電器４₁，４₂で一括遮断している。
（１）Ｒ相−Ｓ相間の短絡事故の場合
送配電線のＲ相およびＳ相に短絡電流が流れるので、Ｒ相に設置された第１の変流器３₁から入力される短絡電流に基づいて第１の過電流継電器４₁が動作して第１乃至第３の遮断器２₁〜２₃を一括遮断する。
（２）Ｓ相−Ｔ相間の短絡事故の場合
送配電線のＳ相およびＴ相に短絡電流が流れるので、Ｔ相に設置された第２の変流器３₂から入力される短絡電流に基づいて第２の過電流継電器４₂が動作して第１乃至第３の遮断器２₁〜２₃を一括遮断する。
（３）Ｔ相−Ｒ相間の短絡事故の場合
送配電線のＲ相およびＴ相に短絡電流が流れるので、Ｒ相およびＴ相にそれぞれ設置された第１および第２の変流器３₁，３₂からそれぞれ入力される短絡電流に応じて第１および第２の過電流継電器４₁，４₂が動作して第１乃至第３の遮断器２₁〜２₃を一括遮断する。
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｒ相、Ｓ相およびＴ相に短絡電流が流れるので、Ｒ相およびＴ相にそれぞれ設置された第１および第２の変流器３₁，３₂からそれぞれ入力される短絡電流に基づいて第１および第２の過電流継電器４₁，４₂が動作して第１乃至第３の遮断器２₁〜２₃を一括遮断する。
特開平８−００５６５９号公報 Moreover, in the power transmission / distribution line of the terminal circuit, etc., the short circuit current flows in two phases, and an overcurrent relay is installed only in the two phases to reduce the equipment cost. For example, as shown in FIG. 16, first and second current transformers (CT) 3 ₁ , 3 ₂ installed in the R phase and the T phase, respectively, among the R phase, S phase, and T phase of the transmission and distribution line. When the first and second overcurrent relays (OC) 4 ₁ , 4 ₂ are connected to each other and a short-circuit accident occurs in the transmission / distribution line, the transmission / distribution line depends on the aspect of the accident as shown below. The _first to _third circuit breakers 2 ₁ to 2 ₃ installed in the R phase, S phase, and T phase are collectively disconnected by the first and second overcurrent relays 4 ₁ and 4 ₂ , respectively.
(1) In the case of a short-circuit accident between the R phase and the S phase Since a short circuit current flows in the R phase and S phase of the transmission and distribution line, the short circuit current input from the _first current transformer 31 installed in the R phase Based on this, the first overcurrent relay 4 ₁ operates to collectively shut off the _first to _third circuit breakers 2 ₁ to 2 ₃ .
(2) Since the S-phase -T where transmission and distribution lines of a short circuit between the phases S phase and T phase short-circuit current flows, the short-circuit current which is input from the second current transformer 3 ₂ installed on the T-phase Based on this, the second overcurrent relay 4 ₂ operates to cut off the _first to _third circuit breakers 2 ₁ to 2 ₃ at _once .
(3) In the case of a short circuit accident between the T phase and the R phase Since a short circuit current flows in the R phase and the T phase of the transmission and distribution line, the first and second current transformers 3 ₁ installed in the R phase and the T phase, respectively. , 3 ₂ , the first and second overcurrent relays 4 ₁ , 4 ₂ operate in response to the short-circuit currents respectively input from the _first to _third circuit breakers 2 ₁ to 2 ₃ .
(4) In the case of a short circuit accident between the R phase, the S phase, and the T phase Since a short circuit current flows in the R phase, the S phase, and the T phase, the first and second current transformers installed in the R phase and the T phase, respectively. The first and second overcurrent relays 4 ₁ and 4 ₂ operate on the basis of the short-circuit currents input from 3 ₁ and 3 ₂ , respectively, and collectively cut off the _first to _third circuit breakers 2 ₁ to 2 _3. .
JP-A-8-005659

しかしながら、１つの送配電線につき変流器および過電流継電器を３台または２台ずつ設置しているため、以下に示すような問題があった。
（１）変流器および過電流継電器の設置台数を更に少なくして設備コストの削減を図りたいという要請がある。
（２）過電流継電器の設置台数が２台である場合には、自回路の短絡事故からは三相交流回路を保護することはできるが、過電流継電器を設置していない相と他回路にまたがる短絡事故については検出することができないため、電源側の短絡保護継電器で三相交流回路を保護することになるので、停電の範囲が拡大する。 However, since three or two current transformers and two overcurrent relays are installed for each transmission / distribution line, there are the following problems.
(1) There is a demand to reduce the installation cost by further reducing the number of installed current transformers and overcurrent relays.
(2) If the number of overcurrent relays is two, the three-phase AC circuit can be protected from a short circuit accident in its own circuit, but the phase where no overcurrent relay is installed and other circuits Moreover, since the short circuit accident which straddles cannot be detected, the short circuit protection relay on the power source side protects the three-phase AC circuit, thereby expanding the range of the power failure.

このような問題は、変圧器内部の短絡事故から三相交流回路を保護するための電流差動継電器、構内における短絡事故から三相交流回路を保護するための受電保護継電器または分割受電保護継電器として使用されている過電流継電器や、送配電線の電源端母線側および受電端母線側にそれぞれ設置されて使用されるパルス符号変調電流差動継電器（ＰＣＭ電流差動継電器）などについても存在する。 Such a problem is a current differential relay for protecting the three-phase AC circuit from a short circuit accident inside the transformer, a power receiving protection relay or a split power receiving protective relay for protecting the three phase AC circuit from a short circuit accident in the premises. There are also overcurrent relays used, and pulse code modulation current differential relays (PCM current differential relays) installed and used on the power supply terminal bus side and the power reception terminal bus side of the transmission and distribution lines.

本発明の目的は、短絡事故から三相交流回路を保護するための変流器および短絡保護継電器の設置台数を更に削減することができる保護継電装置を提供することにある。 An object of the present invention is to provide a protective relay device capable of further reducing the number of installed current transformers and short-circuit protective relays for protecting a three-phase AC circuit from a short-circuit accident.

本発明の保護継電装置は、短絡事故から三相交流回路を保護するための保護継電装置であって、２次コイルを巻装した環状鉄心に前記三相交流回路の第１の相および第２の相を同じ向きにストレートに貫通させたストレート貫通変流器と、２次コイルを巻装した環状鉄心に前記三相交流回路の前記第２の相および第３の相を同じ向きにストレートに貫通させた、かつ、前記ストレート貫通変流器と差接続された他のストレート貫通変流器と、前記差接続されたストレート貫通変流器および他のストレート貫通変流器から入力される短絡電流に基づいて短絡事故を検出すると、前記三相交流回路の各相に設置された遮断器を一括遮断する短絡保護継電器とを具備することを特徴とする。
前記ストレート貫通変流器が、送配電線に設置された第１のストレート貫通変流器（１０₁）であり、前記他のストレート貫通変流器が、前記送配電線に設置された第２のストレート貫通変流器（１０₂）であり、前記第１および第２のストレート貫通変流器が差接続されており、前記短絡保護継電器が、前記差接続された第１および第２のストレート貫通変流器から入力される短絡電流（Ｉ_Ry）に基づいて短絡事故を検出すると、前記送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）を一括遮断する過電流継電器（４）であってもよい。
前記ストレート貫通変流器が、変圧器（５）の１次側および２次側にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記変圧器の１次側および２次側にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１および第２のストレート貫通変流器が差接続されており、前記第３および第４のストレート貫通変流器が差接続されており、前記短絡保護継電器が、前記差接続された第１および第２のストレート貫通変流器から入力される短絡電流と前記差接続された第２および第４のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記変圧器の１次側の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と該変圧器の２次側の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とを一括遮断する電流差動継電器（２０）であってもよい。
前記ストレート貫通変流器が、母線から分岐された第１および第２の送配電線（１Ｌ，２Ｌ）にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記第１および第２の送配電線にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１および第２のストレート貫通変流器が差接続されており、前記第３および第４のストレート貫通変流器が差接続されており、前記短絡保護継電器が、前記差接続された第１および第２のストレート貫通変流器から入力される短絡電流と前記差接続された第３および第４のストレート貫通変流器から入力される短絡電流との和電流に基づいて短絡事故を検出すると、前記第１の送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記第２の送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とを一括遮断する過電流継電器（３０）であってもよい。
前記ストレート貫通変流器が、第１の母線から分岐された第１の送配電線（１Ｌ）に設置された第１のストレート貫通変流器（１０₁）と、第２の母線から分岐された第２の送配電線（２Ｌ）に設置された第３のストレート貫通変流器（１０₃）と、前記第１の母線または前記第２の母線に設置された第５のストレート貫通変流器（１０₅）とであり、前記他のストレート貫通変流器が、前記第１の送配電線に設置された第２のストレート貫通変流器（１０₂）と、前記第２の送配電線に設置された第４のストレート貫通変流器（１０₄）と、前記第１の母線または前記第２の母線に設置された第６のストレート貫通変流器（１０₆）とであり、前記第１および第２のストレート貫通変流器が差接続されており、前記第３および第４のストレート貫通変流器が差接続されており、前記第５および第６のストレート貫通変流器が差接続されており、前記短絡保護継電器が、前記差接続された第１および第２のストレート貫通変流器から入力される短絡電流と前記差接続された第５および第６のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第１の送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記第１および第２の母線の各相間に設置された第７乃至第９の遮断器（２₇〜２₉）とを一括遮断する第１の過電流継電器（４０₁）と、前記差接続された第３および第４のストレート貫通変流器から入力される短絡電流と前記差接続された第５および第６のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第２の送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）と前記第７乃至第９の遮断器とを一括遮断する第２の過電流継電器（４０₂）とであってもよい。
前記ストレート貫通変流器が、送配電線の電源端母線側および受電端母線側にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記送配電線の前記電源端母線側および前記受電端母線側にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１および第２のストレート貫通変流器が差接続されており、前記第３および第４のストレート貫通変流器が差接続されており、前記短絡保護継電器が、前記差接続された第１および第２のストレート貫通変流器からの短絡電流と前記差接続された第３および第４のストレート貫通変流器からの短絡電流との差電流に基づいて短絡事故を検出すると、前記電源端母線側の前記送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記受電端母線側の前記送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とをそれぞれ一括遮断する第１および第２のパルス符号変調電流差動継電器（６０₁，６０₂）であってもよい。
前記送配電線または前記母線の線間電圧、相電圧または相・線間電圧に基づいて事故様相を判定して、該事故様相の判定結果に応じて前記差接続されたストレート貫通変流器および他のストレート貫通変流器から入力される短絡電流を１倍、１／２倍または１／３^1/2倍とする演算処理手段をさらに具備してもよい。
また、本発明の保護継電装置は、短絡事故から三相交流回路を保護するための保護継電装置であって、２次コイルを巻装した環状鉄心に前記三相交流回路の第１の相および第２の相を同じ向きにストレートに貫通させたストレート貫通変流器と、２次コイルを巻装した環状鉄心に前記三相交流回路の前記第２の相および第３の相を同じ向きにストレートに貫通させた他のストレート貫通変流器と、前記ストレート貫通変流器から入力される短絡電流に基づいて短絡事故を検出すると、該三相交流回路の各相に設置された遮断器を一括遮断する第１の短絡保護継電器と、前記他のストレート貫通変流器から入力される短絡電流に基づいて短絡事故を検出すると、前記遮断器を一括遮断する第２の短絡保護継電器とを具備することを特徴とする。
ここで、前記三相交流回路の前記第１の相と前記第２の相との間の短絡事故である場合には、前記第２の短絡保護継電器のみが動作して前記遮断器を一括遮断し、前記三相交流回路の前記第２の相と前記第３の相との間の短絡事故である場合には、前記第１の短絡保護継電器のみが動作して前記遮断器を一括遮断してもよい。
前記ストレート貫通変流器が、送配電線に設置された第１のストレート貫通変流器（１０₁）であり、前記他のストレート貫通変流器が、前記送配電線に設置された第２のストレート貫通変流器（１０₂）であり、前記第１の短絡保護継電器が、前記第１のストレート貫通変流器から入力される第１の短絡電流（Ｉ_Ry1）に基づいて短絡事故を検出すると、前記送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）を一括遮断する第１の過電流継電器（４₁）であり、前記第２の短絡保護継電器が、前記第２のストレート貫通変流器から入力される第２の短絡電流（Ｉ_Ry2）に基づいて短絡事故を検出すると、前記第１乃至第３の遮断器を一括遮断する第２の過電流継電器（４₂）であってもよい。
前記ストレート貫通変流器が、変圧器（５）の１次側および２次側にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記変圧器の１次側および２次側にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１の短絡保護継電器が、前記第１のストレート貫通変流器から入力される短絡電流と前記第３のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記変圧器の１次側の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と該変圧器の２次側の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とを一括遮断する第１の電流差動継電器（２０₁）であり、前記第２の短絡保護継電器が、前記第２のストレート貫通変流器から入力される短絡電流と前記第４のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第１乃至第３の遮断器と前記第４乃至第６の遮断器とを一括遮断する第２の電流差動継電器（２０₂）であってもよい。
前記ストレート貫通変流器が、母線から分岐された第１および第２の送配電線（１Ｌ，２Ｌ）にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記第１および第２の送配電線にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１の短絡保護継電器が、前記第１のストレート貫通変流器から入力される短絡電流と前記第３のストレート貫通変流器から入力される短絡電流との和電流に基づいて短絡事故を検出すると、前記第１の送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記第２の送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とを一括遮断する第１の過電流継電器（３０₁）であり、前記第２の短絡保護継電器が、前記第２のストレート貫通変流器から入力される短絡電流と前記第４のストレート貫通変流器から入力される短絡電流との和電流に基づいて短絡事故を検出すると、前記第１乃至第３の遮断器と前記第４乃至第６の遮断器とを一括遮断する第２の過電流継電器（３０₂）であってもよい。
前記ストレート貫通変流器が、第１の母線から分岐された第１の送配電線（１Ｌ）に設置された第１のストレート貫通変流器（１０₁）と、第２の母線から分岐された第２の送配電線（２Ｌ）に設置された第３のストレート貫通変流器（１０₃）と、前記第１の母線または前記第２の母線に設置された第５のストレート貫通変流器（１０₅）とであり、前記他のストレート貫通変流器が、前記第１の送配電線に設置された第２のストレート貫通変流器（１０₂）と、前記第２の送配電線に設置された第４のストレート貫通変流器（１０₄）と、前記第１の母線または前記第２の母線に設置された第６のストレート貫通変流器（１０₆）とであり、前記第１の短絡保護継電器が、前記第１のストレート貫通変流器から入力される短絡電流と前記第５のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第１の送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記第１および第２の母線の各相間に設置された第７乃至第９の遮断器（２₇〜２₉）とを一括遮断する第１の過電流継電器（４０₁）と、前記第３のストレート貫通変流器から入力される短絡電流と前記第５のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第２の送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）と前記第７乃至第９の遮断器とを一括遮断する第２の過電流継電器（４０₂）とであり、前記第２の短絡保護継電器が、前記第２のストレート貫通変流器から入力される短絡電流と前記第６のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第１乃至第３の遮断器と前記第７乃至第９の遮断器とを一括遮断する第３の過電流継電器（４０₃）と、前記第４のストレート貫通変流器から入力される短絡電流と前記第６のストレート貫通変流器から入力される短絡電流との差電流に基づいて短絡事故を検出すると、前記第４乃至第６の遮断器と前記第７乃至第９の遮断器とを一括遮断する第４の過電流継電器（４０₄）とであってもよい。
前記ストレート貫通変流器が、送配電線の電源端母線側および受電端母線側にそれぞれ設置された第１および第３のストレート貫通変流器（１０₁，１０₃）であり、前記他のストレート貫通変流器が、前記送配電線の前記電源端母線側および前記受電端母線側にそれぞれ設置された第２および第４のストレート貫通変流器（１０₂，１０₄）であり、前記第１の短絡保護継電器が、前記第１のストレート貫通変流器からの短絡電流と前記第３のストレート貫通変流器からの短絡電流との差電流に基づいて短絡事故を検出すると、前記電源端母線側の前記送配電線の各相に設置された第１乃至第３の遮断器（２₁〜２₃）と前記受電端母線側の前記送配電線の各相に設置された第４乃至第６の遮断器（２₄〜２₆）とをそれぞれ一括遮断する第１および第２のパルス符号変調電流差動継電器（６０₁，６０₂）であり、前記第２の短絡保護継電器が、前記第２のストレート貫通変流器からの短絡電流と前記第４のストレート貫通変流器からの短絡電流との差電流に基づいて短絡事故を検出すると、前記第１乃至第３の遮断器と前記第４乃至第６の遮断器とをそれぞれ一括遮断する第３および第４のパルス符号変調電流差動継電器（６０₃，６０₄）であってもよい。 The protective relay device of the present invention is a protective relay device for protecting a three-phase AC circuit from a short circuit accident, and includes a first phase of the three-phase AC circuit and an annular iron core wound with a secondary coil. A straight through current transformer in which the second phase is passed straight in the same direction and an annular iron core wound with a secondary coil in the same direction for the second phase and the third phase of the three-phase AC circuit Input from other straight through current transformers that are straight through and differentially connected to the straight through current transformer, and from the straight through current transformer and other straight through current transformers that are differentially connected. When a short-circuit accident is detected based on a short-circuit current, a short-circuit protection relay that collectively shuts off the circuit breakers installed in each phase of the three-phase AC circuit is provided.
The straight through current transformer is a first straight through current transformer (10 ₁ ) installed on the transmission / distribution line, and the other straight through current transformer is a second installed on the transmission / distribution line. Straight through current transformer (10 ₂ ), wherein the first and second straight through current transformers are differentially connected, and the short-circuit protective relay is the differentially connected first and second straight When a short circuit fault is detected based on the short circuit current (I _Ry ) input from the feedthrough current transformer, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in the respective phases of the transmission and distribution lines are connected. The overcurrent relay (4) which cuts off collectively may be sufficient.
The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the primary side and the secondary side of the transformer (5), respectively. Straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the primary side and the secondary side of the transformer, and the first and second Are connected to each other, the third and fourth straight through current transformers are connected to each other, and the short-circuit protective relay is connected to the first and second straight terminals connected to each other. When a short circuit fault is detected based on a difference current between a short circuit current input from a through current transformer and a short circuit current input from the second and fourth straight through current transformers connected to the difference, 1st to 1st installed in each phase on the primary side Of the circuit breaker (2 ₁ to 2 ₃₎ and the fourth to sixth breaker installed in each phase of the secondary side of the transformer (2 _4-2 ₆₎ and the current differential relay for collectively blocking ( 20).
The first and third straight through current transformers (10 ₁ , 10 ₃ ) are installed in the first and second transmission / distribution lines (1L, 2L) branched from the bus. And the other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed in the first and second transmission and distribution lines, The first and second straight through current transformers are differentially connected, the third and fourth straight through current transformers are differentially connected, and the short-circuit protection relay is the differentially connected first When a short circuit fault is detected based on the sum of the short circuit current input from the second straight through current transformer and the short circuit current input from the third and fourth straight through current transformers connected to each other , Each phase of the first transmission and distribution line The installed first to third circuit breaker and (2 ₁ to 2 ₃₎ and the fourth to sixth breaker installed in each phase of the second transmission and distribution lines (2 _4-2 ₆₎ The overcurrent relay (30) which cuts off collectively may be sufficient.
The straight through current transformer is branched from the first straight through current transformer (10 ₁ ) installed in the first transmission / distribution line (1L) branched from the first bus and the second bus. And a third straight through current transformer (10 ₃ ) installed in the second power transmission and distribution line (2L) and a fifth straight through current transformer installed in the first bus bar or the second bus bar. vessel ₍₁₀₅₎ is at the said other straight through current transformer, a second straight through current transformer installed in the first transmission and distribution lines (10 _2), said second transmission and distribution A fourth straight through current transformer (10 ₄ ) installed in the electric wire, and a sixth straight through current transformer (10 ₆ ) installed in the first bus bar or the second bus bar, The first and second straight through current transformers are differentially connected, and the third and fourth strains are connected. Through-current transformers are differentially connected, the fifth and sixth straight through-current transformers are differentially connected, and the short-circuit protection relay is connected to the differentially connected first and second straight through-current transformers. When a short circuit fault is detected based on a difference current between a short circuit current input from a current transformer and a short circuit current input from the fifth and sixth straight through current transformers connected to the difference, the first transmission is detected. First to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the distribution line and seventh to ninth circuit breakers (2) installed between the phases of the first and second bus bars ₇ and to 2 ₉₎ and the first over current relay for collectively blocking (40 _1), which is the difference connected to the short-circuit current which is inputted from the third and fourth straight through current transformer which is connected the difference Difference current from short-circuit current input from fifth and sixth straight through current transformers Upon detection of a short circuit on the basis of, collectively and fourth to sixth breaker (2 _4-2 ₆₎ and the seventh to ninth circuit breaker installed in each phase of the second transmission and distribution lines The second overcurrent relay (40 ₂ ) to be cut off may be used.
The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) respectively installed on the power supply end bus side and the receiving end bus side of the transmission / distribution line. Straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution line, The first and second straight through current transformers are differentially connected, the third and fourth straight through current transformers are differentially connected, and the short-circuit protection relay is the differentially connected first When a short-circuit fault is detected based on the difference between the short-circuit current from the second straight through current transformer and the short-circuit current from the third and fourth straight through current transformers connected to the difference, Of the transmission and distribution lines on the busbar side The first to third circuit breaker installed in the phase (2 ₁ to 2 ₃₎ and the fourth to sixth breaker installed in each phase of the transmission and distribution lines of the receiving end bus side (2 ₄ - 2 ₆ ) and the first and second pulse code modulation current differential relays (60 ₁ , 60 ₂ ) may be used.
A straight through current transformer connected to the difference in accordance with a determination result of the accident aspect, determining an accident aspect based on a line voltage, a phase voltage, or a phase-line voltage of the transmission / distribution line or the bus Arithmetic processing means for making the short-circuit current input from another straight through current transformer 1 time, ^1/2 time, or 1/3 ^1/2 times may be further provided.
The protective relay device of the present invention is a protective relay device for protecting a three-phase AC circuit from a short circuit accident, and the first of the three-phase AC circuit is mounted on an annular iron core wound with a secondary coil. A straight through current transformer in which a phase and a second phase are straightly penetrated in the same direction, and an annular core around which a secondary coil is wound, the second phase and the third phase of the three-phase AC circuit are the same When a short-circuit fault is detected based on the other straight-through current transformer that is straight-through in the direction and the short-circuit current input from the straight-through current transformer, the interruption installed in each phase of the three-phase AC circuit A first short-circuit protection relay that collectively shuts off the circuit breaker, and a second short-circuit protection relay that collectively shuts off the circuit breaker when a short-circuit fault is detected based on a short-circuit current input from the other straight through current transformer It is characterized by comprising.
Here, in the case of a short-circuit accident between the first phase and the second phase of the three-phase AC circuit, only the second short-circuit protection relay operates to collectively shut off the circuit breaker. In the case of a short-circuit accident between the second phase and the third phase of the three-phase AC circuit, only the first short-circuit protective relay operates to collectively shut off the circuit breakers. May be.
The straight through current transformer is a first straight through current transformer (10 ₁ ) installed on the transmission / distribution line, and the other straight through current transformer is a second installed on the transmission / distribution line. Straight through current transformer (10 ₂ ), and the first short circuit protection relay causes a short circuit fault based on the first short circuit current (I _Ry1 ) input from the first straight through current transformer. When detected, it is a first overcurrent relay (4 ₁ ) that collectively cuts off the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the transmission and distribution lines, and the second overcurrent relay (4 ₁ ) When the short-circuit protection relay detects a short-circuit fault based on the second short-circuit current (I _Ry2 ) input from the second straight through current transformer, the first to third circuit breakers are collectively shut off. 2 overcurrent relays (4 ₂ ).
The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the primary side and the secondary side of the transformer (5), respectively. Straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the primary side and the secondary side of the transformer, and the first short circuit protection When the relay detects a short-circuit fault based on a difference current between a short-circuit current input from the first straight through current transformer and a short-circuit current input from the third straight through current transformer, the transformer First to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase on the primary side and fourth to sixth circuit breakers installed on each phase on the secondary side of the transformer ( 2 _4-2 ₆₎ and the a first current differential relay for collectively blocking (20 _1), the second When the fault protection relay detects a short-circuit accident based on a difference current between a short-circuit current input from the second straight through current transformer and a short-circuit current input from the fourth straight through current transformer, A second current differential relay (20 ₂ ) that collectively cuts off the first to third circuit breakers and the fourth to sixth circuit breakers may be used.
The first and third straight through current transformers (10 ₁ , 10 ₃ ) are installed in the first and second transmission / distribution lines (1L, 2L) branched from the bus. And the other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed in the first and second transmission and distribution lines, The first short circuit protection relay detects a short circuit accident based on the sum of the short circuit current input from the first straight through current transformer and the short circuit current input from the third straight through current transformer. Then, the first to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the first transmission / distribution line and the fourth to fourth circuit breakers installed in each phase of the second transmission / distribution line. First overcurrent relay (30 which collectively shuts off ₆ circuit breakers (2 ₄ to 2 ₆ )) ₁ ), and the second short circuit protection relay is configured to obtain a sum current of a short circuit current input from the second straight through current transformer and a short circuit current input from the fourth straight through current transformer. The second overcurrent relay (30 ₂ ) that collectively shuts off the first to third circuit breakers and the fourth to sixth circuit breakers when a short-circuit accident is detected based on the above may be used.
The straight through current transformer is branched from the first straight through current transformer (10 ₁ ) installed in the first transmission / distribution line (1L) branched from the first bus and the second bus. And a third straight through current transformer (10 ₃ ) installed in the second power transmission and distribution line (2L) and a fifth straight through current transformer installed in the first bus bar or the second bus bar. vessel ₍₁₀₅₎ is at the said other straight through current transformer, a second straight through current transformer installed in the first transmission and distribution lines (10 _2), said second transmission and distribution A fourth straight through current transformer (10 ₄ ) installed in the electric wire, and a sixth straight through current transformer (10 ₆ ) installed in the first bus bar or the second bus bar, The first short circuit protection relay is a short circuit current input from the first straight through current transformer and the Upon detection of a short circuit on the basis of the difference current between the short-circuit current input from 5 straight through current transformer, the first to third circuit breakers installed in each phase of the first transmission and distribution lines (2 _{1 to} 2 ₃ ) and the _seventh to _ninth circuit breakers (2 ₇ to 2 ₉ ) installed between the phases of the first and second buses, the first overcurrent relay (40 ₁ ) And the second short-circuit current input from the third straight through current transformer and the short-circuit current input from the fifth straight through current transformer, The second overcurrent relay (40 ₂ ) that collectively shuts off the _fourth to _sixth circuit breakers (2 ₄ to 2 ₆ ) and the seventh to ninth circuit breakers installed in each phase of the transmission / distribution line. ), And the second short-circuit protection relay is input from the second straight through current transformer. When a short circuit fault is detected based on the difference current from the short circuit current input from the sixth straight through current transformer, the first to third circuit breakers and the seventh to ninth circuit breakers are collectively connected. The third overcurrent relay (40 ₃ ) to be cut off, and the difference current between the short-circuit current input from the fourth straight through current transformer and the short-circuit current input from the sixth straight through current transformer When a short circuit accident is detected based on the fourth overcurrent relay, the fourth overcurrent relay (40 ₄ ) that collectively disconnects the fourth to sixth circuit breakers and the seventh to ninth circuit breakers may be used.
The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) respectively installed on the power supply end bus side and the receiving end bus side of the transmission / distribution line. Straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution line, When the first short circuit protection relay detects a short circuit fault based on a difference current between a short circuit current from the first straight through current transformer and a short circuit current from the third straight through current transformer, the power supply First to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the transmission / distribution line on the end bus side and a fourth installed in each phase of the transmission / distribution line on the power receiving end bus side collectively cut off respectively to sixth breaker (2 _4-2 ₆₎ and the 1 and a second pulse code modulation current differential relay is (60 _1, 60 _2), the second short-circuit protection relay is the second the short-circuit current from the straight through current transformer of the fourth straight When a short-circuit fault is detected based on a difference current from a short-circuit current from the feedthrough current transformer, the third and the third circuit breakers collectively cut off the first to third circuit breakers and the fourth to sixth circuit breakers, respectively. Four pulse code modulation current differential relays (60 ₃ , 60 ₄ ) may be used.

