JP3878359B2 - System stabilization device - Google Patents

Description

【０００８】
従って、事故判定部４０は、表１に基づいて各事故様相に応じた１相事故の起動信号４０Ａ、２相事故の起動信号４０Ｂ、同名相・３相事故の起動信号４０Ｃ、欠相事故の起動信号４０Ｄ、ルート断事故の起動信号４０Ｅのいずれか一つを出力する。そして、これら事故判定部４０からの起動信号４０Ａ〜４０Ｅ及び母線事故条件部３０からの起動信号３３Ａ・３３Ｂの種別に応じて、系統安定化対策が施される。
【０００９】
【発明が解決しようとする課題】
従来の系統安定化装置では、母線事故条件を母線保護リレーの動作条件のみで事故の判断を行っているため、送電線の回線停止時、母線停止時、また母線の運用状況によっては事故を正しく判定することができず、適切な制御が実施できないこと、また回線停止中の母線事故によるルート断事故と送電線事故によるルート断事故を正しく判定することができないため適切な制御ができないこと、また母線事故と送電線事故が同時期に発生した場合に、母線事故のみの制御としたいにも拘わらず送電線事故の制御も行われ、過剰な制御を実施してしまうこと、また母線事故にも拘わらず母線保護リレーの動作による遮断器「開」条件を送電線事故と誤って判断し、送電線事故の制御が過剰に行われてしまうこと、などの問題点を有していた。
【００１０】
このような従来の系統安定化装置が有していた問題点に鑑み、本発明は、送電線、母線の事故状況、運用状況を総合的に判定し、適切な制御を行える系統安定化装置を提供することを目的とする。
【００１１】
【課題を解決するための手段】
請求項１の系統安定化装置は、一つの送電線に２つの母線が接続され、前記送電線と前記母線とは一つの遮断器と各母線に対して一つの断路器を介して接続され、前記送電線に事故が発生したことを検出し当該送電線に接続された前記遮断器に開放指令を出力する送電線保護リレーと母線に事故が発生したことを検出し、事故の発生した母線に接続されている遮断器に開放指令を出力する母線保護リレーとの動作に基づき事故の発生を検出し、適切な事故判定を行う系統安定化装置において、前記送電線保護リレーの動作条件、前記母線保護リレーの動作条件、遮断器状態、前記送電線が接続されている母線を判断する断路器状態を入力する情報入力部と、この情報入力部から入力される送電線保護リレーの動作あるいは遮断器が「開」となった送電線を事故と判定する送電線事故条件部と、前記情報入力部からの遮断器状態及び断路器状態より、前記母線と前記送電線との接続の有無を判断し、前記母線保護リレーが動作した場合その母線に接続されている送電線を事故と判定する第１送電線母線事故条件部及び第２送電線母線事故条件部と、前記送電線事故条件部の出力から送電線の事故様相を判断し、事故様相に対応した信号を出力する総合事故判定部を備える共に、前記第１送電線母線事故条件部及び第２送電線母線事故条件部から共に事故条件が出力されたときに送電線のルート断の信号を他の信号に優先して出力することを特徴とする。
【００１２】
この構成によれば、第１送電線母線事故条件部から入力される送電線母線事故信号と第２送電線母線事故条件部から入力される送電線母線事故信号とが共に“１”となったことで、事故判定部からのルート断事故の起動信号を出力させる。すなわち、母線事故により送電線がルート断となる場合には、総合事故判定部の事故様相の判断として、送電線ルート断を優先している。これにより、２母線運用中の母線事故で送電線がルート断となる場合に、正しくルート断と判断することが可能となる。
【００１３】
請求項２の系統安定化装置は、請求項１記載の系統安定化装置において、前記総合事故判定部の事故様相の判断に、送電線事故条件と第１送電線母線事故条件あるいは第２送電線母線事故条件が同時に成立する場合は、第１送電線母線事故条件あるいは第２送電線母線事故条件を優先する機能を付加することを特徴とする。
【００１４】
この構成によれば、第１送電線母線事故条件部から入力される送電線母線事故信号と第２送電線母線事故条件部から入力される送電線母線事故信号のいずれかが与えられることで、１母線事故と判断し、１母線事故の起動信号を出力する。そして、第１送電線母線事故条件部から入力される送電線母線事故信号と第２送電線母線事故条件部から入力される送電線母線事故信号との少なくともいずれかが与えられたことを事故判定部に入力する。従って、総合事故判定部の事故様相の判断において、送電線事故条件と送電線母線事故条件が同時に成立する場合には、送電線母線事故条件による判断を優先させ、母線保護リレーと送電線保護リレーとが同時に動作する場合であっても母線事故と判断することが可能となる。
【００２１】
【発明の実施の形態】
以下、本発明の実施例について、図を参照して説明する。
【００２２】
図１は本発明の第１の実施例を示す構成図である。同図において、本発明の系統安定化装置は、情報入力部１０と、第１送電線事故条件部２０と、第２送電線事故条件部２５と、第１送電線母線事故条件部５０と、第２送電線母線事故条件部６０と、総合事故判定部７０から構成されている。
【００２３】
情報入力部１０は、送電線１Ｌの送電線保護リレーの動作条件１２Ａ，１２Ｂ，１２Ｃと、送電線２Ｌの送電線保護リレーの動作条件１５Ａ，１５Ｂ，１５Ｃと、甲母線側の母線保護リレーの動作条件１３Ａと乙母線側の母線保護リレーの動作条件１３Ｂと、送電線１Ｌの遮断器「開」の状態１１Ａ，１１Ｂ，１１Ｃと、送電線２Ｌの遮断器「開」の状態１４Ａ，１４Ｂ，１４Ｃと、送電線１Ｌの甲母線側断路器「開」の状態１６Ａと乙母線側断路器「開」の状態１６Ｂと、送電線２Ｌの甲母線側断路器「開」の状態１７Ａと乙母線側断路器「開」の状態１７Ｂを取り込んで、これらの条件・状態を出力する。
【００２４】
第１送電線事故条件部２０は、オア回路２０Ａ，２０Ｂ，２０Ｃで送電線１Ｌの送電線保護リレーの動作条件１２Ａ，１２Ｂ，１２Ｃが“１”、または送電線１Ｌの遮断器状態１１Ａ，１１Ｂ，１１Ｃが“１”の場合に送電線事故信号２１Ａ，２１Ｂ，２１Ｃを出力する。
【００２５】
第２送電線事故条件部２５は、オア回路２５Ａ，２５Ｂ，２５Ｃで送電線２Ｌの送電線保護リレーの動作条件１５Ａ，１５Ｂ，１５Ｃが“１”、または送電線２Ｌの遮断器状態１４Ａ，１４Ｂ，１４Ｃが“１”の場合に送電線事故信号２６Ａ，２６Ｂ，２６Ｃを出力する。
【００２６】
