JPH07106019B2 - House disconnection detector - Google Patents
House disconnection detectorInfo
- Publication number
- JPH07106019B2 JPH07106019B2 JP62047022A JP4702287A JPH07106019B2 JP H07106019 B2 JPH07106019 B2 JP H07106019B2 JP 62047022 A JP62047022 A JP 62047022A JP 4702287 A JP4702287 A JP 4702287A JP H07106019 B2 JPH07106019 B2 JP H07106019B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- fuse
- zero
- detection element
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電力系統の電圧変成器の２次側に設置された
ヒューズの切断を検出するヒューズ断検出装置に関する
ものである。Description: TECHNICAL FIELD The present invention relates to a fuse blowout detecting device for detecting blowout of a fuse installed on a secondary side of a voltage transformer of a power system.
第２図は従来のヒューズ断検出装置を適用した母線系統
の保護継電装置を示すブロック図であり、第２図におい
て、（Ａ），（Ｂ），（Ｃ）は被保護の３相系統送電
線、（CTA），（CTB），（CTC）は送電線（Ａ），
（Ｂ），（Ｃ）の各相に設けられた変流器、（FA），
（FB），（FC）は被検出ヒューズで、１次側を送電線
（Ａ），（Ｂ），（Ｃ）の各相に接続した電圧変成器
（PTA），（PTB），（PTC）の２次側に接続されてい
る。（CB）は送電線（Ａ），（Ｂ），（Ｃ）に設けたし
ゃ断器である。FIG. 2 is a block diagram showing a protection relay device of a bus system to which a conventional fuse blowout detection device is applied. In FIG. 2, (A), (B), and (C) are three-phase systems to be protected. Transmission line, (CT A ), (CT B ), (CT C ) is transmission line (A),
(B), (C) current transformer provided in each phase, (F A ),
(F B ), (F C ) are detected fuses, and voltage transformers (PT A ), (PT B ) whose primary side is connected to each phase of the transmission lines (A), (B), (C) , (PT C ) connected to the secondary side. (CB) is a circuit breaker provided on the power transmission lines (A), (B), and (C).
（１）はヒューズ断検出装置で、３相電圧Va,Vb,Vcを入
力して零相電圧V0を導出するための合成トランス
（TA），（TB），（TC）と、零相電圧V0が所定値（後え
ば、定格電圧の10％）以上か否かを検出する零相電圧検
出要素（OVG）と、零相電流I0が所定値（例えば定格電
流の10％）以上か否かを検出する零相電流検出要素（OC
G）と、零相電圧検出要素（OVG）の出力を肯定入力と
し、零相電流検出要素（OCG）の出力を禁止入力とする
論理回路としてのインヒビット（INHIBIT）回路（IN−
１）とから構成されている。(1) is a fuse blowout detection device, and a combined transformer (T A ), (T B ), (T C ) for inputting three-phase voltages Va, Vb, Vc and deriving a zero-phase voltage V 0 , A zero-phase voltage detection element (OVG) that detects whether or not the zero-phase voltage V 0 is a predetermined value (10% of the rated voltage later) and a zero-phase current I 0 are a predetermined value (for example, 10% of the rated current). ) Zero-phase current detection element (OC
G) and the output of the zero-phase voltage detection element (OVG) as a positive input and the output of the zero-phase current detection element (OCG) as a prohibited input, and an inhibit circuit (INHIBIT) circuit (IN-
1) and.
（DZ）は送電線（Ａ），（Ｂ），（Ｃ）の保護用距離継
電器で該送電線に故障が発生すると、しゃ断器（CB）に
トリップ指令を出力する。また、送電線（Ａ），
（Ｂ），（Ｃ）に負荷電流が流れている状態で、電圧変
成器（PTA），（PTB），（PTC）の２次側ヒューズ
（FA），（FB），（FC）の内少なくとも１個が溶断する
と、送電線に故障が発生したと見なして、距離継電器
（DZ）が不要応動し、しゃ断器（CB）にトリップ指令を
出力することになる。(DZ) is a protective distance relay for the transmission lines (A), (B) and (C), and outputs a trip command to the circuit breaker (CB) when a failure occurs in the transmission line. In addition, the transmission line (A),
With the load current flowing in ( B ) and ( C ), the secondary side fuses (F A ), (F B ), (of the voltage transformers (PT A ), (PT B ), (PT C ) If at least one of F C ) is blown, it is considered that a failure has occurred in the transmission line, the distance relay (DZ) responds unnecessarily, and a trip command is output to the circuit breaker (CB).