本発明の保護継電装置は、以下に示す効果を奏する。
（１）三相交流回路の２相を同じ向きにストレートに貫通させたストレート貫通変流器を２台使用することにより、短絡事故から三相交流回路を保護するための変流器および短絡保護継電器の設置台数を更に削減して、設備コストの削減を図ることができる。
（２）第１のストレート貫通変流器と第１の短絡保護継電器とを接続するとともに第２のストレート貫通変流器と第２の短絡保護継電器とを接続することにより、自回路および他回路にまたがる短絡事故であっても確実に検出することができるので、停電の範囲の拡大を防止することができる。 The protective relay device of the present invention has the following effects.
(1) Current transformer and short-circuit protection to protect the three-phase AC circuit from short-circuit accidents by using two straight-through current transformers that pass two phases of the three-phase AC circuit straight in the same direction. The number of installed relays can be further reduced to reduce the equipment cost.
(2) By connecting the first straight through current transformer and the first short circuit protection relay and connecting the second straight through current transformer and the second short circuit protection relay, the own circuit and other circuits Even if it is a short-circuit accident that spans over, it can be reliably detected, so that it is possible to prevent the expansion of the power outage range.

上記の目的を、２次コイルを巻装した環状鉄心に三相交流回路の第１の相および第２の相を同じ向きにストレートに貫通させたストレート貫通変流器と２次コイルを巻装した環状鉄心に三相交流回路の第２の相および第３の相を同じ向きにストレートに貫通させた他のストレート貫通変流器とを差接続し、短絡保護継電器が、差接続されたストレート貫通変流器および他のストレート貫通変流器から入力される短絡電流に基づいて短絡事故を検出すると、三相交流回路の各相に設置された遮断器を一括遮断することにより実現した。 To achieve the above purpose, a straight through current transformer and a secondary coil, in which a first phase and a second phase of a three-phase AC circuit are straightly passed in the same direction, are wound around an annular core wound with a secondary coil. Connected to other straight through current transformers that are straight through the second and third phases of the three-phase AC circuit in the same direction, and the short-circuit protective relay is connected straight When a short-circuit accident was detected based on a short-circuit current input from a through-type current transformer and other straight through-type current transformers, the circuit breaker installed in each phase of the three-phase AC circuit was shut off collectively.

以下、本発明の保護継電装置の実施例について図面を参照して説明する。
本発明の第１の実施例による保護継電装置は、図１に示すように、送配電線に設置された第１のストレート貫通変流器１０₁と、送配電線に設置された、かつ、第１のストレート貫通変流器１０₁と差接続された第２のストレート貫通変流器１０₂と、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流Ｉ_Ryに基づいて送配電線の短絡事故を検出すると、送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃を一括遮断する過電流継電器４とを具備する。 Embodiments of the protective relay device of the present invention will be described below with reference to the drawings.
Protective relay apparatus according to a first embodiment of the present invention, as shown in FIG. 1, first the straight through-current transformer 10 ₁ installed on transmission and distribution lines, installed in the electric transmission, and , second and straight through current transformer 10 _2, first and second straight through current transformer 10 _1, 10 ₂ from the input which is connected with the first straight through current transformer 10 ₁ and connected When a short-circuit accident of the transmission / distribution line is detected based on the short-circuit current _IRy , the _first to _third circuit breakers 2 ₁ to 2 ₃ installed in the R-phase, S-phase and T-phase of the transmission / distribution line respectively And an overcurrent relay 4 that collectively cuts off.

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に送配電線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に送配電線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、送配電線のＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向（環状鉄心の第１の開口面から環状鉄心の第２の開口面への方向）に貫通されており、送配電線のＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向（環状鉄心の第１の開口面から環状鉄心の第２の開口面への方向）に貫通されている。
また、第２のストレート貫通変流器１０₂は、第２のストレート貫通変流器１０₂から過電流継電器４に出力される短絡電流の極性が第１のストレート貫通変流器１０₁から過電流継電器４に出力される短絡電流の極性の逆となるように、過電流継電器４と接続されている。 The first straight through current transformer 10 ₁ is R phase and the S phase of the transmission and distribution lines to the annular core formed by winding a secondary coil of the through-type current transformer which is passed through straight in the same direction , the second straight through current transformer 10 ₂ is S-phase and T-phase of the transmission and distribution lines to the annular core formed by winding a secondary coil was passed through straight in the same direction through type current transformer.
That is, through the R-phase and S-phase of the electric transmission both first straight through current transformer 10 _first polarity direction (second direction to the opening surface of the annular core from the first opening surface of the annular core) by which, S-phase and T-phase of the transmission and distribution lines are both second straight through current transformer 10 _second polarity direction (direction from the first opening surface of the annular core to a second opening surface of the annular core) It is penetrated by.
In addition, the second straight through current transformer 10 ₂ has the polarity of the short-circuit current output from the second straight through current transformer 10 ₂ to the overcurrent relay 4 excessive from the first straight through current transformer 10 _1. The overcurrent relay 4 is connected so that the polarity of the short circuit current output to the current relay 4 is reversed.

したがって、短絡事故が発生していないときに送配電線のＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、図２に示すようにＲ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとは１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れ、Ｓ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れるため、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される負荷電流ＩはＲ相の負荷電流Ｉ_RとＴ相の負荷電流Ｉ_Tとのベクトル差となり、負荷電流Ｉの振幅はＲ相の負荷電流Ｉ_R（Ｔ相の負荷電流Ｉ_T）の振幅の３^1/2倍となる。
Ｉ＝（Ｉ_R＋Ｉ_S）−（Ｉ_S＋Ｉ_T）＝Ｉ_R−Ｉ_T
｜Ｉ｜＝｜Ｉ_R−Ｉ_T｜＝３^1/2×｜Ｉ_R｜＝３^1/2×｜Ｉ_T｜ Therefore, when the load currents flowing in the R-phase, S-phase and T-phase of the transmission / distribution line are expressed as I _R , I _S and I _T when no short-circuit accident has occurred, the load of the R-phase as shown in FIG. The current I _R and the S-phase load current I _S flow through the annular core of the first straight through current transformer 101 _{1 in} the polarity direction with a phase difference of 120 °, and the S-phase load current I _S and T Since the load current I _T of the phase flows through the annular iron core of the second straight through current transformer 102 _{2 in} the polarity direction with a phase difference of 120 °, the first and second straight through variable currents connected to each other are connected. The load current I input to the overcurrent relay 4 from the current relays 10 ₁ and 10 ₂ is a vector difference between the R-phase load current I _R and the T-phase load current I _T, and the amplitude of the load current I is the R-phase amplitude. It becomes 3 ^1/2 times the amplitude of the load current I _R (T-phase load current I _T ).
I = (I _R + I _S ) − (I _S + I _T ) = I _R −I _T
| I | = | I _R −I _T | = 3 ^1/2 × | I _R | = 3 ^1/2 × | I _T |

また、送配電線に短絡事故が発生したときに送配電線のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryは、短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTのインピーダンス角をθとすると、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｒ相−Ｓ相間の短絡事故が発生すると、図１に破線の矢印で示すように送配電線のＲ相にＲ相の短絡電流Ｉ_FRが内部方向に流れ、送配電線のＳ相にＳ相の短絡電流Ｉ_FSが外部方向に流れるが、送配電線のＴ相にはＴ相の短絡電流Ｉ_FTが流れない。
したがって、第１のストレート貫通変流器１０₁から過電流継電器４に出力される短絡電流ｉ_F1はＲ相の短絡電流Ｉ_FRとＳ相の短絡電流Ｉ_FSとのベクトル和となり、短絡電流ｉ_F1の振幅は“０”となる。
ｉ_F1＝Ｉ_FR＋Ｉ_FS＝０
｜ｉ_F1｜＝｜Ｉ_FR＋Ｉ_FS｜＝０
また、第２のストレート貫通変流器１０₂から過電流継電器４に出力される短絡電流ｉ_F2は、極性が負のＳ相の短絡電流−Ｉ_FSとなり、短絡電流ｉ_F2の振幅はＳ相の短絡電流Ｉ_FSの振幅となる。
ｉ_F2＝−Ｉ_FS
｜ｉ_F2｜＝｜Ｉ_FS｜
その結果、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryは、次式で示すように極性が負のＳ相の短絡電流−Ｉ_FSとなり、短絡電流Ｉ_Ryの振幅はＳ相の短絡電流Ｉ_FSの振幅となる（図３（ａ）参照。なお、図３においては、送配電線の内部方向に流れる短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTは実線の矢印で、送配電線の外部方向に流れる短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTは一点鎖線の矢印で示している。）。
Ｉ_Ry＝ｉ_F1＋ｉ_F2＝−Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｓ相−Ｔ相間の短絡事故が発生すると、送配電線のＳ相にＳ相の短絡電流Ｉ_FSが内部方向に流れ、送配電線のＴ相にＴ相の短絡電流Ｉ_FTが外部方向に流れるが、送配電線のＲ相にはＲ相の短絡電流Ｉ_FRが流れない。
したがって、第１のストレート貫通変流器１０₁から過電流継電器４に出力される短絡電流ｉ_F1はＳ相の短絡電流Ｉ_FSとなり、短絡電流ｉ_F1の振幅はＳ相の短絡電流Ｉ_FSの振幅となる。
ｉ_F1＝Ｉ_FS
｜ｉ_F1｜＝｜Ｉ_FS｜
また、第２のストレート貫通変流器１０₂から過電流継電器４に出力される短絡電流ｉ_F2は、Ｓ相の短絡電流Ｉ_FSとＴ相の短絡電流Ｉ_FTとのベクトル和の極性が反転されたものとなり、短絡電流ｉ_F2の振幅は“０”となる。
ｉ_F2＝−（Ｉ_FS＋Ｉ_FT）＝０
｜ｉ_F2｜＝｜Ｉ_FS＋Ｉ_FT｜＝０
その結果、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryは、次式で示すようにＳ相の短絡電流Ｉ_FSとなり、短絡電流Ｉ_Ryの振幅はＳ相の短絡電流Ｉ_FSの振幅となる（図３（ｂ）参照）。
Ｉ_Ry＝ｉ_F1＋ｉ_F2＝Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｔ相−Ｒ相間の短絡事故が発生すると、送配電線のＴ相にＴ相の短絡電流Ｉ_FTが内部方向に流れ、送配電線のＲ相にＲ相の短絡電流Ｉ_FRが外部方向に流れるが、送配電線のＳ相にはＳ相の短絡電流Ｉ_FSが流れない。
したがって、第１のストレート貫通変流器１０₁から過電流継電器４に出力される短絡電流ｉ_F1はＲ相の短絡電流Ｉ_FRとなり、短絡電流ｉ_F1の振幅はＲ相の短絡電流Ｉ_FRの振幅となる。
ｉ_F1＝Ｉ_FR
｜ｉ_F1｜＝｜Ｉ_FR｜
また、第２のストレート貫通変流器１０₂から過電流継電器４に出力される短絡電流ｉ_F2は、極性が負のＴ相の短絡電流−Ｉ_FTとなり、短絡電流ｉ_F2の振幅はＴ相の短絡電流Ｉ_FTの振幅となる。
ｉ_F2＝−Ｉ_FT
｜ｉ_F2｜＝｜Ｉ_FT｜
その結果、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryは、次式で示すようにＲ相の短絡電流Ｉ_FRとＴ相の短絡電流Ｉ_FTとのベクトル差となり、短絡電流Ｉ_Ryの振幅はＲ相の短絡電流Ｉ_FR（Ｔ相の短絡電流Ｉ_FT）の振幅の２倍となる（図３（ｃ）参照）。
Ｉ_Ry＝ｉ_F1＋ｉ_F2＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝｜Ｉ_FR−Ｉ_FT｜＝２×｜Ｉ_FR｜＝２×｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｒ相−Ｓ相−Ｔ相間の短絡事故が発生すると、送配電線のＲ相、Ｓ相およびＴ相にＲ相の短絡電流Ｉ_FR、Ｓ相の短絡電流Ｉ_FSおよびＴ相の短絡電流Ｉ_FTが位相差１２０°で内部方向にそれぞれ流れる。
したがって、第１のストレート貫通変流器１０₁から過電流継電器４に出力される短絡電流ｉ_F1はＲ相の短絡電流Ｉ_FRとＳ相の短絡電流Ｉ_FSとのベクトル和となり、短絡電流ｉ_F1の振幅はＲ相の短絡電流Ｉ_FR（Ｓ相の短絡電流Ｉ_FS）の振幅となる。
ｉ_F1＝Ｉ_FR＋Ｉ_FS
｜ｉ_F1｜＝｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
また、第２のストレート貫通変流器１０₂から過電流継電器４に出力される短絡電流ｉ_F2は、Ｓ相の短絡電流Ｉ_FSとＴ相の短絡電流Ｉ_FTとのベクトル和の極性が反転されたものとなり、短絡電流ｉ_F2の振幅はＳ相の短絡電流Ｉ_FS（Ｔ相の短絡電流Ｉ_FT）の振幅となる。
ｉ_F2＝−（Ｉ_FS＋Ｉ_FT）
｜ｉ_F2｜＝｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜
その結果、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryは、次式で示すようにＲ相の短絡電流Ｉ_FRとＴ相の短絡電流Ｉ_FTとのベクトル差となり、短絡電流Ｉ_Ryの振幅はＲ相の短絡電流Ｉ_FR（Ｔ相の短絡電流Ｉ_FT）の振幅の３^1/2倍となる（図３（ｄ）参照）。
Ｉ_Ry＝ｉ_F1＋ｉ_F2＝（Ｉ_FR＋Ｉ_FS）＋｛−（Ｉ_FS＋Ｉ_FT）｝＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝｜Ｉ_FR−Ｉ_FT｜＝３^1/2×｜Ｉ_FR｜＝３^1/2×｜Ｉ_FT｜ Also, when the short-circuit current flowing in the R-phase, S-phase and T-phase of the transmission / distribution line is represented by I _FR , I _FS and I _FT when a short-circuit accident occurs in the transmission / distribution line, the first and second differentially connected The short-circuit current I _Ry input to the overcurrent relay 4 from the straight through current transformers 10 ₁ and 10 _{2 of} _No. ₂ depends on the accident situation, _{assuming that} the impedance angles of the short-circuit currents I _FR , I _FS , and I _FT are θ. It is expressed as follows.
(1) In the case of a short circuit accident between the R phase and the S phase When a short circuit accident between the R phase and the S phase occurs, the short circuit current I _FR of the R phase is generated in the R phase of the power transmission and distribution line as shown by the broken arrow in FIG. flow inside direction, but the short-circuit current I _FS of S phase to the S phase of the transmission and distribution lines to flow to the outside direction, the T-phase of the transmission and distribution lines does not flow a short-circuit current I _FT T-phase.
Accordingly, the short circuit current i _F1 outputted from the first straight through current transformer 10 ₁ to overcurrent relay 4 becomes the vector sum of the short-circuit current I _FS of the short circuit current I _FR and S phases of the R phase, the short circuit current i The amplitude of _F1 is “0”.
i _F1 = I _FR + I _FS = 0
| I _F1 | = | I _FR + I _FS | = 0
The short-circuit current i _F2 output from the second straight through current transformer 10 ₂ to the overcurrent relay 4 is an S-phase short-circuit current −I _FS having a negative polarity, and the short-circuit current i _{F2 has} an amplitude of S-phase. The amplitude of the short-circuit current _IFs .
i _F2 = −I _FS
| I _F2 | = | I _FS |
As a result, the short-circuit current I _Ry input from the differentially connected first and second straight through current transformers 10 ₁ and 10 ₂ to the overcurrent relay 4 has an S phase with a negative polarity as shown by the following equation: short-circuit current -I _FS next to the amplitude of the short-circuit current I _Ry is the amplitude of the short-circuit current I _FS of S phase (see FIG. 3 (a). in FIG. 3, a short circuit flow inside direction of transmission and distribution lines The currents I _FR , I _FS , and I _FT are indicated by solid arrows, and the short-circuit currents I _FR , I _FS , and I _FT flowing to the outside of the transmission and distribution lines are indicated by dashed-dotted arrows).
I _Ry = i _F1 + i _F2 = −I _FS
| I _Ry | = | I _FS |
(2) In the case of a short-circuit accident between the S phase and the T phase When a short circuit accident between the S phase and the T phase occurs, the S phase short circuit current I _FS flows in the S phase of the transmission and distribution line in the internal direction, and the T of the transmission and distribution line Although the T-phase short-circuit current I _FT flows in the external direction in the phase, the R-phase short-circuit current I _FR does not flow in the R-phase of the transmission and distribution line.
Accordingly, the short circuit current i _F1 outputted from the first straight through current transformer 10 ₁ to overcurrent relay 4 short-circuit current I _FS next to S phase, the short circuit current i _F1 amplitude of the short-circuit current I _FS of S-phase Amplitude.
i _F1 = I _FS
| I _F1 | = | I _FS |
Further, the short-circuit current i _F2 output from the second straight through current transformer 10 ₂ to the overcurrent relay 4 has the polarity of the vector sum of the S-phase short-circuit current I _FS and the T-phase short-circuit current I _FT reversed. As a result, the amplitude of the short-circuit current i _F2 becomes “0”.
i _F2 = − (I _FS + I _FT ) = 0
| I _F2 | = | I _FS + I _FT | = 0
As a result, the short-circuit current I _Ry input from the differentially connected first and second straight through current transformers 10 ₁ and 10 ₂ to the overcurrent relay 4 is the S-phase short-circuit current I as shown in the following equation. _FS , and the amplitude of the short-circuit current I _Ry becomes the amplitude of the S-phase short-circuit current I _FS (see FIG. 3B).
I _Ry = i _F1 + i _F2 = I _FS
| I _Ry | = | I _FS |
(3) In the case of a short circuit accident between the T phase and the R phase When a short circuit accident occurs between the T phase and the R phase, a T phase short circuit current I _FT flows in the T phase of the transmission and distribution line, and the R of the transmission and distribution line. While the short-circuit current I _FR of R-phase to phase flows to the outside direction, the S-phase of the transmission and distribution lines does not flow a short-circuit current I _FS of S phase.
Accordingly, the short circuit current i _F1 outputted from the first straight through current transformer 10 ₁ to overcurrent relay 4 short-circuit current I _FR next to R-phase, the short circuit current i _F1 amplitude of the short-circuit current I _FR of R-phase Amplitude.
i _F1 = I _FR
| I _F1 | = | I _FR |
The short-circuit current i _F2 output from the second straight through current transformer 10 ₂ to the overcurrent relay 4 is a T-phase short-circuit current −I _FT having a negative polarity, and the amplitude of the short-circuit current i _F2 is T-phase. The amplitude of the short-circuit current I _FT of
i _F2 = −I _FT
| I _F2 | = | I _FT |
As a result, the short-circuit current I _Ry input from the differentially connected first and second straight through current transformers 10 ₁ and 10 ₂ to the overcurrent relay 4 is the R-phase short-circuit current I as shown in the following equation. The vector difference between the _FR and the T-phase short-circuit current I _FT, and the amplitude of the short-circuit current I _Ry is twice the amplitude of the R-phase short-circuit current I _FR (T-phase short-circuit current I _FT ) (FIG. 3 (c) )reference).
I _Ry = i _F1 + i _F2 = I _FR −I _FT
| I _Ry | = | I _FR −I _FT | = 2 × | I _FR | = 2 × | I _FT |
(4) In the case of a short circuit accident between R phase, S phase, and T phase When a short circuit accident between R phase, S phase, and T phase occurs, short circuit current I of R phase to R phase, S phase, and T phase of the transmission and distribution line _FR and S-phase short-circuit current I _FS and T-phase short-circuit current I _FT flow in the internal direction with a phase difference of 120 °.
Accordingly, the short circuit current i _F1 outputted from the first straight through current transformer 10 ₁ to overcurrent relay 4 becomes the vector sum of the short-circuit current I _FS of the short circuit current I _FR and S phases of the R phase, the short circuit current i The amplitude of _{F1 is} the amplitude of the R-phase short-circuit current I _FR (S-phase short-circuit current I _FS ).
i _F1 = I _FR + I _FS
| I _F1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
Further, the short-circuit current i _F2 output from the second straight through current transformer 10 ₂ to the overcurrent relay 4 has the polarity of the vector sum of the S-phase short-circuit current I _FS and the T-phase short-circuit current I _FT reversed. The amplitude of the short-circuit current i _{F2 is} the amplitude of the S-phase short-circuit current I _FS (T-phase short-circuit current I _FT ).
i _F2 = − (I _FS + I _FT )
| I _F2 | = | I _FS + I _FT | = | I _FS | = | I _FT |
As a result, the short-circuit current I _Ry input from the differentially connected first and second straight through current transformers 10 ₁ and 10 ₂ to the overcurrent relay 4 is the R-phase short-circuit current I as shown in the following equation. The vector difference between the _FR and the T-phase short-circuit current I _FT, and the amplitude of the short-circuit current I _Ry is 3 ^1/2 times the amplitude of the R-phase short-circuit current I _FR (T-phase short-circuit current I _FT ). 3 (d)).
I _Ry = i _F1 + i _F2 = (I _FR + I _FS ) + {− (I _FS + I _FT )} = I _FR −I _FT
| I _Ry | = | I _FR −I _FT | = 3 ^1/2 × | I _FR | = 3 ^1/2 × | I _FT |

過電流継電器４は、短絡電流Ｉ_Ryの振幅が電流整定値を超えた場合には、送配電線に短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃を一括遮断する。 When the amplitude of the short circuit current I _Ry exceeds the current set value, the overcurrent relay 4 determines that a short circuit accident has occurred in the transmission and distribution lines, and the _first to _third circuit breakers 2 ₁ to 2 _3. Block all at once.

なお、送配電線のＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続したが、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよいし、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよい。 The second straight through current transformer to S phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and S-phase of the transmission and distribution lines are penetrating straight is penetrating straight vessel 10 ₂ and a have been connected, S-phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and T-phase of the transmission and distribution lines are penetrating straight is through straight The second straight through current transformer 10 ₂ may be differentially connected, or the first straight through current transformer 10 _{1 in} which the R-phase and T-phase of the transmission / distribution line are penetrated straight and the transmission / distribution line. The second straight through current transformer 10 _{2 in} which the R phase and the S phase are straightly penetrated may be differentially connected.

次に、本発明の第２の実施例による保護継電装置について、図４を参照して説明する。
本実施例による保護継電装置は、図４に示すように、変圧器５の１次側に設置された第１のストレート貫通変流器１０₁と、変圧器５の１次側に設置された、かつ、第１のストレート貫通変流器１０₁と差接続された第２のストレート貫通変流器１０₂と、変圧器５の２次側に設置された第３のストレート貫通変流器１０₃と、変圧器５の２次側に設置された、かつ、第３のストレート貫通変流器１０₃と差接続された第４のストレート貫通変流器１０₄と、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流との差電流（以下、「短絡電流Ｉ_Ry」と称する。）に基づいて変圧器５内部の短絡事故を検出すると、変圧器５の１次側のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と変圧器５の２次側のＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とを一括遮断する電流差動継電器２０とを具備する。 Next, a protective relay device according to a second embodiment of the present invention will be described with reference to FIG.
Protective relay apparatus according to this embodiment, as shown in FIG. 4, a first straight through current transformer 10 ₁ installed on the primary side of the transformer 5 is installed on the primary side of the transformer 5 was, and, second the straight through-current transformer 10, _second and third straight through current transformer installed in the secondary side of the transformer 5, which is a first straight through current transformer 10 ₁ and connected 10 ₃ and a fourth straight through current transformer 10 ₄ installed on the secondary side of the transformer 5 and differentially connected to the third straight through current transformer 10 ₃ . The short-circuit current input from the first and second straight through current transformers 10 ₁ and 10 ₂ and the short-circuit current input from the third and fourth straight through current transformers 10 ₃ and 10 ₄ connected in a differential manner differential current (hereinafter. referred to as "short-circuit current I _Ry") for detecting the transformer 5 internal short-circuit fault on the basis of , The primary side of the R phase of the transformer 5, S-phase and T-phase to the first to third circuit breaker 2 ₁ to 2 ₃ and the secondary side of the R-phase transformer 5 disposed respectively, S-phase and And a current differential relay 20 that collectively disconnects the _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ respectively installed in the T phase.

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に変圧器５の１次側のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に変圧器５の１次側のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に変圧器５の２次側のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に変圧器５の２次側のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、変圧器５の１次側のＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、変圧器５の１次側のＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、変圧器５の２次側のＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、変圧器５の２次側のＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の環状鉄心の極性方向に貫通されている。
また、第２のストレート貫通変流器１０₂は、第２のストレート貫通変流器１０₂から電流差動継電器２０に出力される短絡電流の極性が第１のストレート貫通変流器１０₁から電流差動継電器２０に出力される短絡電流の極性の逆となるように、電流差動継電器２０と接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から電流差動継電器２０に出力される短絡電流の極性が第３のストレート貫通変流器１０₃から電流差動継電器２０に出力される短絡電流の極性の逆となるように、電流差動継電器２０と接続されている。
さらに、差接続された第３および第４のストレート貫通変流器１０₃，１０₃は、差接続された第３および第４のストレート貫通変流器１０₃，１０₃から電流差動継電器２０に入力される短絡電流の極性が差接続された第１および第２のストレート貫通変流器１０₁，１０₂から電流差動継電器２０に入力される短絡電流の極性と逆となるように、電流差動継電器２０に接続されている。 The first straight through current transformer 10 _1, the secondary coil of the transformer 5 to an annular core formed by winding a primary side of the R-phase and S-phase feedthrough variable which is passed through straight in the same direction The second straight through current transformer 10 ₂ is a through which has the S-phase and T-phase on the primary side of the transformer 5 straightly penetrated in the same direction in the annular core wound with the secondary coil. The third straight through current transformer 10 ₃ is configured to allow the R-phase and S-phase on the secondary side of the transformer 5 to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S-phase and T-phase on the secondary side of the transformer 5 in the same direction on the annular core around which the secondary coil is wound. This is a through-type current transformer.
That is, the primary side of the R-phase and S-phase of the transformer 5 are both through the first straight through current transformer 10 _first polarity direction, S-phase and T-phase of the primary side of the transformer 5 Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase on the secondary side of the transformer 5 penetrate in the polarity direction of the third straight through current transformer 10 _3. The S phase and the T phase on the secondary side of the transformer 5 are both penetrated in the polarity direction of the annular core of the fourth straight through current transformer 10 ₄ .
In addition, the second straight through current transformer 10 ₂ has a short-circuit current output from the second straight through current transformer 10 ₂ to the current differential relay 20 with the polarity from the first straight through current transformer 10 _1. The current differential relay 20 is connected so that the polarity of the short-circuit current output to the current differential relay 20 is reversed. Similarly, in the fourth straight through current transformer 10 ₄ , the polarity of the short-circuit current output from the fourth straight through current transformer 10 ₄ to the current differential relay 20 is the third straight through current transformer 10 _3. Is connected to the current differential relay 20 so that the polarity of the short-circuit current output to the current differential relay 20 is reversed.
Furthermore, the differentially connected third and fourth straight through current transformers 10 ₃ and 10 ₃ are connected to the current differential relay 20 from the differentially connected third and fourth straight through current transformers 10 ₃ and 10 _3. So that the polarity of the short circuit current input to the current differential relay 20 is reversed from the polarity of the first and second straight through current transformers 10 ₁ and 10 _{2 connected} to each other. The current differential relay 20 is connected.