第１送電線母線事故条件部５０は、送電線１Ｌの遮断器状態１１Ａ，１１Ｂ，１１Ｃが３相全て「開」であることをアンド回路５０Ａで判定し、ノット回路５１Ａ，５１Ｃで送電線１Ｌが停止していないと判断し、甲母線側の断路器「開」の状態１６Ａのノット回路５１Ｂの出力とのアンド回路５２Ａで送電線１Ｌが甲母線側に接続されていることを判断する。同様に乙母線側の断路器「開」の状態１６Ｂのノット回路５１Ｄの出力とのアンド回路５２Ｂで送電線１Ｌが乙母線側に接続されていることを判断する。そして、アンド回路５３Ａで送電線１Ｌが甲母線側に接続されている時に甲母線側の母線保護リレーの動作条件１３Ａが入力された場合、またはアンド回路５３Ｂで送電線１Ｌが乙母線側に接続されている時に乙母線側の母線保護リレーの動作条件１３Ｂが入力された場合に送電線１Ｌを事故と判断し、オア回路５４を通して送電線母線事故信号５５を出力する。この送電線母線事故信号５５は、母線事故に対しては３相一括遮断とするため、３相事故として出力される。
【００２７】
第２送電線母線事故条件部６０は、送電線２Ｌの遮断器状態１４Ａ，１４Ｂ，１４Ｃが３相全て「開」であることをアンド回路６０Ａで判定し、ノット回路６１Ａ，６１Ｃで送電線２Ｌが停止していないと判断し、甲母線側の断路器「開」の状態１７Ａのノット回路６１Ｂの出力とのアンド回路６２Ａで送電線２Ｌが甲母線側に接続されていることを判断する。同様に乙母線側の断路器「開」の状態１７Ｂのノット回路６１Ｄの出力とのアンド回路６２Ｂで送電線２Ｌが乙母線側に接続されていることを判断する。そして、アンド回路６３Ａで送電線２Ｌが甲母線側に接続されている時に甲母線側の母線保護リレーの動作条件１３Ａが入力された場合、またはアンド回路６３Ｂで送電線２Ｌが乙母線側に接続されている時に乙母線側の母線保護リレーの動作条件１３Ｂが入力された場合に送電線２Ｌを事故と判断し、オア回路６４を通して送電線母線事故信号６５を出力する。この送電線母線事故信号６５は、母線事故に対しては３相一括遮断とするため、３相事故として出力される。
【００２８】
総合事故判定部７０は、送電線１Ｌの送電線事故信号２１Ａ，２１Ｂ，２１Ｃと送電線母線事故信号５５から事故信号７３Ａ，７３Ｂ，７３Ｃをオア回路７０Ａ，７０Ｂ，７０Ｃを通して入力し、送電線２Ｌの送電線事故信号２６Ａ，２６Ｂ，２６Ｃと送電線母線事故信号６５から事故信号７４Ａ，７４Ｂ，７４Ｂをオア回路７１Ａ，７１Ｂ，７１Ｃを通して入力する。事故判定部７６では事故信号７３Ａ，７３Ｂ，７３Ｃ，７４Ａ，７４Ｂ，７４Ｃを入力信号とし、事故様相を前掲の表１に基づいて判断し、１相事故の起動信号７５Ａと２相事故の起動信号７５Ｂと同名相・３相事故の起動信号７５Ｃと欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。
【００２９】
このように、第１送電線母線事故条件部５０では、遮断器状態１１Ａ，１１Ｂ、１１Ｃ及び断路器状態１６Ａ，１６Ｂに基づいて、甲、乙母線と送電線１Ｌとの関係を特定し、母線保護リレーが動作（動作条件１３Ａ，１３Ｂ）した場合その母線に接続されている送電線を事故と判定する。そして、この第１送電線母線事故条件部５０からの送電線母線事故信号５５を、第１送電線事故条件部２０の送電線事故信号２１Ａ，２１Ｂ，２１Ｃと一緒に総合事故判定部７０に入力して、事故判定を行っている。
【００３０】
同様に、第２送電線母線事故条件部６０では、遮断器状態１４Ａ，１４Ｂ、１４Ｃ及び断路器状態１７Ａ，１７Ｂに基づいて、甲、乙母線と送電線２Ｌとの関係を特定し、母線保護リレーが動作（動作条件１３Ａ，１３Ｂ）した場合その母線に接続されている送電線を事故と判定する。そして、この第２送電線母線事故条件部６０からの送電線母線事故信号６５を、第２送電線事故条件部２５の送電線事故信号２６Ａ，２６Ｂ，２６Ｃと一緒に総合事故判定部７０に入力して、事故判定を行っている。
【００３１】
このような構成としているから、送電線の回線停止や母線停止が行われていても、また各母線の運用状態に制限されることなく、正しく事故の判定を行うことができる。
【００３２】
図２は本発明の第２の実施例を示す構成図である。同図において、本発明の系統安定化装置は、情報入力部１０と、第１送電線事故条件部２０と、第２送電線事故条件部２５と、第１送電線母線事故条件部５０と、第２送電線母線事故条件部６０と、第１送電線停止条件部８０と、第２送電線停止条件部９０と、総合事故判定部７０から構成されている。
【００３３】
この構成の内、第１送電線停止条件部８０と第２送電線停止条件部９０以外の、情報入力部１０、第１送電線事故条件部２０、第２送電線事故条件部２５、第１送電線母線事故条件部５０、第２送電線母線事故条件部６０、総合事故判定部７０は、図１におけると同様である。ただ、総合事故判定部７０に関しては、一部の入力条件が異なっているが、この点については後述する。
【００３４】
第１送電線停止条件部８０は、送電線１Ｌの遮断器状態１１Ａ，１１Ｂ，１１Ｃが３相全て「開」であることをアンド回路８０Ａで判定するか、または甲母線側の断路器状態１６Ａが「開」且つ乙母線側の断路器状態１６Ｂが「開」であることをアンド回路８０Ｂで判定する。そして、両アンド回路８０Ａ，８０Ｂの出力をオア回路８１を通してタイマー８２に印加し、タイマー８２の設定時間であるＴ時間後に送電線１Ｌが停止していると判断し、送電線１Ｌ停止信号８３を出力する。
【００３５】
また、第２送電線停止条件部９０は、送電線２Ｌの遮断器状態１４Ａ，１４Ｂ，１４Ｃが３相全て「開」であることをアンド回路９０Ａで判定するか、または甲母線側の断路器状態１７Ａが「開」且つ乙母線側の断路器状態１７Ｂが「開」であることをアンド回路９０Ｂで判定する。そして、両アンド回路９０Ａ，９０Ｂの出力をオア回路９１を通してタイマー９２に印加し、タイマー９２の設定時間であるＴ時間後に送電線２Ｌが停止していると判断し、送電線２Ｌ停止信号９３を出力する。
【００３６】
総合事故判定部７０は、送電線１Ｌの送電線事故信号２１Ａ，２１Ｂ，２１Ｃと送電線母線事故信号５５から事故信号７３Ａ，７３Ｂ，７３Ｃをオア回路７０Ａ，７０Ｂ，７０Ｃを通して事故判定部７６に入力し、また送電線２Ｌの送電線事故信号２６Ａ，２６Ｂ，２６Ｃと送電線母線事故信号６５から事故信号７４Ａ，７４Ｂ，７４Ｂをオア回路７１Ａ，７１Ｂ，７１Ｃを通して事故判定部７６に入力する。また、総合事故判定部７０は、新しい入力として、第１送電線停止条件部８０からの送電線１Ｌ停止信号８３及び第２送電線停止条件部９０からの送電線２Ｌ停止信号９３を事故判定部７６に入力する。
【００３７】
事故判定部７６では、送電線１Ｌ停止信号８３と送電線２Ｌ停止信号９３が“０”であれば事故信号７３Ａ，７３Ｂ，７３Ｃ，７４Ａ，７４Ｂ，７４Ｃを入力信号とし、事故様相を表１に基づいて判断し、１相事故の起動信号７５Ａと２相事故の起動信号７５Ｂと同名相・３相事故の起動信号７５Ｃと欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。
【００３８】
しかし、送電線１Ｌ停止信号８３が“１”であれば、送電線２Ｌの事故信号７４Ａ，７４Ｂ，７４Ｃを入力信号として、事故様相を表２に基づいて判断する。
