JP5381415B2 - Distribution line protection system and protection relay - Google Patents

Distribution line protection system and protection relay Download PDF

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JP5381415B2
JP5381415B2 JP2009156957A JP2009156957A JP5381415B2 JP 5381415 B2 JP5381415 B2 JP 5381415B2 JP 2009156957 A JP2009156957 A JP 2009156957A JP 2009156957 A JP2009156957 A JP 2009156957A JP 5381415 B2 JP5381415 B2 JP 5381415B2
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accident
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ground fault
relay
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JP2011015517A (en
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直毅 増田
俊夫 野村
耕二 前田
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Mitsubishi Electric Corp
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Description

本発明は、複数の区分開閉器により区切られた配電線の地絡事故の発生時、事故区間を切り離して健全区間の給電を継続する配電線の保護システムに関するものである。 The present invention relates to a distribution line protection system that disconnects an accident section and continues power supply in a healthy section when a ground fault occurs in the distribution line partitioned by a plurality of section switches.

電力設備の配電系統においては、地絡事故が発生すると遮断器及びその下流に縦列配置された常閉の複数の区分開閉器を一旦開放させ、事故区間より上流側の健全区間を順次復旧させた後に、下流に設けられ他の配電系統に連結した常開の連系開閉器を投入して事故区間より下流側の健全区間に給電している。 In the distribution system of power facilities, when a ground fault occurred, the circuit breaker and a plurality of normally closed section switches arranged in tandem downstream were once opened, and the healthy section upstream from the accident section was restored sequentially. Later, a normally open interconnection switch provided downstream and connected to another power distribution system is inserted to supply power to the healthy section downstream from the accident section.

上記のような方法では、地絡事故発生時に遮断器及び区分開閉器を全て一旦開放させるため、健全区間を復旧させるまでに時間がかかる。そこで従来、遮断器及び区分開閉器を開放するまでのタイムアップ時間を配電線の下流側ほど短く設定した地絡保護装置を用い、事故区間直前の区分開閉器が事故を検出して開放すると、事故区間より下流側の区分開閉器がこれに連動して自然開放することで事故区間が切り離され、その後連系開閉器を投入することで事故区間より下流側の健全区間に給電する配電線の保護システムがある。（例えば、特許文献１参照）。 In the method as described above, since all the circuit breakers and the section switches are once opened when a ground fault occurs, it takes time to restore the healthy section. Therefore, conventionally, when using a ground fault protection device in which the time-up time until the circuit breaker and the section switch are opened is set shorter toward the downstream side of the distribution line, the section switch immediately before the accident section detects the accident and opens it. The section switch on the downstream side of the accident section is naturally opened in conjunction with this, the accident section is disconnected, and then the distribution switch that feeds the healthy section downstream from the accident section by turning on the interconnection switch There is a protection system. (For example, refer to Patent Document 1).

特開平９−１９０５４号JP-A-9-19054

上記のような配電線の保護システムにおいては、各区分開閉器のタイムアップ時間は下流側ほど短く設定されているため、配電線の上流側で発生した事故検出が下流側で発生した事故検出よりも時間がかかり、事故の発生位置によって事故区間より下流側の健全区間における復旧時間が変動するという問題がある。 In the distribution line protection system as described above, the time-up time of each section switch is set to be shorter on the downstream side, so the accident detection that occurred upstream of the distribution line is detected more than the accident detection that occurred downstream. However, there is a problem that the restoration time in the healthy section downstream from the accident section varies depending on the position where the accident occurs.

本発明は上記のような問題を解決するためになされたもので、事故区間より下流側の健全区間における復旧時間が事故の発生位置によって変動することがなく、信頼性の高い配電線の保護システムを得ることを目的とする。 The present invention has been made to solve the above-described problems, and the recovery time in a healthy section downstream from the accident section does not vary depending on the position where the accident occurs, and the distribution line protection system is highly reliable. The purpose is to obtain.

本発明に係る配電線の保護システムは、母線に遮断器を介して接続され、縦列配置された複数の区分開閉器を有する第１及び第２の配電線と、前記第１及び第２の配電線の連系点に設けられた常開の連系開閉器とを有し、前記配電線の地絡事故発生時に前記遮断器又は前記区分開閉器を開放して事故区間を切り離し、健全区間に給電する配電線の保護システムにおいて、前記遮断器、前記区分開閉器及び前記連系開閉器毎に設けられ、前記配電線上の地絡事故及びその地絡方向を検出する検出手段を有する保護継電器を備え、前記保護継電器は、自己の検出手段による情報を地絡方向側に隣接する保護継電器へ送信する送信手段と、前記隣接する保護継電器の検出手段による情報を受信する受信手段と、前記送信手段により情報を送信した側に隣接する保護継電器から、前記母線に接続される前記遮断器が開放されるまでの所定時間内に、前記受信手段により情報を受信すると事故区間に隣接する保護継電器であると判定し、当該情報を受信しなければ事故区間に隣接しないと判定する事故判定手段と、前記事故判定手段の判定結果に基づいて前記遮断器、前記区分開閉器及び前記連系開閉器を制御する制御手段とを有し、前記地絡事故発生時に前記事故判定手段が事故区間に隣接する保護継電器であると判定すると、事故区間に隣接する前記遮断器及び前記区分開閉器を、前記母線に接続される前記遮断器が開放されるまでに開放し、前記地絡事故の上流及び下流のそれぞれに設けられた前記地絡事故に隣接しない前記遮断器及び前記区分開閉器を投入状態に維持すると共に、前記事故判定手段が事故区間に隣接する保護継電器であると判定した前記保護継電器が、前記送信手段が送信する前記情報とは別に前記連系開閉器に備えられた保護継電器に対して投入信号を送信することで、前記連系開閉器を前記母線に接続される前記遮断器が開放されるまでに投入する。

The distribution line protection system according to the present invention includes a first and a second distribution line connected to a bus line via a circuit breaker and having a plurality of section switches arranged in tandem, and the first and second distribution lines. A normally open connection switch provided at the connection point of the wire, and when the ground fault of the distribution line occurs, open the circuit breaker or the section switch to separate the accident section, and to make a healthy section In a protection system for a distribution line to be fed, a protection relay provided for each of the circuit breaker, the section switch, and the interconnection switch, and having a detection means for detecting a ground fault on the distribution line and a ground fault direction. The protective relay includes: transmission means for transmitting information by its own detection means to a protective relay adjacent to the ground fault direction side; reception means for receiving information by the detection means of the adjacent protective relay; and the transmission means The side that sent the information by When receiving information by the receiving means within a predetermined time from the adjacent protective relay until the circuit breaker connected to the bus is opened, it is determined that the protective relay is adjacent to the accident section, and the information is Accident determination means for determining that it is not adjacent to the accident section if not received, and control means for controlling the circuit breaker, the section switch, and the interconnection switch based on the determination result of the accident determination means When the fault determination means determines that the protective relay is adjacent to the accident section when the ground fault occurs, the circuit breaker connected to the bus is connected to the breaker and the section switch adjacent to the accident section. The circuit breaker and the section switch not opened adjacent to the ground fault accident provided upstream and downstream of the ground fault accident, respectively, are kept in the on state before being opened. The protective relay determined that the accident determination means is a protective relay adjacent to the accident section transmits an input signal to the protective relay provided in the interconnection switch separately from the information transmitted by the transmission means. Thus, the interconnection switch is turned on until the circuit breaker connected to the bus is opened .