したがって、短絡事故が発生していないときに変圧器５の１次側（送電端）のＲ相、Ｓ相およびＴ相に流れる１次負荷電流をＩ_1R，Ｉ_1S，Ｉ_1Tで表し、変圧器５の２次側（受電端）のＲ相、Ｓ相およびＴ相に流れる２次負荷電流をＩ_2R，Ｉ_2S，Ｉ_2Tで表すと、Ｒ相の１次負荷電流Ｉ_1RとＳ相の１次負荷電流Ｉ_1Sとは１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れ、Ｒ相の２次負荷電流Ｉ_2RとＳ相の２次負荷電流Ｉ_2Sとは１２０°の位相差で第３のストレート貫通変流器１０₃の環状鉄心を極性方向に貫通して流れる（図２参照）。また、Ｓ相の１次負荷電流Ｉ_1SとＴ相の１次負荷電流Ｉ_1Tとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れ、Ｓ相の２次負荷電流Ｉ_2SとＴ相の２次負荷電流Ｉ_2Tとは１２０°の位相差で第４のストレート貫通変流器１０₄の環状鉄心を極性方向に貫通して流れる（図２参照）。
そのため、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から電流差動継電器２０に入力される１次負荷電流ｉ₁は、上述した第１の実施例による過電流継電器４における場合と同様にして、Ｒ相の１次負荷電流Ｉ_1RとＴ相の１次負荷電流Ｉ_1Tとのベクトル差となり、１次負荷電流ｉ₁の振幅はＲ相の１次負荷電流Ｉ_1R（Ｔ相の１次負荷電流Ｉ_1T）の振幅の３^1/2倍となる。
ｉ₁＝Ｉ_1R−Ｉ_1T
｜ｉ₁｜＝｜Ｉ_1R−Ｉ_1T｜＝３^1/2×｜Ｉ_1R｜＝３^1/2×｜Ｉ_1T｜
同様に、差接続された第３および第４のストレート貫通変流器１０₃，１０₄から電流差動継電器２０に入力される２次負荷電流ｉ₂はＲ相の２次負荷電流Ｉ_2RとＴ相の２次負荷電流Ｉ_2Tとのベクトル差（極性は負）となり、２次負荷電流ｉ₂の振幅はＲ相の２次負荷電流Ｉ_2R（Ｔ相の２次負荷電流Ｉ_2T）の振幅の３^1/2倍となる。
ｉ₂＝−（Ｉ_2R−Ｉ_2T）
｜ｉ₂｜＝｜Ｉ_2R−Ｉ_2T｜＝３^1/2×｜Ｉ_2R｜＝３^1/2×｜Ｉ_2T｜
その結果、電流差動継電器２０に入力される負荷電流Ｉは、１次負荷電流ｉ₁と２次負荷電流ｉ₂とのベクトル和で表され、負荷電流Ｉの振幅は“０”（｜Ｉ｜＝｜ｉ₁＋ｉ₂｜＝０）となる。 Therefore, the primary load currents flowing in the R-phase, S-phase, and T-phase on the primary side (transmission end) of the transformer 5 when no short-circuit accident has occurred are represented by I _1R , I _1S , I _1T When the secondary load currents flowing in the R phase, S phase, and T phase on the secondary side (power receiving end) of the device 5 are expressed by I _2R , I _2S , I _2T , the R phase primary load current I _1R and the S phase The primary load current I _1S of the first straight through current transformer 10 ₁ flows in the polarity direction with a phase difference of 120 ° and flows in the polar direction. The R-phase secondary load current I _2R and the S-phase It flows through the annular core of the third straight through current transformer 10 _{3 in} the polarity direction with a phase difference of 120 ° from the secondary load current I _2S (see FIG. 2). The S-phase primary load current I _1S and the T-phase primary load current I _1T flow through the annular core of the second straight through current transformer 10 _{2 in} the polarity direction with a phase difference of 120 °. The S-phase secondary load current I _2S and the T-phase secondary load current I _2T flow through the annular core of the fourth straight through current transformer 10 _{4 in} the polarity direction with a phase difference of 120 ° ( (See FIG. 2).
Therefore, the primary load current i ₁ input to the current differential relay 20 from the first and second straight through current transformers 10 ₁ and 10 ₂ connected by difference is the overcurrent according to the first embodiment described above. In the same manner as in the relay 4, the vector difference between the R-phase primary load current I _1R and the T-phase primary load current I _1T becomes the amplitude of the primary load current i _1. It becomes 3 ^1/2 times the amplitude of I _1R (T-phase primary load current I _1T ).
i ₁ = I _1R −I _1T
| I ₁ | = | I _1R −I _1T | = 3 ^1/2 × | I _1R | = 3 ^1/2 × | I _1T |
Similarly, the secondary load current i ₂ input to the current differential relay 20 from the differentially connected third and fourth straight through current transformers 10 ₃ and 10 ₄ is the R-phase secondary load current I _2R . It becomes a vector difference (polarity is negative) from the T-phase secondary load current I _2T, and the amplitude of the secondary load current i ₂ is the R-phase secondary load current I _2R (T-phase secondary load current I _2T ). 3 ^1/2 times the amplitude.
i ₂ = − (I _2R −I _2T )
| I ₂ | = | I _2R −I _2T | = 3 ^1/2 × | I _2R | = 3 ^1/2 × | I _2T |
As a result, the load current I input to the current differential relay 20 is represented by a vector sum of the primary load current i ₁ and the secondary load current i _2, and the amplitude of the load current I is “0” (| I | = | I ₁ + i ₂ | = 0).

また、たとえば変圧器５内部の１次側において短絡事故が発生したときに変圧器５の１次側の送配電線のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、短絡電流Ｉ_Ry（差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流との差電流）は、上述した第１の実施例による過電流継電器４における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry＝−Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝２×｜Ｉ_FR｜＝２×｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝３^1/2×｜Ｉ_FR｜＝３^1/2×｜Ｉ_FT｜ Further, for example, when a short circuit accident occurs on the primary side inside the transformer 5, short circuit currents flowing in the R phase, S phase, and T phase of the primary transmission and distribution line of the transformer 5 are represented by I _FR , I _FS , When expressed by I _FT , the short-circuit current I _Ry (the third and fourth straight throughs that are differentially connected to the short-circuit currents input from the first and second straight through current transformers 10 ₁ and 10 ₂ that are differentially connected. The difference current from the short-circuit current input from the current transformers 10 ₃ and 10 ₄ is expressed as follows according to the accident aspect in the same manner as in the overcurrent relay 4 according to the first embodiment described above. Is done.
(1) In case of short circuit between R phase and S phase I _Ry = -I _FS
| I _Ry | = | I _FS |
(2) In case of short-circuit accident between S phase and T phase I _Ry = I _FS
| I _Ry | = | I _FS |
(3) In case of short-circuit accident between T phase and R phase I _Ry = I _FR -I _FT
| I _Ry | = 2 × | I _FR | = 2 × | I _FT |
(4) In the case of a short-circuit between R-phase, S-phase and T-phase I _Ry = I _FR -I _FT
| I _Ry | = 3 ^1/2 × | I _FR | = 3 ^1/2 × | I _FT |

電流差動継電器２０は、短絡電流Ｉ_Ryの振幅が電流整定値を超えた場合には、変圧器５内部において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 Current differential relay 20, when the amplitude of the short-circuit current I _Ry exceeds the current setting value, it is determined that the short-circuit failure occurs inside the transformer 5, the circuit breaker 2 ₁ of the first to sixth Block ₆ and ₆ together.

なお、変圧器５の１次側のＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続したが、変圧器５の１次側のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよいし、変圧器５の１次側のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよい。
第３および第４のストレート貫通変流器１０₃，１０₄についても同様である。 Incidentally, S-phase and T-phase of the primary side first straight through current transformer 10 ₁ a transformer 5 to R-phase and S-phase of the primary side of the transformer 5 is penetrating straight is through straight The second straight through current transformer 10 ₂ is connected to the second straight through current transformer 10 ₂ , but the first straight through current transformer 10 _{1 in} which the R phase and T phase on the primary side of the transformer 5 are straight through and the transformer. 5 may be connected to the second straight through current transformer 10 _{2 in} which the S phase and the T phase on the primary side are straightly passed, or the R phase and the T phase on the primary side of the transformer 5. The first straight through current transformer 10 ₁ through which is straightly penetrated and the second straight through current transformer 10 ₂ through which the R phase and S phase on the primary side of the transformer 5 are straight through are differentially connected. May be.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ .

次に、本発明の第３の実施例による保護継電装置について、図５を参照して説明する。
本実施例による保護継電装置は、構内における短絡事故から第１および第２の送配電線１Ｌ，２Ｌを保護するための受電保護継電装置であり、図５に示すように、第１の送配電線１Ｌに設置された第１のストレート貫通変流器１０₁と、第１の送配電線１Ｌに設置された、かつ、第１のストレート貫通変流器１０₁と差接続された第２のストレート貫通変流器１０₂と、第２の送配電線２Ｌに設置された第３のストレート貫通変流器１０₃と、第２の送配電線２Ｌに設置された、かつ、第３のストレート貫通変流器１０₃と差接続された第４のストレート貫通変流器１０₄と、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流の和電流（以下、「短絡電流Ｉ_Ry」と称する。）に基づいて構内での短絡事故を検出すると、第１の送配電線１ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と第２の送配電線２ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とを一括遮断する過電流継電器３０とを具備する。 Next, a protective relay device according to a third embodiment of the present invention will be described with reference to FIG.
The protection relay device according to the present embodiment is a power reception protection relay device for protecting the first and second transmission / distribution lines 1L and 2L from a short circuit accident in the premises. As shown in FIG. The first straight through current transformer 10 ₁ installed in the transmission and distribution line 1L and the first straight through current transformer 10 ₁ installed in the first transmission and distribution line 1L and differentially connected to the first straight through current transformer 10 ₁ . Two straight through current transformers 10 ₂ , a third straight through current transformer 10 ₃ installed in the second transmission / distribution line 2L, a _third transmission line / distribution line 2L, and a third straight through the current transformer 10 ₃ and the fourth straight through current transformer ₁₀₄ which is connected, first and second straight through current transformer 10 _1, short-circuit input 10 ₂ which is connected to Input from the third and fourth straight through current transformers 10 ₃ and 10 ₄ connected to the current difference When a short-circuit _fault is detected on the premises based on the sum of the short-circuit currents that are applied (hereinafter referred to as “short-circuit current I _Ry ”), _First to _third circuit breakers 2 ₁ to 2 ₃ installed respectively and _fourth to sixth circuit breakers 2 ₄ to 6 installed respectively in the R phase, S phase and T phase of the second transmission and distribution line 2L And an overcurrent relay 30 that collectively cuts off the power supply ₂₆ .

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、第１の送配電線１ＬのＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、第１の送配電線１ＬのＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、第２の送配電線２ＬのＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、第２の送配電線２ＬのＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の極性方向に貫通されている。
また、第２のストレート貫通変流器１０₂は、第２のストレート貫通変流器１０₂から過電流継電器３０に出力される短絡電流の極性が第１のストレート貫通変流器１０₁から過電流継電器３０に出力される短絡電流の極性の逆となるように、過電流継電器３０と接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から過電流継電器３０に出力される短絡電流の極性が第３のストレート貫通変流器１０₃から過電流継電器３０に出力される短絡電流の極性の逆となるように、過電流継電器３０と接続されている。 The first straight through current transformer 10 _1, the first transmission and distribution lines 1L R phase and S phase through type variable that is passed through straight in the same direction of the secondary coil in an annular core formed by winding a flow device, a second straight through current transformer 10 ₂ has a circular core formed by winding a secondary coil is passed through the S-phase and T-phase of the first transmission and distribution lines 1L straight in the same direction through The third straight through current transformer 10 ₃ allows the R-phase and S-phase of the second power transmission and distribution line 2L to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S phase and the T phase of the second power transmission / distribution line 2L in the same direction around the annular core wound with the secondary coil. This is a penetrating through-type current transformer.
Ie, R-phase and S-phase of the first transmission and distribution lines 1L are both through the first polarity direction straight through current transformer 10 _1, S-phase and T-phase of the first transmission and distribution lines. 1L Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase of the second transmission and distribution line 2L penetrate in the polarity direction of the third straight through current transformer 10 _3. The S phase and the T phase of the second transmission / distribution line 2L are both penetrated in the polarity direction of the fourth straight through current transformer 10 ₄ .
The second straight through current transformer 10 _2, the polarity of the short circuit current output from the second straight through current transformer 10 ₂ to overcurrent relay 30 is over the first straight through current transformer 10 ₁ The overcurrent relay 30 is connected so that the polarity of the short-circuit current output to the current relay 30 is reversed. Similarly, the fourth straight through current transformer 10 ₄ has a polarity of the short-circuit current output from the fourth straight through current transformer 10 ₄ to the overcurrent relay 30 from the third straight through current transformer 10 _3. The overcurrent relay 30 is connected so that the polarity of the short-circuit current output to the overcurrent relay 30 is reversed.

したがって、構内において短絡事故が発生していないときに第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、Ｒ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとは１２０°の位相差で第１および第３のストレート貫通変流器１０₁，１０₃の環状鉄心を極性方向に貫通して流れ、Ｓ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとは１２０°の位相差で第２および第４のストレート貫通変流器１０₂，１０₄の環状鉄心を極性方向に貫通して流れる（図２参照）。そのため、差接続された第１および第２のストレート貫通変流器１０₁，１０₂と差接続された第３および第４のストレート貫通変流器１０₃，１０₄とから過電流継電器３０に入力される負荷電流Ｉは、上述した第１の実施例による過電流継電器４における場合と同様にして、Ｒ相の負荷電流Ｉ_RとＴ相の負荷電流Ｉ_Tとのベクトル差となり、負荷電流Ｉの振幅はＲ相の負荷電流Ｉ_R（Ｔ相の負荷電流Ｉ_T）の振幅の３^1/2倍となる。
Ｉ＝Ｉ_R−Ｉ_T
｜Ｉ｜＝｜Ｉ_R−Ｉ_T｜＝３^1/2×｜Ｉ_R｜＝３^1/2×｜Ｉ_T｜ Therefore, when the short-circuit accident does not occur on the premises, the load currents flowing in the R-phase, S-phase, and T-phase of the first and second transmission / distribution lines 1L, 2L are represented by I _R , I _S , I _T. The R-phase load current I _R and the S-phase load current I _S pass through the annular cores of the first and third straight through current transformers 10 ₁ and 10 _{3 in} the polar direction with a phase difference of 120 °. The S-phase load current I _S and the T-phase load current I _T pass through the annular cores of the second and fourth straight through current transformers 10 ₂ and 10 _{4 in} the polar direction with a phase difference of 120 °. (See FIG. 2). Therefore, the first and second straight through current transformers 10 ₁ and 10 ₂ connected to each other are connected to the overcurrent relay 30 from the third and fourth straight through current transformers 10 ₃ and 10 ₄ connected to each other. The input load current I is the vector difference between the R-phase load current I _R and the T-phase load current I _T in the same manner as in the overcurrent relay 4 according to the first embodiment described above. The amplitude of I is 3 ^1/2 times the amplitude of the R-phase load current I _R (T-phase load current I _T ).
I = I _R −I _T
| I | = | I _R −I _T | = 3 ^1/2 × | I _R | = 3 ^1/2 × | I _T |

また、構内において短絡事故が発生したときに第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、短絡電流Ｉ_Ry（差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流との和電流）は、上述した第１の実施例による過電流継電器４における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry＝−Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝２×｜Ｉ_FR｜＝２×｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝３^1/2×｜Ｉ_FR｜＝３^1/2×｜Ｉ_FT｜ In addition, when a short-circuit accident occurs on the premises, the short-circuit currents flowing in the R-phase, S-phase, and T-phase of the first and second power transmission lines 1L, 2L are expressed as I _FR , I _FS , I _FT Current I _Ry (third and fourth straight through current transformers 10 ₃ , 10 differentially connected to the short-circuit current input from the first and second straight through current transformers 10 ₁ , 10 ₂ connected to each other The sum current with the short-circuit current input from ₄ ) is expressed as follows according to the accident aspect, similarly to the case of the overcurrent relay 4 according to the first embodiment described above.
(1) In case of short circuit between R phase and S phase I _Ry = -I _FS
| I _Ry | = | I _FS |
(2) In case of short-circuit accident between S phase and T phase I _Ry = I _FS
| I _Ry | = | I _FS |
(3) In case of short-circuit accident between T phase and R phase I _Ry = I _FR -I _FT
| I _Ry | = 2 × | I _FR | = 2 × | I _FT |
(4) In the case of a short-circuit between R-phase, S-phase and T-phase I _Ry = I _FR -I _FT
| I _Ry | = 3 ^1/2 × | I _FR | = 3 ^1/2 × | I _FT |

過電流継電器３０は、短絡電流Ｉ_Ryの振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 When the amplitude of the short-circuit current _IRy exceeds the current set value, the overcurrent relay 30 determines that a short-circuit accident has occurred in the premises and collects the _first to _sixth circuit breakers 2 ₁ to 2 ₆ at _once. Cut off.

なお、第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続したが、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよいし、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよい。
第３および第４のストレート貫通変流器１０₃，１０₄についても同様である。 Incidentally, S-phase and T-phase of the first transmission and distribution lines 1L of R phase and the first straight through current transformer 10 ₁ in the first transmission and distribution lines 1L of S phase is penetrating straight is through straight The first straight through current transformer 10 ₁ and the first straight through current transformer 10 _{1 in} which the R phase and the T phase of the first transmission / distribution line 1L are straightly penetrated are connected to the second straight through current transformer 10 ₂ . transmission and distribution lines 1L S-phase and T-phase and the second straight through current transformer 10 ₂ that penetrate straight may be connected in, R-phase and T-phase of the first transmission and distribution lines 1L The first straight through current transformer 10 ₁ through which is straightly penetrated and the second straight through current transformer 10 ₂ through which the R phase and S phase of the first transmission / distribution line 1L are straight through are differentially connected. May be.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ .

次に、本発明の第４の実施例による保護継電装置について、図６を参照して説明する。
本実施例による保護継電装置は、構内における短絡事故から第１および第２の送配電線１Ｌ，２Ｌを保護するための分割受電保護継電装置であり、図６に示すように、第１の母線から分岐された第１の送配電線１Ｌに設置された第１のストレート貫通変流器１０₁と、第１の送配電線１Ｌに設置された、かつ、第１のストレート貫通変流器１０₁と差接続された第２のストレート貫通変流器１０₂と、第２の母線から分岐された第２の送配電線２Ｌに設置された第３のストレート貫通変流器１０₃と、第２の送配電線２Ｌに設置された、かつ、第３のストレート貫通変流器１０₃と差接続された第４のストレート貫通変流器１０₄と、第１の母線に設置された第５のストレート貫通変流器１０₅と、第１の母線に設置された、かつ、第５のストレート貫通変流器１０₅と差接続された第６のストレート貫通変流器１０₆と、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第５および第６のストレート貫通変流器１０₅，１０₆から入力される短絡電流との差電流（以下、「短絡電流Ｉ_Ry」と称する。）に基づいて構内での短絡事故を検出すると、第１の送配電線１ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と第１および第２の母線のＲ相、Ｓ相およびＴ相の間にそれぞれ設置された第７乃至第９の遮断器２₇〜２₉（母線連絡遮断器）とを一括遮断する第１の過電流継電器４０₁と、差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流と差接続された第５および第６のストレート貫通変流器１０₅，１０₆から入力される短絡電流との差電流（以下、「短絡電流Ｉ_Ry」と称する。）に基づいて構内での短絡事故を検出すると、第２の送配電線２ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆と第７乃至第９の遮断器２₇〜２₉とを一括遮断する第２の過電流継電器４０₂とを具備する。 Next, a protective relay device according to a fourth embodiment of the present invention will be described with reference to FIG.
The protective relay device according to the present embodiment is a split power receiving protective relay device for protecting the first and second power transmission / distribution lines 1L and 2L from a short circuit accident on the premises. As shown in FIG. first and straight through current transformer 10 ₁ installed in the first transmission and distribution lines 1L which is branched from the bus, and installed in the first transmission and distribution lines 1L, and a first straight through current transformer A second straight through current transformer 10 ₂ differentially connected to the device 10 _1, and a third straight through current transformer 10 ₃ installed in the second transmission / distribution line 2L branched from the second bus. The fourth straight through current transformer 10 ₄ installed on the second power transmission / distribution line 2L and connected to the third straight through current transformer 10 ₃ by differential connection, and the first bus bar. a straight through current transformer ₁₀₅ of the fifth, installed in the first busbar, and, fifth stress A straight through current transformer ₁₀₆ of the sixth which is collected by the through current transformer ₁₀₅ and is connected, a difference connected first and second straight through current transformer 10 _1, 10 ₂ short-circuit current which is input from the And the short-circuit current input from the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ connected to each other (hereinafter referred to as “short-circuit current I _Ry ”). When a short circuit accident is detected, the _first to _third circuit breakers 2 ₁ to 2 ₃ installed in the R phase, S phase and T phase of the first transmission and distribution line 1L and the Rs of the first and second buses A first overcurrent relay 40 ₁ that collectively cuts off the _seventh to _ninth circuit breakers 2 ₇ to 2 ₉ (bus connection breakers) installed between the phase, the S phase, and the T phase, respectively, and a differential connection The third and fourth straight through current transformers 10 ₃ and 10 ₄ connected to the short-circuit current are connected to be differentially connected. In addition, a short-circuit accident in the premises is detected based on a difference current from the short-circuit current input from the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ (hereinafter referred to as “short-circuit current I _Ry ”). Then, the _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ and the _seventh to _ninth circuit breakers 2 ₇ to 2 ₉ installed in the R phase, S phase, and T phase of the second transmission and distribution line 2L, respectively. comprising a second overcurrent relay 40 ₂ for collectively blocking and.

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第５のストレート貫通変流器１０₅は、２次コイルを巻装した環状鉄心に第１の母線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第６のストレート貫通変流器１０₆は、２次コイルを巻装した環状鉄心に第１の母線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、第１の送配電線１ＬのＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、第１の送配電線１ＬのＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、第２の送配電線２ＬのＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、第２の送配電線２ＬのＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の極性方向に貫通されており、第１の母線のＲ相およびＳ相はともに第５のストレート貫通変流器１０₅の極性方向に貫通されており、第１の母線のＳ相およびＴ相はともに第６のストレート貫通変流器１０₆の極性方向に貫通されている。
また、第２のストレート貫通変流器１０₂は、第２のストレート貫通変流器１０₂から第１の過電流継電器４０₁に出力される短絡電流の極性が第１のストレート貫通変流器１０₁から第１の過電流継電器４０₁に出力される短絡電流の極性の逆となるように、第１の過電流継電器４０₁と接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から第２の過電流継電器４０₂に出力される短絡電流の極性が第３のストレート貫通変流器１０₃から第２の過電流継電器４０₂に出力される短絡電流の極性の逆となるように、第２の過電流継電器４０₂と接続されており、また、第６のストレート貫通変流器１０₆は、第５のストレート貫通変流器１０₅から第１および第２の過電流継電器４０₁，４０₂に出力される短絡電流の極性が第６のストレート貫通変流器１０₆から第１および第２の過電流継電器４０₁，４０₂に出力される短絡電流の極性の逆となるように、第１および第２の過電流継電器４０₁，４０₂と接続されている。 The first straight through current transformer 10 _1, the first transmission and distribution lines 1L R phase and S phase through type variable that is passed through straight in the same direction of the secondary coil in an annular core formed by winding a flow device, a second straight through current transformer 10 ₂ has a circular core formed by winding a secondary coil is passed through the S-phase and T-phase of the first transmission and distribution lines 1L straight in the same direction through The third straight through current transformer 10 ₃ allows the R-phase and S-phase of the second power transmission and distribution line 2L to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S phase and the T phase of the second power transmission / distribution line 2L in the same direction around the annular core wound with the secondary coil. The fifth straight through current transformer 10 ₅ is a secondary coil. Is a through-type current transformer in which the R-phase and S-phase of the first bus are straightly penetrated in the same direction through a ring-shaped iron core wound with a 6-straight through-current transformer 10 _6. This is a through-type current transformer in which an S-phase and a T-phase of a first bus bar are straightly penetrated in the same direction through a wound annular iron core.
Ie, R-phase and S-phase of the first transmission and distribution lines 1L are both through the first polarity direction straight through current transformer 10 _1, S-phase and T-phase of the first transmission and distribution lines. 1L Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase of the second transmission and distribution line 2L penetrate in the polarity direction of the third straight through current transformer 10 _3. are, S-phase and T-phase of the second transmission and distribution lines 2L are both through to the fourth straight through current transformer ₁₀₄ polarity direction, R-phase and S-phase of the first busbar together The fifth straight through current transformer 10 ₅ is penetrated in the polarity direction, and the S phase and the T phase of the first bus are both penetrated in the polar direction of the sixth straight through current transformer 10 ₆ .
Further, the second straight through current transformer 10 ₂ has a first straight through current transformer in which the polarity of the short-circuit current output from the _second straight through current transformer 10 ₂ to the first overcurrent relay 40 ₁ is the same. The first overcurrent relay 40 ₁ is connected so that the polarity of the short-circuit current output from 10 ₁ to the first overcurrent relay 40 ₁ is reversed. Similarly, in the fourth straight through current transformer 10 ₄ , the polarity of the short-circuit current output from the _fourth straight through current transformer 10 ₄ to the second overcurrent relay 40 ₂ is the third straight through current transformer. Connected to the second overcurrent relay 40 ₂ so that the polarity of the short-circuit current output from the capacitor 10 ₃ to the second overcurrent relay 40 ₂ is reversed, and the sixth straight through current transformer vessel ₁₀₆ from the fifth straight through current transformer ₁₀₅ of the first and second overcurrent relay 40 _1, 40 the polarity of the short circuit current output ₂ to a straight through current transformer ₁₀₆ of the sixth The first and second overcurrent relays 40 ₁ and 40 ₂ are connected so that the polarity of the short circuit current output to the first and second overcurrent relays 40 ₁ and 40 ₂ is opposite.