【００３９】
【表２】

【００４０】
この表２は、送電線１Ｌ停止信号８３が“１”の場合に送電線２Ｌの事故信号７４Ａ，７４Ｂ，７４Ｃを入力信号として、また送電線２Ｌ停止信号９３が“１”の場合に送電線１Ｌの事故信号７３Ａ，７３Ｂ，７３Ｃを入力信号として、事故様相を判断するものである。表２で、例示する事故信号パターンは、各事故様相に対応して、上側が事故信号７３Ａ，７３Ｂ，７３Ｃを、下側が送電線２Ｌ停止を表しており、黒丸が事故信号ありの“１”、白丸が事故信号なしの“０”を表している。
【００４１】
従って、事故判定部７６は、表２に基づいて各事故様相に応じた欠相事故の起動信号４０Ｄ、ルート断事故の起動信号４０Ｅのいずれか一つを出力する。そして、これら事故判定部７６からの起動信号４０Ｄ・４０Ｅの種別に応じて、系統安定化対策が施される。
【００４２】
また、送電線２Ｌ停止信号９３が“１”であれば送電線１Ｌの事故信号７３Ａ，７３Ｂ，７３Ｃを入力信号として、事故様相を表２に基づいて判断し、欠相事故の起動信号（７５Ｄ）とルート断事故の起動信号（７５Ｅ）のいずれか一つを出力する。
【００４３】
このように、第１送電線停止条件部８０では、遮断器状態１１Ａ，１１Ｂ、１１Ｃ及び断路器状態１６Ａ，１６Ｂに基づいて、送電線１Ｌ停止信号８３を事故判定部７６に与え、また第２送電線停止条件部８９では、遮断器状態１４Ａ，１４Ｂ、１４Ｃ及び断路器状態１７Ａ，１７Ｂに基づいて、送電線２Ｌ停止信号９３を事故判定部７６に与える。事故判定部７６では、送電線１Ｌ停止信号８３あるいは送電線２Ｌ停止信号９３により、事故様相の判断を表１から表２に切り換えて判断しているから、送電線停止中の母線事故でルート断となっても母線事故と判断することができ、適切な系統安定化制御を行うことができる。
【００４４】
図３は本発明の第３の実施例を示す構成図である。同図において、本発明の系統安定化装置は、情報入力部１０と、第１送電線事故条件部２０と、第２送電線事故条件部２５と、第１送電線母線事故条件部５０と、第２送電線母線事故条件部６０と、総合事故判定部７０から構成されている。
【００４５】
この構成の内、情報入力部１０、第１送電線事故条件部２０、第２送電線事故条件部２５、第１送電線母線事故条件部５０、第２送電線母線事故条件部６０は、図１におけると同様であり、ただ、総合事故判定部７０に関して、一部異なっている。
【００４６】
総合事故判定部７０において、第１送電線母線事故条件部５０から入力される送電線母線事故信号５５と第２送電線母線事故条件部６０から入力される送電線母線事故信号６５とをアンド回路７７Ａに印加して、送電線がルート断となるか否か判断する。
【００４７】
そして、送電線がルート断の場合（アンド回路７７Ａの出力が“１”）はオア回路７７Ｃを通してルート断事故の起動信号７５Ｅを出力すると共に、ノット回路７７Ｂを介して事故判定部７６にその信号を印加する。
【００４８】
一方、ルート断事故にならないと判断した場合（アンド回路７７Ａの出力が“０”）は送電線事故信号２１Ａ，２１Ｂ，２１Ｃ，２６Ａ，２６Ｂ，２６Ｃを事故判定部７６の入力信号とし、事故様相を表１に基づいて判断し、１相事故の起動信号７５Ａと２相事故の起動信号７５Ｂと同名相・３相事故の起動信号７５Ｃと欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。
【００４９】
この構成によれば、第１送電線母線事故条件部から入力される送電線母線事故信号と第２送電線母線事故条件部から入力される送電線母線事故信号とが共に“１”となったことで、事故判定部７６からのルート断事故の起動信号７５Ｅを出力させる。すなわち、母線事故により送電線がルート断となる場合には、総合事故判定部の事故様相の判断として、送電線ルート断を優先している。これにより、２母線運用中の母線事故で送電線がルート断となる場合に、正しくルート断と判断することが可能となる。
【００５０】
図４は本発明の第４の実施例を示す構成図である。同図において、本発明の系統安定化装置は、情報入力部１０と、第１送電線事故条件部２０と、第２送電線事故条件部２５と、第１送電線母線事故条件部５０と、第２送電線母線事故条件部６０と、総合事故判定部７０から構成されている。
【００５１】
この構成の内、情報入力部１０、第１送電線事故条件部２０、第２送電線事故条件部２５、第１送電線母線事故条件部５０、第２送電線母線事故条件部６０は、図１におけると同様であり、ただ、総合事故判定部７０に関して、一部異なっている。
【００５２】
総合事故判定部７０において、図３におけると同様に、第１送電線母線事故条件部５０から入力される送電線母線事故信号５５と第２送電線母線事故条件部６０から入力される送電線母線事故信号６５とをアンド回路７７Ａに印加して、送電線がルート断となるか否か判断する。
【００５３】
そして、送電線がルート断の場合（アンド回路７７Ａの出力が“１”）はオア回路７７Ｃを通してルート断事故の起動信号７５Ｅを出力する。
【００５４】
さらに、第１送電線母線事故条件部５０の送電線母線事故信号５５と第２送電線母線事故条件部６０の送電線母線事故信号６５を受けて、アンド回路７８Ｃとノット回路７８Ｄ又はアンド回路７８Ｅとノット回路７８Ｆにより、甲、乙母線のいずれかの母線事故の場合に１母線事故と判断し、オア回路７８Ｇを通して１母線事故の起動信号７５Ｇを出力する。またこの時、第１送電線母線事故条件部５０の送電線母線事故信号５５と第２送電線母線事故条件部６０の送電線母線事故信号６５をオア回路７８Ａ、ノット回路７８Ｂを介して事故判定部７６に与えて、母線事故であることを入力する。
【００５５】
一方、第１送電線母線事故条件部５０の送電線母線事故信号５５と第２送電線母線事故条件部６０の送電線母線事故信号６５のいずれも発生されていない場合には、送電線事故信号２１Ａ，２１Ｂ，２１Ｃ，２６Ａ，２６Ｂ，２６Ｃを事故判定部７６の入力信号とし、事故様相を表１に基づいて判断し、１相事故の起動信号７５Ａと２相事故の起動信号７５Ｂと同名相・３相事故の起動信号７５Ｃと欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。
【００５６】
このように、総合事故判定部７０において、第１送電線母線事故条件部５０から入力される送電線母線事故信号５５と第２送電線母線事故条件部６０から入力される送電線母線事故信号６５とが共に与えられることで、送電線がルート断の状態であると判断し、ルート断事故の起動信号７５Ｅを出力する。また、第１送電線母線事故条件部５０から入力される送電線母線事故信号５５と第２送電線母線事故条件部６０から入力される送電線母線事故信号６５のいずれかが与えられることで、１母線事故と判断し、１母線事故の起動信号７５Ｇを出力する。そして、第１送電線母線事故条件部５０から入力される送電線母線事故信号５５と第２送電線母線事故条件部６０から入力される送電線母線事故信号６５との少なくともいずれかが与えられたことを事故判定部７６に入力する。従って、総合事故判定部７０の事故様相の判断において、送電線事故条件と送電線母線事故条件が同時に成立する場合には、送電線母線事故条件による判断を優先させ、母線保護リレーと送電線保護リレーとが同時に動作する場合であっても母線事故と判断することが可能となる。