本発明によれば、遮断器、区分開閉器及び連系開閉器毎に設けられた保護継電器は地絡事故及びその地絡方向を検出し、自己の検出情報を地絡方向側に隣接する保護継電器へ送信し、その隣接する保護継電器における検出情報を受信すると事故区間に隣接する保護継電器であると判定して、事故区間に隣接する遮断器及び区分開閉器を開放すると共に連系開閉器を投入することにより、事故区間より下流側の健全区間における復旧時間が事故の発生位置によって変動することが無く、信頼性の高い配電線の保護システムを得ることができる。 According to the present invention, the protective relay provided for each circuit breaker, section switch, and interconnection switch detects a ground fault and its ground fault direction, and protects its own detection information adjacent to the ground fault direction side. When it is transmitted to the relay and the detection information in the adjacent protective relay is received, it is determined that the protective relay is adjacent to the accident section, and the circuit breaker and the section switch adjacent to the accident section are opened and the interconnection switch is opened. By introducing, the recovery time in the healthy section downstream from the accident section does not vary depending on the position where the accident occurs, and a highly reliable distribution line protection system can be obtained.

本発明の実施の形態１に係る配電線の保護システムの構成を示す図である。It is a figure which shows the structure of the protection system of the distribution line which concerns on Embodiment 1 of this invention. 図１における保護継電器の機能ブロックを示す図である。It is a figure which shows the functional block of the protection relay in FIG. 図２における保護継電器の回路構成の一例を示す図である。It is a figure which shows an example of the circuit structure of the protection relay in FIG. 図２における保護継電器の動作を示すフローチャートである。It is a flowchart which shows the operation | movement of the protection relay in FIG. 図１における配自サーバで用いる周波数管理表の一例を示す図である。It is a figure which shows an example of the frequency management table used with the allocation server in FIG. 本発明の実施の形態２に係る保護継電器の機能ブロックを示す図である。It is a figure which shows the functional block of the protection relay which concerns on Embodiment 2 of this invention. 図６における保護継電器の動作を示すフローチャートである。It is a flowchart which shows the operation | movement of the protection relay in FIG. 本発明の実施の形態３に係る保護継電器の機能ブロックを示す図である。It is a figure which shows the functional block of the protection relay which concerns on Embodiment 3 of this invention.

実施の形態１．
本発明を実施するための実施の形態１における配電線の保護システム１を図１ないし図４を用いて説明する。図１において、配電線の保護システム１は、配電用変電所に設けられた変圧器２に遮断器３ａを介して接続された母線５と、母線５に遮断器３ｂを介して接続された配電線４と、配電線４に縦列配置された常閉の複数の区分開閉器６ａ〜６ｄと、この配電線４及び他の配電線との連系点に設けられた常開の連系開閉器７が設けられている。この連系開閉器７で連結される他の配電線は同じ配電系統に属するものであっても良いし、他の配電系統に属するものであっても良い。 Embodiment 1 FIG.
A distribution line protection system 1 according to Embodiment 1 for carrying out the present invention will be described with reference to FIGS. In FIG. 1, a distribution line protection system 1 includes a bus 5 connected to a transformer 2 provided in a distribution substation via a circuit breaker 3a, and a distribution line connected to the bus 5 via a circuit breaker 3b. A normally open interconnection switch provided at an interconnection point of the electric wire 4, a plurality of normally closed section switches 6a to 6d arranged in tandem with the distribution wire 4, and the distribution wire 4 and other distribution wires 7 is provided. The other distribution lines connected by the interconnection switch 7 may belong to the same distribution system or may belong to another distribution system.

遮断器３ｂ、区分開閉器６ａ〜６ｄ及び連系開閉器７は地絡事故及びその地絡方向を検出する保護継電器８ａ〜８ｆをそれぞれ有し、各保護継電器はそれぞれ情報伝達用の通信線９を介して接続されている。また、配電用変電所には通信線９で使用する周波数を管理する配自サーバ１１と、保護継電器８ａ〜８ｆとの間で通信線９を介して管理情報を送受信する通信親局１０が設けられている。 The circuit breaker 3b, the section switches 6a to 6d and the interconnection switch 7 have protective relays 8a to 8f for detecting a ground fault and the direction of the ground fault, and each protective relay has a communication line 9 for information transmission. Connected through. In addition, a distribution substation is provided with a distribution server 11 that manages the frequency used on the communication line 9 and a communication master station 10 that transmits and receives management information via the communication line 9 between the protective relays 8a to 8f. It has been.

保護継電器８ａ〜８ｆは、図２に示すように、地絡事故を検出する事故検出部８１及び地絡事故の方向を検出する地絡方向検出部８２からなる検出手段と、これらの検出情報を上流側（電源側）に隣接する保護継電器に送信する上流側の送信部８３と、下流側（負荷側）に隣接する保護継電器に送信する下流側の送信部８５と、上流側に隣接する保護継電器の情報を受信する上流側の受信部８４と、下流側に隣接する保護継電器の情報を受信する下流側の受信部８６を備えている。 As shown in FIG. 2, the protective relays 8 a to 8 f include detection means including an accident detection unit 81 that detects a ground fault and a ground fault direction detection unit 82 that detects the direction of the ground fault, and detection information thereof. An upstream transmission unit 83 that transmits to a protection relay adjacent to the upstream side (power supply side), a downstream transmission unit 85 that transmits to a protection relay adjacent to the downstream side (load side), and a protection adjacent to the upstream side An upstream receiving unit 84 that receives relay information and a downstream receiving unit 86 that receives information on a protective relay adjacent to the downstream side are provided.

また、上流側の送信部８３より送信する検出情報と上流側の受信部８４から受信する隣接する保護継電器の検出情報とに基づいて上流側の隣接区間における事故を判定する上流側の事故判定部８７と、下流側の送信部８５より送信する検出情報と下流側の受信部８６から受信する隣接する保護継電器の検出情報とに基づいて下流側の隣接区間における事故を判定する下流側の事故判定部８８を備え、上流側の事故判定部８７及び下流側の事故判定部８８の出力に基づいて遮断器、区分開閉器及び連系開閉器の開閉制御信号を出力する開閉制御部８９が設けられている。 Further, an upstream accident determination unit that determines an accident in an upstream adjacent section based on detection information transmitted from the upstream transmission unit 83 and detection information of an adjacent protective relay received from the upstream reception unit 84. 87, downstream accident determination that determines an accident in the downstream adjacent section based on the detection information transmitted from the downstream transmission unit 85 and the detection information of the adjacent protective relay received from the downstream reception unit 86 And an open / close control unit 89 that outputs an open / close control signal for the circuit breaker, the divisional switch, and the interconnected switch based on the outputs of the upstream accident determination unit 87 and the downstream accident determination unit 88. ing.

隣接する保護継電器どうしは、図３に示すように接続され、上流側の保護継電器における下流側の送信部８５から送信された信号は下流側の保護継電器における上流側の受信部８４で受信され、同様に下流側の保護継電器における上流側の送信部８３から送信された信号は上流側の保護継電器における下流側の受信部８６で受信される。
なお、ここでは保護継電器８ａ〜８ｆはＣＰＵを用いたソフトウェアを想定して説明するが、ハードウェアで構成しても良い。 Adjacent protection relays are connected as shown in FIG. 3, and a signal transmitted from the downstream transmission unit 85 in the upstream protection relay is received by the upstream reception unit 84 in the downstream protection relay, Similarly, the signal transmitted from the upstream transmission unit 83 in the downstream protection relay is received by the downstream reception unit 86 in the upstream protection relay.
Here, the protective relays 8a to 8f are described assuming software using a CPU, but may be configured by hardware.