したがって、構内において短絡事故が発生していないときに第１および第２の母線と第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、Ｒ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとは１２０°の位相差で第１、第３および第５のストレート貫通変流器１０₁，１０₃，１０₅の環状鉄心を極性方向に貫通して流れ、Ｓ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとは１２０°の位相差で第２、第４および第６のストレート貫通変流器１０₂，１０₄，１０₆の環状鉄心を極性方向に貫通して流れる（図２参照）。そのため、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から第１の過電流継電器４０₁に入力される負荷電流Ｉと、差接続された第３および第４のストレート貫通変流器１０₃，１０₄から第２の過電流継電器３０₂に入力される負荷電流Ｉと、差接続された第５および第６のストレート貫通変流器１０₅，１０₆から第１および第２の過電流継電器３０₁，３０₂に入力される負荷電流Ｉとは、上述した第１の実施例による過電流継電器４における場合と同様にして、Ｒ相の負荷電流Ｉ_RとＴ相の負荷電流Ｉ_Tとのベクトル差となり、負荷電流Ｉの振幅はＲ相の負荷電流Ｉ_R（Ｔ相の負荷電流Ｉ_T）の振幅の３^1/2倍となる。
Ｉ＝Ｉ_R−Ｉ_T
｜Ｉ｜＝｜Ｉ_R−Ｉ_T｜＝３^1/2×｜Ｉ_R｜＝３^1/2×｜Ｉ_T｜ Therefore, when no short circuit accident occurs on the premises, the load currents flowing in the R phase, S phase, and T phase of the first and second buses and the first and second transmission / distribution lines 1L, 2L are represented by I _R , Expressed as I _S and I _T , the R-phase load current I _R and the S-phase load current I _S have a phase difference of 120 °, and the first, third, and fifth straight through current transformers 10 ₁ , 10 ₃ and 10 _{5 through} the annular core in the polarity direction, the S-phase load current I _S and the T-phase load current I _T are 120 ° out of phase with the second, fourth and sixth straight throughs. It flows through the annular cores of the current transformers 10 ₂ , 10 ₄ , 10 _{6 in} the polar direction (see FIG. 2). Therefore, the load current I input from the differentially connected first and second straight through current transformers 10 ₁ and 10 ₂ to the first overcurrent relay 40 ₁ and the differentially connected third and fourth The load current I input to the second overcurrent relay 30 ₂ from the straight through current transformers 10 ₃ and 10 ₄ and the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ connected to each other are connected to the load current I to be input first and second overcurrent relay 30 _1, 30 _2, in the same manner as in the first overcurrent relay 4 in accordance with embodiments of the above, the load current I _R of the R-phase It becomes a vector difference from the T-phase load current I _T, and the amplitude of the load current I is 3 ^1/2 times the amplitude of the R-phase load current I _R (T-phase load current I _T ).
I = I _R −I _T
| I | = | I _R −I _T | = 3 ^1/2 × | I _R | = 3 ^1/2 × | I _T |

また、構内において短絡事故が発生したときに第１および第２の母線と第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、短絡電流Ｉ_Ry（差接続された第１および第２のストレート貫通変流器１０₁，１０₂から入力される短絡電流と差接続された第５および第６のストレート貫通変流器１０₅，１０₆から入力される短絡電流との差電流、および差接続された第３および第４のストレート貫通変流器１０₃，１０₄から入力される短絡電流と差接続された第５および第６のストレート貫通変流器１０₅，１０₆から入力される短絡電流との差電流）は、上述した第１の実施例による過電流継電器４における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry＝−Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝２×｜Ｉ_FR｜＝２×｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝３^1/2×｜Ｉ_FR｜＝３^1/2×｜Ｉ_FT｜ Further, when a short circuit accident occurs on the premises, the short circuit currents flowing in the R phase, S phase and T phase of the first and second buses and the first and second transmission and distribution lines 1L and 2L are represented by I _FR and I _FS. , I _FT , the short-circuit current I _Ry (the fifth and sixth straights differentially connected to the short-circuit current input from the first and second straight through current transformers 10 ₁ and 10 ₂ connected differentially. Difference connection with short-circuit current input from through current transformers 10 ₅ and 10 ₆ , and short-circuit current input from third and fourth straight through current transformers 10 ₃ and 10 ₄ connected by difference connection The difference between the short-circuit current input from the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ ) is the same as in the overcurrent relay 4 according to the first embodiment described above, It is expressed as follows according to the accident aspect.
(1) In case of short circuit between R phase and S phase I _Ry = -I _FS
| I _Ry | = | I _FS |
(2) In case of short-circuit accident between S phase and T phase I _Ry = I _FS
| I _Ry | = | I _FS |
(3) In case of short-circuit accident between T phase and R phase I _Ry = I _FR -I _FT
| I _Ry | = 2 × | I _FR | = 2 × | I _FT |
(4) In the case of a short-circuit between R-phase, S-phase and T-phase I _Ry = I _FR -I _FT
| I _Ry | = 3 ^1/2 × | I _FR | = 3 ^1/2 × | I _FT |

第１の過電流継電器４０₁は、短絡電流Ｉ_Ryの振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃と第７乃至第９の遮断器２₇〜２₉とを一括遮断する。
第２の過電流継電器４０₂についても同様である。 When the amplitude of the short circuit current I _Ry exceeds the current set value, the first overcurrent relay 40 ₁ determines that a short circuit accident has occurred on the premises, and the first to third circuit breakers 2 ₁ to 3 2 ₃ and the seventh to _ninth circuit breakers 2 ₇ to 29 are collectively cut off.
The same applies to the second over current relay 40 _2.

なお、第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続したが、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよいし、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよい。
第３および第４のストレート貫通変流器１０₃，１０₄と第５および第６のストレート貫通変流器１０₅，１０₆とについても同様である。 Incidentally, S-phase and T-phase of the first transmission and distribution lines 1L of R phase and the first straight through current transformer 10 ₁ in the first transmission and distribution lines 1L of S phase is penetrating straight is through straight The first straight through current transformer 10 ₁ and the first straight through current transformer 10 _{1 in} which the R phase and the T phase of the first transmission / distribution line 1L are straightly penetrated are connected to the second straight through current transformer 10 ₂ . transmission and distribution lines 1L S-phase and T-phase and the second straight through current transformer 10 ₂ that penetrate straight may be connected in, R-phase and T-phase of the first transmission and distribution lines 1L The first straight through current transformer 10 ₁ through which is straightly penetrated and the second straight through current transformer 10 ₂ through which the R phase and S phase of the first transmission / distribution line 1L are straight through are differentially connected. May be.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ and the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ .

次に、本発明の第５の実施例による保護継電装置について、図７を参照して説明する。
本実施例による保護継電装置は、図７に示すように、電源端母線側の送配電線に設置された第１のストレート貫通変流器１０₁と、電源端母線側の送配電線に設置された、かつ、第１のストレート貫通変流器１０₁と差接続された第２のストレート貫通変流器１０₂と、受電端母線側の送配電線に設置された第３のストレート貫通変流器１０₃と、受電端母線側の送配電線に設置された、かつ、第３のストレート貫通変流器１０₃と差接続された第４のストレート貫通変流器１０₄と、差接続された第１および第２のストレート貫通変流器１０₁，１０₂からの短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄からの短絡電流との差電流（以下、「短絡電流Ｉ_Ry」と称する。）に基づいて送配電線における短絡事故を検出すると、電源端母線側の送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と受電端母線側の送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とをそれぞれ一括遮断する第１および第２のパルス符号変調電流差動継電器６０₁，６０₂（以下、「第１および第２のＰＣＭ電流差動継電器６０₁，６０₂」と称する。）とを具備する。
なお、第１および第２のＰＣＭ電流差動継電器６０₁，６０₂は、通信網を介して短絡電流を送受信する。 Next, a protective relay device according to a fifth embodiment of the present invention will be described with reference to FIG.
Protective relay apparatus according to this embodiment, as shown in FIG. 7, a first straight through current transformer 10 ₁ installed on the electric transmission of power terminal bus side, the electric transmission of power terminal bus side A second straight through current transformer 10 ₂ installed and differentially connected to the first straight through current transformer 10 _1, and a third straight through current installed in the power transmission and distribution line on the power receiving end bus side A current transformer 10 ₃ , a fourth straight through current transformer 10 ₄ installed on the power transmission / distribution line on the receiving end bus side and connected to the third straight through current transformer 10 ₃ by a difference; The short circuit current from the connected first and second straight through current transformers 10 ₁ and 10 ₂ and the short circuit current from the third and fourth straight through current transformers 10 ₃ and 10 ₄ connected to each other are connected. differential current (hereinafter. referred to as "short-circuit current I _Ry") short in transmission and distribution lines on the basis of the accident Upon detection, R-phase transmission and distribution lines of a power supply terminal bus side, S-phase and a first, second and third circuit breakers 2 ₁ to 2 ₃ to R-phase transmission and distribution lines receiving end bus side of which are respectively installed on the T-phase , First and second pulse code modulation current differential relays 60 ₁ , 60 ₂ (hereinafter referred to as the first and second pulse code modulation current differential relays 60 ₁ , 60) that collectively shut off the _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ respectively installed in the S phase and the T phase. , Referred to as “first and second PCM current differential relays 60 ₁ , 60 ₂ ”).
Note that the first and second PCM current differential relays 60 ₁ and 60 ₂ transmit and receive a short-circuit current via a communication network.

ここで、第１および第３のストレート貫通変流器１０₁，１０₃は、２次コイルを巻装した環状鉄心に送配電線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２および第４のストレート貫通変流器１０₂，１０₄は、２次コイルを巻装した環状鉄心に送配電線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、送配電線のＲ相およびＳ相はともに第１および第３のストレート貫通変流器１０₁，１０₃の極性方向に貫通されており、送配電線のＳ相およびＴ相はともに第２および第４のストレート貫通変流器１０₂，１０₄の極性方向に貫通されている。
また、第２のストレート貫通変流器１０₂は、第２のストレート貫通変流器１０₂から第１のＰＣＭ電流差動継電器６０₁に出力される短絡電流の極性が第１のストレート貫通変流器１０₁から第１のＰＣＭ電流差動継電器６０₁に出力される短絡電流の極性の逆となるように、第１のＰＣＭ電流差動継電器６０₁と接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から第２のＰＣＭ電流差動継電器６０₂に出力される短絡電流の極性が第３のストレート貫通変流器１０₃から第２のＰＣＭ電流差動継電器６０₂に出力される短絡電流の極性の逆となるように、第２のＰＣＭ電流差動継電器６０₂と接続されている。
さらに、差接続された第３および第４のストレート貫通変流器１０₃，１０₃は、差接続された第３および第４のストレート貫通変流器１０₃，１０₃から第２のＰＣＭ電流差動継電器６０₂に入力される短絡電流の極性が差接続された第１および第２のストレート貫通変流器１０₁，１０₂から第１のＰＣＭ電流差動継電器６０₁に入力される短絡電流の極性と逆となるように、第２のＰＣＭ電流差動継電器６０₂に接続されている。 Here, the first and third straight through current transformers 10 ₁ , 10 ₃ penetrate through an annular core around which a secondary coil is wound so that the R phase and S phase of the power transmission / distribution line are straight through in the same direction. The second and fourth straight through current transformers 10 ₂ and 10 ₄ are straight cores in the same direction with the S and T phases of the power transmission and distribution line on the annular core wound with the secondary coil. This is a through-type current transformer.
That is, both the R phase and S phase of the transmission and distribution line are penetrated in the polar direction of the first and third straight through current transformers 10 ₁ and 10 ₃ , and both the S phase and T phase of the transmission and distribution line are The second and fourth straight through current transformers 10 ₂ and 10 ₄ are penetrated in the polarity direction.
Further, the second straight through current transformer 10 ₂ has a polarity of the short-circuit current output from the _second straight through current transformer 10 ₂ to the first PCM current differential relay 60 _1. The first PCM current differential relay 60 ₁ is connected so that the polarity of the short-circuit current output from the current collector 10 ₁ to the first PCM current differential relay 60 ₁ is reversed. Similarly, the fourth straight through current transformer 10 ₄ has the same polarity as the third straight through current output from the _fourth straight through current transformer 10 ₄ to the second PCM current differential relay 60 _2. The second PCM current differential relay 60 ₂ is connected so that the polarity of the short-circuit current output from the current transformer 10 ₃ to the second PCM current differential relay 60 ₂ is reversed.
Further, the differentially connected third and fourth straight through current transformers 10 ₃ and 10 ₃ are connected to the second PCM current from the differentially connected third and fourth straight through current transformers 10 ₃ and 10 ₃ . A short circuit input to the first PCM current differential relay 60 ₁ from the first and second straight through current transformers 10 ₁ and 10 ₂ connected to each other in the polarity of the short circuit current input to the differential relay 60 _2. It is connected to the _second PCM current differential relay 602 so as to be opposite to the polarity of the current.

したがって、送配電線において短絡事故が発生していないときに送配電線の送電端のＲ相、Ｓ相およびＴ相に流れる送電端負荷電流をＩ_aR，Ｉ_aS，Ｉ_aTで表し、送配電線の受電端のＲ相、Ｓ相およびＴ相に流れる受電端負荷電流をＩ_bR，Ｉ_bS，Ｉ_bTで表すと、Ｒ相の送電端負荷電流Ｉ_aRとＳ相の送電端負荷電流Ｉ_aSとは１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れ、Ｒ相の受電端負荷電流Ｉ_bRとＳ相の受電端負荷電流Ｉ_bSとは１２０°の位相差で第３のストレート貫通変流器１０₃の環状鉄心を極性方向に貫通して流れる（図２参照）。また、Ｓ相の送電端負荷電流Ｉ_aSとＴ相の送電端負荷電流Ｉ_aTとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れ、Ｓ相の受電端負荷電流Ｉ_bSとＴ相の受電端負荷電流Ｉ_bTとは１２０°の位相差で第４のストレート貫通変流器１０₄の環状鉄心を極性方向に貫通して流れる（図２参照）。
そのため、差接続された第１および第２のストレート貫通変流器１０₁，１０₂から第１のＰＣＭ電流差動継電器６０₁に入力される送電端負荷電流Ｉ_aは、上述した第１の実施例による過電流継電器４における場合と同様にして、Ｒ相の送電端負荷電流Ｉ_aRとＴ相の送電端負荷電流Ｉ_aTのベクトル差となり、送電端負荷電流Ｉ_aの振幅はＲ相の送電端負荷電流Ｉ_aR（Ｔ相の送電端負荷電流Ｉ_aT）の振幅の３^1/2倍となる。同様に、差接続された第３および第４のストレート貫通変流器１０₃，１０₄から第２のＰＣＭ電流差動継電器６０₂に入力される受電端負荷電流Ｉ_bは、Ｒ相の受電端負荷電流Ｉ_bRとＴ相の受電端負荷電流Ｉ_bTとのベクトル差（極性は負）となり、受電端負荷電流Ｉ_bの振幅はＲ相の受電端負荷電流Ｉ_bR（Ｔ相の受電端負荷電流Ｉ_bT）の振幅の３^1/2倍となる。
Ｉ_a＝Ｉ_aR−Ｉ_aT
｜Ｉ_a｜＝｜Ｉ_aR−Ｉ_aT｜＝３^1/2×｜Ｉ_aR｜＝３^1/2×｜Ｉ_aT｜
Ｉ_b＝−（Ｉ_bR−Ｉ_bT）
｜Ｉ_b｜＝｜Ｉ_bR−Ｉ_bT｜＝３^1/2×｜Ｉ_bR｜＝３^1/2×｜Ｉ_bT｜
その結果、第１および第２のＰＣＭ電流差動継電器６０₁，６０₂に入力される負荷電流Ｉは、送電端負荷電流Ｉ_aと受電端負荷電流Ｉ_bとのベクトル和で表され、負荷電流Ｉの振幅は“０”（｜Ｉ｜＝｜Ｉ_a＋Ｉ_b｜＝０）となる。 Therefore, the transmission end load current flowing in the R phase, S phase and T phase of the transmission end of the transmission / distribution line when no short circuit accident has occurred in the transmission / distribution line is expressed as I _aR , I _aS , I _aT , When the receiving end load currents flowing in the R phase, S phase, and T phase at the receiving end of the _wire are expressed by I _bR , I _bS , I _bT , the R phase transmission end load current I _aR and the S phase transmission end load current I the _aS flows through the first straight through current transformer 10 ₁ toroid in polar direction with a phase difference of 120 °, the receiving end load R-phase current I _bR and S phases of the receiving end load current I _bS Flows through the annular core of the third straight through current transformer 10 _{3 in} the polarity direction with a phase difference of 120 ° (see FIG. 2). Further, through the sending end load current I _aS and T phases of the sending end load current I _aT and a second straight through current transformer 10 _{and second} annular core with a phase difference of 120 ° is the S-phase in the polar direction flow The S-phase receiving end load current I _bS and the T-phase receiving end load current I _bT flow through the annular iron core of the fourth straight through current transformer 10 _{4 in} the polarity direction with a phase difference of 120 ° ( (See FIG. 2).
Therefore, the transmission end load current I _a input from the first and second straight through current transformers 10 ₁ and 10 _{2 connected} to the difference to the first PCM current differential relay 60 ₁ is equal to the first described above. Similarly to the case of the overcurrent relay 4 according to the embodiment, the vector difference between the R-phase transmission end load current I _aR and the T-phase transmission end load current I _aT is obtained. The amplitude of the transmission end load current I _a is R-phase. The transmission end load current I _aR (T-phase transmission end load current I _aT ) is 3 ^1/2 times the amplitude. Similarly, the third and fourth straight through current transformer _103, 10 receiving end load currents ₄ is input to the second PCM current differential relay 60 ₂ I _b that is connected, receiving the R-phase The vector difference (polarity is negative) between the end load current I _bR and the T-phase receiving end load current I _bT, and the amplitude of the receiving end load current I _b is R-phase receiving end load current I _bR (T-phase receiving end 3 ^1/2 times the amplitude of the load current I _bT ).
I _a = I _aR −I _aT
| I _a | = | I _aR −I _aT | = 3 ^1/2 × | I _aR | = 3 ^1/2 × | I _aT |
I _b = − (I _bR −I _bT )
| I _b | = | I _bR −I _bT | = 3 ^1/2 × | I _bR | = 3 ^1/2 × | I _bT |
As a result, the load current I input to the first and second PCM current differential relays 60 ₁ and 60 ₂ is expressed as a vector sum of the transmission end load current I _a and the reception end load current I _b, and the load The amplitude of the current I is “0” (| I | = | I _a + I _b | = 0).

また、送配電線において短絡事故が発生したときに送配電線のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、短絡電流Ｉ_Ry（差接続された第１および第２のストレート貫通変流器１０₁，１０₂からの短絡電流と差接続された第３および第４のストレート貫通変流器１０₃，１０₄からの短絡電流との差電流）は、上述した第１の実施例による過電流継電器４における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合（図３（ａ）参照）。
Ｉ_Ry＝−Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合（図３（ｂ）参照）
Ｉ_Ry＝Ｉ_FS
｜Ｉ_Ry｜＝｜Ｉ_FS｜
（３）Ｔ相−Ｒ相間の短絡事故の場合（図３（ｃ）参照）
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝２×｜Ｉ_FR｜＝２×｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合（図３（ｄ）参照）
Ｉ_Ry＝Ｉ_FR−Ｉ_FT
｜Ｉ_Ry｜＝３^1/2×｜Ｉ_FR｜＝３^1/2×｜Ｉ_FT｜ Also, when the short-circuit current flowing in the R-phase, S-phase, and T-phase of the transmission / distribution line is represented by I _FR , I _FS , I _FT when a short-circuit accident occurs in the transmission / distribution line, the short-circuit current I _Ry (differential connection is established) The difference between the short-circuit current from the first and second straight through current transformers 10 ₁ and 10 ₂ and the short-circuit current from the third and fourth straight through current transformers 10 ₃ and 10 _{4 connected} to each other. ) Is expressed as follows according to the accident aspect in the same manner as in the overcurrent relay 4 according to the first embodiment described above.
(1) In the case of a short circuit accident between the R phase and the S phase (see FIG. 3A).
I _Ry = −I _FS
| I _Ry | = | I _FS |
(2) In the case of a short circuit accident between the S phase and the T phase (see FIG. 3B)
I _Ry = I _FS
| I _Ry | = | I _FS |
(3) In the case of a short-circuit accident between T phase and R phase (see Fig. 3 (c))
I _Ry = I _FR −I _FT
| I _Ry | = 2 × | I _FR | = 2 × | I _FT |
(4) In the case of a short circuit accident between R phase, S phase, and T phase (see FIG. 3D)
I _Ry = I _FR −I _FT
| I _Ry | = 3 ^1/2 × | I _FR | = 3 ^1/2 × | I _FT |

第１および第２のＰＣＭ電流差動継電器６０₁，６０₂は、短絡電流Ｉ_Ryの振幅が電流整定値を超えた場合には、送配電線において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 The first and second PCM current differential relays 60 ₁ and 60 ₂ determine that a short-circuit accident has occurred in the transmission and distribution line when the amplitude of the short-circuit current I _Ry exceeds the current settling value. The 1st to 6th circuit breakers 2 ₁ to 2 ₆ are collectively cut off.

なお、送配電線のＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続したが、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよいし、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを差接続してもよい。
第３および第４のストレート貫通変流器１０₃，１０₄についても同様である。 The second straight through current transformer to S phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and S-phase of the transmission and distribution lines are penetrating straight is penetrating straight vessel 10 ₂ and a have been connected, S-phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and T-phase of the transmission and distribution lines are penetrating straight is through straight The second straight through current transformer 10 ₂ may be differentially connected, or the first straight through current transformer 10 _{1 in} which the R-phase and T-phase of the transmission / distribution line are penetrated straight and the transmission / distribution line. The second straight through current transformer 10 _{2 in} which the R phase and the S phase are straightly penetrated may be differentially connected.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ .

以上説明したように、第１乃至第５の実施例では、差接続されたストレート貫通変流器（図１に示した差接続された第１および第２のストレート貫通変流器１０₁，１０₂など）を用いることにより、変流器および短絡保護継電器（図１に示した過電流継電器４など）の設置台数を更に削減することができるが、上述したように短絡電流Ｉ_Ryの振幅が事故様相によって異なる。
すなわち、Ｔ相−Ｒ相間の短絡事故における短絡電流Ｉ_Ryの振幅は、Ｒ相−Ｓ相間の短絡事故およびＳ相−Ｔ相間の短絡事故における短絡電流Ｉ_Ryの振幅の２倍となり、また、負荷電流およびＲ相−Ｓ相−Ｔ相間の短絡事故における短絡電流Ｉ_Ryの振幅は、Ｒ相−Ｓ相間の短絡事故およびＳ相−Ｔ相間の短絡事故における短絡電流Ｉ_Ryの振幅の３^1/2倍となる。
そのため、短絡保護継電器の検出感度および動作時間をすべての事故様相に対して同じにすることができない。 As described above, in the first to fifth embodiments, the differentially connected straight through current transformers (the differentially connected first and second straight through current transformers 10 ₁ , 10 shown in FIG. 1 are used. ₂ ), the number of installed current transformers and short circuit protection relays (such as the overcurrent relay 4 shown in FIG. 1) can be further reduced. As described above, the amplitude of the short circuit current I _Ry is reduced. It depends on the accident aspect.
That is, the amplitude of the short-circuit current _IRy in the short-circuit accident between the T phase and the R-phase is twice the amplitude of the short-circuit current _IRy in the short-circuit accident between the R-phase and the S-phase and the short-circuit accident between the S-phase and the T-phase. The amplitude of the short-circuit current I _Ry in the short-circuit accident between the load current and the R phase-S phase-T phase is 3 ¹ of the amplitude of the short-circuit current I _Ry in the short-circuit accident between the R phase-S phase and the short-circuit accident between the S phase-T phase. ^{/ 2} times.
Therefore, the detection sensitivity and operating time of the short circuit protection relay cannot be made the same for all accident aspects.

そこで、線間電圧、相電圧または相・線間電圧（相電圧と線間電圧との組合せ）に基づいて事故様相を判定し、差接続されたストレート貫通変流器からの短絡電流を事故様相判定結果に応じて１倍、１／２倍または１／３^1/2倍とする演算処理部を、差接続されたストレート貫通変流器と短絡保護継電器との間にまたは短絡保護継電器に設けてもよい。 Therefore, the accident aspect is judged based on the line voltage, phase voltage, or phase / line voltage (combination of the phase voltage and the line voltage), and the short-circuit current from the straight-through current transformer that is connected in a differential manner is detected. 1x according to the determination result, it provided an arithmetic processing unit for 1/2-fold or 1/3 ^1/2, or short-circuit protection relay between the differential connected straight through current transformer and short-circuit protection relay May be.

表１に、３つの線間電圧に基づく事故様相判定条件を示す。なお、○印は、母線に設置された不足電圧継電器からの電圧情報に基づいて電圧低下が検出された線間電圧を示し、また、×印は、この不足電圧継電器からの電圧情報に基づいて電圧低下が検出されなかった線間電圧を示す（電圧低下の検出感度は定格電圧の７５〜８０％程度とする。）。

Table 1 shows the accident condition determination conditions based on the three line voltages. In addition, ○ mark indicates the line voltage in which the voltage drop is detected based on the voltage information from the undervoltage relay installed on the bus, and the X mark is based on the voltage information from this undervoltage relay. The line voltage in which no voltage drop was detected is shown (the voltage drop detection sensitivity is about 75 to 80% of the rated voltage).

表２に、３つの相電圧に基づく事故様相判定条件を示す。なお、○印は、母線に設置された不足電圧継電器からの電圧情報に基づいて電圧低下が検出された相電圧を示し、また、×印は、この不足電圧継電器からの電圧情報に基づいて電圧低下が検出されなかった相電圧を示す（電圧低下の検出感度は定格電圧の７５〜８０％程度とする。）。

Table 2 shows the accident condition determination conditions based on the three phase voltages. In addition, a circle indicates a phase voltage in which a voltage drop is detected based on voltage information from an undervoltage relay installed on the bus, and a cross indicates a voltage based on voltage information from the undervoltage relay. The phase voltage in which no decrease was detected is indicated (the voltage drop detection sensitivity is about 75 to 80% of the rated voltage).

表３に、相・線間電圧に基づく事故様相判定条件を示す。なお、○印は、母線に設置された不足電圧継電器からの電圧情報に基づいて電圧低下が検出された相電圧および線間電圧を示し、また、×印は、この不足電圧継電器からの電圧情報に基づいて電圧低下が検出されなかった相電圧および線間電圧を示す（電圧低下の検出感度は定格電圧の７５〜８０％程度とする。）。

Table 3 shows the accident condition judgment conditions based on the phase / line voltage. The circles indicate the phase voltage and line voltage at which a voltage drop is detected based on the voltage information from the undervoltage relay installed on the bus, and the x indicates voltage information from the undervoltage relay. The phase voltage and the line voltage in which no voltage drop was detected based on the above are shown (voltage drop detection sensitivity is about 75 to 80% of the rated voltage).

演算処理部は、事故様相判定結果がＲ相−Ｓ相間の短絡事故またはＳ相−Ｔ相間の短絡事故であることを示す場合には短絡電流を１倍とし、事故様相判定結果がＴ相−Ｒ相間の短絡事故であることを示す場合には短絡電流を１／２倍とし、事故様相判定結果がＲ相−Ｓ相−Ｔ相間の短絡事故であることを示す場合には短絡電流を１／３^1/2倍とする。また、演算処理部は、負荷電流Ｉを１／３^1/2倍とする。 The arithmetic processing unit multiplies the short-circuit current when the accident mode determination result indicates a short circuit accident between the R phase and the S phase or a short circuit accident between the S phase and the T phase, and the accident mode determination result is the T phase− The short circuit current is halved to indicate a short circuit accident between R phases, and the short circuit current is set to 1 when the accident mode determination result indicates a short circuit accident between R phase, S phase, and T phase. / 3 ^1/2 times. Further, the arithmetic processing unit sets the load current I to 1/3 ^1/2 times.