【００５７】
図５は本発明の第５の実施例を示す構成図である。同図において、本発明の系統安定化装置は、情報入力部１０と、第１送電線事故条件部２０と、第２送電線事故条件部２５と、第１送電線母線事故条件部５０と、第２送電線母線事故条件部６０と、第１送電線停止条件部８０と、第２送電線停止条件部９０と、総合事故判定部７０から構成されている。
【００５８】
この構成の内、情報入力部１０、第１送電線事故条件部２０、第２送電線事故条件部２５、第１送電線母線事故条件部５０、第２送電線母線事故条件部６０、第１送電線停止条件部８０と第２送電線停止条件部９０は、図２におけると同様である。ただ、総合事故判定部７０に関しては、一部の入力条件が異なっている。
【００５９】
総合事故判定部７０において、オア回路７２Ａで第１送電線母線事故判断部５０から入力される送電線母線事故信号５５を入力してからタイマー７２Ｂの設定時間Ｔ後または送電線停止信号８３が入力された場合を送電線１Ｌの停止と判断する。また、オア回路７２Ｃで第２送電線母線事故判断部６０から入力される送電線母線事故信号６５を入力してからタイマー７２Ｄの設定時間Ｔ後、または送電線停止信号９３が入力された場合を送電線２Ｌの停止と判断する。
【００６０】
事故判定部７６では送電線１Ｌと送電線２Ｌがいずれも停止でなければ事故様相を表１に基づいて判断し、１相事故の起動信号７５Ａと２相事故の起動信号７５Ｂと同名相・３相事故の起動信号７５Ｃと欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。また、送電線１Ｌが停止であれば送電線２Ｌの事故信号７４Ａ，７４Ｂ，７４Ｃを入力信号とし、事故様相を表２に基づいて判断し、欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力し、送電線２Ｌが停止であれば送電線１Ｌの事故信号７３Ａ，７３Ｂ，７３Ｃを入力信号とし、事故様相を表２に基づいて判断し、欠相事故の起動信号７５Ｄとルート断事故の起動信号７５Ｅのいずれか一つを出力する。
【００６１】
このように、事故判定部７６では、送電線１Ｌ停止信号８３あるいは送電線２Ｌ停止信号９３に加えて、第１送電線母線事故条件部５０の送電線母線事故信号５５と第２送電線母線事故条件部６０の送電線母線事故信号６５からそれぞれタイマー７２Ｂ，７２Ｄを介して停止信号と同様に入力していることにより、事故様相の判断を表１から表２に切り換えて判断しているから、第１送電線母線事故条件部５０、第１送電線母線事故条件部６０の出力から、送電線の停止を判断し、総合事故判定部の事故様相の判断を切り換えることができ、母線保護リレーの動作による遮断器「開」条件で送電線事故と誤って判断することがなくなり、適切な系統安定化制御を行うことができる。
【００６２】
【発明の効果】
請求項１記載の発明によれば、送電線事故条件と送電線母線事故条件の出力から事故を総合事故判定部で判断することにより、送電線の回線停止や母線停止、母線の運用状態に制限されることなく適切な制御ができる。
【００６３】
請求項２記載の発明によれば、総合事故判定部の判断を送電線の停止条件で切替えることにより、送電線停止中の母線事故でルート断となっても母線事故と判断するため適切な制御ができる。
【００６４】
請求項３記載の発明によれば、２母線運用中の母線事故時に送電線がルート断となる場合はルート断を優先させることにより、過剰な制御を実施することがなくなる。
【００６５】
請求項４記載の発明によれば、片回線運用中の遮断器内部事故などで母線保護リレーと送電線保護リレーが同時に動作する場合には、母線保護リレー動作による判断を優先させることにより過剰な制御を実施することがなくなる。
【００６６】
請求項５記載の発明によれば、母線保護リレーの動作後すぐに送電線の回線停止と判断することにより、母線保護リレー動作による遮断器「開」条件で送電線事故と誤って判断することがなくなり、過剰な制御を実施することがなくなる。
【図面の簡単な説明】
【図１】本発明の第１の実施例に係る系統安定化装置の構成図。
【図２】本発明の第２の実施例に係る系統安定化装置の構成図。
【図３】本発明の第３の実施例に係る系統安定化装置の構成図。
【図４】本発明の第４の実施例に係る系統安定化装置の構成図。
【図５】本発明の第５の実施例に係る系統安定化装置の構成図。
【図６】従来の系統安定化装置の構成図。
【符号の説明】
１０ 情報入力部
２０ 第１送電線事故条件部
２５ 第２送電線事故条件部
５０ 第１送電線母線事故条件部
６０ 第２送電線母線事故条件部
７０ 総合事故判定部
８０ 第１送電線停止条件部
９０ 第２送電線停止条件部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system stabilizing device for protecting a power system.
[0002]
[Prior art]
A conventional system stabilizing device will be described with reference to FIG. In FIG. 6, the information input unit 10 includes operating conditions 12A, 12B, and 12C for power transmission line protection relays on the power transmission line 1L, operating conditions 15A, 15B, and 15C for power transmission line protection relays on the power transmission line 2L, and bus protection on the bus side. Relay operating condition 13A, B bus-side bus protection relay operating condition 13B, transmission line 1L circuit breaker "open" state 11A, 11B, 11C and transmission line 2L circuit breaker "open" state 14A, 14B , 14C.