保護継電器８ａ〜８ｆは、図４に示すように、事故検出部８１に入力された零相電流の大きさから地絡事故を検出すると、零相電流と零相電圧のなす角から、この保護継電器より下流側の事故であるか否かを地絡方向検出部８２で検出する。検出した地絡方向がこの保護継電器より下流側を示していれば、下流側の送信部８５より下流側に隣接する保護継電器へ事故検出及び地絡方向の情報を送信し、下流側の事故でなければ上流側の事故と判断して、上流側の送信部８３より上流側に隣接する保護継電器へこれらの情報を送信する。このとき、検出した地絡方向と異なる側に隣接する保護継電器に対しては何も情報を送信しない。   As shown in FIG. 4, the protective relays 8a to 8f detect the ground fault from the magnitude of the zero-phase current input to the accident detection unit 81, and from the angle formed by the zero-phase current and the zero-phase voltage, The ground fault direction detection unit 82 detects whether or not the accident is downstream of the relay. If the detected ground fault direction indicates the downstream side of this protective relay, the downstream transmission unit 85 transmits the fault detection and ground fault direction information to the protective relay adjacent to the downstream side. If not, it is determined that the accident is upstream, and the upstream transmission unit 83 transmits the information to the protective relay adjacent to the upstream. At this time, no information is transmitted to the protective relay adjacent to the side different from the detected ground fault direction.

また、保護継電器８ａ〜８ｆは上流側の受信部８４より事故検出及び地絡方向の情報を受信すると上流側の事故判定部８７にも伝達し、下流側の受信部８６より事故検出及び地絡方向の情報を受信すると下流側の事故判定部８８にも伝達する。 Further, when the protective relays 8a to 8f receive the accident detection and ground fault direction information from the upstream receiving unit 84, the protective relays 8a to 8f also transmit the information to the upstream accident determining unit 87, and the downstream detection unit 86 detects the accident and ground fault. When the direction information is received, it is also transmitted to the accident determination unit 88 on the downstream side.

上流側の事故判定部８７は上流側の送信部８３及び上流側の受信部８４の双方より情報を伝達されると、上流側に隣接する保護継電器との間を事故区間と判定して開閉制御部８９へ信号を出力する。同様に、下流側の事故判定部８８は下流側の送信部８５及び下流側の受信部８６の双方より情報を伝達されると、下流側に隣接する保護継電器との間を事故区間と判定して開閉制御部８９へ信号を出力する。このとき、自己の地絡方向と受信した隣接する保護継電器の地絡方向が異なると事故区間に隣接すると判定することで、より正確な判定もできる。 When the upstream accident determination unit 87 receives information from both the upstream transmission unit 83 and the upstream reception unit 84, the upstream accident determination unit 87 determines an accident section between the upstream upstream protection relay and the switching control. A signal is output to the unit 89. Similarly, when the downstream accident determination unit 88 receives information from both the downstream transmission unit 85 and the downstream reception unit 86, the downstream accident determination unit 88 determines that there is an accident section between the protection relay adjacent to the downstream side. And outputs a signal to the open / close control unit 89. At this time, more accurate determination can be performed by determining that it is adjacent to the accident section if its own ground fault direction and the received ground fault direction of the adjacent protective relay are different.

開閉制御部８９は上流側の事故判定部８７又は下流側の事故判定部８８の少なくとも一方から信号を受信すると、事故区間に隣接する保護継電器であるとして、この保護継電器８ａ〜８ｅを備えた常閉の遮断器３ｂ又は区分開閉器６ａ〜６ｄを開放すると共に、常開の連系開閉器７に備えられた保護継電器８ｆへ投入信号を出力する。 When the switching control unit 89 receives a signal from at least one of the upstream side accident determination unit 87 or the downstream side accident determination unit 88, it is assumed that the switching control unit 89 is a protective relay adjacent to the accident section, and is normally provided with the protective relays 8a to 8e. The closed circuit breaker 3b or the division switches 6a to 6d are opened, and a closing signal is output to the protective relay 8f provided in the normally open interconnection switch 7.

連系開閉器７に備えられた保護継電器８ｆは、自己の開閉制御部８９が上流側の事故判定部８７及び下流側の事故判定部８８のどちらからも信号を受信していなければ事故区間に隣接していないと判定し、他の保護継電器８ａ〜８ｅからの投入信号に従って連系開閉器７を投入する。これにより、事故発生から所定時間内に事故区間に隣接する各保護継電器を遮断器、区分開閉器を開放すると共に、連系開閉器を投入して事故区間より下流側の健全区間を復旧できる。 The protective relay 8f provided in the interconnection switch 7 is in an accident section unless its own switching control unit 89 receives a signal from either the upstream accident determination unit 87 or the downstream accident determination unit 88. It determines with not adjoining, and the interconnection switch 7 is thrown in according to the making signal from other protection relays 8a-8e. Thereby, within a predetermined time from the occurrence of the accident, the protective relay adjacent to the accident section is opened and the section switch is opened, and the interconnection switch is turned on to restore the healthy section downstream from the accident section.

一方、連系開閉器７に備えられた保護継電器８ｆの開閉制御部８９が上流側の事故判定部８７又は下流側の事故判定部８８の少なくとも一方から信号を受信していれば事故区間に隣接していると判定し、連系開閉器７の開放状態を維持する。この場合、連系開閉器７より下流側の健全区間は存在しないため給電する必要は無い。 On the other hand, if the switching control unit 89 of the protective relay 8f provided in the interconnection switch 7 receives a signal from at least one of the upstream accident determination unit 87 or the downstream accident determination unit 88, it is adjacent to the accident section. It determines with having carried out, and the open state of the interconnection switch 7 is maintained. In this case, since there is no healthy section downstream from the interconnection switch 7, there is no need to supply power.

ところで、保護継電器８ａ〜８ｆは、上流側の事故判定部８７において、上流側の送信部８３から検出情報を送信しても所定時間内に上流側の受信部８４から受信しない場合、この保護継電器８ａ〜８ｆの上流側に隣接する区間における事故ではないと判定して自己の事故検出及び地絡方向の情報をリセットする。同様に、下流側の事故判定部８８において、下流側の送信部８５から検出情報を送信しても所定時間内に下流側の受信部８６から受信しない場合、この保護継電器８ａ〜８ｆの下流側に隣接する区間における事故ではないと判定して自己の事故検出及び地絡方向の情報をリセットする。これにより、事故区間に隣接しない保護継電器は次の事故に備えて自己回復が可能となる。 By the way, the protective relays 8a to 8f are provided in the upstream accident determination unit 87 when the detection information is transmitted from the upstream transmission unit 83 and is not received from the upstream reception unit 84 within a predetermined time. It is determined that there is no accident in the section adjacent to the upstream side of 8a to 8f, and its own accident detection and ground fault direction information are reset. Similarly, if the downstream accident determination unit 88 does not receive the detection information from the downstream reception unit 86 within a predetermined time even if the detection information is transmitted from the downstream transmission unit 85, the downstream side of the protective relays 8a to 8f. It is determined that there is no accident in the section adjacent to, and its own accident detection and ground fault direction information are reset. As a result, the protective relay not adjacent to the accident section can be self-recovered in preparation for the next accident.

次に、動作について説明する。
配自サーバ１１は各保護継電器８ａ〜８ｆが送受信する信号が混信しないよう、例えば図５に示すような周波数管理テーブルを設けて使用する周波数を区間毎に管理する。ここで管理される情報は通信親局１０及び各保護継電器８ａ〜８ｆの間で周波数Ｆ１３、Ｆ１４を用いて伝達される。また、配自サーバ１１は連系開閉器７の投入時限を設定し、使用周波数と同様に通信親局１０を介して連系開閉器７の保護継電器８ｆに通知する。このとき、連系開閉器７の投入時限は事故発生後、遮断器３ｂを開放するまでの時間（通常は１秒程度）よりも短く設定する。 Next, the operation will be described.
For example, the allocation server 11 manages a frequency to be used for each section by providing a frequency management table as shown in FIG. 5, for example, so that signals transmitted and received by the protection relays 8a to 8f do not interfere with each other. Information managed here is transmitted between the communication master station 10 and the protection relays 8a to 8f using the frequencies F13 and F14. Further, the allocation server 11 sets the closing time of the interconnection switch 7 and notifies the protection relay 8f of the interconnection switch 7 via the communication master station 10 in the same manner as the operating frequency. At this time, the closing time of the interconnection switch 7 is set to be shorter than the time (usually about 1 second) until the circuit breaker 3b is opened after the accident occurs.