そこで、上記のような距離継電器（DZ）の不要応動を防
ぐため、前記ヒューズ断検出装置（１）が動作したら、
外部へアラームを出すと共に距離継電器DZを自動的にロ
ックするように接続されている。Therefore, in order to prevent unnecessary reaction of the distance relay (DZ) as described above, when the fuse blowout detection device (1) operates,
It is connected so that an alarm is output to the outside and the distance relay DZ is automatically locked.
次に上記ヒューズ断検出装置の動作について説明する。
被検出ヒューズ（FA），（FB），（FC）が全て正常であ
る時は、ヒューズの出力側３相電圧Va,Vb,Vcは健全定格
電圧でバランスしており、零相電圧V0は零である。Next, the operation of the fuse blowout detecting device will be described.
When the detected fuses (F A ), (F B ), and (F C ) are all normal, the three-phase voltages Va, Vb, and Vc on the output side of the fuse are balanced at a sound rated voltage, and the zero-phase voltage V 0 is zero.
ところが、例えば電圧変成器（PTA），（PTB），（P
TC）の２次側で、Ａ相,B相の短絡故障が発生すると、ヒ
ューズ（FA），（FB）は溶断し、このため、零相電圧V0
が発生し、零相電圧検出要素（OVG）が動作する。However, for example, voltage transformers (PT A ), (PT B ), (P
When a short circuit fault of A phase and B phase occurs on the secondary side of T C ), the fuses (F A ) and (F B ) are blown, and therefore the zero phase voltage V 0
Occurs and the zero-phase voltage detection element (OVG) operates.
一方、系統送電線（Ａ），（Ｂ），（Ｃ）には、地絡故
障は発生していないので、零相電流I0は零で、零相電流
検出要素（OCG）は不動作である。従ってインヒビット
回路（IN−１）がヒューズ断検出の出力を出す。On the other hand, since no ground fault has occurred in the system transmission lines (A), (B), and (C), the zero-phase current I 0 is zero and the zero-phase current detection element (OCG) does not operate. is there. Therefore, the inhibit circuit (IN-1) outputs the fuse blown detection output.
また、ヒューズ断ではなくて、系統送電線（Ａ），
（Ｂ），（Ｃ）に１相地絡故障が発生した場合にも、零
相電圧検出要素（OVG）は動作するが、この時は零相電
流I0が発生し、零相電流検出要素（OCG）も動作するの
で、インヒビット回路（IN−１）からヒューズ断検出の
出力が生ずることはない。In addition, the fuse is not blown, but the system transmission line (A),
The zero-phase voltage detection element (OVG) operates even when a one-phase ground fault occurs in (B) and (C), but at this time, the zero-phase current I 0 is generated and the zero-phase current detection element is generated. Since (OCG) also operates, the fuse blowout detection output does not occur from the inhibit circuit (IN-1).
従来のヒューズ断検出装置は、上記のように構成されて
いるので、ヒューズ（FA），（FB），（FC）の内、１相
又は２相のヒューズが断となった場合は、零相電圧V0が
発生してヒューズ断を検出するが、３相全てのヒューズ
が断となった場合は、零相電圧V0が発生しないので、検
出できないという問題点があった。Since the conventional fuse blowout detection device is configured as described above, in the case where one or two phase fuses among the fuses (F A ), (F B ), and (F C ) are blown, However, there is a problem in that the zero-phase voltage V 0 is generated and the blown fuse is detected, but when all the fuses in all three phases are blown, the zero-phase voltage V 0 is not generated and thus cannot be detected.
この発明は、上記のような問題点を解消するためになさ
れたもので、１相,2相のヒューズ断はもちろん３相全て
のヒューズが断となった場合も確実にヒューズ断を検出
できる高感度のヒューズ断検出装置を得ることを目的と
する。The present invention has been made in order to solve the above problems, and it is possible to reliably detect blown fuses not only when the fuses of one and two phases are blown but also when all the fuses of all three phases are blown. The object is to obtain a fuse blowout detection device with high sensitivity.