[0003]
In the first transmission line accident condition unit 20, the operating conditions 12A, 12B, and 12C of the transmission line protection relay of the transmission line 1L are “1” in the OR circuits 20A, 20B, and 20C, or the circuit breaker “open” state of the transmission line 1L When 11A, 11B, and 11C are “1”, accident signals 21A, 21B, and 21C are output. In the second transmission line accident condition unit 25, the operating conditions 15A, 15B, 15C of the transmission line protection relay of the transmission line 2L are “1” in the OR circuits 25A, 25B, 25C, or the circuit breaker “open” state of the transmission line 2L When 14A, 14B, and 14C are “1”, accident signals 26A, 26B, and 26C are output.
[0004]
The bus accident condition section 30 is based on the operation condition 13A of the bus protection relay on the side of the bus A and the operation condition 13B of the bus protection relay on the side of the O bus, and the accident occurs only on the side of the bus A due to the AND circuit 31A and the knot circuit 30A. If the circuit 30B determines that the fault occurs only on the second bus side, the start signal 33A for the first bus fault is output, and the AND circuit 31C operates the operation condition 13A for the bus protection relay on the first bus side and the operation condition for the bus protection relay on the second bus side. If both 13B determine that there is an accident, a two-bus accident start signal 33B is output.
[0005]
The accident determination unit 40 uses the accident signals 21A, 21B, and 21C input from the first power transmission line accident condition unit 20 and the accident signals 26A, 26B, and 26C input from the second power transmission line accident condition 25 as input signals. The accident aspect is judged, and the start signal of each accident according to each accident aspect is output.
[0006]
The relationship between the accident signals 21A, 21B, 21C, 26A, 26B, and 26C and the start signal is exemplified in Table 1. In Table 1, the accident signal pattern corresponds to each accident aspect, the upper side represents the accident signals 21A, 21B, and 21C, the lower side represents the accident signals 26A, 26B, and 26C, and the black circle represents “1” with the accident signal. ", A white circle represents" 0 "without an accident signal.
[0007]
[Table 1]

[0008]
Therefore, the accident determination unit 40, based on Table 1, the one-phase accident start signal 40A corresponding to each accident aspect, the two-phase accident start signal 40B, the same-phase / three-phase accident start signal 40C, the open-phase accident One of the start signal 40D and the route break accident start signal 40E is output. Then, system stabilization measures are taken according to the types of activation signals 40A to 40E from the accident determination unit 40 and activation signals 33A and 33B from the bus accident condition unit 30.