例えば図１に示す区分開閉器６ｂと区分開閉器６ｃの間で地絡事故が発生すると、保護継電器８ａは下流側に隣接する保護継電器８ｂに事故検出及び地絡方向の情報を送信するものの、保護継電器８ｂからは何も情報を受信しないため、自身の隣接区間における事故ではないと判定して開閉制御信号を出力せず、区分開閉器６ａの投入状態を維持する。同様に、保護継電器８ｅは下流側に隣接する保護継電器８ａから情報を受信せず、保護継電器８ｄ、８ｆは上流側に隣接する保護継電器８ｃ、８ｄから情報を受信しないため、常閉の遮断器３ｂ及び区分開閉器６ｄも投入状態を維持し、常開の連系開閉器７は開放状態を維持する。 For example, when a ground fault occurs between the section switch 6b and the section switch 6c shown in FIG. 1, the protective relay 8a transmits information on the accident detection and the ground fault direction to the protective relay 8b adjacent to the downstream side. Since no information is received from the protective relay 8b, it is determined that it is not an accident in its own adjacent section, and no switching control signal is output, and the switched-on switch 6a is kept on. Similarly, since the protective relay 8e does not receive information from the protective relay 8a adjacent to the downstream side, and the protective relays 8d and 8f do not receive information from the protective relays 8c and 8d adjacent to the upstream side, the normally closed circuit breaker 3b and the division switch 6d also maintain the input state, and the normally open interconnection switch 7 maintains the open state.

これに対し、保護継電器８ｂは下流側に隣接する保護継電器８ｃとの間で周波数Ｆ５、Ｆ６を用いて検出情報を送受信し、下流側の隣接区間における事故と判定して区分開閉器６ｂを開放すると共に、連系開閉器７に備えられた保護継電器８ｆへ周波数Ｆ１２を用いて投入信号を出力する。同様に、保護継電器８ｃは上流側に隣接する保護継電器８ｂとの間で検出情報を送受信して上流側の隣接区間における事故と判定し、区分開閉器６ｃを開放すると共に連系開閉器７の保護継電器８ｆへ投入信号を出力する。連系開閉器７の保護継電器８ｆは、保護継電器８ｂ、８ｃより投入信号を受信すると、自身は事故区間に隣接していないので開放状態を維持しているが、予め設定された投入時限だけ待って連系開閉器７を投入する。このように各保護継電器８ａ〜８ｆを動作させることにより、事故発生から事故区間より下流側の健全区間に給電するまでの総時間は０．４秒程度となり、瞬時停電よりも短い無停電状態で復旧できる。
なお、一般に、区分開閉器６ａ〜６ｄの開閉制御は遮断器３よりも先に行われるため、事故区間が区分開閉器６ａ〜６ｄの間であれば、遮断器３ｂの遮断時間より前に事故区間に隣接する区分開閉器を開放して事故区間を切り離し、連系開閉器７を投入することにより、事故区間より上流側の健全区間は無停電のまま給電される。 On the other hand, the protection relay 8b transmits and receives detection information using the frequencies F5 and F6 to and from the protection relay 8c adjacent to the downstream side, and determines that there is an accident in the adjacent section on the downstream side and opens the section switch 6b. In addition, a closing signal is output to the protective relay 8f provided in the interconnection switch 7 using the frequency F12. Similarly, the protective relay 8c transmits / receives detection information to / from the upstream adjacent protective relay 8b to determine an accident in the upstream adjacent section, opens the section switch 6c, and opens the connection switch 7 A closing signal is output to the protective relay 8f. When the protective relay 8f of the interconnection switch 7 receives the closing signal from the protective relays 8b and 8c, it keeps the open state because it is not adjacent to the accident section, but waits for the preset closing time. Then turn on the interconnection switch 7. By operating each of the protective relays 8a to 8f in this way, the total time from the occurrence of an accident to feeding the healthy section downstream from the accident section is about 0.4 seconds, and in an uninterruptible state shorter than an instantaneous power failure It can be recovered.
In general, since the switching control of the division switches 6a to 6d is performed before the circuit breaker 3, if the accident section is between the division switches 6a to 6d, the accident occurs before the interruption time of the circuit breaker 3b. By opening the section switch adjacent to the section, separating the accident section, and turning on the interconnection switch 7, the healthy section upstream from the accident section is supplied with power without interruption.

この実施の形態によれば、保護継電器８ａ〜８ｆは事故発生時に地絡事故とその地絡方向を検出し、自己の検出情報を地絡方向側に隣接する保護継電器へ送信し、その隣接する保護継電器における検出情報を受信すると事故区間に隣接する保護継電器であると判定して、事故区間に隣接する遮断器３ｂ及び区分開閉器６ａ〜６ｄを開放すると共に連系開閉器７を投入することにより、事故区間より下流側の健全区間における復旧時間が事故の発生位置によって変動することが無く、信頼性の高い配電線の保護システムを得ることができる。 According to this embodiment, the protective relays 8a to 8f detect a ground fault and the direction of the ground fault when an accident occurs, and transmit their own detection information to the protective relay adjacent to the ground fault direction side. When the detection information in the protective relay is received, it is determined that the protective relay is adjacent to the accident section, and the circuit breaker 3b and the section switches 6a to 6d adjacent to the accident section are opened and the interconnection switch 7 is turned on. Thus, the recovery time in the healthy section downstream from the accident section does not vary depending on the position where the accident occurs, and a highly reliable distribution line protection system can be obtained.

また、保護継電器８ａ〜８ｆは、地絡方向検出部８２で検出した自己の地絡方向と受信した隣接する保護継電器の地絡方向とが異なる場合に事故区間に隣接する保護継電器であると判定することにより、より正確に判定できる。 Further, the protection relays 8a to 8f are determined to be protection relays adjacent to the accident section when the ground fault direction detected by the ground fault direction detection unit 82 is different from the received ground fault direction of the adjacent protection relay. This makes it possible to determine more accurately.

また、保護継電器８ａ〜８ｆは、事故を検出してから所定時間内に地絡方向側に隣接する保護継電器から検出情報を受信せず、事故区間に隣接する保護継電器であると判定しない場合に自己の検出結果をリセットすることにより、次の事故に備えて自己回復が可能となる。 Further, when the protective relays 8a to 8f do not receive the detection information from the protective relay adjacent to the ground fault direction within a predetermined time after detecting the accident, and do not determine that the protective relay is adjacent to the accident section. By resetting the self-detection result, self-recovery is possible in preparation for the next accident.

実施の形態２．
上記実施の形態１では、保護継電器８ａ〜８ｆは地絡方向に隣接する保護継電器との間で検出情報を送受信することにより事故判定を行っている。実施の形態２では、上流側及び下流側に隣接する保護継電器との間でそれぞれ検出情報を送受信し、自己の検出情報及び隣接する保護継電器から受信した情報とに基づき事故判定を行う。 Embodiment 2. FIG.
In the first embodiment, the protective relays 8a to 8f perform the accident determination by transmitting and receiving the detection information between the protective relays adjacent in the ground fault direction. In the second embodiment, detection information is transmitted / received between the upstream and downstream protection relays, and an accident determination is performed based on the own detection information and information received from the adjacent protection relay.