演算処理部は、図８に示すように、線間電圧、相電圧または相・線間電圧（相電圧と線間電圧との組合せ）に基づいて事故様相を判定する事故様相判定回路７１と、差接続されたストレート貫通変流器からの短絡電流を１倍する第１の振幅調整回路７２₁と、短絡電流を１／２倍する第２の振幅調整回路７２₂と、負荷電流Ｉおよび短絡電流を１／３^1/2倍する第３の振幅調整回路７２₃と、事故様相判定回路７１から入力されるスイッチ制御信号Ｓ_SWに応じて基づいて第１乃至第３の振幅調整回路７２₁〜７２₃の出力信号のうちのいずれか１つを選択する選択スイッチ７３とで構成してもよい。 As shown in FIG. 8, the arithmetic processing unit includes an accident aspect determination circuit 71 that determines an accident aspect based on a line voltage, a phase voltage, or a phase / line voltage (combination of a phase voltage and a line voltage); A first amplitude adjustment circuit 72 ₁ that doubles the short-circuit current from the straight-through current transformer connected by difference, a second amplitude adjustment circuit 72 ₂ that doubles the short-circuit current, load current I, and short circuit current and 1/3 ^1/2 multiplying third amplitude adjustment circuit 72 _3, the switch control signal S first to the basis in accordance with the _SW third amplitude adjustment circuit 72 ₁ which is input from the fault aspects judging circuit 71 it may be constituted by a selection switch 73 for selecting one of the 72 _third output signal.

選択スイッチ７３は、通常は、第３の振幅調整回路７２₃の出力信号を選択するようにされている。これにより、短絡事故が発生していないときには、差接続されたストレート貫通変流器からの負荷電流Ｉは、第３の振幅調整回路７２₃において１／３^1/2倍されたのちに、選択スイッチ７３を介して短絡保護継電器に入力される。 The selection switch 73 normally selects the output signal of the _third amplitude adjustment circuit 723. Thus, after when the short-circuit fault does not occur, the load current I from the differential connected straight through the current transformer, which is 1/3 ^1/2 In the third amplitude adjusting circuit 72 _3, selected It is input to the short circuit protection relay through the switch 73.

事故様相判定回路７１は、「Ｔ相−Ｒ相間の短絡事故である」と判定すると、第２の振幅調整回路７２₂の出力信号を選択スイッチ７３に選択させるスイッチ制御信号Ｓ_SWを出力する。これにより、Ｔ相−Ｒ相間の短絡事故が発生したときには、差接続されたストレート貫通変流器からの短絡電流は、第２の振幅調整回路７２₂において１／２倍されたのちに、選択スイッチ７３を介して短絡保護継電器に入力される。 If the accident aspect determination circuit 71 determines that “a short-circuit accident between the T phase and the R phase”, it outputs a switch control signal _SSW that causes the selection switch 73 to select the output signal of the _second amplitude adjustment circuit 722. As a result, when a short-circuit accident between the T phase and the R phase occurs, the short-circuit current from the straight-through current transformer connected by difference is doubled in the _second amplitude adjusting circuit 722 and then selected. It is input to the short circuit protection relay through the switch 73.

また、事故様相判定回路７１は、「Ｒ相−Ｓ相間の短絡事故である」または「Ｓ相−Ｔ相間の短絡事故である」と判定すると、第１の振幅調整回路７２₁の出力信号を選択スイッチ７３に選択させるスイッチ制御信号Ｓ_SWを出力する。これにより、Ｒ相−Ｓ相間の短絡事故またはＳ相−Ｔ相間の短絡事故が発生したときには、差接続されたストレート貫通変流器からの短絡電流は、第１の振幅調整回路７２₁において１倍されたのちに、選択スイッチ７３を介して短絡保護継電器に入力される。 In addition, when the accident aspect determination circuit 71 determines that “it is a short circuit accident between the R phase and the S phase” or “a short circuit accident between the S phase and the T phase”, the output signal of the _first amplitude adjustment circuit 721 is output. A switch control signal _SSW to be selected by the selection switch 73 is output. As a result, when a short circuit accident between the R phase and the S phase or a short circuit accident between the S phase and the T phase occurs, the short circuit current from the straight through current transformer that is differentially connected is 1 in the first amplitude adjustment circuit 72 ₁ . After being doubled, the signal is input to the short-circuit protection relay via the selection switch 73.

さらに、事故様相判定回路７１は、「Ｒ相−Ｓ相−Ｔ相間の短絡事故である」と判定すると、第３の幅調整回路７２₃の出力信号を選択スイッチ７３に選択させるスイッチ制御信号Ｓ_SWを出力する。これにより、Ｒ相−Ｓ相−Ｔ相間の短絡事故が発生した場合には、差接続されたストレート貫通変流器からの短絡電流は、第３の振幅調整回路７２₃において１／３^1/2倍されたのちに、選択スイッチ７３を介して短絡保護継電器に入力される。 Further, when the accident aspect determination circuit 71 determines that “a short-circuit accident between the R phase, the S phase, and the T phase”, the switch control signal S that causes the selection switch 73 to select the output signal of the _third width adjustment circuit 723. Outputs _SW . As a result, when a short circuit accident between the R phase, the S phase, and the T phase occurs, the short circuit current from the straight through current transformer that is differentially connected is reduced to 1/3 ^{1 /} in the third amplitude adjustment circuit 72 ₃ . in after being ^doubled, it is input to the short-circuit protective relay via the selection switch 73.

その結果、短絡電流の振幅を事故様相によらず同じにすることができるので、短絡保護継電器の検出感度および動作時間を同じにすることができる。 As a result, the amplitude of the short-circuit current can be made the same regardless of the accident aspect, so that the detection sensitivity and the operation time of the short-circuit protection relay can be made the same.

次に、本発明の第６の実施例による保護継電装置について、図９乃至図１１を参照して説明する。
本実施例による保護継電装置は、図９に示すように、送配電線に設置された第１のストレート貫通変流器１０₁と、送配電線に設置された第２のストレート貫通変流器１０₂と、第１のストレート貫通変流器１０₁から入力される第１の短絡電流Ｉ_Ry1に基づいて送配電線の短絡事故を検出すると、送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃を一括遮断する第１の過電流継電器４₁と、第２のストレート貫通変流器１０₂から入力される第２の短絡電流Ｉ_Ry2に基づいて短絡事故を検出すると、第１乃至第３の遮断器２₁〜２₃を一括遮断する第２の過電流継電器４₂とを具備する。 Next, a protective relay device according to a sixth embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 9, the protective relay device according to the present embodiment includes a _first straight through current transformer 101 installed in the transmission / distribution line and a second straight through current transformation installed in the transmission / distribution line. When a short circuit accident of the transmission / distribution line is detected on the basis of the first short-circuit current I _Ry1 input from the transformer 10 ₂ and the first straight through current transformer 10 ₁ , the R phase, S phase and T of the transmission / distribution line The first overcurrent relay 4 ₁ that collectively cuts off the _first to _third circuit breakers 2 ₁ to 2 ₃ installed in each phase, and the second input from the second straight through current transformer 10 ₂ When a short-circuit accident is detected based on the short-circuit current I _Ry2 , a second overcurrent relay 4 ₂ that collectively cuts off the _first to _third circuit breakers 2 ₁ to 2 ₃ is provided.

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に送配電線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に送配電線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、送配電線のＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向（環状鉄心の第１の開口面から環状鉄心の第２の開口面への方向）に貫通されており、送配電線のＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向（環状鉄心の第１の開口面から環状鉄心の第２の開口面への方向）に貫通されている。 The first straight through current transformer 10 ₁ is R phase and the S phase of the transmission and distribution lines to the annular core formed by winding a secondary coil of the through-type current transformer which is passed through straight in the same direction , the second straight through current transformer 10 ₂ is S-phase and T-phase of the transmission and distribution lines to the annular core formed by winding a secondary coil was passed through straight in the same direction through type current transformer.
That is, through the R-phase and S-phase of the electric transmission both first straight through current transformer 10 _first polarity direction (second direction to the opening surface of the annular core from the first opening surface of the annular core) by which, S-phase and T-phase of the transmission and distribution lines are both second straight through current transformer 10 _second polarity direction (direction from the first opening surface of the annular core to a second opening surface of the annular core) It is penetrated by.

したがって、短絡事故が発生していないときに送配電線のＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、図１０に示すようにＲ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとが１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れるため、第１のストレート貫通変流器１０₁から第１の過電流継電器４₁に入力される第１の負荷電流Ｉ₁はＲ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとのベクトル和となり、第１の負荷電流Ｉ₁の振幅はＲ相の負荷電流Ｉ_R（Ｓ相の負荷電流Ｉ_S）の振幅となる。
Ｉ₁＝Ｉ_R＋Ｉ_S
｜Ｉ₁｜＝｜Ｉ_R＋Ｉ_S｜＝｜Ｉ_R｜＝｜Ｉ_S｜
同様に、図１０に示すようにＳ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとが１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れるため、第２のストレート貫通変流器１０₂から第２の過電流継電器４₂に入力される第２の負荷電流Ｉ₂はＳ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとのベクトル和となり、第２の負荷電流Ｉ₂の振幅はＳ相の負荷電流Ｉ_S（Ｔ相の負荷電流Ｉ_T）の振幅となる。
Ｉ₂＝Ｉ_S＋Ｉ_T
｜Ｉ₂｜＝｜Ｉ_S＋Ｉ_T｜＝｜Ｉ_S｜＝｜Ｉ_T｜ Therefore, when the load currents flowing in the R phase, S phase, and T phase of the transmission / distribution line when no short circuit accident has occurred are represented by I _R , I _S , and I _T , as shown in FIG. Since the current I _R and the S-phase load current I _S flow through the annular core of the first straight through current transformer 101 _{1 in} the polarity direction with a phase difference of 120 °, the first straight through current transformer The first load current I ₁ input from 10 ₁ to the first overcurrent relay 4 ₁ is the vector sum of the R-phase load current I _R and the S-phase load current I _S, and the first load current I 1 The amplitude of _{1 is} the amplitude of the R-phase load current I _R (S-phase load current I _S ).
I ₁ = I _R + I _S
| I ₁ | = | I _R + I _S | = | I _R | = | I _S |
Similarly, through the polarity direction of the load current I _S and T phases of the load current I _T and the second straight through current transformer 10 _{and second} annular core with a phase difference of 120 ° in the S-phase, as shown in FIG. 10 order to flow, the second load current I ₂ load S phase current I _S and T phases of the load current I is input from the second straight through current transformer 10 ₂ in the second overcurrent relay 4 ₂ It becomes a vector sum with _T, and the amplitude of the _second load current I _{2 is} the amplitude of the S-phase load current I _S (T-phase load current I _T ).
I ₂ = I _S + I _T
| I ₂ | = | I _S + I _T | = | I _S | = | I _T |

また、送配電線において短絡事故が発生したときに送配電線のＲ相、Ｓ相およびＴ相に流れる送配電線のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、第１および第２の短絡電流Ｉ_Ry1，Ｉ_Ry2は、短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTのインピーダンス角をθとすると、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｒ相−Ｓ相間の短絡事故が発生すると、図９に破線の矢印で示すように送配電線のＲ相にＲ相の短絡電流Ｉ_FRが内部方向に流れ、送配電線のＳ相にＳ相の短絡電流Ｉ_FSが外部方向に流れるが、送配電線のＴ相にはＴ相の短絡電流Ｉ_FTが流れない。
したがって、第１のストレート貫通変流器１０₁から第１の過電流継電器４₁に入力される第１の短絡電流Ｉ_Ry1はＲ相の短絡電流Ｉ_FRとＳ相の短絡電流Ｉ_FSとのベクトル和となり、第１の短絡電流Ｉ_Ry1の振幅は“０”となる（図１１（ａ）参照。なお、図３においては、送配電線の内部方向に流れる短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTは実線の矢印で、送配電線の外部方向に流れる短絡電流Ｉ_FR，Ｉ_FS，Ｉ_FTは一点鎖線の矢印で示している。）。
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS＝０
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝０
また、第２のストレート貫通変流器１０₂から第２の過電流継電器４₂に入力される第２の短絡電流Ｉ_Ry2はＳ相の短絡電流Ｉ_FSとなり、第２の短絡電流Ｉ_Ry2の振幅はＳ相の短絡電流Ｉ_FSの振幅となる（図１１（ａ）参照）。
Ｉ_Ry2＝Ｉ_FS
｜Ｉ_Ry2｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｓ相−Ｔ相間の短絡事故が発生すると、送配電線のＳ相にＳ相の短絡電流Ｉ_FSが内部方向に流れ、送配電線のＴ相にＴ相の短絡電流Ｉ_FTが外部方向に流れるが、送配電線のＲ相にはＲ相の短絡電流Ｉ_FRが流れない。
したがって、第１のストレート貫通変流器１０₁から第１の過電流継電器４₁に入力される第１の短絡電流Ｉ_Ry1はＳ相の短絡電流Ｉ_FSとなり、第１の短絡電流Ｉ_Ry1の振幅はＳ相の短絡電流Ｉ_FSの振幅となる（図１１（ｂ）参照）。
Ｉ_Ry1＝Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FS｜
また、第２のストレート貫通変流器１０₂から第２の過電流継電器４₂に入力される第２の短絡電流Ｉ_Ry2はＳ相の短絡電流Ｉ_FSとＴ相の短絡電流Ｉ_FTとのベクトル和となり、第２の短絡電流Ｉ_Ry2の振幅は“０”となる（図１１（ｂ）参照）。
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT＝０
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝０
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｔ相−Ｒ相間の短絡事故が発生すると、送配電線のＴ相にＴ相の短絡電流Ｉ_FTが内部方向に流れ、送配電線のＲ相にＲ相の短絡電流Ｉ_FRが外部方向に流れるが、送配電線のＳ相にはＳ相の短絡電流Ｉ_FSが流れない。
したがって、第１のストレート貫通変流器１０₁から第１の過電流継電器４₁に入力される第１の短絡電流Ｉ_Ry1はＲ相の短絡電流Ｉ_FRとなり、第１の短絡電流Ｉ_Ry1の振幅はＲ相の短絡電流Ｉ_FRの振幅となる（図１１（ｃ）参照）。
Ｉ_Ry1＝Ｉ_FR
｜Ｉ_Ry1｜＝｜Ｉ_FR｜
また、第２のストレート貫通変流器１０₂から第２の過電流継電器４₂に入力される第２の短絡電流Ｉ_Ry2はＴ相の短絡電流Ｉ_FTとなり、第２の短絡電流Ｉ_Ry2の振幅はＴ相の短絡電流Ｉ_FTの振幅となる（図１１（ｃ）参照）。
Ｉ_Ry2＝Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｒ相−Ｓ相−Ｔ相間の短絡事故が発生すると、送配電線のＲ相、Ｓ相およびＴ相にＲ相の短絡電流Ｉ_FR、Ｓ相の短絡電流Ｉ_FSおよびＴ相の短絡電流Ｉ_FTが位相差１２０°で内部方向にそれぞれ流れる。
したがって、第１のストレート貫通変流器１０₁から第１の過電流継電器４₁に入力される第１の短絡電流Ｉ_Ry1はＲ相の短絡電流Ｉ_FRとＳ相の短絡電流Ｉ_FSとのベクトル和となり、第１の短絡電流Ｉ_Ry1の振幅はＲ相の短絡電流Ｉ_FR（Ｓ相の短絡電流Ｉ_FS）の振幅となる（図１１（ｄ）参照）。
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
また、第２のストレート貫通変流器１０₂から第２の過電流継電器４₂に入力される第２の短絡電流Ｉ_Ry2はＳ相の短絡電流Ｉ_FSとＴ相の短絡電流Ｉ_FTとのベクトル和となり、第２の短絡電流Ｉ_Ry2の振幅はＳ相の短絡電流Ｉ_FS（Ｔ相の短絡電流Ｉ_FT）の振幅となる（図１１（ｄ）参照）。
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜ Also, R-phase of the transmission and distribution lines when the short circuit occurs in the transmission and distribution lines, the transmission and distribution lines flowing through the S-phase and T-phase R phase, S phase and the short-circuit current flowing through the T-phase I _FR, I _FS, expressed in I _FT, first and second short-circuit current I _Ry1, I _Ry2 is short-circuit current I _FR, I _FS, when the impedance angle I _FT theta, expressed as follows depending on the accident appearance The
(1) In the case of a short circuit accident between the R phase and the S phase When a short circuit accident occurs between the R phase and the S phase, the short circuit current I _FR of the R phase is generated in the R phase of the transmission and distribution line as shown by the broken arrow in FIG. The S-phase short-circuit current I _FS flows in the S-phase of the transmission / distribution line, and the S-phase short-circuit current I _FS flows in the external direction, but the T-phase short-circuit current I _FT does not flow in the T-phase of the transmission / distribution line.
Accordingly, the first short-circuit current I _Ry1 inputted from the first straight through current transformer 10 ₁ in the first overcurrent relay 4 ₁ of the short-circuit current I _FS of the short circuit current I _FR and S phases of the R phase The vector sum is obtained, and the amplitude of the first short-circuit current I _Ry1 is “0” (see FIG. 11A). In FIG. 3, the short-circuit currents I _FR , I _FS , _IFT is a solid arrow, and short-circuit currents I _FR , I _FS , and I _FT flowing in the outward direction of the transmission / distribution line are indicated by dashed-dotted arrows).
I _Ry1 = I _FR + I _FS = 0
| I _Ry1 | = | I _FR + I _FS | = 0
The second short-circuit current I _Ry2 input from the second straight through current transformer 10 ₂ to the second overcurrent relay 4 ₂ becomes the S-phase short-circuit current I _FS , and the second short-circuit current I _Ry2 The amplitude is the amplitude of the S-phase short-circuit current I _FS (see FIG. 11A).
I _Ry2 = I _FS
| I _Ry2 | = | I _FS |
(2) In the case of a short-circuit accident between the S phase and the T phase When a short circuit accident between the S phase and the T phase occurs, the S phase short circuit current I _FS flows in the S phase of the transmission and distribution line in the internal direction, and the T of the transmission and distribution line Although the T-phase short-circuit current I _FT flows in the external direction in the phase, the R-phase short-circuit current I _FR does not flow in the R-phase of the transmission and distribution line.
Accordingly, the first short-circuit current I _Ry1 inputted from the first straight through current transformer 10 ₁ in the first overcurrent relay 4 ₁ short-circuit current I _FS next to S phase, the first short-circuit current I _Ry1 The amplitude is the amplitude of the S-phase short-circuit current I _FS (see FIG. 11B).
I _Ry1 = I _FS
| I _Ry1 | = | I _FS |
The second short-circuit current I _Ry2 input from the second straight through current transformer 10 ₂ to the second overcurrent relay 4 ₂ is the difference between the S-phase short-circuit current I _FS and the T-phase short-circuit current I _FT . The vector sum is obtained, and the amplitude of the second short-circuit current I _Ry2 is “0” (see FIG. 11B).
I _Ry2 = I _FS + I _FT = 0
| I _Ry2 | = | I _FS + I _FT | = 0
(3) In the case of a short circuit accident between the T phase and the R phase When a short circuit accident occurs between the T phase and the R phase, a T phase short circuit current I _FT flows in the T phase of the transmission and distribution line, and the R of the transmission and distribution line. While the short-circuit current I _FR of R-phase to phase flows to the outside direction, the S-phase of the transmission and distribution lines does not flow a short-circuit current I _FS of S phase.
Accordingly, the first short-circuit current I _Ry1 inputted from the first straight through current transformer 10 ₁ in the first overcurrent relay 4 ₁ short-circuit current I _FR next to R-phase, the first short-circuit current I _Ry1 The amplitude is the amplitude of the R-phase short-circuit current I _FR (see FIG. 11C).
I _Ry1 = I _FR
｜ I _Ry1 ｜＝｜ I _FR ｜
The second short-circuit current I _Ry2 input from the second straight through current transformer 10 ₂ to the second overcurrent relay 4 ₂ becomes the T-phase short-circuit current I _FT , and the second short-circuit current I _Ry2 The amplitude is the amplitude of the T-phase short-circuit current _IFT (see FIG. 11C).
I _Ry2 = I _FT
| I _Ry2 | = | I _FT |
(4) In the case of a short circuit accident between R phase, S phase, and T phase When a short circuit accident between R phase, S phase, and T phase occurs, short circuit current I of R phase to R phase, S phase, and T phase of the transmission and distribution line _FR and S-phase short-circuit current I _FS and T-phase short-circuit current I _FT flow in the internal direction with a phase difference of 120 °.
Accordingly, the first short-circuit current I _Ry1 inputted from the first straight through current transformer 10 ₁ in the first overcurrent relay 4 ₁ of the short-circuit current I _FS of the short circuit current I _FR and S phases of the R phase The vector sum is obtained, and the amplitude of the first short-circuit current I _{Ry1 is} the amplitude of the R-phase short-circuit current I _FR (S-phase short-circuit current I _FS ) (see FIG. 11D).
I _Ry1 = I _FR + I _FS
| I _Ry1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
The second short-circuit current I _Ry2 input from the second straight through current transformer 10 ₂ to the second overcurrent relay 4 ₂ is the difference between the S-phase short-circuit current I _FS and the T-phase short-circuit current I _FT . The vector sum is obtained, and the amplitude of the second short-circuit current I _{Ry2 is} the amplitude of the S-phase short-circuit current I _FS (T-phase short-circuit current I _FT ) (see FIG. 11D).
I _Ry2 = I _FS + I _FT
| I _Ry2 | = | I _FS + I _FT | = | I _FS | = | I _FT |

第１の過電流継電器４₁は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、送配電線に短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃を一括遮断する。
また、第２の過電流継電器４₂は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、送配電線に短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃を一括遮断する。 First overcurrent relay 4 _1, when the amplitude of the first short-circuit current I _Ry1 exceeds the current setting value, it is determined that the short-circuit failure occurs in the transmission and distribution lines, the first to third Break breakers 2 _{1 to} 2 ₃ at _once .
The second overcurrent relay 4 _2, when the amplitude of the second short-circuit current I _Ry2 exceeds the current setting value, it is determined that the short-circuit failure occurs in the transmission and distribution lines, first to The circuit breakers 2 ₁ to 2 ₃ of ₃ are collectively shut off.

なお、送配電線のＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いたが、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよいし、送配電線のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と送配電線のＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよい。 The second straight through current transformer to S phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and S-phase of the transmission and distribution lines are penetrating straight is penetrating straight and using a vessel 10 ₂ but, S-phase and T-phase of the first straight through current transformer 10 ₁ and transmission and distribution lines to R-phase and T-phase of the transmission and distribution lines are penetrating straight is penetrating straight The second straight through current transformer 10 ₂ may be used, or the first straight through current transformer 10 _{1 in} which the R phase and T phase of the transmission / distribution line are penetrated straight and the R phase of the transmission / distribution line. Alternatively, a second straight through current transformer 10 ₂ in which the S phase is straightly passed may be used.

次に、本発明の第７の実施例による保護継電装置について、図１２を参照して説明する。
本実施例による保護継電装置は、図１２に示すように、変圧器５の１次側に設置された第１のストレート貫通変流器１０₁と、変圧器５の１次側に設置された第２のストレート貫通変流器１０₂と、変圧器５の２次側に設置された第３のストレート貫通変流器１０₃と、変圧器５の２次側に設置された第４のストレート貫通変流器１０₄と、第１のストレート貫通変流器１０₁から入力される短絡電流と第３のストレート貫通変流器１０₃から入力される短絡電流との差電流（以下、「第１の短絡電流Ｉ_Ry1と称する。）に基づいて変圧器５内部の短絡事故を検出すると、変圧器５の１次側のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と変圧器５の２次側のＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とを一括遮断する第１の電流差動継電器２０₁と、第２のストレート貫通変流器１０₂から入力される短絡電流と第４のストレート貫通変流器１０₄から入力される短絡電流との差電流（以下、「第２の短絡電流Ｉ_Ry2」と称する。）に基づいて変圧器５内部での短絡事故を検出すると、第１乃至第６の遮断器２₁〜２₆を一括遮断する第２の電流差動継電器２０₂とを具備する。 Next, a protective relay device according to a seventh embodiment of the present invention will be described with reference to FIG.
Protective relay apparatus according to this embodiment, as shown in FIG. 12, a first straight through current transformer 10 ₁ installed on the primary side of the transformer 5 is installed on the primary side of the transformer 5 The second straight through current transformer 10 ₂ , the third straight through current transformer 10 ₃ installed on the secondary side of the transformer 5, and the fourth straight current transformer 10 ₃ installed on the secondary side of the transformer 5. The difference between the short-circuit current input from the straight through current transformer 10 ₄ and the first straight through current transformer 10 ₁ and the short circuit current input from the third straight through current transformer 10 ₃ (hereinafter, “ When a short-circuit accident inside the transformer 5 is detected based on the first short-circuit current I _Ry1 ), the first to the first installed in the R-phase, S-phase, and T-phase on the primary side of the transformer 5 are detected. 3 of the circuit breaker 2 ₁ to 2 ₃ and the secondary side of the R-phase transformer 5, the fourth to respectively installed in S-phase and T-phase Breaker 2 _4-2 ₆ and the first current differential relay 20 ₁ for collectively blocking the short-circuit current and the fourth straight through current transformer 10 which is input from the second straight through current transformer 10 ₂ _When a short-circuit _{fault in} the transformer 5 is detected based on a difference current from the short-circuit current input from ₄ (hereinafter referred to as “second short-circuit current I _Ry2 ”), the first to sixth circuit breakers are detected. And a second current differential relay 20 ₂ that collectively cuts off 2 _{1 to} 2 ₆ .

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に変圧器５の１次側のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に変圧器５の１次側のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に変圧器５の２次側のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に変圧器５の２次側のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、変圧器５の１次側のＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、変圧器５の１次側のＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、変圧器５の２次側のＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、変圧器５の２次側のＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の極性方向に貫通されている。
また、第３のストレート貫通変流器１０₃は、第３のストレート貫通変流器１０₃から第１の電流差動継電器２０₁に入力される短絡電流の極性が第１のストレート貫通変流器１０₁から第１の電流差動継電器２０₁に入力される短絡電流の極性と逆となるように、第１の電流差動継電器２０₁に接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から第２の電流差動継電器２０₂に入力される短絡電流の極性が第２のストレート貫通変流器１０₂から第２の電流差動継電器２０₂に入力される短絡電流の極性と逆となるように、第２の電流差動継電器２０₂に接続されている。 The first straight through current transformer 10 _1, the secondary coil of the transformer 5 to an annular core formed by winding a primary side of the R-phase and S-phase feedthrough variable which is passed through straight in the same direction The second straight through current transformer 10 ₂ is a through which has the S-phase and T-phase on the primary side of the transformer 5 straightly penetrated in the same direction in the annular core wound with the secondary coil. The third straight through current transformer 10 ₃ is configured to allow the R-phase and S-phase on the secondary side of the transformer 5 to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S-phase and T-phase on the secondary side of the transformer 5 in the same direction on the annular core around which the secondary coil is wound. This is a through-type current transformer.
That is, the primary side of the R-phase and S-phase of the transformer 5 are both through the first straight through current transformer 10 _first polarity direction, S-phase and T-phase of the primary side of the transformer 5 Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase on the secondary side of the transformer 5 penetrate in the polarity direction of the third straight through current transformer 10 _3. Both the S phase and the T phase on the secondary side of the transformer 5 are penetrated in the polarity direction of the fourth straight through current transformer 10 ₄ .
Further, the third straight through current transformer 10 ₃ has the first straight through current transformer in which the polarity of the short-circuit current input from the _third straight through current transformer 10 ₃ to the first current differential relay 20 ₁ is the same. vessel 10 ₁ so as to be opposite to the polarity of the first current short-circuit current input to the differential relay 20 ₁ is connected to a first current differential relay 20 _1. Similarly, in the fourth straight through current transformer 10 ₄ , the polarity of the short-circuit current input from the _fourth straight through current transformer 10 ₄ to the second current differential relay 20 ₂ is the second straight through current transformer. The second current differential relay 20 ₂ is connected to the _second current differential relay 20 ₂ so as to be opposite in polarity to the short-circuit current input from the current collector 10 ₂ to the second current differential relay 20 ₂ .