[0009]
[Problems to be solved by the invention]
In the conventional system stabilizer, the fault is determined based on the bus fault condition only when the bus protection relay is operating, so the fault may not be correct depending on whether the transmission line is stopped, the bus is stopped, or the bus is operating. Inability to determine the appropriate control, the failure of the route due to a bus failure while the line is stopped, and the failure of the route due to a transmission line failure cannot be determined correctly, and appropriate control cannot be performed. If a bus accident and a power line accident occur at the same time, the control of the power line accident is also performed despite the desire to control only the bus accident. Regardless, the circuit breaker “open” condition due to the operation of the busbar protection relay is erroneously determined as a power line accident, resulting in excessive control of the power line accident.
[0010]
In view of the problems of such a conventional system stabilizing device, the present invention provides a system stabilizing device capable of comprehensively determining the accident status and operation status of power transmission lines and buses and performing appropriate control. The purpose is to provide.
[0011]
[Means for Solving the Problems]
  The system stabilizing device according to claim 1 comprises:Two power buses are connected to one power transmission line, the power transmission line and the bus are connected to one circuit breaker and one bus disconnector via one disconnector, and an accident has occurred in the power transmission line. Detects that an accident has occurred in the power line protection relay and bus that detects and outputs an open command to the circuit breaker connected to the power transmission line, and issues an open command to the circuit breaker connected to the bus where the accident occurred In the system stabilization device that detects the occurrence of an accident based on the operation with the bus protection relay to output and performs an appropriate accident determination, the operating condition of the power line protection relay, the operating condition of the bus protection relay, the circuit breaker state, An information input unit for inputting a disconnector state for determining a bus to which the power transmission line is connected, and a power transmission line in which the operation of the power line protection relay input from the information input unit or the circuit breaker is “open” Sending an accident From the line fault condition part and the circuit breaker state and the disconnector state from the information input part, it is determined whether or not the bus line and the power transmission line are connected, and when the bus protection relay operates, the bus line is connected to the bus line. The first transmission line bus accident condition part and the second transmission line bus accident condition part for judging the existing transmission line as an accident, and the accident aspect of the transmission line are judged from the output of the transmission line accident condition part and corresponding to the accident aspect A comprehensive accident determination unit that outputs a signal, and when an accident condition is output from both the first transmission line bus fault condition unit and the second transmission line bus fault condition unit, The signal is output with priority over the signal.
[0012]
  According to this configuration, both the transmission line bus fault signal input from the first transmission line bus fault condition section and the transmission line bus fault signal input from the second transmission line bus fault condition section are "1". Thus, the start signal of the route break accident from the accident determination unit is output. That is, when a transmission line is disconnected due to a bus accident, priority is given to the transmission line route disconnection as a determination of the accident aspect of the general accident determination unit. As a result, when the transmission line is disconnected due to a bus accident during the operation of the two-bus, it is possible to correctly determine that the route is disconnected.
[0013]
  The system stabilization device according to claim 2 is the system stabilization device according to claim 1, wherein the comprehensive accident determination unit determines whether or not the accident aspect is a transmission line accident condition and a first transmission line bus accident condition or a second transmission line. When the bus accident condition is satisfied at the same time, a function of giving priority to the first transmission line bus accident condition or the second transmission line bus accident condition is added.
[0014]
  According to this configuration, either the transmission line bus accident signal input from the first transmission line bus accident condition part or the transmission line bus accident signal input from the second transmission line bus accident condition part is given, It judges that it is a 1 bus accident and outputs the start signal of 1 bus accident. An accident determination is made that at least one of the transmission line bus fault signal input from the first transmission line bus fault condition section and the transmission line bus fault signal input from the second transmission line bus fault condition section is given. Enter the part. Therefore, in the determination of the accident aspect of the comprehensive accident determination unit, when the transmission line accident condition and the transmission line bus accident condition are satisfied at the same time, priority is given to the determination based on the transmission line bus accident condition, and the bus protection relay and the transmission line protection relay Can be determined as a bus accident.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0022]
FIG. 1 is a block diagram showing a first embodiment of the present invention. In the figure, the system stabilizing device of the present invention includes an information input unit 10, a first transmission line accident condition unit 20, a second transmission line accident condition unit 25, a first transmission line bus accident condition unit 50, The second transmission line bus accident condition unit 60 and the general accident determination unit 70 are configured.
[0023]
The information input unit 10 includes operating conditions 12A, 12B, and 12C for power transmission line protection relays for the power transmission line 1L, operating conditions 15A, 15B, and 15C for power transmission line protection relays for the power transmission line 2L, and bus protection relays on the bus side. Operation condition 13A, operation condition 13B of the bus protection relay on the second bus side, breaker “open” state 11A, 11B, 11C of transmission line 1L, breaker “open” state 14A, 14B of transmission line 2L, 14C, state 16A of the busbar side disconnector “open” of the transmission line 1L, state 16B of the busline side disconnector “open”, state 17A of the busbar side disconnector “open” of the transmission line 2L, and the otobus line The side disconnector “open” state 17B is taken in and these conditions / states are output.
[0024]
The first transmission line accident condition unit 20 is the OR circuit 20A, 20B, 20C, the operation condition 12A, 12B, 12C of the transmission line protection relay of the transmission line 1L is “1”, or the circuit breaker states 11A, 11B of the transmission line 1L , 11C is “1”, transmission line fault signals 21A, 21B, 21C are output.
[0025]
The second transmission line accident condition unit 25 is the OR circuit 25A, 25B, 25C, the operation condition 15A, 15B, 15C of the transmission line protection relay of the transmission line 2L is “1”, or the circuit breaker states 14A, 14B of the transmission line 2L , 14C is “1”, transmission line fault signals 26A, 26B, 26C are output.