保護継電器８ａ〜８ｆは、図６に示すように、事故を検出すると上流側と下流側に隣接する保護継電器に事故検出及び地絡方向の情報を送信する上流側の送信部８３および下流側の送信部８５と、事故検出部８１及び地絡方向検出部８２の情報と上流側の受信部８４から受信した情報とに基づいて隣接区間における事故を判定する上流側の事故判定部８７と、事故検出部８１及び地絡方向検出部８２の検出情報と下流側の受信部８６から受信した情報とに基づいて下流側の隣接区間における事故を判定する下流側の事故判定部８８が設けられている。その他の構成については実施の形態１と同じである。 As shown in FIG. 6, the protective relays 8 a to 8 f include an upstream transmission unit 83 that transmits an accident detection and ground fault direction information to a protective relay adjacent to the upstream side and the downstream side when an accident is detected. A transmission unit 85, an upstream accident determination unit 87 for determining an accident in an adjacent section based on the information of the accident detection unit 81 and the ground fault direction detection unit 82 and the information received from the upstream reception unit 84; A downstream accident determination unit 88 that determines an accident in a downstream adjacent section based on detection information of the detection unit 81 and the ground fault direction detection unit 82 and information received from the downstream reception unit 86 is provided. . Other configurations are the same as those in the first embodiment.

図７に示すように、保護継電器８ａ〜８ｆは事故検出部８１に入力された零相電流の大きさから地絡事故を検出すると、地絡方向検出部８２によりこの保護継電器より下流側の事故であるか否かをみて、地絡方向が下流側であれば下流側の送信部８５より隣接する保護継電器へ事故検出及び地絡方向の情報を送信し、下流側の事故でなければ上流側の送信部８３より隣接する保護継電器へこれらの情報を送信する。このとき、事故検出部８１及び地絡方向検出部８２は検出した情報を上流側の事故判定部８７及び下流側の事故判定部８８にもそれぞれ伝達する。   As shown in FIG. 7, when the protective relays 8 a to 8 f detect a ground fault from the magnitude of the zero-phase current input to the fault detection unit 81, the fault on the downstream side of the protective relay is detected by the ground fault direction detection unit 82. If the ground fault direction is on the downstream side, the downstream transmission unit 85 transmits the accident detection and ground fault direction information to the adjacent protective relay, and if the ground fault direction is not on the downstream side, the upstream side The transmission unit 83 transmits these pieces of information to the adjacent protective relay. At this time, the accident detection unit 81 and the ground fault direction detection unit 82 transmit the detected information to the upstream accident determination unit 87 and the downstream accident determination unit 88, respectively.

上流側の受信部８４及び下流側の受信部８６は、隣接する保護継電器より事故検出及び地絡方向の情報を受信すると、上流側の事故判定部８７又は下流側の事故判定部８８へそれぞれ伝達する。上流側の事故判定部８７は、自己の事故検出部８１及び地絡方向検出部８２による情報が上流側の地絡事故を示し、上流側の受信部８４より伝達された情報が下流側の地絡事故を示していれば事故区間に隣接していると判定して開閉制御部８９へ信号を出力し、自己の検出情報が上流側の地絡事故を示しているものの上流側の受信部８４より伝達された情報も上流側の地絡事故を示している、もしくは上流側の受信部８４より情報が伝達されない場合は隣接区間における事故ではないと判定して事故検出部８１及び地絡方向検出部８２の結果をリセットする。 When the upstream receiving unit 84 and the downstream receiving unit 86 receive accident detection and ground fault direction information from adjacent protective relays, the upstream receiving unit 84 and the downstream receiving unit 86 respectively transmit the information to the upstream accident determination unit 87 or the downstream accident determination unit 88. To do. The upstream accident determination unit 87 indicates that the information from its own accident detection unit 81 and ground fault direction detection unit 82 indicates an upstream ground fault, and the information transmitted from the upstream reception unit 84 is the downstream side ground fault. If it indicates a fault, it is determined that it is adjacent to the fault section, and a signal is output to the open / close control unit 89. Although the detection information of itself indicates an upstream ground fault, the upstream receiving unit 84 If the information transmitted also indicates an upstream ground fault, or if the information is not transmitted from the upstream receiving unit 84, it is determined that the accident is not in the adjacent section, and the accident detection unit 81 and the ground fault direction detection. The result of the part 82 is reset.

同様に、下流側の事故判定部８８は、自己の事故検出部８１及び地絡方向検出部８２による情報が下流側の地絡事故を示し、下流側の受信部８６より伝達された情報が上流側の地絡事故を示していれば事故区間に隣接していると判定して開閉制御部８９へ信号を出力し、自己の検出情報が下流側の地絡事故を示しているものの下流側の受信部８６より伝達された情報も下流側の地絡事故を示している、もしくは下流側の受信部８６より情報が伝達されない場合は隣接区間における事故ではないと判定して事故検出部８１及び地絡方向検出部８２の結果をリセットする。 Similarly, the downstream accident determination unit 88 indicates that the information from its own accident detection unit 81 and ground fault direction detection unit 82 indicates a downstream ground fault, and the information transmitted from the downstream reception unit 86 is upstream. If it indicates a ground fault on the side, it is determined that it is adjacent to the accident section, and a signal is output to the opening / closing control unit 89. If the information transmitted from the receiver 86 also indicates a ground fault on the downstream side, or if information is not transmitted from the receiver 86 on the downstream side, it is determined that the accident is not in an adjacent section, and the accident detector 81 and the ground The result of the entrainment direction detection unit 82 is reset.

開閉制御部８９は上流側の事故判定部８７又は下流側の事故判定部８８の少なくとも一方から信号を受信すると、事故区間に隣接する保護継電器であるとして、この保護継電器８ａ〜８ｅを備えた常閉の遮断器３ｂ又は区分開閉器６ａ〜６ｄを開放すると共に、常開の連系開閉器７に備えられた保護継電器８ｆへ投入信号を出力する。 When the switching control unit 89 receives a signal from at least one of the upstream side accident determination unit 87 or the downstream side accident determination unit 88, it is assumed that the switching control unit 89 is a protective relay adjacent to the accident section, and is normally provided with the protective relays 8a to 8e. The closed circuit breaker 3b or the division switches 6a to 6d are opened, and a closing signal is output to the protective relay 8f provided in the normally open interconnection switch 7.

連系開閉器７に備えられた保護継電器８ｆは、自己の開閉制御部８９が上流側の事故判定部８７及び下流側の事故判定部８８のどちらからも信号を受信していなければ事故区間に隣接していないと判定し、他の保護継電器８ａ〜８ｅからの投入信号に従って連系開閉器７を投入する。これにより、事故発生から所定時間内に事故区間に隣接する各保護継電器を遮断器、区分開閉器を開放すると共に、連系開閉器を投入して事故区間より下流側の健全区間を復旧できる。 The protective relay 8f provided in the interconnection switch 7 is in an accident section unless its own switching control unit 89 receives a signal from either the upstream accident determination unit 87 or the downstream accident determination unit 88. It determines with not adjoining, and the interconnection switch 7 is thrown in according to the making signal from other protection relays 8a-8e. Thereby, within a predetermined time from the occurrence of the accident, the protective relay adjacent to the accident section is opened and the section switch is opened, and the interconnection switch is turned on to restore the healthy section downstream from the accident section.

一方、連系開閉器７に備えられた保護継電器８ｆの開閉制御部８９が上流側の事故判定部８７又は下流側の事故判定部８８の少なくとも一方から信号を受信していれば事故区間に隣接していると判定し、連系開閉器７の開放状態を維持する。 On the other hand, if the switching control unit 89 of the protective relay 8f provided in the interconnection switch 7 receives a signal from at least one of the upstream accident determination unit 87 or the downstream accident determination unit 88, it is adjacent to the accident section. It determines with having carried out, and the open state of the interconnection switch 7 is maintained.