〔問題点を解決するための手段〕 この発明によるヒューズ断検出装置は、零相電圧検出要
素、零相電流検出要素に加えて、３相の被検出ヒューズ
のいずれか１相、例えばＡ相ヒューズの両端に接続され
たヒューズ電圧検出要素を備え、零相電圧検出要素の出
力があって、零相電流検出要素の出力がない場合、又は
ヒューズ電圧検出要素の出力がある場合に、被検出ヒュ
ーズの断を検出する論理回路を備えたものである。[Means for Solving the Problems] In the fuse blowout detecting device according to the present invention, in addition to the zero-phase voltage detecting element and the zero-phase current detecting element, one of the three-phase detected fuses, for example, an A-phase fuse is used. The fuse to be detected is provided with a fuse voltage detection element connected to both ends of the fuse and there is an output of the zero-phase voltage detection element and no output of the zero-phase current detection element, or there is an output of the fuse voltage detection element. It is equipped with a logic circuit for detecting disconnection.
この発明におけるヒューズ断検出装置は、１相又は２相
のヒューズが断となった場合は、零相電流検出要素が不
動作で零相電圧検出要素が動作で検出し、３相全てのヒ
ューズが断となった場合は、ヒューズ電圧検出要素（O
V）が動作することにより検出する。In the fuse blowout detecting device according to the present invention, when the one-phase fuse or the two-phase fuse is blown, the zero-phase current detecting element does not operate and the zero-phase voltage detecting element detects the operation, and all the three-phase fuses are detected. If it is blown, the fuse voltage detection element (O
It is detected when V) operates.
以下、この発明の一実施例を第１図について説明する。 An embodiment of the present invention will be described below with reference to FIG.
第１図において、（TOV）はＡ相のヒューズの両端電圧V
afを導入する入力トランス、（OV）はヒューズの両端電
圧Vafが所定値（例えば、定格電圧の10％）以上か否か
を検出するヒューズ電圧検出要素、（OR）は論理和回路
である。In Fig. 1, ( TOV ) is the voltage V across the A-phase fuse.
An input transformer that introduces af, (OV) is a fuse voltage detection element that detects whether the voltage Vaf across the fuse is a predetermined value (for example, 10% of the rated voltage) or more, and (OR) is an OR circuit.
次に動作を説明する。Next, the operation will be described.
（イ）.1相又は２相のヒューズが断となった場合 従来の装置と同様に零相電圧検出要素（OVG）が動作、
零相電流検出要素（OCG）が不動作でインヒビット回路
（IN−１）、OR回路（OR）からヒューズ断が検出され
る。(A). When the one-phase or two-phase fuse is blown The zero-phase voltage detection element (OVG) operates in the same way as the conventional device,
The zero-phase current detection element (OCG) is not operating and the fuse blown is detected from the inhibit circuit (IN-1) and OR circuit (OR).
（ロ）．系統送電線A,B,Cに１層地絡故障が発生した場
合 従来の装置と同様に、零相電圧検出要素（OVG）、零相
電流検出要素（OCG）が共に動作するので、インヒビッ
ト回路（IN−１）、OR回路（OR）からヒューズ断検出の
出力が不要に生じることはない。(B). When a one-layer ground fault occurs on the grid transmission lines A, B, C As with the conventional device, the zero-phase voltage detection element (OVG) and the zero-phase current detection element (OCG) operate together, so the inhibit circuit (IN-1) and the output of the fuse blown detection from the OR circuit (OR) are not generated unnecessarily.
（ハ）.3相のヒューズが断となった場合。(C). When the 3-phase fuse is blown.
３相全てのヒューズが断となった場合は、零相電圧V0が
発生しないので、零相電圧検出要素（OVG）が動作せ
ず、インヒビット（IN−１）からは出力は得られない
が、この発明により付加されたヒューズ電圧検出要素
（OV）が動作し、OR回路（OR）からヒューズ断が検出で
きる。When the fuses of all three phases are blown, the zero-phase voltage V 0 does not occur, so the zero-phase voltage detection element (OVG) does not operate and no output can be obtained from the inhibit (IN-1). The fuse voltage detection element (OV) added according to the present invention operates, and the blown fuse can be detected from the OR circuit (OR).
なお、以上の説明では、ヒューズ断検出要素（OV）をＡ
相に設置する場合について説明したが、Ｂ相又はＣ相に
設けても同様の効果が得られる。In the above description, the fuse blow detection element (OV) is
Although the case where it is provided in the phase has been described, the same effect can be obtained by providing it in the B phase or the C phase.