[0026]
The first transmission line bus accident condition unit 50 determines that the circuit breaker states 11A, 11B, and 11C of the transmission line 1L are all “open” by the AND circuit 50A, and the knot circuits 51A and 51C transmit the transmission line 1L. Is determined not to stop, and it is determined that the transmission line 1L is connected to the busbar side by the AND circuit 52A with the output of the knot circuit 51B of the disconnector “open” state 16A on the busbar side. Similarly, it is determined that the transmission line 1L is connected to the maiden bus side by the AND circuit 52B with the output of the knot circuit 51D in the state 16B of the disconnector “open” on the maiden bus side. And, when the operating condition 13A of the bus protection relay on the side of the bus is input when the transmission line 1L is connected to the side of the bus with the AND circuit 53A, or the power line 1L is connected to the side of the bus with the AND circuit 53B When the operating condition 13B of the bus protection relay on the second bus side is input at the time when the power line is being operated, the power transmission line 1L is determined to be an accident, and a power transmission line bus fault signal 55 is output through the OR circuit 54. The transmission line bus fault signal 55 is output as a three-phase fault in order to make a three-phase batch interruption for the bus fault.
[0027]
The second transmission line bus fault condition unit 60 determines that the circuit breaker states 14A, 14B, and 14C of the transmission line 2L are all “open” by the AND circuit 60A, and uses the knot circuits 61A and 61C to transmit the transmission line 2L. It is determined that the power transmission line 2L is connected to the busbar side by the AND circuit 62A with the output of the knot circuit 61B in the state 17A of the disconnector “open” on the busbar side. Similarly, it is determined that the transmission line 2L is connected to the maiden bus side by an AND circuit 62B with the output of the knot circuit 61D in the state 17B of the disconnector “open” on the maiden bus side. Then, when the operation condition 13A of the bus protection relay on the side of the bus is input when the transmission line 2L is connected to the side of the bus with the AND circuit 63A, or the power line 2L is connected to the side of the bus with the AND circuit 63B. When the operation condition 13B of the bus protection relay on the O bus side is input, the power transmission line 2L is determined to be an accident, and the power line bus fault signal 65 is output through the OR circuit 64. The transmission line bus fault signal 65 is output as a three-phase fault in order to make a three-phase batch interruption for the bus fault.
[0028]
The comprehensive accident determination unit 70 inputs the accident signals 73A, 73B, and 73C from the transmission line accident signals 21A, 21B, and 21C and the transmission line bus accident signal 55 of the transmission line 1L through the OR circuits 70A, 70B, and 70C, and transmits the transmission line 2L. Accident signals 74A, 74B, and 74B are input through the OR circuits 71A, 71B, and 71C from the transmission line accident signals 26A, 26B, and 26C and the transmission line bus accident signal 65. The accident determination unit 76 uses the accident signals 73A, 73B, 73C, 74A, 74B, and 74C as input signals, determines the accident aspect based on the above-mentioned Table 1, and determines the one-phase accident start signal 75A and the two-phase accident start signal. One of the start signal 75C of the same phase / three-phase accident as 75B, the start signal 75D of the open phase accident, and the start signal 75E of the route break accident is output.
[0029]
Thus, in the 1st power transmission line bus fault condition part 50, based on circuit breaker state 11A, 11B, 11C and disconnector state 16A, 16B, the relation between former A, the Oto bus line, and power transmission line 1L is specified, and bus line When the protection relay operates (operating conditions 13A and 13B), the power transmission line connected to the bus is determined to be an accident. Then, the power transmission line fault signal 55 from the first power transmission line fault condition section 50 is input to the general accident determination section 70 together with the power transmission line accident signals 21A, 21B, and 21C of the first power transmission line accident condition section 20. Accident judgment is performed.
[0030]
Similarly, the second power line bus fault condition unit 60 identifies the relationship between the former A, the second bus line, and the power transmission line 2L based on the breaker states 14A, 14B, 14C and the disconnector states 17A, 17B, and protects the bus. When the relay operates (operating conditions 13A and 13B), the power transmission line connected to the bus is determined to be an accident. Then, the power transmission line fault signal 65 from the second power transmission line bus accident condition section 60 is input to the general accident determination section 70 together with the power transmission line accident signals 26A, 26B, and 26C of the second power transmission line accident condition section 25. Accident judgment is performed.
[0031]
Since such a configuration is adopted, it is possible to correctly determine an accident even if the transmission line is stopped or the bus is stopped, and the operation state of each bus is not limited.
[0032]
FIG. 2 is a block diagram showing a second embodiment of the present invention. In the figure, the system stabilizing device of the present invention includes an information input unit 10, a first transmission line accident condition unit 20, a second transmission line accident condition unit 25, a first transmission line bus accident condition unit 50, The second transmission line bus accident condition unit 60, the first transmission line stop condition unit 80, the second transmission line stop condition unit 90, and the comprehensive accident determination unit 70 are configured.
[0033]
Among these configurations, the information input unit 10, the first power transmission line accident condition unit 20, the second power transmission line accident condition unit 25, the first power transmission line stop condition unit 80 and the second power transmission line stop condition unit 90 other than the first power transmission line stop condition unit 80 and the second power transmission line stop condition unit 90. The transmission line bus accident condition unit 50, the second transmission line bus accident condition unit 60, and the general accident determination unit 70 are the same as those in FIG. However, regarding the comprehensive accident determination unit 70, some input conditions are different, but this point will be described later.
[0034]
The first power transmission line stop condition unit 80 determines that the circuit breaker states 11A, 11B, and 11C of the power transmission line 1L are all “open” by the AND circuit 80A, or the disconnector state 16A on the side of the main line. Is determined to be “open” and the disconnector state 16B on the bus line side is “open” by the AND circuit 80B. Then, the outputs of both AND circuits 80A and 80B are applied to the timer 82 through the OR circuit 81, and it is determined that the power transmission line 1L is stopped after the time T which is the set time of the timer 82, and the power transmission line 1L stop signal 83 is generated. Output.
[0035]
In addition, the second transmission line stop condition unit 90 determines that the circuit breaker states 14A, 14B, and 14C of the transmission line 2L are all “open” by the AND circuit 90A, or the disconnector on the side of the bus line. The AND circuit 90B determines that the state 17A is “open” and the disconnector state 17B on the Otomo line side is “open”. Then, the outputs of both AND circuits 90A and 90B are applied to the timer 92 through the OR circuit 91, and it is determined that the power transmission line 2L is stopped after T time which is the set time of the timer 92, and the power transmission line 2L stop signal 93 is sent. Output.