また、保護継電器８ａ〜８ｆは、上流側の事故判定部８７において上流側の隣接区間における事故ではないと判定する、あるいは下流側の事故判定部８８において下流側の隣接区間における事故ではないと判定すると、自己の事故検出及び地絡方向の情報をリセットする。これにより、事故区間に隣接しない保護継電器は次の事故に備えて自己回復が可能となる。 Further, the protective relays 8a to 8f are determined not to have an accident in the upstream adjacent section in the upstream accident determination section 87, or determined not to be in the downstream adjacent section in the downstream accident determination section 88. Then, it resets its own accident detection and ground fault direction information. As a result, the protective relay not adjacent to the accident section can be self-recovered in preparation for the next accident.

次に、動作について説明する。
配自サーバ１１及び各保護継電器８ａ〜８ｆの通信は、実施の形態１と同様に周波数管理テーブルを設けて区間毎に管理される。
例えば図１の区分開閉器６ｂと区分開閉器６ｃの間で地絡事故が発生すると、保護継電器８ａ〜８ｆは上流側及び下流側に隣接する保護継電器へ事故検出及び地絡方向の情報を送信する。しかし、保護継電器８ｅ、８ａは自己の地絡方向が下流側であるのに対し、受信した地絡方向も下流側を示すため、自身の隣接区間における事故ではないと判定して開閉制御信号を出力せず、常閉の遮断器３ｂ及び区分開閉器６ａの投入状態を維持する。同様に、保護継電器８d、８ｆは自己の地絡方向が上流側であるのに対し、受信した地絡方向も上流側を示すため、自身の隣接区間における事故ではないと判定して開閉制御信号を出力せず、区分開閉器６ｄの投入状態を維持すると共に、常開の連系開閉器７の開放状態を維持する。 Next, the operation will be described.
The communication between the allocation server 11 and each of the protection relays 8a to 8f is managed for each section by providing a frequency management table as in the first embodiment.
For example, when a ground fault occurs between the section switch 6b and the section switch 6c in FIG. 1, the protective relays 8a to 8f transmit the fault detection and ground fault direction information to the upstream and downstream adjacent protective relays. To do. However, while the protective relays 8e and 8a have their own ground fault direction downstream, the received ground fault direction also indicates the downstream side. No output is performed, and the normally closed circuit breaker 3b and the section switch 6a are kept on. Similarly, the protective relays 8d and 8f have their own ground fault direction upstream, whereas the received ground fault direction also indicates the upstream side. Is not output, and the closed state of the divisional switch 6d is maintained, and the open state of the normally open interconnection switch 7 is maintained.

これに対し、保護継電器８ｂは下流側に隣接する保護継電器８ｃとの間で周波数Ｆ５、Ｆ６を用いて検出情報を送受信し、自己の地絡方向と受信した地絡方向とが異なるので下流側の隣接区間における事故と判定して区分開閉器６ｂを開放すると共に、連系開閉器７に備えられた保護継電器８ｆへ周波数Ｆ１２を用いて投入信号を出力する。同様に、保護継電器８ｃは上流側に隣接する保護継電器８ｂとの間で検出情報を送受信して上流側の隣接区間における事故と判定し、区分開閉器６ｃを開放すると共に連系開閉器７の保護継電器８ｆへ投入信号を出力する。連系開閉器７の保護継電器８ｆは、保護継電器８ｂ、８ｃより投入信号を受信すると、自身は事故区間に隣接していないので開放状態を維持しているが、予め設定された投入時限だけ待って連系開閉器７を投入する。このように各保護継電器８ａ〜８ｆを動作させることにより、事故発生から事故区間より下流側の健全区間に給電するまでの総時間は０．４秒程度となり、瞬時停電よりも短い無停電状態で復旧できる。 On the other hand, the protection relay 8b transmits and receives detection information using the frequencies F5 and F6 to and from the protection relay 8c adjacent to the downstream side, and the ground fault direction is different from the received ground fault direction. Is determined to be an accident in the adjacent section, and the section switch 6b is opened, and a closing signal is output to the protective relay 8f provided in the interconnection switch 7 using the frequency F12. Similarly, the protective relay 8c transmits / receives detection information to / from the upstream adjacent protective relay 8b to determine an accident in the upstream adjacent section, opens the section switch 6c, and opens the connection switch 7 A closing signal is output to the protective relay 8f. When the protective relay 8f of the interconnection switch 7 receives the closing signal from the protective relays 8b and 8c, it keeps the open state because it is not adjacent to the accident section, but waits for the preset closing time. Then turn on the interconnection switch 7. By operating each of the protective relays 8a to 8f in this way, the total time from the occurrence of an accident to feeding the healthy section downstream from the accident section is about 0.4 seconds, and in an uninterruptible state shorter than an instantaneous power failure It can be recovered.

この実施の形態によれば、保護継電器８ａ〜８ｆは事故発生時に地絡事故とその地絡方向を検出し、自己の検出情報を隣接する保護継電器へ送信し、隣接する保護継電器の検出情報を受信し、自己の検出した地絡方向と受信した隣接する保護継電器の地絡方向とが異なると事故区間に隣接する保護継電器であると判定し、事故区間に隣接する遮断器３ｂ及び区分開閉器６ａ〜６ｄを開放すると共に連系開閉器７を投入することにより、事故区間より下流側の健全区間における復旧時間が事故の発生位置によって変動することが無く、信頼性の高い配電線の保護システムを得ることができる。 According to this embodiment, the protective relays 8a to 8f detect the ground fault and the direction of the ground fault when an accident occurs, transmit their own detection information to the adjacent protective relay, and detect the detection information of the adjacent protective relay. When the ground fault direction received by itself is different from the received ground fault direction of the adjacent protective relay, it is determined that the protective relay is adjacent to the accident section, and the circuit breaker 3b and the section switch adjacent to the accident section are determined. By opening the switches 6a to 6d and turning on the interconnection switch 7, the recovery time in the healthy section downstream from the accident section does not vary depending on the position of the accident, and the distribution line protection system is highly reliable. Can be obtained.

また、保護継電器８ａ〜８ｆは、自己の検出した地絡方向と受信した隣接する保護継電器の地絡方向とが同じ、あるいは隣接する保護継電器から検出情報を受信しない場合、事故区間に隣接する保護継電器であると判定せずに自己の検出結果をリセットすることにより、次の事故に備えて自己回復が可能となる。 In addition, the protection relays 8a to 8f have the same ground fault direction detected by themselves and the received ground fault direction of the adjacent protection relay, or when the detection information is not received from the adjacent protection relay, the protection relay adjacent to the accident section By resetting its own detection result without determining that it is a relay, self-recovery is possible in preparation for the next accident.