したがって、変圧器５内部において短絡事故が発生していないときに変圧器５の１次側（送電端）のＲ相、Ｓ相およびＴ相に流れる１次負荷電流をＩ_1R，Ｉ_1S，Ｉ_1Tで表し、変圧器５の２次側（受電端）のＲ相、Ｓ相およびＴ相に流れる２次負荷電流をＩ_2R，Ｉ_2S，Ｉ_2Tで表すと、Ｒ相の１次負荷電流Ｉ_1RとＳ相の１次負荷電流Ｉ_1Sとは１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れ、Ｒ相の２次負荷電流Ｉ_2RとＳ相の２次負荷電流Ｉ_2Sとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れる（図１０参照）。
そのため、第１のストレート貫通変流器１０₁から第１の電流差動継電器２０₁に入力される第１の１次負荷電流ｉ₁₁はＲ相の１次負荷電流Ｉ_1RとＳ相の１次負荷電流Ｉ_1Sとのベクトル和となり、第１の１次負荷電流ｉ₁₁の振幅はＲ相の１次負荷電流Ｉ_1R（Ｓ相の１次負荷電流Ｉ_1S）の振幅となる。同様に、第３のストレート貫通変流器１０₃から第１の電流差動継電器２０₁に入力される第１の２次負荷電流ｉ₂₁はＲ相の２次負荷電流Ｉ_2RとＳ相の２次負荷電流Ｉ_2Sとのベクトル和（極性は負）となり、第１の２次負荷電流ｉ₂₁の振幅はＲ相の２次負荷電流Ｉ_2R（Ｓ相の２次負荷電流Ｉ_2S）の振幅となる。
ｉ₁₁＝Ｉ_1R＋Ｉ_1S
｜ｉ₁₁｜＝｜Ｉ_1R＋Ｉ_1S｜＝｜Ｉ_1R｜＝｜Ｉ_1S｜
ｉ₂₁＝−（Ｉ_2R＋Ｉ_2S）
｜ｉ₂₁｜＝｜Ｉ_2R＋Ｉ_2S｜＝｜Ｉ_2R｜＝｜Ｉ_2S｜
その結果、第１の電流差動継電器２０₁に入力される第１の負荷電流Ｉ₁は、第１の１次負荷電流ｉ₁₁と第１の２次負荷電流ｉ₂₁とのベクトル和で表され、第１の負荷電流Ｉ₁の振幅は“０”（｜Ｉ₁｜＝｜ｉ₁₁＋ｉ₂₁｜＝０）となる。
同様に、Ｓ相の１次負荷電流Ｉ_1SとＴ相の１次負荷電流Ｉ_1Tとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れ、Ｓ相の２次負荷電流Ｉ_2SとＴ相の２次負荷電流Ｉ_2Tとは１２０°の位相差で第４のストレート貫通変流器１０₄の環状鉄心を極性方向に貫通して流れる（図１０参照）。
そのため、第２のストレート貫通変流器１０₂から第２の電流差動継電器２０₂に入力される第２の１次負荷電流ｉ₁₂はＳ相の１次負荷電流Ｉ_1SとＴ相の１次負荷電流Ｉ_1Tとのベクトル和となり、第２の１次負荷電流ｉ₁₂の振幅はＳ相の１次負荷電流Ｉ_1S（Ｔ相の１次負荷電流Ｉ_1T）の振幅となる。同様に、第４のストレート貫通変流器１０₄から第２の電流差動継電器２０₂に入力される第２の２次負荷電流ｉ₂₂はＳ相の２次負荷電流Ｉ_2SとＴ相の２次負荷電流Ｉ_2Tとのベクトル和（極性は負）となり、第２の２次負荷電流ｉ₂₂の振幅はＳ相の２次負荷電流Ｉ_2S（Ｔ相の２次負荷電流Ｉ_2T）の振幅となる。
ｉ₁₂＝Ｉ_1S＋Ｉ_1T
｜ｉ₁₂｜＝｜Ｉ_1S＋Ｉ_1T｜＝｜Ｉ_1S｜＝｜Ｉ_1T｜
ｉ₂₂＝−（Ｉ_2S＋Ｉ_2T）
｜ｉ₂₂｜＝｜Ｉ_2S＋Ｉ_2T｜＝｜Ｉ_2S｜＝｜Ｉ_2T｜
その結果、第２の電流差動継電器２０₂に入力される第２の負荷電流Ｉ₂は、第２の１次負荷電流ｉ₁₂と第２の２次負荷電流ｉ₂₂とのベクトル和で表され、第２の負荷電流Ｉ₂の振幅は“０”（｜Ｉ₂｜＝｜ｉ₁₂＋ｉ₂₂｜＝０）となる。 Accordingly, the primary load currents flowing in the R-phase, S-phase, and T-phase on the primary side (transmission end) of the transformer 5 when the short-circuit accident does not occur inside the transformer 5 are I _1R , I _1S , I _{Expressed as 1T} and the secondary load current flowing in the R phase, S phase, and T phase on the secondary side (power receiving end) of the transformer 5 is expressed as I _2R , I _2S , I _2T , the primary load current of the R phase The I _1R and the S-phase primary load current I _1S flow in the polarity direction through the annular core of the first straight through current transformer 10 ₁ with a phase difference of 120 °, and the R-phase secondary load current I _{The 2R} and S-phase secondary load current I _2S flows through the annular core of the second straight through current transformer 10 _{2 in} the polarity direction with a phase difference of 120 ° (see FIG. 10).
Therefore, the first primary load current i ₁₁ primary load current I _1R and S phase of the R-phase inputted from the first straight through current transformer 10 ₁ to the first current differential relay 20 ₁ 1 It becomes a vector sum with the secondary load current I _1S, and the amplitude of the first primary load current i ₁₁ becomes the amplitude of the R-phase primary load current I _1R (S-phase primary load current I _1S ). Similarly, the third straight through current transformer 10 ₃ from the first secondary load current i ₂₁ the secondary load current I _2R and S phase of the R-phase input to the first current differential relay 20 ₁ It becomes a vector sum (negative polarity) with the secondary load current I _2S, and the amplitude of the first secondary load current i ₂₁ is the R-phase secondary load current I _2R (S-phase secondary load current I _2S ). Amplitude.
i ₁₁ = I _1R + I _1S
| I ₁₁ | = | I _1R + I _1S | = | I _1R | = | I _1S |
i ₂₁ = − (I _2R + I _2S )
| I ₂₁ | = | I _2R + I _2S | = | I _2R | = | I _2S |
Table In result, the first load current I ₁ is input to the first current differential relay 20 _1, the vector sum of the first primary load currents i ₁₁ and the first secondary load current i ₂₁ Thus, the amplitude of the first load current I ₁ is “0” (| I ₁ | = | i ₁₁ + i ₂₁ | = 0).
Similarly, the S-phase primary load current I _1S and the T-phase primary load current I _1T pass through the annular core of the second straight through current transformer 10 _{2 in} the polarity direction with a phase difference of 120 °. The S-phase secondary load current I _2S and the T-phase secondary load current I _2T flow through the annular core of the fourth straight through current transformer 10 _{4 in} the polarity direction with a phase difference of 120 °. (See FIG. 10).
Therefore, the second primary load current i ₁₂ input from the second straight through current transformer 10 ₂ to the second current differential relay 20 ₂ is the S-phase primary load current I _1S and the T-phase 1 It becomes a vector sum with the secondary load current I _1T, and the amplitude of the second primary load current i ₁₂ becomes the amplitude of the S-phase primary load current I _1S (T-phase primary load current I _1T ). Similarly, the second secondary load current i ₂₂ input from the _fourth straight through current transformer 10 ₄ to the second current differential relay 20 ₂ is the S-phase secondary load current I _2S and the T-phase current. It becomes a vector sum (negative polarity) with the secondary load current I _2T, and the amplitude of the second secondary load current i ₂₂ is the S-phase secondary load current I _2S (T-phase secondary load current I _2T ). Amplitude.
i ₁₂ = I _1S + I _1T
| I ₁₂ | = | I _1S + I _1T | = | I _1S | = | I _1T |
i ₂₂ = − (I _2S + I _2T )
| I ₂₂ | = | I _2S + I _2T | = | I _2S | = | I _2T |
As a result, the second load current I ₂ input to the second current differential relay 20 ₂ is expressed as a vector sum of the second primary load current i ₁₂ and the second secondary load current i _22. Thus, the amplitude of the second load current I ₂ becomes “0” (| I ₂ | = | i ₁₂ + i ₂₂ | = 0).

また、たとえば変圧器５内部の１次側において短絡事故が発生したときに変圧器５の１次側のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、第１の短絡電流Ｉ_Ry1（第１のストレート貫通変流器１０₁から入力される短絡電流と第３のストレート貫通変流器１０₃から入力される短絡電流との差電流）と第２の短絡電流Ｉ_Ry2（第２のストレート貫通変流器１０₂から入力される短絡電流と第４のストレート貫通変流器１０₄から入力される短絡電流との差電流）とは、上述した第６の実施例による第１および第２の過電流継電器４₁，４₂における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS＝０
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝０
Ｉ_Ry2＝Ｉ_FS
｜Ｉ_Ry2｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT＝０
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝０
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR
｜Ｉ_Ry1｜＝｜Ｉ_FR｜
Ｉ_Ry2＝Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜ For example, when a short circuit accident occurs on the primary side in the transformer 5, the short circuit currents flowing in the R phase, S phase, and T phase on the primary side of the transformer 5 are represented by I _FR , I _FS , and I _FT . And the first short-circuit current I _Ry1 (the difference between the short-circuit current input from the first straight through current transformer 10 ₁ and the short-circuit current input from the third straight through current transformer 10 ₃ ) and the first The short circuit current I _{Ry2 of 2} (the difference current between the short circuit current input from the second straight through current transformer 10 ₂ and the short circuit current input from the fourth straight through current transformer 10 ₄ ) is described above. In the same manner as in the first and second overcurrent relays 4 ₁ and 4 ₂ according to the sixth embodiment, the following is expressed according to the accident aspect.
(1) In case of short circuit between R phase and S phase I _Ry1 = I _FR + I _FS = 0
| I _Ry1 | = | I _FR + I _FS | = 0
I _Ry2 = I _FS
| I _Ry2 | = | I _FS |
(2) In the case of a short circuit between S phase and T phase I _Ry1 = I _FS
| I _Ry1 | = | I _FS |
I _Ry2 = I _FS + I _FT = 0
| I _Ry2 | = | I _FS + I _FT | = 0
(3) In case of short circuit between T phase and R phase I _Ry1 = I _FR
｜ I _Ry1 ｜＝｜ I _FR ｜
I _Ry2 = I _FT
| I _Ry2 | = | I _FT |
(4) In case of short circuit between R phase, S phase and T phase I _Ry1 = I _FR + I _FS
| I _Ry1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
I _Ry2 = I _FS + I _FT
| I _Ry2 | = | I _FS + I _FT | = | I _FS | = | I _FT |

第１の電流差動継電器２０₁は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、変圧器５内部において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。
また、第２の電流差動継電器２０₂は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、変圧器５内部において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 First current differential relay 20 _1, when the amplitude of the first short-circuit current I _Ry1 exceeds the current setting value, it is determined that the short-circuit failure occurs inside the transformer 5, first to 6 breakers 2 ₁ to 2 ₆ are shut off at _once .
The second current differential relay 20 _2, when the amplitude of the second short-circuit current I _Ry2 exceeds the current setting value, it is determined that the short-circuit failure occurs inside the transformer 5, a first to collectively block the circuit breaker 2 ₁ to 2 ₆ sixth.

なお、変圧器５の１次側のＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いたが、変圧器５の１次側のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよいし、変圧器５の１次側のＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と変圧器５の１次側のＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよい。
第３および第４のストレート貫通変流器１０₃，１０₄についても同様である。 Incidentally, S-phase and T-phase of the primary side first straight through current transformer 10 ₁ a transformer 5 to R-phase and S-phase of the primary side of the transformer 5 is penetrating straight is through straight and a second straight through current transformer 10 ₂ and was used, the transformer 5 on the primary side of the R-phase and T-phase first straight through current transformer 10 ₁ a transformer which is penetrating straight 5 of it may be used S-phase and T-phase of the primary side and a second straight through current transformer 10 ₂ passing through in the straight, the primary side of the R-phase and T-phase of the transformer 5 is straight the first straight through may be used current transformer 10 ₁ and a straight through current transformer 10 ₂ second to R-phase and S-phase is through the straight of the primary transformer 5 which is penetrated.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ .

次に、本発明の第８の実施例による保護継電装置について、図１３を参照して説明する。
本実施例による保護継電装置は、構内における短絡事故から第１および第２の送配電線１Ｌ，２Ｌを保護するための受電保護継電装置であり、図１３に示すように、母線から分岐された第１の送配電線１Ｌに設置された第１のストレート貫通変流器１０₁と、第１の送配電線１Ｌに設置された第２のストレート貫通変流器１０₂と、母線から分岐された第２の送配電線２Ｌに設置された第３のストレート貫通変流器１０₃と、第２の送配電線２Ｌに設置された第４のストレート貫通変流器１０₄と、第１のストレート貫通変流器１０₁から入力される短絡電流と第３のストレート貫通変流器１０₃から入力される短絡電流の和電流（以下、「第１の短絡電流Ｉ_Ry1」と称する。）に基づいて構内での短絡事故を検出すると、第１の送配電線１ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と第２の送配電線２ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とを一括遮断する第１の過電流継電器３０₁と、第２のストレート貫通変流器１０₂から入力される短絡電流と第４のストレート貫通変流器１０₄から入力される短絡電流との和電流（以下、「第２の短絡電流Ｉ_Ry2」と称する。）に基づいて構内での短絡事故を検出すると、第１乃至第６の遮断器２₁〜２₆を一括遮断する第２の過電流継電器３０₂とを具備する。 Next, a protective relay device according to an eighth embodiment of the present invention will be described with reference to FIG.
The protection relay device according to the present embodiment is a power reception protection relay device for protecting the first and second transmission / distribution lines 1L and 2L from a short circuit accident on the premises, and is branched from the bus as shown in FIG. From the first straight through current transformer 10 ₁ installed in the first transmission and distribution line 1L, the second straight through current transformer 10 ₂ installed in the first transmission and distribution line 1L, and the bus A third straight through current transformer 10 ₃ installed in the branched second transmission and distribution line 2L; a fourth straight through current transformer 10 ₄ installed in the second transmission and distribution line 2L; The sum of the short-circuit current input from the first straight through current transformer 10 ₁ and the short-circuit current input from the third straight through current transformer 10 ₃ (hereinafter referred to as “first short-circuit current I _Ry1 ”). ) To detect a short circuit accident on the premises, Phase, S phase and the first to third circuit breaker 2 ₁ to 2 ₃ to R-phase of the second transmission and distribution lines 2L disposed respectively on T-phase, the fourth to respectively installed in S-phase and T-phase sixth first overcurrent relay 30 ₁ for collectively blocking the circuit breaker 2 _4-2 _6, the second straight through current transformer 10 short-circuit current which is input from the ₂ and the fourth straight through current transformer When a short circuit _fault is detected on the premises based on the sum current with the short circuit current input from 10 ₄ (hereinafter referred to as “second short circuit current I _Ry2 ”), the first to sixth circuit breakers 2 ₁ ~ 2 ₆ comprises a second overcurrent relay 30 ₂ for collectively blocking.

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、第１の送配電線１ＬのＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、第１の送配電線１ＬのＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、第２の送配電線２ＬのＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、第２の送配電線２ＬのＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の極性方向に貫通されている。 The first straight through current transformer 10 _1, the first transmission and distribution lines 1L R phase and S phase through type variable that is passed through straight in the same direction of the secondary coil in an annular core formed by winding a flow device, a second straight through current transformer 10 ₂ has a circular core formed by winding a secondary coil is passed through the S-phase and T-phase of the first transmission and distribution lines 1L straight in the same direction through The third straight through current transformer 10 ₃ allows the R-phase and S-phase of the second power transmission and distribution line 2L to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S phase and the T phase of the second power transmission / distribution line 2L in the same direction around the annular core wound with the secondary coil. This is a penetrating through-type current transformer.
Ie, R-phase and S-phase of the first transmission and distribution lines 1L are both through the first polarity direction straight through current transformer 10 _1, S-phase and T-phase of the first transmission and distribution lines. 1L Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase of the second transmission and distribution line 2L penetrate in the polarity direction of the third straight through current transformer 10 _3. The S phase and the T phase of the second transmission / distribution line 2L are both penetrated in the polarity direction of the fourth straight through current transformer 10 ₄ .

したがって、構内において短絡事故が発生していないときに第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、Ｒ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとが１２０°の位相差で第１および第３のストレート貫通変流器１０₁，１０₃の環状鉄心を極性方向に貫通して流れるため（図１０参照）、第１および第３のストレート貫通変流器１０₁，１０₃から第１の過電流継電器３０₁に入力される第１の負荷電流Ｉ₁はＲ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとのベクトル和となり、第１の負荷電流Ｉ₁の振幅はＲ相の負荷電流Ｉ_R（Ｓ相の負荷電流Ｉ_S）の振幅となる。
Ｉ₁＝Ｉ_R＋Ｉ_S
｜Ｉ₁｜＝｜Ｉ_R＋Ｉ_S｜＝｜Ｉ_R｜＝｜Ｉ_S｜
同様に、Ｓ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとが１２０°の位相差で第２および第４のストレート貫通変流器１０₂，１０₄の環状鉄心を極性方向に貫通して流れるため（図１０参照）、第２および第４のストレート貫通変流器１０₂，１０₄から第２の過電流継電器３０₂に入力される第２の負荷電流Ｉ₂はＳ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとのベクトル和となり、第２の負荷電流Ｉ₂の振幅はＳ相の負荷電流Ｉ_S（Ｔ相の負荷電流Ｉ_T）の振幅となる。
Ｉ₂＝Ｉ_S＋Ｉ_T
｜Ｉ₂｜＝｜Ｉ_S＋Ｉ_T｜＝｜Ｉ_S｜＝｜Ｉ_T｜ Therefore, when the short-circuit accident does not occur on the premises, the load currents flowing in the R-phase, S-phase, and T-phase of the first and second transmission / distribution lines 1L, 2L are represented by I _R , I _S , I _T The R-phase load current I _R and the S-phase load current I _S pass through the annular cores of the first and third straight through current transformers 10 ₁ and 10 _{3 in} the polar direction with a phase difference of 120 °. flows for (see FIG. 10), the first load current I ₁ is the R-phase load current from the first and third straight through current transformer 10 _1, 10 ₃ are input first to the overcurrent relay 30 ₁ The vector sum of I _R and the S-phase load current I _S is obtained, and the amplitude of the _first load current I _{1 is} the amplitude of the R-phase load current I _R (S-phase load current I _S ).
I ₁ = I _R + I _S
| I ₁ | = | I _R + I _S | = | I _R | = | I _S |
Similarly, the S-phase load current I _S and the T-phase load current I _T pass through the annular cores of the second and fourth straight through current transformers 10 ₂ and 10 _{4 in} the polar direction with a phase difference of 120 °. Therefore, the second load current I ₂ input to the second overcurrent relay 30 ₂ from the second and fourth straight through current transformers 10 ₂ and 10 ₄ is S-phase. The vector sum of the load current I _S and the T-phase load current I _T is obtained, and the amplitude of the _second load current I _{2 is} the amplitude of the S-phase load current I _S (T-phase load current I _T ).
I ₂ = I _S + I _T
| I ₂ | = | I _S + I _T | = | I _S | = | I _T |

また、構内において短絡事故が発生したときに第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、第１の短絡電流Ｉ_Ry1（第１のストレート貫通変流器１０₁から入力される短絡電流と第３のストレート貫通変流器１０₃から入力される短絡電流との和電流）と第２の短絡電流Ｉ_Ry2（第２のストレート貫通変流器１０₂から入力される短絡電流と第４のストレート貫通変流器１０₄から入力される短絡電流との和電流）とは、上述した第６の実施例による第１および第２の過電流継電器４₁，４₂における場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS＝０
｜Ｉ_Ry1｜=｜Ｉ_FR＋Ｉ_FS｜＝０
Ｉ_Ry2＝Ｉ_FS
｜Ｉ_Ry2｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT＝０
｜Ｉ_Ry2｜=｜Ｉ_FS＋Ｉ_FT｜＝０
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR
｜Ｉ_Ry1｜＝｜Ｉ_FR｜
Ｉ_Ry2＝Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS
｜Ｉ_Ry1｜=｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT
｜Ｉ_Ry2｜=｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜ In addition, when a short circuit accident occurs on the premises, the short circuit currents flowing in the R phase, S phase, and T phase of the first and second transmission lines 1L, 2L are expressed as I _FR , I _FS , I _FT 1 short circuit current I _Ry1 (the sum of the short circuit current input from the first straight through current transformer 10 ₁ and the short circuit current input from the third straight through current transformer 10 ₃ ) and the second short circuit The current I _Ry2 (the sum of the short-circuit current input from the second straight through current transformer 10 ₂ and the short-circuit current input from the fourth straight through current transformer 10 ₄ ) is the above-described sixth current. In the same manner as in the first and second overcurrent relays 4 ₁ and 4 ₂ according to the embodiment, the following is expressed according to the accident aspect.
(1) In case of short circuit between R phase and S phase I _Ry1 = I _FR + I _FS = 0
| I _Ry1 | = | I _FR + I _FS | = 0
I _Ry2 = I _FS
| I _Ry2 | = | I _FS |
(2) In the case of a short circuit between S phase and T phase I _Ry1 = I _FS
| I _Ry1 | = | I _FS |
I _Ry2 = I _FS + I _FT = 0
| I _Ry2 | = | I _FS + I _FT | = 0
(3) In case of short circuit between T phase and R phase I _Ry1 = I _FR
｜ I _Ry1 ｜＝｜ I _FR ｜
I _Ry2 = I _FT
| I _Ry2 | = | I _FT |
(4) In case of short circuit between R phase, S phase and T phase I _Ry1 = I _FR + I _FS
| I _Ry1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
I _Ry2 = I _FS + I _FT
| I _Ry2 | = | I _FS + I _FT | = | I _FS | = | I _FT |

第１の過電流継電器３０₁は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。
また、第２の過電流継電器３０₂は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 First over current relay 30 _1, when the amplitude of the first short-circuit current I _Ry1 exceeds the current setting value, it is determined that the short-circuit failure in premises occurs, the circuit breaker of the first to sixth Blocks 2 _{1 to} 2 ₆ at _once .
The second overcurrent relay 30 ₂ determines that a short-circuit accident has occurred on the premises when the amplitude of the second short-circuit current I _Ry2 exceeds the current settling value, and the first to sixth relays Break breakers 2 _{1 to} 2 ₆ at _once .

なお、第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いたが、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよいし、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよい。
第３および第４のストレート貫通変流器１０₃，１０₄についても同様である。 Incidentally, S-phase and T-phase of the first transmission and distribution lines 1L of R phase and the first straight through current transformer 10 ₁ in the first transmission and distribution lines 1L of S phase is penetrating straight is through straight was used and a second straight through current transformer 10 _2, but the first straight through current transformer 10 ₁ and first to R-phase and T-phase of the first transmission and distribution lines 1L is penetrating straight S-phase and T-phase may be used a second straight through current transformer 10 ₂ passing through in the straight transmission and distribution lines 1L, the R-phase and T-phase of the first transmission and distribution lines 1L is straight the first straight through current transformer 10 ₁ and a straight through current transformer 10 ₂ second to R-phase and S-phase is through the straight first transmission and distribution lines 1L which is penetrated may be used.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ .

次に、本発明の第９の実施例による保護継電装置について、図１４を参照して説明する。
本実施例による保護継電装置は、構内における短絡事故から第１および第２の送配電線１Ｌ，２Ｌを保護するための分割受電保護継電装置であり、図１４に示すように、第１の母線から分岐された第１の送配電線１Ｌに設置された第１のストレート貫通変流器１０₁と、第１の送配電線１Ｌに設置された第２のストレート貫通変流器１０₂と、第２の母線から分岐された第２の送配電線２Ｌに設置された第３のストレート貫通変流器１０₃と、第２の送配電線２Ｌに設置された第４のストレート貫通変流器１０₄と、第１の母線に設置された第５のストレート貫通変流器１０₅と、第１の母線に設置された第６のストレート貫通変流器１０₆と、第１のストレート貫通変流器１０₁から入力される短絡電流と第５のストレート貫通変流器１０₅から入力される短絡電流との差電流（以下、「第１の短絡電流Ｉ_Ry1」と称する。）に基づいて構内での短絡事故を検出すると、第１の送配電線１ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と第１および第２の母線のＲ相、Ｓ相およびＴ相の間にそれぞれ設置された第７乃至第９の遮断器２₇〜２₉（母線連絡遮断器）とを一括遮断する第１の過電流継電器４０₁と、第３のストレート貫通変流器１０₃から入力される短絡電流と第５のストレート貫通変流器１０₅から入力される短絡電流との差電流（以下、「第１の短絡電流Ｉ_Ry1」と称する。）に基づいて構内での短絡事故を検出すると、第２の送配電線２ＬのＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆と第７乃至第９の遮断器２₇〜２₉とを一括遮断する第２の過電流継電器４０₂と、第２のストレート貫通変流器１０₂から入力される短絡電流と第６のストレート貫通変流器１０₆から入力される短絡電流との差電流（以下、「第２の短絡電流Ｉ_Ry2」と称する。）に基づいて構内での短絡事故を検出すると、第１乃至第３の遮断器２₁〜２₃と第７乃至第９の遮断器２₇〜２₉とを一括遮断する第３の過電流継電器４０₃と、第４のストレート貫通変流器１０₄から入力される短絡電流と第６のストレート貫通変流器１０₆から入力される短絡電流との差電流（以下、「第２の短絡電流Ｉ_Ry2」と称する。）に基づいて構内での短絡事故を検出すると、第４乃至第６の遮断器２₄〜２₆と第７乃至第９の遮断器２₇〜２₉とを一括遮断する第４の過電流継電器４０₄とを具備する。 Next, a protective relay device according to a ninth embodiment of the present invention will be described with reference to FIG.
The protective relay device according to the present embodiment is a split power receiving protective relay device for protecting the first and second power transmission / distribution lines 1L and 2L from a short circuit accident in the premises. As shown in FIG. The first straight through current transformer 10 ₁ installed in the first transmission / distribution line 1L branched from the first bus and the second straight through current transformer 10 ₂ installed in the first transmission / distribution line 1L. A third straight through current transformer 10 ₃ installed in the second transmission / distribution line 2L branched from the second bus, and a fourth straight through transformation module installed in the second transmission / distribution line 2L. and Nagareki 10 _4, and a fifth straight through current transformer 10 ₅ installed in the first busbar, the straight through current transformer ₁₀₆ of the sixth installed in the first busbar, the first straight From the short-circuit current input from the through current transformer 10 ₁ and the fifth straight through current transformer 10 ₅ When a short-circuit accident in the premises is detected based on a difference current from the input short-circuit current (hereinafter referred to as “first short-circuit current I _Ry1 ”), the R-phase and S-phase of the first transmission and distribution line 1L 7 to 9 installed between the _first to _third circuit breakers 2 ₁ to 2 ₃ installed in the T phase and the T phase, respectively, and the R phase, S phase and T phase of the first and second bus bars, respectively. first overcurrent relay 40 _1, third short circuit current input from straight through current transformer ₁₀₃ of the fifth straight collectively disconnect the circuit breaker 2 _7-2 ₉ (busbar breaker) of When a short-circuit accident in the premises is detected based on a difference current from the short-circuit current input from the feedthrough current transformer 10 ₅ (hereinafter referred to as “first short-circuit current I _Ry1 ”), the second transmission / distribution line 2L of R phase, S phase and the fourth to sixth breaker installed respectively on T phase 2 _4-2 ₆ and the seventh to ninth Breaker 2 _7-2 ₉ and the second over current relay 40 ₂ for collectively blocking the from straight through current transformer ₁₀₆ of the second short-circuit current input from straight through current transformer 10 ₂ and the 6 When a short circuit accident is detected on the premises based on the difference current from the input short circuit current (hereinafter referred to as “second short circuit current I _Ry2 ”), the _first to _third circuit breakers 2 ₁ to 2 ₃ are detected. When the third overcurrent relay 40 _3, short-circuit current and the sixth straight inputted from the fourth straight through current transformer ₁₀₄ for collectively blocking the circuit breaker 2 _7-2 ₉ of the seventh to ninth When a short-circuit accident in the premises is detected based on a difference current from the short-circuit current input from the feedthrough current transformer 10 ₆ (hereinafter referred to as “second short-circuit current I _Ry2 ”), the fourth to sixth A fourth overcurrent relay 40 that collectively cuts off the circuit breakers 2 _{4 to} 2 ₆ and the _seventh to _ninth circuit breakers 2 ₇ to 2 _9. _{And 4} .