以上のように、この発明によれば、従来の装置に加えて
被検出ヒューズの内のいずれか１相のヒューズの両端電
圧を検出するヒューズ電圧検出要素を設けるとともに、
零相電圧検出要素の出力があって零相電流検出要素の出
力がない場合、又はヒューズ電圧検出要素の出力がある
場合に被検出ヒューズの断を検出する論理回路を備える
構成としたので１相、２相のヒューズ断はもちろん、３
相全てのヒューズ断も検出できる高信頼度のヒューズ断
検出装置が得られるとともに、ヒューズ電圧検出要素は
いずれか１相分のみに設ければよいので、３相分設ける
場合に比べて、回路構成が簡単で使用部品が少なく、省
スペース，高信頼度，低コスト等の効果がある。As described above, according to the present invention, in addition to the conventional device, the fuse voltage detection element for detecting the voltage across the fuse of any one of the detected fuses is provided, and
Since the configuration is provided with a logic circuit that detects the blown of the detected fuse when there is an output of the zero-phase voltage detection element and no output of the zero-phase current detection element, or when there is an output of the fuse voltage detection element Not to mention the two-phase fuse blowout, 3
A highly reliable fuse blowout detection device capable of detecting blowouts of all the phases can be obtained, and the fuse voltage detection element only needs to be provided for any one phase. It is easy to use, has few parts, and has advantages such as space saving, high reliability, and low cost.
第１図はこの発明の一実施例によるヒューズ断検出装置
のブロック図、第２図は従来のヒューズ断検出装置のブ
ロック図である。 図において、（Ａ）（Ｂ）（Ｃ）は被保護送電線、（C
B）はしゃ断器、（CTA）（CTB）（CTC）は変流器、（PT
A）（PTB）（PTC）は電圧変成器、（FA）（FB）（FC）
は被検出ヒューズ、（OVG）は零相電圧検出要素、（OC
G）は零相電流検出要素、（OV）はヒューズ電圧検出要
素、（IN−１）はインヒビット回路、（OR）はOR回路で
ある。 なお図中、同一符号は同一または相当部分を示す。FIG. 1 is a block diagram of a fuse blown detection device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional fuse blown detection device. In the figure, (A), (B) and (C) are protected transmission lines, and (C
B) is a circuit breaker, (CT A ) (CT B ) (CT C ) is a current transformer, (PT
A ) (PT B ) (PT C ) are voltage transformers, (F A ) (F B ) (F C ).
Is a fuse to be detected, (OVG) is a zero-phase voltage detection element, (OC
G) is a zero-phase current detection element, (OV) is a fuse voltage detection element, (IN-1) is an inhibit circuit, and (OR) is an OR circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
相の被検出ヒューズの２次側に接続された零相電圧検出
要素、系統に接続された変流器の２次側に接続された零
相電流検出要素、及び上記３相の被検出ヒューズのいず
れか１相の両端に接続されたヒューズ電圧検出要素を備
え、零相電圧検出要素の出力があって零相電流検出要素
の出力がない場合、又はヒューズ電圧検出要素の出力が
ある場合に被検出ヒューズの断を検出する論理回路を備
えたことを特徴とするヒューズ断検出装置。1. A secondary side 3 of a voltage transformer connected to a grid.
Of the zero-phase voltage detecting element connected to the secondary side of the phase-detected fuse, the zero-phase current detecting element connected to the secondary side of the current transformer connected to the system, and the three-phase detected fuse A fuse voltage detection element connected to both ends of any one phase is provided, and when the output of the zero-phase voltage detection element is present and the output of the zero-phase current detection element is not present, or when the output of the fuse voltage detection element is present, it is detected. A fuse blowout detection device comprising a logic circuit for detecting blown detection fuses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62047022A JPH07106019B2 (en) | 1987-03-02 | 1987-03-02 | House disconnection detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62047022A JPH07106019B2 (en) | 1987-03-02 | 1987-03-02 | House disconnection detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63213405A JPS63213405A (en) | 1988-09-06 |
| JPH07106019B2 true JPH07106019B2 (en) | 1995-11-13 |
Family
ID=12763555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62047022A Expired - Lifetime JPH07106019B2 (en) | 1987-03-02 | 1987-03-02 | House disconnection detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07106019B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61247211A (en) * | 1985-04-24 | 1986-11-04 | 三菱電機株式会社 | Fuse out detector |
-
1987
- 1987-03-02 JP JP62047022A patent/JPH07106019B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63213405A (en) | 1988-09-06 |
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