実施の形態３．
上記実施の形態１及び実施の形態２では、保護継電器８ａ〜８ｆは地絡事故が発生すると自身より下流側の事故であるか否かを検出して事故判定を行っている。実施の形態３では、上流側の地絡事故を検出する上流側地絡方向検出部８２ａと下流側の地絡事故を検出する下流側地絡方向検出部８２ｂを設け、地絡方向検出までの時間を短縮する。
保護継電器８ａ〜８ｆは、図８に示すように、地絡方向検出部８２の代わりに上流側の地絡事故を検出する上流側地絡方向検出部８２ａと下流側の地絡事故を検出する下流側地絡方向検出部８２ｂが設けられている。この上流側地絡方向検出部８２ａ及び下流側地絡方向検出部８２ｂは機能としては別のものであるが、同一の零相変流器及び零相変圧器を用いて零相電流と零相電圧のなす角から上流側と下流側のいずれの地絡事故であるか検出することもできる。
なお、実施の形態１の保護継電器８ａ〜８ｆにおいても、このように地絡方向検出部８２の代わりに上流側地絡方向検出部８２ａと下流側地絡方向検出部８２ｂを設けることは可能である。 Embodiment 3 FIG.
In the first embodiment and the second embodiment, when a ground fault occurs, the protective relays 8a to 8f detect whether or not the accident is on the downstream side of the protective relay 8a to 8f. In the third embodiment, an upstream ground fault direction detecting unit 82a that detects an upstream ground fault accident and a downstream ground fault direction detecting unit 82b that detects a downstream ground fault accident are provided, and until the ground fault direction is detected. Reduce time.
As shown in FIG. 8, the protective relays 8 a to 8 f detect an upstream ground fault direction detection unit 82 a that detects an upstream ground fault accident instead of the ground fault direction detection unit 82 and a downstream ground fault accident. A downstream-side ground fault direction detector 82b is provided. The upstream-side ground fault direction detection unit 82a and the downstream-side ground fault direction detection unit 82b have different functions, but the same zero-phase current transformer and zero-phase transformer are used. It is also possible to detect which of the ground faults on the upstream side or the downstream side from the angle formed by the voltage.
In the protective relays 8a to 8f of the first embodiment, it is possible to provide the upstream side ground fault direction detection unit 82a and the downstream side ground fault direction detection unit 82b instead of the ground fault direction detection unit 82 in this way. is there.

保護継電器８ａ〜８ｆは、事故検出部８１に入力された零相電流の大きさから地絡事故を検出すると、上流側の事故であれば上流側地絡方向検出部８２ａにより検出した情報を上流側の送信部８３を介して隣接する保護継電器へ事故検出の情報と共に送信する。同様に、下流側の事故であれば下流側地絡方向検出部８２ｂにより検出した情報を下流側の送信部８５を介して隣接する保護継電器へ事故検出の情報と共に送信する。このとき事故検出部８１は上流側の事故判定部８７及び下流側の事故判定部８８へ伝達を伝達し、上流側の地絡方向検出部８２ａは上流側の事故判定部８７へ、下流側の地絡方向検出部８２ｂは下流側の事故判定部８８へそれぞれ情報を伝達する。以降の動作については実施の形態２と同じため、説明を省略する。   When the protective relays 8a to 8f detect a ground fault from the magnitude of the zero-phase current input to the fault detector 81, the upstream side detects the information detected by the upstream ground fault direction detector 82a if it is an upstream fault. The information is transmitted together with the information of the accident detection to the adjacent protective relay via the transmission unit 83 on the side. Similarly, if it is a downstream accident, the information detected by the downstream ground fault direction detection unit 82b is transmitted to the adjacent protective relay via the downstream transmission unit 85 together with the accident detection information. At this time, the accident detection unit 81 transmits the transmission to the upstream accident determination unit 87 and the downstream accident determination unit 88, and the upstream ground fault direction detection unit 82a transmits to the upstream accident determination unit 87. The ground fault direction detection unit 82b transmits information to the accident determination unit 88 on the downstream side. Since subsequent operations are the same as those of the second embodiment, description thereof is omitted.

この実施の形態によれば、保護継電器８ａ〜８ｆは事故発生時に地絡事故とその地絡方向を検出し、自己の検出情報を隣接する保護継電器へ送信し、隣接する保護継電器の検出情報を受信し、自己の検出した地絡方向と受信した隣接する保護継電器の地絡方向とが異なると事故区間に隣接する保護継電器であると判定し、事故区間に隣接する遮断器３ｂ及び区分開閉器６ａ〜６ｄを開放すると共に、連系開閉器７を投入することにより、事故区間より下流側の健全区間における復旧時間が事故の発生位置によって変動することが無く、信頼性の高い配電線の保護システムを得ることができる。 According to this embodiment, the protective relays 8a to 8f detect the ground fault and the direction of the ground fault when an accident occurs, transmit their own detection information to the adjacent protective relay, and detect the detection information of the adjacent protective relay. When the ground fault direction received by itself is different from the received ground fault direction of the adjacent protective relay, it is determined that the protective relay is adjacent to the accident section, and the circuit breaker 3b and the section switch adjacent to the accident section are determined. By opening 6a to 6d and turning on the interconnection switch 7, the restoration time in the healthy section downstream from the accident section does not vary depending on the position of the accident, and the distribution line can be protected with high reliability. You can get a system.

また、保護継電器８ａ〜８ｆは上流側地絡方向検出部８２ａ及び下流側地絡方向検出部８２ｂを備えたことにより、上流側と下流側いずれの方向の地絡事故もほぼ同時に検出でき、事故区間を特定する時間を短縮できる。 Further, the protective relays 8a to 8f are provided with the upstream ground fault direction detection unit 82a and the downstream ground fault direction detection unit 82b, so that it is possible to detect ground faults in both the upstream side and the downstream side almost simultaneously. The time for identifying the section can be shortened.

また、保護継電器８ａ〜８ｆは、自己の検出した地絡方向と受信した隣接する保護継電器の地絡方向とが同じ、あるいは隣接する保護継電器から検出情報を受信しない場合、事故区間に隣接する保護継電器であると判定せずに自己の検出結果をリセットすることにより、次の事故に備えて自己回復が可能となる。 In addition, the protection relays 8a to 8f have the same ground fault direction detected by themselves and the received ground fault direction of the adjacent protection relay, or when the detection information is not received from the adjacent protection relay, the protection relay adjacent to the accident section By resetting its own detection result without determining that it is a relay, self-recovery is possible in preparation for the next accident.

１ 配電線の保護システム
２ 変圧器
３ａ、３ｂ 遮断器
４ 配電線
５ 母線
６ａ、６ｂ、６ｃ、６ｄ 区分開閉器
７ 連系開閉器
８ａ、８ｂ、８ｃ、８ｄ、８ｅ、８ｆ 保護継電器
９ 通信線
１０ 通信親局
１１ 配自サーバ
８１ 事故検出部
８２ 地絡方向検出部
８２ａ 上流側地絡方向検出部
８２ｂ 下流側地絡方向検出部
８３ 上流側の送信部
８４ 上流側の受信部
８５ 下流側の送信部
８６ 下流側の受信部
８７ 上流側の事故判定部
８８ 下流側の事故判定部
８９ 開閉制御部 DESCRIPTION OF SYMBOLS 1 Distribution line protection system 2 Transformer 3a, 3b Circuit breaker 4 Distribution line 5 Bus-line 6a, 6b, 6c, 6d Section switch 7 Linkage switch 8a, 8b, 8c, 8d, 8e, 8f Protection relay 9 Communication line 10 communication master station 11 own server 81 accident detection unit 82 ground fault direction detection unit 82a upstream side ground fault direction detection unit 82b downstream side ground fault direction detection unit 83 upstream transmission unit 84 upstream reception unit 85 downstream side Transmission unit 86 Downstream reception unit 87 Upstream accident determination unit 88 Downstream accident determination unit 89 Opening / closing control unit

Claims (5)