ここで、第１のストレート貫通変流器１０₁は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２のストレート貫通変流器１０₂は、２次コイルを巻装した環状鉄心に第１の送配電線１ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第３のストレート貫通変流器１０₃は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第４のストレート貫通変流器１０₄は、２次コイルを巻装した環状鉄心に第２の送配電線２ＬのＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器であり、第５のストレート貫通変流器１０₅は、２次コイルを巻装した環状鉄心に第１の母線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第６のストレート貫通変流器１０₆は、２次コイルを巻装した環状鉄心に第１の母線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、第１の送配電線１ＬのＲ相およびＳ相はともに第１のストレート貫通変流器１０₁の極性方向に貫通されており、第１の送配電線１ＬのＳ相およびＴ相はともに第２のストレート貫通変流器１０₂の極性方向に貫通されており、第２の送配電線２ＬのＲ相およびＳ相はともに第３のストレート貫通変流器１０₃の極性方向に貫通されており、第２の送配電線２ＬのＳ相およびＴ相はともに第４のストレート貫通変流器１０₄の極性方向に貫通されており、第１の母線のＲ相およびＳ相はともに第５のストレート貫通変流器１０₅の極性方向に貫通されており、第１の母線のＳ相およびＴ相はともに第６のストレート貫通変流器１０₆の極性方向に貫通されている。 The first straight through current transformer 10 _1, the first transmission and distribution lines 1L R phase and S phase through type variable that is passed through straight in the same direction of the secondary coil in an annular core formed by winding a flow device, a second straight through current transformer 10 ₂ has a circular core formed by winding a secondary coil is passed through the S-phase and T-phase of the first transmission and distribution lines 1L straight in the same direction through The third straight through current transformer 10 ₃ allows the R-phase and S-phase of the second power transmission and distribution line 2L to pass straight through in the same direction through the annular core wound with the secondary coil. The fourth straight through current transformer 10 ₄ is configured to straighten the S phase and the T phase of the second power transmission / distribution line 2L in the same direction around the annular core wound with the secondary coil. The fifth straight through current transformer 10 ₅ is a secondary coil. Is a through-type current transformer in which the R-phase and S-phase of the first bus are straightly penetrated in the same direction through a ring-shaped iron core wound with a 6-straight through-current transformer 10 _6. This is a through-type current transformer in which an S-phase and a T-phase of a first bus bar are straightly penetrated in the same direction through a wound annular iron core.
Ie, R-phase and S-phase of the first transmission and distribution lines 1L are both through the first polarity direction straight through current transformer 10 _1, S-phase and T-phase of the first transmission and distribution lines. 1L Both are penetrated in the polarity direction of the second straight through current transformer 10 ₂ , and both the R phase and S phase of the second transmission and distribution line 2L penetrate in the polarity direction of the third straight through current transformer 10 _3. are, S-phase and T-phase of the second transmission and distribution lines 2L are both through to the fourth straight through current transformer ₁₀₄ polarity direction, R-phase and S-phase of the first busbar together The fifth straight through current transformer 10 ₅ is penetrated in the polarity direction, and the S phase and the T phase of the first bus are both penetrated in the polar direction of the sixth straight through current transformer 10 ₆ .

したがって、構内において短絡事故が発生していないときに第１および第２の母線と第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる負荷電流をＩ_R，Ｉ_S，Ｉ_Tで表すと、Ｒ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとが１２０°の位相差で第１、第３および第５のストレート貫通変流器１０₁，１０₃，１０₅の環状鉄心を極性方向に貫通して流れるため（図１０参照）、第１、第３および第５のストレート貫通変流器１０₁，１０₃，１０₅から第１および第２の過電流継電器３０₁，３０₂に入力される第１の負荷電流Ｉ₁はＲ相の負荷電流Ｉ_RとＳ相の負荷電流Ｉ_Sとのベクトル和となり、第１の負荷電流Ｉ₁の振幅はＲ相の負荷電流Ｉ_R（Ｓ相の負荷電流Ｉ_S）の振幅となる。
Ｉ₁＝Ｉ_R＋Ｉ_S
｜Ｉ₁｜＝｜Ｉ_R＋Ｉ_S｜＝｜Ｉ_R｜＝｜Ｉ_S｜
同様に、Ｓ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとが１２０°の位相差で第２、第４および第６のストレート貫通変流器１０₂，１０₄，１０₆の環状鉄心を極性方向に貫通して流れるため（図１０参照）、第２、第４および第６のストレート貫通変流器１０₂，１０₄，１０₆から第３および第４の過電流継電器３０₃，１０₄に入力される第２の負荷電流Ｉ₂はＳ相の負荷電流Ｉ_SとＴ相の負荷電流Ｉ_Tとのベクトル和となり、第２の負荷電流Ｉ₂の振幅はＳ相の負荷電流Ｉ_S（Ｔ相の負荷電流Ｉ_T）の振幅となる。
Ｉ₂＝Ｉ_S＋Ｉ_T
｜Ｉ₂｜＝｜Ｉ_S＋Ｉ_T｜＝｜Ｉ_S｜＝｜Ｉ_T｜ Thus, the first and second bus and the first and second transmission and distribution lines 1L when a short-circuit accident in the premises does not occur, R-phase of 2L, a load current flowing through the S-phase and T-phase I _R, Expressed as I _S and I _T , the first, third, and fifth straight through current transformers 10 ₁ , 10 have a phase difference of 120 ° between the R-phase load current I _R and the S-phase load current I _S. ₃ , 10 ₅ to penetrate through the annular cores in the polar direction (see FIG. 10), the first, second and third straight through current transformers 10 ₁ , 10 ₃ , 10 ₅ to the first and second The first load current I ₁ input to the overcurrent relays 30 ₁ and 30 ₂ is a vector sum of the R-phase load current I _R and the S-phase load current I _S, and the first load current I ₁ The amplitude is the amplitude of the R-phase load current I _R (S-phase load current I _S ).
I ₁ = I _R + I _S
| I ₁ | = | I _R + I _S | = | I _R | = | I _S |
Similarly, the second, fourth, and sixth straight through current transformers 10 ₂ , 10 ₄ , 10 _{6 have} an annular shape with a phase difference of 120 ° between the S-phase load current I _S and the T-phase load current I _T. In order to flow through the iron core in the polarity direction (see FIG. 10), the second, fourth, and sixth straight through current transformers 10 ₂ , 10 ₄ , 10 ₆ to the third and fourth overcurrent relays 30 ₃ , the second load current I ₂ that is input to 10 ₄ become vector sum of the load current I _T of the load current I _S and T phases of the S-phase, second amplitude of the load current I ₂ is the load of the S-phase It becomes the amplitude of the current I _S (T-phase load current I _T ).
I ₂ = I _S + I _T
| I ₂ | = | I _S + I _T | = | I _S | = | I _T |

また、構内において短絡事故が発生したときに第１および第２の母線と第１および第２の送配電線１Ｌ，２ＬのＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、第１の短絡電流Ｉ_Ry1（第１のストレート貫通変流器１０₁から入力される短絡電流と第５のストレート貫通変流器１０₅から入力される短絡電流との差電流、および第３のストレート貫通変流器１０₃から入力される短絡電流と第５のストレート貫通変流器１０₅から入力される短絡電流との差電流）と第２の短絡電流Ｉ_Ry2（第２のストレート貫通変流器１０₂から入力される短絡電流と第６のストレート貫通変流器１０₆から入力される短絡電流との差電流、および第４のストレート貫通変流器１０₄から入力される短絡電流と第６のストレート貫通変流器１０₆から入力される短絡電流との差電流）は、上述した第６の実施例による第１および第２の過電流継電器４₁，４₂の場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS＝０
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝０
Ｉ_Ry2＝Ｉ_FS
｜Ｉ_Ry2｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT＝０
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝０
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR
｜Ｉ_Ry1｜＝｜Ｉ_FR｜
Ｉ_Ry2＝Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜ Further, when a short circuit accident occurs on the premises, the short circuit currents flowing in the R phase, S phase and T phase of the first and second buses and the first and second transmission and distribution lines 1L and 2L are represented by I _FR and I _FS. , expressed in I _FT, the first short-circuit current I _Ry1 (first short-circuit current which is inputted from the straight through current transformer 10 ₁ and short-circuit current which is inputted from the straight through current transformer ₁₀₅ of the fifth Difference current and the difference between the short-circuit current input from the third straight through current transformer 10 ₃ and the short-circuit current input from the fifth straight through current transformer 10 ₅ ) and the second short-circuit current I _Ry2 (The difference between the short-circuit current input from the second straight through current transformer 10 ₂ and the short-circuit current input from the sixth straight through current transformer 10 ₆ , and the fourth straight through current transformer 10 ₄ Short-circuit current and 6th straight through current transformer 0 differential current) between the short-circuit current input from _6, as in the case of the 6 first and second overcurrent relay according to Example 4 _1, 4 ₂ described above, the following in response to an accident appearance It is expressed as
(1) In case of short circuit between R phase and S phase I _Ry1 = I _FR + I _FS = 0
| I _Ry1 | = | I _FR + I _FS | = 0
I _Ry2 = I _FS
| I _Ry2 | = | I _FS |
(2) In the case of a short circuit between S phase and T phase I _Ry1 = I _FS
| I _Ry1 | = | I _FS |
I _Ry2 = I _FS + I _FT = 0
| I _Ry2 | = | I _FS + I _FT | = 0
(3) In case of short circuit between T phase and R phase I _Ry1 = I _FR
｜ I _Ry1 ｜＝｜ I _FR ｜
I _Ry2 = I _FT
| I _Ry2 | = | I _FT |
(4) In case of short circuit between R phase, S phase and T phase I _Ry1 = I _FR + I _FS
| I _Ry1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
I _Ry2 = I _FS + I _FT
| I _Ry2 | = | I _FS + I _FT | = | I _FS | = | I _FT |

第１の過電流継電器４０₁は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃と第７乃至第９の遮断器２₇〜２₉とを一括遮断し、第２の過電流継電器４０₂は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第４乃至第６の遮断器２₄〜２₆と第７乃至第９の遮断器２₇〜２₉とを一括遮断する。
また、第３の過電流継電器４０₃は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第１乃至第３の遮断器２₁〜２₃と第７乃至第９の遮断器２₇〜２₉とを一括遮断し、第４の過電流継電器４０₄は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、構内において短絡事故が発生したと判定して、第４乃至第６の遮断器２₄〜２₆と第７乃至第９の遮断器２₇〜２₉とを一括遮断する。 First over current relay 40 _1, when the amplitude of the first short-circuit current I _Ry1 exceeds the current setting value, it is determined that the short-circuit failure in premises occurs, first to third circuit breaker and 2 ₁ to 2 ₃ to the circuit breaker 2 _7-2 ₉ of the seventh to ninth batch cutoff, the second over current relay 40 _2, the amplitude of the first short-circuit current I _Ry1 exceeds a current setting value In this case, it is determined that a short circuit accident has occurred on the premises, and the _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ and the _seventh to _ninth circuit breakers 2 ₇ to 2 ₉ are collectively disconnected.
The third overcurrent relay 40 ₃ determines that a short-circuit accident has occurred in the premises when the amplitude of the second short-circuit current I _Ry2 exceeds the current settling value, and the first to third The circuit breakers 2 _{1 to} 2 ₃ and the seventh to _ninth circuit breakers 2 ₇ to 2 ₉ are collectively disconnected, and the fourth overcurrent relay 40 ₄ is configured such that the amplitude of the second short-circuit current I _Ry2 is a current set value. If it exceeds the limit, it is determined that a short circuit accident has occurred on the premises, and the _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ and the _seventh to _ninth circuit breakers 2 ₇ to 2 ₉ are collectively disconnected. To do.

なお、第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いたが、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＳ相およびＴ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよいし、第１の送配電線１ＬのＲ相およびＴ相がストレートに貫通された第１のストレート貫通変流器１０₁と第１の送配電線１ＬのＲ相およびＳ相がストレートに貫通された第２のストレート貫通変流器１０₂とを用いてもよい。
第３および第４のストレート貫通変流器１０₃，１０₄と第５および第６のストレート貫通変流器１０₅，１０₆とについても同様である。 Incidentally, S-phase and T-phase of the first transmission and distribution lines 1L of R phase and the first straight through current transformer 10 ₁ in the first transmission and distribution lines 1L of S phase is penetrating straight is through straight was used and a second straight through current transformer 10 _2, but the first straight through current transformer 10 ₁ and first to R-phase and T-phase of the first transmission and distribution lines 1L is penetrating straight S-phase and T-phase may be used a second straight through current transformer 10 ₂ passing through in the straight transmission and distribution lines 1L, the R-phase and T-phase of the first transmission and distribution lines 1L is straight the first straight through current transformer 10 ₁ and a straight through current transformer 10 ₂ second to R-phase and S-phase is through the straight first transmission and distribution lines 1L which is penetrated may be used.
The same applies to the third and fourth straight through current transformers 10 ₃ and 10 ₄ and the fifth and sixth straight through current transformers 10 ₅ and 10 ₆ .

次に、本発明の第１０の実施例による保護継電装置について、図１５を参照して説明する。
本実施例による保護継電装置は、図１５に示すように、電源端母線側の送配電線に設置された第１のストレート貫通変流器１０₁と、電源端母線側の送配電線に設置された第２のストレート貫通変流器１０₂と、受電端母線側の送配電線に設置された第３のストレート貫通変流器１０₃と、受電端母線側の送配電線に設置された第４のストレート貫通変流器１０₄と、第１のストレート貫通変流器１０₁からの短絡電流と第３のストレート貫通変流器１０₃からの短絡電流との差電流（以下、「第１の短絡電流Ｉ_Ry1」と称する。）に基づいて送配電線における短絡事故を検出すると、電源端母線側の送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第１乃至第３の遮断器２₁〜２₃と受電端母線側の送配電線のＲ相、Ｓ相およびＴ相にそれぞれ設置された第４乃至第６の遮断器２₄〜２₆とをそれぞれ一括遮断する第１および第２のパルス符号変調電流差動継電器６０₁，６０₂（以下、「第１および第２のＰＣＭ電流差動継電器６０₁，６０₂」と称する。）と、第２のストレート貫通変流器１０₂からの短絡電流と第４のストレート貫通変流器１０₄からの短絡電流との差電流（以下、「第２の短絡電流Ｉ_Ry2」と称する。）に基づいて送配電線における短絡事故を検出すると、第１乃至第３の遮断器２₁〜２₃と第４乃至第６の遮断器２₄〜２₆とをそれぞれ一括遮断する第３および第４のパルス符号変調電流差動継電器６０₃，６０₄（以下、「第３および第４のＰＣＭ電流差動継電器６０₃，６０₄」と称する。）とを具備する。
なお、第１のＰＣＭ電流差動継電器６０₁と第２のＰＣＭ電流差動継電器６０₂とは、通信網を介して短絡電流を送受信し、第３のパルス符号変調電流差動継電器６０₃と第４のパルス符号変調電流差動継電器６０₄とは、通信網を介して短絡電流を送受信する。 Next, a protective relay device according to a tenth embodiment of the present invention will be described with reference to FIG.
Protective relay apparatus according to this embodiment, as shown in FIG. 15, a first straight through current transformer 10 ₁ installed on the electric transmission of power terminal bus side, the electric transmission of power terminal bus side The second straight through current transformer 10 ₂ installed, the third straight through current transformer 10 ₃ installed in the power transmission / distribution line on the power receiving end bus side, and the power transmission / distribution line on the power receiving end bus side. The difference between the short-circuit current from the fourth straight through current transformer 10 ₄ , the first straight through current transformer 10 ₁ and the short current from the third straight through current transformer 10 ₃ (hereinafter, “ When a short-circuit accident in the transmission / distribution line is detected based on the first short-circuit current I _Ry1 ”), the first to the first phase installed in the R-phase, S-phase, and T-phase of the transmission / distribution line on the power supply end bus side The third circuit breakers 2 ₁ to 2 ₃ and the R-phase, S-phase, and T-phase of the power transmission and distribution line on the receiving end bus side The first and second pulse code modulation current differential relays 60 ₁ and 60 ₂ (hereinafter referred to as “first and second pulse relays”) that collectively block the installed _fourth to _sixth circuit breakers 2 ₄ to 2 ₆ respectively. 2 PCM current differential relays 60 ₁ , 60 ₂ ”) and the short-circuit current from the _second straight through current transformer 10 ₂ and the short-circuit current from the fourth straight through current transformer 10 ₄ . When a short-circuit accident in the transmission / distribution line is detected based on the difference current (hereinafter referred to as “second short-circuit current I _Ry2 ”), the _first to _third circuit breakers 2 ₁ to 2 ₃ and the fourth to sixth third and fourth for the circuit breaker 2 _4-2 ₆ and bulk blocking each pulse code modulation current differential relay 60 _3, 60 ₄ (hereinafter, "the third and fourth PCM current differential relay 60 _3, 60 ₄ ”).
The first PCM current differential relay 60 ₁ and the second PCM current differential relay 60 ₂ transmit and receive a short-circuit current via a communication network, and the third pulse code modulation current differential relay 60 ₃ the fourth pulse code modulation current differential relay 60 _4, to transmit and receive the short-circuit current via the communication network.

ここで、第１および第３のストレート貫通変流器１０₁，１０₃は、２次コイルを巻装した環状鉄心に送配電線のＲ相およびＳ相を同じ向きにストレートに貫通させた貫通形変流器であり、第２および第４のストレート貫通変流器１０₂，１０₄は、２次コイルを巻装した環状鉄心に送配電線のＳ相およびＴ相を同じ向きにストレートに貫通させた貫通形変流器である。
すなわち、送配電線のＲ相およびＳ相はともに第１および第３のストレート貫通変流器１０₁，１０₃の極性方向に貫通されており、送配電線のＳ相およびＴ相はともに第２および第４のストレート貫通変流器１０₂，１０₄の極性方向に貫通されている。
また、第３のストレート貫通変流器１０₃は、第３のストレート貫通変流器１０₃から第２のＰＣＭ電流差動継電器６０₂に入力される短絡電流の極性が第１のストレート貫通変流器１０₁から第１のＰＣＭ電流差動継電器６０₁に入力される短絡電流の極性と逆となるように、第２のＰＣＭ電流差動継電器６０₂に接続されている。同様に、第４のストレート貫通変流器１０₄は、第４のストレート貫通変流器１０₄から第４のＰＣＭ電流差動継電器６０₄に入力される短絡電流の極性が第２のストレート貫通変流器１０₂から第３のＰＣＭ電流差動継電器６０₃に入力される短絡電流の極性と逆となるように、第４のＰＣＭ電流差動継電器６０₄に接続されている。 Here, the first and third straight through current transformers 10 ₁ , 10 ₃ penetrate through an annular core around which a secondary coil is wound so that the R phase and S phase of the power transmission / distribution line are straight through in the same direction. The second and fourth straight through current transformers 10 ₂ and 10 ₄ are straight cores in the same direction with the S and T phases of the power transmission and distribution line on the annular core wound with the secondary coil. This is a through-type current transformer.
That is, both the R phase and S phase of the transmission and distribution line are penetrated in the polar direction of the first and third straight through current transformers 10 ₁ and 10 ₃ , and both the S phase and T phase of the transmission and distribution line are The second and fourth straight through current transformers 10 ₂ and 10 ₄ are penetrated in the polarity direction.
Further, the third straight through current transformer 10 ₃ has a polarity of the short-circuit current input from the _third straight through current transformer 10 ₃ to the second PCM current differential relay 60 ₂ in the first straight through current transformer. from Nagareki 10 ₁ so as to be opposite to the polarity of the first PCM current short-circuit current which is input to the differential relay 60 ₁ is connected to a second PCM current differential relay 60 _2. Similarly, in the fourth straight through current transformer 10 ₄ , the polarity of the short-circuit current input from the fourth straight through current transformer 10 ₄ to the fourth PCM current differential relay 60 ₄ is the second straight through current. as a polarity opposite to the short-circuit current from the current transformer 10 ₂ is inputted to the third PCM current differential relay 60 _3, and is connected to the fourth PCM current differential relay 60 _4.

したがって、送配電線において短絡事故が発生していないときに送配電線の送電端のＲ相、Ｓ相およびＴ相に流れる送電端負荷電流をＩ_aR，Ｉ_aS，Ｉ_aTで表し、送配電線の受電端のＲ相、Ｓ相およびＴ相に流れる受電端負荷電流をＩ_bR，Ｉ_bS，Ｉ_bTで表すと、Ｒ相の送電端負荷電流Ｉ_aRとＳ相の送電端負荷電流Ｉ_aSとは１２０°の位相差で第１のストレート貫通変流器１０₁の環状鉄心を極性方向に貫通して流れ、Ｒ相の受電端負荷電流Ｉ_bRとＳ相の受電端負荷電流Ｉ_bSとは１２０°の位相差で第３のストレート貫通変流器１０₃の環状鉄心を極性方向に貫通して流れる（図１０参照）。
そのため、第１のストレート貫通変流器１０₁から第１のＰＣＭ電流差動継電器６０₁に入力される第１の送電端負荷電流Ｉ_a1はＲ相の送電端負荷電流Ｉ_aRとＳ相の送電端負荷電流Ｉ_aSのベクトル和となり、第１の送電端負荷電流Ｉ_a1の振幅はＲ相の送電端負荷電流Ｉ_aR（Ｓ相の送電端負荷電流Ｉ_aS）の振幅となる。同様に、第３のストレート貫通変流器１０₃から第２のＰＣＭ電流差動継電器６０₂に入力される第１の受電端負荷電流Ｉ_b1はＲ相の受電端負荷電流Ｉ_bRとＳ相の受電端負荷電流Ｉ_bSとのベクトル和（極性は負）となり、第１の受電端負荷電流Ｉ_b1の振幅はＲ相の受電端負荷電流Ｉ_bR（Ｓ相の受電端負荷電流Ｉ_bS）の振幅となる。
Ｉ_a1＝Ｉ_aR−Ｉ_aS
｜Ｉ_a1｜＝｜Ｉ_aR−Ｉ_aS｜＝３^1/2×｜Ｉ_aR｜＝３^1/2×｜Ｉ_aS｜
Ｉ_b1＝−（Ｉ_bR−Ｉ_bS）
｜Ｉ_b1｜＝｜Ｉ_bR−Ｉ_bS｜＝３^1/2×｜Ｉ_bR｜＝３^1/2×｜Ｉ_bS｜
その結果、第１および第２のＰＣＭ電流差動継電器６０₁，６０₂に入力される第１の負荷電流Ｉ₁は、第１の送電端負荷電流Ｉ_a1と第１の受電端負荷電流Ｉ_b1とのベクトル和で表され、第１の負荷電流Ｉ₁の振幅は“０”（｜Ｉ₁｜＝｜Ｉ_a1＋Ｉ_b1｜＝０）となる。
同様に、Ｓ相の送電端負荷電流Ｉ_aSとＴ相の送電端負荷電流Ｉ_aTとは１２０°の位相差で第２のストレート貫通変流器１０₂の環状鉄心を極性方向に貫通して流れ、Ｓ相の受電端負荷電流Ｉ_bSとＴ相の受電端負荷電流Ｉ_bTとは１２０°の位相差で第４のストレート貫通変流器１０₄の環状鉄心を極性方向に貫通して流れる（図１０参照）。
そのため、第２のストレート貫通変流器１０₂から第３のＰＣＭ電流差動継電器６０₃に入力される第２の送電端負荷電流Ｉ_a2はＳ相の送電端負荷電流Ｉ_aSとＴ相の送電端負荷電流Ｉ_aTのベクトル和となり、第２の送電端負荷電流Ｉ_a2の振幅はＳ相の送電端負荷電流Ｉ_aS（Ｔ相の送電端負荷電流Ｉ_aT）の振幅となる。同様に、第４のストレート貫通変流器１０₄から第４のＰＣＭ電流差動継電器６０₄に入力される第２の受電端負荷電流Ｉ_b2はＳ相の受電端負荷電流Ｉ_bSとＴ相の受電端負荷電流Ｉ_bTとのベクトル和（極性は負）となり、第２の受電端負荷電流Ｉ_b2の振幅はＳ相の受電端負荷電流Ｉ_bS（Ｔ相の受電端負荷電流Ｉ_bT）の振幅となる。
Ｉ_a2＝Ｉ_aS＋Ｉ_aT
｜Ｉ_a2｜＝｜Ｉ_aS＋Ｉ_aT｜＝｜Ｉ_aS｜＝｜Ｉ_aT｜
Ｉ_b2＝−（Ｉ_bS−Ｉ_bT）
｜Ｉ_b2｜＝｜Ｉ_bS＋Ｉ_bT｜＝｜Ｉ_bS｜＝｜Ｉ_bT｜
その結果、第３および第４のＰＣＭ電流差動継電器６０₃，６０₄に入力される第２の負荷電流Ｉ₂は、第２の送電端負荷電流Ｉ_a2と第２の受電端負荷電流Ｉ_b2とのベクトル和で表され、第２の負荷電流Ｉ₂の振幅は“０”（｜Ｉ₂｜＝｜Ｉ_a2＋Ｉ_b2｜＝０）となる。 Therefore, the transmission end load current flowing in the R phase, S phase and T phase of the transmission end of the transmission / distribution line when no short circuit accident has occurred in the transmission / distribution line is expressed as I _aR , I _aS , I _aT , When the receiving end load currents flowing in the R phase, S phase, and T phase at the receiving end of the _wire are expressed by I _bR , I _bS , I _bT , the R phase transmission end load current I _aR and the S phase transmission end load current I the _aS flows through the first straight through current transformer 10 ₁ toroid in polar direction with a phase difference of 120 °, the receiving end load R-phase current I _bR and S phases of the receiving end load current I _bS Flows through the annular iron core of the third straight through current transformer 10 _{3 in} the polarity direction with a phase difference of 120 ° (see FIG. 10).
Therefore, the first transmission end load current I _a1 input from the first straight through current transformer 10 ₁ to the first PCM current differential relay 60 ₁ is the R-phase transmission end load current I _aR and the S-phase transmission end load current I _aR . It becomes the vector sum of the power transmission end load current I _aS , and the amplitude of the first power transmission end load current I _a1 becomes the amplitude of the R phase power transmission end load current I _aR (S phase power transmission end load current I _aS ). Similarly, the first receiving end load current I _b1 input from the _third straight through current transformer 10 ₃ to the second PCM current differential relay 60 ₂ is the R receiving end load current I _bR and the S phase. vector sum of the receiving end load current I _bS of (having negative polarity), and the first receiving end load current I _b1 amplitudes (the receiving end load current I _bS of S-phase) the receiving end load current I _bR of R-phase Of the amplitude.
I _a1 = I _aR −I _aS
| I _a1 | = | I _aR −I _aS | = 3 ^1/2 × | I _aR | = 3 ^1/2 × | I _aS |
I _b1 = − (I _bR −I _bS )
| I _b1 | = | I _bR −I _bS | = 3 ^1/2 × | I _bR | = 3 ^1/2 × | I _bS |
As a result, the first load current I ₁ input to the first and second PCM current differential relays 60 ₁ , 60 ₂ is the first power transmission end load current I _a1 and the first power reception end load current I. represented by the vector sum of the _b1, first amplitude of the load current I ₁ is "0" becomes _{(| I 1 | = | =} 0 | I a1 + I b1).
Similarly, through the sending end load current I _aS and T phases of the sending end load current I _aT and a second straight through current transformer 10 _{and second} annular core with a phase difference of 120 ° is the S-phase in the polar direction The S-phase receiving end load current I _bS and the T-phase receiving end load current I _bT flow through the annular core of the fourth straight through current transformer 10 _{4 in} the polarity direction with a phase difference of 120 °. (See FIG. 10).
Therefore, from the second straight through current transformer 10 ₂ of the third PCM current differential relay 60 ₃ second input to the sending end load current I _a2 is sending end load S phase current I _aS and T-phase It becomes the vector sum of the power transmission end load current I _aT , and the amplitude of the second power transmission end load current I _{a2 is} the amplitude of the S phase power transmission end load current I _aS (T phase power transmission end load current I _aT ). Similarly, the second receiving end load current I _b2 input from the fourth straight through current transformer 10 ₄ to the fourth PCM current differential relay 60 ₄ is the S receiving end load current I _bS and the T phase. _Of the second receiving end load current I _{b2 and} the amplitude of the second receiving end load current I _b2 is the S phase receiving end load current I _bS (T phase receiving end load current I _bT ). Of the amplitude.
I _a2 = I _aS + I _aT
| I _a2 | = | I _aS + I _aT | = | I _aS | = | I _aT |
I _b2 = − (I _bS −I _bT )
| I _b2 | = | I _bS + I _bT | = | I _bS | = | I _bT |
As a result, the second load current I ₂ input to the third and fourth PCM current differential relays 60 ₃ and 60 ₄ is the second power transmission end load current I _a2 and the second power reception end load current I. represented by the vector sum of the _b2, the second amplitude of the load current I ₂ is "0" becomes _{(| I 2 | = | =} 0 | I a2 + I b2).

また、送電線において短絡事故が発生したときに送配電線のＲ相、Ｓ相およびＴ相に流れる短絡電流をＩ_FR，Ｉ_FS，Ｉ_FTで表すと、第１の短絡電流Ｉ_Ry1（第１のストレート貫通変流器１０₁からの短絡電流と第３のストレート貫通変流器１０₃からの短絡電流との差電流）と第２の短絡電流Ｉ_Ry2（第２のストレート貫通変流器１０₂からの短絡電流と第４のストレート貫通変流器１０₄からの短絡電流との差電流）は、上述した第６の実施例による第１および第２の過電流継電器４₁，４₂の場合と同様にして、事故様相に応じて以下のように表される。
（１）Ｒ相−Ｓ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS＝０
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝０
Ｉ_Ry2＝Ｉ_FS
｜Ｉ_Ry2｜＝｜Ｉ_FS｜
（２）Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT＝０
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝０
（３）Ｔ相−Ｒ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR
｜Ｉ_Ry1｜＝｜Ｉ_FR｜
Ｉ_Ry2＝Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FT｜
（４）Ｒ相−Ｓ相−Ｔ相間の短絡事故の場合
Ｉ_Ry1＝Ｉ_FR＋Ｉ_FS
｜Ｉ_Ry1｜＝｜Ｉ_FR＋Ｉ_FS｜＝｜Ｉ_FR｜＝｜Ｉ_FS｜
Ｉ_Ry2＝Ｉ_FS＋Ｉ_FT
｜Ｉ_Ry2｜＝｜Ｉ_FS＋Ｉ_FT｜＝｜Ｉ_FS｜＝｜Ｉ_FT｜ Further, when the short-circuit current flowing in the R-phase, S-phase, and T-phase of the transmission and distribution line when a short-circuit accident occurs in the transmission line is represented by I _FR , I _FS , I _FT , the first short-circuit current I _Ry1 (first Difference between the short-circuit current from one straight through current transformer 10 ₁ and the short-circuit current from the third straight through current transformer 10 ₃ ) and the second short-circuit current I _Ry2 (second straight through current transformer) The difference between the short-circuit current from 10 ₂ and the short-circuit current from the fourth straight through current transformer 10 ₄ is the first and second overcurrent relays 4 ₁ and 4 ₂ according to the sixth embodiment described above. As in the case of, it is expressed as follows according to the aspect of the accident.
(1) In case of short circuit between R phase and S phase I _Ry1 = I _FR + I _FS = 0
| I _Ry1 | = | I _FR + I _FS | = 0
I _Ry2 = I _FS
| I _Ry2 | = | I _FS |
(2) In the case of a short circuit between S phase and T phase I _Ry1 = I _FS
| I _Ry1 | = | I _FS |
I _Ry2 = I _FS + I _FT = 0
| I _Ry2 | = | I _FS + I _FT | = 0
(3) In case of short circuit between T phase and R phase I _Ry1 = I _FR
｜ I _Ry1 ｜＝｜ I _FR ｜
I _Ry2 = I _FT
| I _Ry2 | = | I _FT |
(4) In case of short circuit between R phase, S phase and T phase I _Ry1 = I _FR + I _FS
| I _Ry1 | = | I _FR + I _FS | = | I _FR | = | I _FS |
I _Ry2 = I _FS + I _FT
| I _Ry2 | = | I _FS + I _FT | = | I _FS | = | I _FT |

第１および第２のＰＣＭ電流差動継電器６０₁，６０₂は、第１の短絡電流Ｉ_Ry1の振幅が電流整定値を超えた場合には、送配電線において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。
また、第３および第４のＰＣＭ電流差動継電器６０₃，６０₄は、第２の短絡電流Ｉ_Ry2の振幅が電流整定値を超えた場合には、送配電線において短絡事故が発生したと判定して、第１乃至第６の遮断器２₁〜２₆を一括遮断する。 The first and second PCM current differential relays 60 ₁ and 60 ₂ determine that a short-circuit accident has occurred in the transmission and distribution line when the amplitude of the first short-circuit current I _Ry1 exceeds the current set value. Thus, the first to _sixth circuit breakers 2 ₁ to 2 ₆ are collectively disconnected.
In addition, the third and fourth PCM current differential relays 60 ₃ and 60 ₄ indicate that when the amplitude of the second short-circuit current I _Ry2 exceeds the current set value, a short-circuit accident has occurred in the transmission and distribution line. Determination is made and the _first to _sixth circuit breakers 2 ₁ to 2 ₆ are collectively cut off.

上述した第６乃至第１０の実施例では、送配電線につきストレート貫通変流器および短絡保護継電器を２組使用することにより、自回路および他回路にまたがる短絡事故であっても確実に検出することができる。 In the above-described sixth to tenth embodiments, by using two sets of straight through current transformers and short circuit protection relays for transmission and distribution lines, it is possible to reliably detect even a short circuit accident that spans the own circuit and other circuits. be able to.

以上では、送配電線において使用される短絡保護継電器との組合せでストレート貫通変流器について説明したが、ストレート貫通変流器は、たとえばロボットの手足を駆動するための三相モータ（三相負荷）に電力を供給する三相交流回路において使用されている短絡保護装置と組み合わせても、同様の効果を得ることができる。
また、ストレート貫通変流器の環状鉄心には三相交流回路の任意の２相を１回だけ貫通させたが、三相交流回路の任意の２相が２回以上貫通するように、三相交流回路の任意の２相をストレート貫通変流器の環状鉄心に同じ回数または異なる回数だけ巻いてもよい。 In the above, a straight through current transformer has been described in combination with a short-circuit protective relay used in a power transmission and distribution line. The same effect can be obtained even when combined with a short-circuit protection device used in a three-phase AC circuit that supplies power to (3).
In addition, although any two phases of the three-phase AC circuit are passed through the annular core of the straight through current transformer only once, the three-phase so that any two phases of the three-phase AC circuit penetrate two or more times. Any two phases of the AC circuit may be wound around the annular core of the straight through current transformer the same number of times or different times.

本発明の第１の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protection relay apparatus by 1st Example of this invention. 短絡事故が発生していないときに図１に示した差接続された第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される負荷電流Ｉについて説明するための図である。To describe the load current I input to the overcurrent relay 4 from the first and second straight through current transformers 10 ₁ and 10 ₂ connected as shown in FIG. 1 when no short circuit accident has occurred. FIG. 短絡事故が発生したときに図１に示した第１および第２のストレート貫通変流器１０₁，１０₂から過電流継電器４に入力される短絡電流Ｉ_Ryについて説明するための図である。It is a diagram for explaining a short-circuit current I _Ry input to the first and second straight through current transformer 10 _1, 10 ₂ from the overcurrent relay 4 shown in FIG. 1 when a short circuit accident occurs. 本発明の第２の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 2nd Example of this invention. 本発明の第３の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protection relay apparatus by the 3rd Example of this invention. 本発明の第４の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 4th Example of this invention. 本発明の第５の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 5th Example of this invention. 図１に示した過電流継電器４などの検出感度および動作時間を同じにするための演算処理部の一構成例を示す図である。It is a figure which shows the example of 1 structure of the arithmetic processing part for making detection sensitivity and operation time, such as the overcurrent relay 4 shown in FIG. 1, the same. 本発明の第６の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 6th Example of this invention. 短絡事故が発生していないときに図９に示した第１および第２のストレート貫通変流器１０₁，１０₂から第１および第２の過電流継電器４₁，４₂にそれぞれ入力される第１および第２の負荷電流Ｉ₁，Ｉ₂について説明するための図である。When no short-circuit accident has occurred, the first and second straight through current transformers 10 ₁ and 10 ₂ shown in FIG. 9 are input to the first and second overcurrent relays 4 ₁ and 4 ₂ , respectively. load current I ₁ of the first and second, is a diagram for explaining I _2. 短絡事故が発生したときに図９に示した第１および第２のストレート貫通変流器１０₁，１０₂から第１および第２の過電流継電器４₁，４₂にそれぞれ入力される第１および第２の短絡電流Ｉ_Ry1，Ｉ_Ry2について説明するための図である。The first and second straight through current transformers 10 ₁ and 10 ₂ shown in FIG. 9 and the first and second overcurrent relays 4 ₁ and 4 ₂ are respectively input to the first and second overcurrent relays 4 ₁ and 4 ₂ when a short circuit accident occurs. and second short-circuit current I _Ry1, is a diagram for explaining I _Ry2. 本発明の第７の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 7th Example of this invention. 本発明の第８の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 8th Example of this invention. 本発明の第９の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 9th Example of this invention. 本発明の第１０の実施例による保護継電装置について説明するための図である。It is a figure for demonstrating the protective relay apparatus by the 10th Example of this invention. 末端回路の送配電線などで過電流継電器を２相にだけ設置して短絡事故からの保護を図る従来方法を説明するための図である。It is a figure for demonstrating the conventional method which protects from a short circuit accident by installing an overcurrent relay only in two phases by the transmission / distribution line etc. of a terminal circuit.

Explanation of symbols

１電源
２₁〜２₉ 第１乃至第９の遮断器
３₁，３₂ 第１および第２の変流器
４，３０過電流継電器
４₁，４₂，３０₁，３０₂ 第１および第２の過電流継電器
５変圧器
１０₁〜１０₆ 第１乃至第６のストレート貫通変流器
２０電流差動継電器
２０₁，２０₂ 第１および第２の電流差動継電器
４０₁〜４０₄ 第１乃至第４の過電流継電器
６０₁〜６０₄ 第１乃至第４のＰＣＭ電流差動継電器
７１事故様相判定回路
７２₁〜７２₃ 第１乃至第３の振幅調整回路
７３選択スイッチ
１Ｌ，２Ｌ第１および第２の送配電線
Ｉ，Ｉ_R，Ｉ_S，Ｉ_T 負荷電流
Ｉ₁，Ｉ₂ 第１および第２の負荷電流
ｉ₁，Ｉ_1R，Ｉ_1S，Ｉ_1T １次負荷電流
ｉ₂，Ｉ_2R，Ｉ_2S，Ｉ_2T ２次負荷電流
ｉ₁₁，ｉ₁₂ 第１および第２の１次負荷電流
ｉ₂₁，ｉ₂₂ 第１および第２の２次負荷電流
Ｉ_a，Ｉ_aR，Ｉ_aS，Ｉ_aT 送電端負荷電流
Ｉ_b，Ｉ_bR，Ｉ_bS，Ｉ_bT 受電端負荷電流
Ｉ_a1，Ｉ_a2 第１および第２の送電端負荷電流
Ｉ_b1，Ｉ_b2 第１および第２の受電端負荷電流
Ｉ_Ry，Ｉ_FR，Ｉ_FS，Ｉ_FT，ｉ_F1，ｉ_F2 短絡電流
Ｉ_Ry1，Ｉ_Ry2 第１および第２の短絡電流
Ｓ_SW スイッチ制御信号
θ インピーダンス角 1 power supply 2 _{1 to} 2 ₉ _first to _ninth circuit breakers 3 ₁ and 3 ₂ first and second current transformers 4 and 30 overcurrent relays 4 ₁ , 4 ₂ , 30 ₁ and 30 ₂ first and second 2 overcurrent relays 5 transformers 10 ₁ to 10 ₆ _first to _sixth straight through current transformers 20 current differential relays 20 ₁ and 20 ₂ first and second current differential relays 40 ₁ to 40 ₄ 1st to 4th overcurrent relays 60 _{1 to} 60 ₄ 1st to 4th PCM current differential relays 71 Accident aspect judgment circuits 72 _{1 to} 72 ₃ 1st to 3rd amplitude adjustment circuits 73 selection switches 1L and 2L First and second transmission and distribution lines I, I _R , I _S , I _T load currents I ₁ , I ₂ first and second load currents i ₁ , I _1R , I _1S , I _1T primary load current i ₂ , I _2R , I _2S , I _2T secondary load currents i ₁₁ , i ₁₂ first and second primary load currents i ₂₁ , i ₂₂ first and second secondary loads Currents I _a , I _aR , I _aS , I _aT transmitting end load currents I _b , I _bR , I _bS , I _bT receiving end load currents I _a1 , I _a2 first and second transmitting end load currents I _b1 , I _b2 first and second receiving end load current _{_{_{I Ry, I FR, I FS}}} , I FT, i F1, i F2 short-circuit current I _Ry1, I _Ry2 first and second short-circuit current S _SW switch control signal θ impedance Corner

Claims

A protective relay device for protecting a three-phase AC circuit from a short circuit accident,
A straight through current transformer in which a first phase and a second phase of the three-phase alternating current circuit are straightly penetrated in the same direction in an annular core wound with a secondary coil;
Others in which the second and third phases of the three-phase AC circuit are straightly penetrated in the same direction through a ring-shaped iron core wound with a secondary coil, and are differentially connected to the straight through current transformer Straight through current transformers,
When a short-circuit fault is detected based on a short-circuit current input from the straight-through current transformer and the other straight-through current transformer connected to the differential connection, the circuit breakers installed in each phase of the three-phase AC circuit are collectively shut off. With a short-circuit protection relay,
A protective relay device comprising:

The straight through current transformer is a first straight through current transformer (10 ₁ ) installed on a transmission and distribution line;
The other straight through current transformer is a second straight through current transformer (10 ₂ ) installed in the transmission and distribution line,
The first and second straight through current transformers are differentially connected;
When the short-circuit protective relay detects a short-circuit fault based on the short-circuit current (I _Ry ) input from the first and second straight through current transformers connected to the difference, it is installed in each phase of the transmission and distribution line An overcurrent relay (4) that collectively shuts off the _first to _third circuit breakers (2 ₁ to 2 ₃ ),
The protective relay device according to claim 1, wherein:

The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the primary side and the secondary side of the transformer (5), respectively.
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the primary side and the secondary side of the transformer;
The first and second straight through current transformers are differentially connected;
The third and fourth straight through current transformers are differentially connected;
The short-circuit protection relay is short-circuited from the short-circuit current input from the first and second straight through current transformers connected to the difference and shorted from the second and fourth straight through current transformers connected to the difference. When a short circuit fault is detected based on the difference current from the current, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in the respective primary phases of the transformer and the secondary of the transformer Current differential relay (20) that collectively cuts off the _fourth to _sixth circuit breakers (2 ₄ to 2 ₆ ) installed in each phase on the side,
The protective relay device according to claim 1, wherein:

The first and third straight through current transformers (10 ₁ , 10 ₃ ) are installed in the first and second transmission / distribution lines (1L, 2L) branched from the bus bar, respectively. And
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) installed in the first and second transmission and distribution lines, respectively.
The first and second straight through current transformers are differentially connected;
The third and fourth straight through current transformers are differentially connected;
The short-circuit protection relay is short-circuited from the short-circuit current input from the first and second straight through current transformers connected to the difference and short-circuited from the third and fourth straight through current transformers connected to the difference. When a short-circuit fault is detected based on the sum current with the current, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the first transmission and distribution line and the second transmission and distribution An overcurrent relay (30) that collectively disconnects the _fourth to _sixth circuit breakers (2 ₄ to 2 ₆ ) installed in each phase of the electric wire;
The protective relay device according to claim 1, wherein:

The straight through current transformer is branched from the first straight through current transformer (10 ₁ ) installed in the first transmission / distribution line (1L) branched from the first bus and the second bus. And a third straight through current transformer (10 ₃ ) installed in the second power transmission and distribution line (2L) and a fifth straight through current transformer installed in the first bus bar or the second bus bar. With a vessel (10 ₅ )
The other straight through current transformer includes a second straight through current transformer (10 ₂ ) installed in the first power transmission / distribution line and a fourth straight installed in the second power transmission / distribution cable. A through current transformer (10 ₄ ) and a sixth straight through current transformer (10 ₆ ) installed in the first bus bar or the second bus bar,
The first and second straight through current transformers are differentially connected;
The third and fourth straight through current transformers are differentially connected;
The fifth and sixth straight through current transformers are differentially connected;
The short-circuit protection relay is short-circuited from the short-circuit current input from the first and second straight through current transformers connected to the difference and short-circuited from the fifth and sixth straight through current transformers connected to the difference. When a short circuit accident is detected based on a difference current from the current, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the first transmission and distribution line and the first and second A first overcurrent relay (40 ₁ ) that collectively shuts off the _seventh to _ninth circuit breakers (2 ₇ to 2 ₉ ) installed between the phases of the bus of the first and second buses, and the third and second differentially connected terminals When a short-circuit fault is detected based on the difference current between the short-circuit current input from the straight through current transformer of 4 and the short-circuit current input from the fifth and sixth straight through current transformers connected to the difference, fourth to sixth breaker installed in each phase of the second transmission and distribution lines (2 ₄ The two ₆₎ to seventh is a second over-current relay (40 ₂₎ for collectively blocking the ninth breaker,
The protective relay device according to claim 1, wherein:

The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution lines, respectively.
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution lines, respectively. Yes,
The first and second straight through current transformers are differentially connected;
The third and fourth straight through current transformers are differentially connected;
The short circuit protection relay is configured such that a difference between a short circuit current from the first and second straight through current transformers connected to the difference and a short circuit current from the third and fourth straight through current transformers connected to the difference is connected. When a short circuit accident is detected based on the current, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the power transmission and distribution line on the power supply end bus side and the power reception end bus side on the side First and second pulse code modulation current differential relays (60 ₁ , 60 ₂ ) that collectively cut off the _fourth to _sixth circuit breakers (2 ₄ to 2 ₆ ) installed in each phase of the transmission and distribution lines. )
The protective relay device according to claim 1, wherein:

A straight through current transformer connected to the difference according to a determination result of the accident aspect, determining an accident aspect based on a line voltage, a phase voltage, or a phase / line voltage of the transmission / distribution electric wire or the bus, and 7. The computer according to claim 1, further comprising arithmetic processing means for making a short-circuit current input from another straight through current transformer 1 time, ^1/2 time, or 1/3 ^1/2 times. The protective relay device according to any one of the above.

A protective relay device for protecting a three-phase AC circuit from a short circuit accident,
A straight through current transformer in which a first phase and a second phase of the three-phase alternating current circuit are straightly penetrated in the same direction in an annular core wound with a secondary coil;
Another straight through current transformer in which the second phase and the third phase of the three-phase alternating current circuit are straightly penetrated in the same direction in an annular core around which a secondary coil is wound;
A first short-circuit protection relay that collectively shuts off a circuit breaker installed in each phase of the three-phase AC circuit when a short-circuit accident is detected based on a short-circuit current input from the straight through current transformer;
A second short-circuit protection relay that collectively shuts off the circuit breaker when a short-circuit fault is detected based on a short-circuit current input from the other straight through current transformer;
A protective relay device comprising:

In the case of a short-circuit accident between the first phase and the second phase of the three-phase AC circuit, only the second short-circuit protection relay operates to collectively shut off the circuit breaker,
In the case of a short-circuit accident between the second phase and the third phase of the three-phase AC circuit, only the first short-circuit protection relay operates to collectively shut off the circuit breakers.
The protective relay device according to claim 8, wherein:

The straight through current transformer is a first straight through current transformer (10 ₁ ) installed on a transmission and distribution line;
The other straight through current transformer is a second straight through current transformer (10 ₂ ) installed in the transmission and distribution line,
When the first short-circuit protection relay detects a short-circuit accident based on the first short-circuit current (I _Ry1 ) input from the first straight through current transformer, it is installed in each phase of the transmission and distribution line. A first overcurrent relay (4 ₁ ) that collectively cuts off the _first to _third circuit breakers (2 ₁ to 2 ₃ ),
When the second short-circuit protection relay detects a short-circuit fault based on the second short-circuit current (I _Ry2 ) input from the second straight through current transformer, the first to third circuit breakers are turned on. The second overcurrent relay (4 ₂ ) that cuts off at once.
The protective relay device according to claim 8 or 9, characterized in that.

The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the primary side and the secondary side of the transformer (5), respectively.
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) respectively installed on the primary side and the secondary side of the transformer;
The first short circuit protection relay performs a short circuit accident based on a difference current between a short circuit current input from the first straight through current transformer and a short circuit current input from the third straight through current transformer. When detected, the _first to _third circuit breakers (2 ₁ to 2 ₃ ) installed in the respective phases on the primary side of the transformer and the fourth to fourth circuits installed on the respective phases on the secondary side of the transformer. A first current differential relay (20 ₁ ) that collectively shuts off the sixth circuit breaker (2 ₄ to 2 ₆ );
The second short circuit protection relay performs a short circuit accident based on a difference current between a short circuit current input from the second straight through current transformer and a short circuit current input from the fourth straight through current transformer. A second current differential relay (20 ₂ ) that collectively shuts off the first to third circuit breakers and the fourth to sixth circuit breakers upon detection;
The protective relay device according to claim 8 or 9, characterized in that.

The first and third straight through current transformers (10 ₁ , 10 ₃ ) are installed in the first and second transmission / distribution lines (1L, 2L) branched from the bus bar, respectively. And
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) installed in the first and second transmission and distribution lines, respectively.
The first short circuit protection relay performs a short circuit accident based on a sum current of a short circuit current input from the first straight through current transformer and a short circuit current input from the third straight through current transformer. When detected, the first to third circuit breakers (2 ₁ to 2 ₃ ) installed in the respective phases of the first transmission and distribution line and the fourth to fourth elements installed in the respective phases of the second transmission and distribution line. A first overcurrent relay (30 ₁ ) that collectively shuts off the sixth circuit breaker (2 ₄ to 2 ₆ );
The second short circuit protection relay performs a short circuit accident based on a sum current of a short circuit current input from the second straight through current transformer and a short circuit current input from the fourth straight through current transformer. A second overcurrent relay (30 ₂ ) that collectively shuts off the first to third circuit breakers and the fourth to sixth circuit breakers upon detection;
The protective relay device according to claim 8 or 9, characterized in that.

The straight through current transformer is branched from the first straight through current transformer (10 ₁ ) installed in the first transmission / distribution line (1L) branched from the first bus and the second bus. And a third straight through current transformer (10 ₃ ) installed in the second power transmission and distribution line (2L) and a fifth straight through current transformer installed in the first bus bar or the second bus bar. With a vessel (10 ₅ )
The other straight through current transformer includes a second straight through current transformer (10 ₂ ) installed in the first power transmission / distribution line and a fourth straight installed in the second power transmission / distribution cable. A through current transformer (10 ₄ ) and a sixth straight through current transformer (10 ₆ ) installed in the first bus bar or the second bus bar,
The first short circuit protection relay performs a short circuit accident based on a difference current between a short circuit current input from the first straight through current transformer and a short circuit current input from the fifth straight through current transformer. Upon detection, the first to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the first transmission / distribution line and the seventh installed between each phase of the first and second bus bars. Thru | or the 9th circuit breaker (2 ₇ to 2 ₉ ), the first overcurrent relay (40 ₁ ) that collectively cuts off, the short-circuit current input from the third straight through current transformer, and the fifth When a short-circuit fault is detected based on the difference current from the short-circuit current input from the straight through current transformer, the fourth to sixth circuit breakers (2 ₄ to 6 installed in each phase of the second transmission / distribution line). de 2 ₆₎ and the seventh to second overcurrent relay for collectively blocking the ninth breaker (40 ₂₎ Ri,
The second short circuit protection relay performs a short circuit accident based on a difference current between a short circuit current input from the second straight through current transformer and a short circuit current input from the sixth straight through current transformer. When detected, a third overcurrent relay (40 ₃ ) that collectively cuts off the first to third circuit breakers and the seventh to ninth circuit breakers and an input from the fourth straight through current transformer When a short-circuit fault is detected based on a difference current between the short-circuit current to be input and the short-circuit current input from the sixth straight through current transformer, the fourth to sixth circuit breakers and the seventh to ninth And a fourth overcurrent relay (40 ₄ ) that collectively breaks the breaker.
The protective relay device according to claim 8 or 9, characterized in that.

The straight through current transformers are first and third straight through current transformers (10 ₁ , 10 ₃ ) installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution lines, respectively.
The other straight through current transformers are second and fourth straight through current transformers (10 ₂ , 10 ₄ ) installed on the power supply end bus side and the power receiving end bus side of the transmission and distribution lines, respectively. Yes,
When the first short circuit protection relay detects a short circuit accident based on a difference current between a short circuit current from the first straight through current transformer and a short circuit current from the third straight through current transformer, First to third circuit breakers (2 ₁ to 2 ₃ ) installed in each phase of the transmission / distribution line on the power supply end bus side and first phases installed in each phase of the transmission / distribution line on the power receiving end bus side 1st and 2nd pulse code modulation current differential relays (60 ₁ , 60 ₂ ) that collectively cut off ₄ to ₆ circuit breakers (2 ₄ to 2 ₆ ) respectively;
When the second short circuit protection relay detects a short circuit accident based on a difference current between a short circuit current from the second straight through current transformer and a short circuit current from the fourth straight through current transformer, Third and fourth pulse code modulation current differential relays (60 ₃ , 60 ₄ ) that collectively cut off the first to third circuit breakers and the fourth to sixth circuit breakers, respectively.
The protective relay device according to claim 8 or 9, characterized in that.