母線に遮断器を介して接続され、縦列配置された複数の区分開閉器を有する第１及び第２
の配電線と、前記第１及び第２の配電線の連系点に設けられた常開の連系開閉器とを有し、前記配電線の地絡事故発生時に前記遮断器又は前記区分開閉器を開放して事故区間を切り離し、健全区間に給電する配電線の保護システムにおいて、
前記遮断器、前記区分開閉器及び前記連系開閉器毎に設けられ、前記配電線上の地絡事故及びその地絡方向を検出する検出手段を有する保護継電器を備え、
前記保護継電器は、自己の検出手段による情報を地絡方向側に隣接する保護継電器へ送信する送信手段と、前記隣接する保護継電器の検出手段による情報を受信する受信手段と、前記送信手段により情報を送信した側に隣接する保護継電器から、前記母線に接続される前記遮断器が開放されるまでの所定時間内に、前記受信手段により情報を受信すると事故区間に隣接する保護継電器であると判定し、当該情報を受信しなければ事故区間に隣接しないと判定する事故判定手段と、前記事故判定手段の判定結果に基づいて前記遮断器、前記区分開閉器及び前記連系開閉器を制御する制御手段とを有し、
前記地絡事故発生時に前記事故判定手段が事故区間に隣接する保護継電器であると判定すると、事故区間に隣接する前記遮断器及び前記区分開閉器を、前記母線に接続される前記遮断器が開放されるまでに開放し、前記地絡事故の上流及び下流のそれぞれに設けられた前記地絡事故に隣接しない前記遮断器及び前記区分開閉器を投入状態に維持すると共に、前記事故判定手段が事故区間に隣接する保護継電器であると判定した前記保護継電器が、前記送信手段が送信する前記情報とは別に前記連系開閉器に備えられた保護継電器に対して投入信号を送信することで、前記連系開閉器を前記母線に接続される前記遮断器が開放されるまでに投入することを特徴とする配電線の保護システム。 First and second having a plurality of section switches connected to a bus bar through a circuit breaker and arranged in tandem
Distribution line and a normally open interconnection switch provided at the interconnection point of the first and second distribution lines, and when the ground fault occurs in the distribution line, the circuit breaker or the divisional switch In the protection system for the distribution line that opens the device, separates the accident section, and supplies power to the healthy section,
Provided for each of the circuit breaker, the divisional switch and the interconnection switch, comprising a protective relay having a detection means for detecting a ground fault on the distribution line and its ground fault direction,
The protection relay includes transmission means for transmitting information by its own detection means to a protection relay adjacent to the ground fault direction side, reception means for receiving information by the detection means of the adjacent protection relay, and information by the transmission means. When the information is received by the receiving means within a predetermined time until the breaker connected to the bus is opened from the protective relay adjacent to the side transmitting the signal, it is determined that the protective relay is adjacent to the accident section and a fault determining means determines that is not adjacent to the fault section not receive the information, the circuit breaker based on a determination result of the accident determining means, said section switches and controls for controlling the interconnection switch Means,
When the accident determination means determines that the protective relay is adjacent to the accident section when the ground fault occurs, the circuit breaker connected to the bus is opened, and the circuit breaker adjacent to the accident section is opened. The circuit breaker and the section switch that are not adjacent to the ground fault accident provided upstream and downstream of the ground fault accident are maintained in the input state, and the accident determination means The protection relay determined to be a protection relay adjacent to a section transmits a closing signal to the protection relay provided in the interconnection switch separately from the information transmitted by the transmission unit, A distribution line protection system, wherein a connection switch is inserted before the circuit breaker connected to the bus is opened . 前記事故判定手段は、前記検出手段により検出した自己の地絡方向と前記受信手段により
受信した隣接する保護継電器の地絡方向とが異なる場合に事故区間に隣接する保護継電器
であると判定することを特徴とする請求項１に記載の配電線の保護システム。 The accident determination means determines that it is a protective relay adjacent to the accident section when the ground fault direction detected by the detection means is different from the ground fault direction of the adjacent protective relay received by the reception means. The distribution line protection system according to claim 1. 前記検出手段は、上流側の地絡事故を検出する上流側地絡方向検出手段と下流側の地絡事The detecting means includes an upstream ground fault direction detecting means for detecting an upstream ground fault accident and a downstream ground fault.
故を検出する下流側地絡方向検出手段を備えたことを特徴とする請求項１または請求項２3. A downstream ground fault direction detecting means for detecting a fault is provided.
に記載の配電線の保護システム。Distribution line protection system described in 1. 母線に遮断器を介して接続され、縦列配置された複数の区分開閉器を有する第１及び第２First and second having a plurality of section switches connected to a bus bar through a circuit breaker and arranged in tandem
の配電線と、前記第１及び第２の配電線の連系点に設けられた常開の連系開閉器とを有し、前記配電線の地絡事故発生時に前記遮断器又は前記区分開閉器を開放して事故区間を切り離し、健全区間に給電する配電線の保護システムに用いられる保護継電器であって、前記遮断器又は前記区分開閉器を制御対象とし、それら制御対象毎に設けられる保護継電器であって、Distribution line and a normally open interconnection switch provided at the interconnection point of the first and second distribution lines, and when the ground fault occurs in the distribution line, the circuit breaker or the divisional switch A protective relay used in a distribution line protection system that opens a breaker to isolate an accident section and feeds power to a healthy section, with the breaker or the section switch as a control target, and protection provided for each control target A relay,
前記配電線上の地絡事故及びその地絡方向を検出する検出手段と、Detecting means for detecting a ground fault on the distribution line and a ground fault direction;
自己の検出手段による情報を地絡方向側に隣接する保護継電器へ送信する送信手段と、Transmitting means for transmitting information by its own detecting means to a protective relay adjacent to the ground fault direction side;
前記隣接する保護継電器の検出手段による情報を、前記隣接する保護継電器から受信する受信手段と、Receiving means for receiving information from detection means of the adjacent protection relay from the adjacent protection relay;
前記送信手段により情報を送信した側に隣接する保護継電器から、前記母線に接続される前記遮断器が開放されるまでの所定時間内に前記受信手段により情報を受信すると、自己を事故区間に隣接する保護継電器であると判定し、当該情報を受信しなければ事故区間に隣接しないと判定する事故判定手段と、When information is received by the receiving means within a predetermined time from the protective relay adjacent to the side where the information is transmitted by the transmitting means until the circuit breaker connected to the bus is opened, the self is adjacent to the accident section. Accident determination means that determines that it is a protective relay that does not adjoin the accident section unless the information is received;
前記事故判定手段が自己を事故区間に隣接する保護継電器であると判定した場合に、自己の前記制御対象を、前記母線に接続される前記遮断器が開放されるまでに開放し、事故区間に隣接しないと判定した場合に、自己の前記制御対象を投入状態に維持すると共に、前記送信手段が送信する前記情報とは別に前記連系開閉器に対して投入信号を送信する制御手段とを有することを特徴とする保護継電器。When the accident determination means determines that it is a protective relay adjacent to the accident section, it opens the control object of itself until the circuit breaker connected to the bus is opened, and enters the accident section. Control means for transmitting a closing signal to the interconnection switch separately from the information transmitted by the transmitting means, while maintaining the control target of the self in a closing state when it is determined that they are not adjacent. A protective relay characterized by that. 請求項４に記載の前記連系開閉器に対して設けられる保護継電器であって、前記遮断器又は前記区分開閉器を制御対象とする前記保護継電器が送信する前記投入信号を受信することで、前記連系開閉器を前記母線に接続される前記遮断器が開放されるまでに投入するとともに、前記遮断器又は前記区分開閉器を制御対象とする前記保護継電器が送信する前記情報が受信された場合は前記連系開閉器を投入せずに開放状態に維持することを特徴とする保護継電器。A protective relay provided for the interconnection switch according to claim 4, by receiving the closing signal transmitted by the protective relay to be controlled by the breaker or the section switch, The interconnection switch is turned on before the circuit breaker connected to the bus is opened, and the information transmitted by the protective relay whose control target is the circuit breaker or the section switch is received. In this case, the protective relay is maintained without opening the interconnection switch.
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