[0036]
The comprehensive accident determination unit 70 inputs the accident signals 73A, 73B, and 73C from the transmission line accident signals 21A, 21B, and 21C of the transmission line 1L and the transmission line bus accident signal 55 to the accident determination unit 76 through the OR circuits 70A, 70B, and 70C. Further, the accident signals 74A, 74B, and 74B are input to the accident determination unit 76 through the OR circuits 71A, 71B, and 71C from the transmission line accident signals 26A, 26B, and 26C of the transmission line 2L and the transmission line bus accident signal 65. Further, the general accident determination unit 70 uses the power transmission line 1L stop signal 83 from the first power transmission line stop condition unit 80 and the power transmission line 2L stop signal 93 from the second power transmission line stop condition unit 90 as new inputs as the accident determination unit. Input to 76.
[0037]
In the accident determination unit 76, if the power transmission line 1L stop signal 83 and the power transmission line 2L stop signal 93 are “0”, the accident signals 73A, 73B, 73C, 74A, 74B, and 74C are used as input signals, and the accident aspect is shown in Table 1. One-phase accident start signal 75A, two-phase accident start signal 75B, same-phase / three-phase accident start signal 75C, open phase accident start signal 75D, and route disconnection accident start signal 75E. Output one.
[0038]
However, if the transmission line 1L stop signal 83 is “1”, the accident aspect is determined based on Table 2 using the accident signals 74A, 74B, and 74C of the transmission line 2L as input signals.
[0039]
[Table 2]

[0040]
Table 2 shows that when the transmission line 1L stop signal 83 is “1”, the accident signals 74A, 74B, and 74C of the transmission line 2L are used as input signals, and when the transmission line 2L stop signal 93 is “1”. The accident aspect is judged using the 1L accident signals 73A, 73B, 73C as input signals. In Table 2, the accident signal pattern illustrated as an example corresponds to each accident aspect, the upper side represents the accident signals 73A, 73B, and 73C, the lower side represents the stop of the transmission line 2L, and the black circle represents “1” with the accident signal. The white circle represents “0” without an accident signal.
[0041]
Therefore, the accident determination unit 76 outputs one of the phase failure accident activation signal 40D and the route interruption accident activation signal 40E corresponding to each accident aspect based on Table 2. Then, system stabilization measures are taken according to the types of the activation signals 40D and 40E from the accident determination unit 76.
[0042]
If the transmission line 2L stop signal 93 is “1”, the accident signal 73A, 73B, 73C of the transmission line 1L is used as an input signal, the accident aspect is determined based on Table 2, and the open phase accident start signal (75D ) And a route break accident start signal (75E).
[0043]
As described above, the first power transmission line stop condition unit 80 gives the power transmission line 1L stop signal 83 to the accident determination unit 76 based on the circuit breaker states 11A, 11B, 11C and the disconnector states 16A, 16B. The power transmission line stop condition unit 89 gives the power transmission line 2L stop signal 93 to the accident determination unit 76 based on the circuit breaker states 14A, 14B, 14C and the disconnector states 17A, 17B. In the accident determination unit 76, the determination of the accident mode is switched from Table 1 to Table 2 based on the transmission line 1L stop signal 83 or the transmission line 2L stop signal 93. Even if it becomes, it can be judged that it is a busbar accident, and appropriate system stabilization control can be performed.
[0044]
FIG. 3 is a block diagram showing a third embodiment of the present invention. In the figure, the system stabilizing device of the present invention includes an information input unit 10, a first transmission line accident condition unit 20, a second transmission line accident condition unit 25, a first transmission line bus accident condition unit 50, The second transmission line bus accident condition unit 60 and the general accident determination unit 70 are configured.
[0045]
Of this configuration, the information input unit 10, the first transmission line accident condition unit 20, the second transmission line accident condition unit 25, the first transmission line bus accident condition unit 50, and the second transmission line bus accident condition unit 60 are shown in FIG. However, the overall accident determination unit 70 is partially different.
[0046]
In the comprehensive accident determination unit 70, an AND circuit is used for the transmission line bus accident signal 55 input from the first transmission line bus accident condition unit 50 and the transmission line bus accident signal 65 input from the second transmission line bus accident condition unit 60. It is applied to 77A to determine whether or not the power transmission line is disconnected.
[0047]
When the transmission line is disconnected (the output of the AND circuit 77A is “1”), a route disconnection accident start signal 75E is output through the OR circuit 77C, and the signal is transmitted to the accident determination unit 76 via the knot circuit 77B. Apply.
[0048]
On the other hand, when it is determined that the route disconnection accident does not occur (the output of the AND circuit 77A is “0”), the transmission line accident signals 21A, 21B, 21C, 26A, 26B, and 26C are used as input signals to the accident determination unit 76, Based on Table 1, the start signal 75A for the one-phase accident, the start signal 75B for the two-phase accident, the start signal 75C for the same phase / three-phase accident, the start signal 75D for the phase loss accident, and the start signal for the route break accident One of 75E is output.
[0049]
According to this configuration, both the transmission line bus fault signal input from the first transmission line bus fault condition section and the transmission line bus fault signal input from the second transmission line bus fault condition section are "1". Thus, the start signal 75E of the route break accident from the accident determination unit 76 is output. In other words, when a transmission line is disconnected due to a bus accident, priority is given to the disconnection of the transmission line as a determination of the accident aspect of the general accident determination unit. As a result, it is possible to correctly determine that the route is disconnected when the transmission line is disconnected due to a bus failure during the operation of the two buses.
[0050]
FIG. 4 is a block diagram showing a fourth embodiment of the present invention. In the figure, the system stabilizing device of the present invention includes an information input unit 10, a first transmission line accident condition unit 20, a second transmission line accident condition unit 25, a first transmission line bus accident condition unit 50, The second transmission line bus accident condition unit 60 and the general accident determination unit 70 are configured.
[0051]
Of this configuration, the information input unit 10, the first transmission line accident condition unit 20, the second transmission line accident condition unit 25, the first transmission line bus accident condition unit 50, and the second transmission line bus accident condition unit 60 are shown in FIG. However, the overall accident determination unit 70 is partially different.
[0052]
In the general accident determination unit 70, as in FIG. 3, the transmission line bus signal 55 input from the first transmission line bus accident condition unit 50 and the transmission line bus input from the second transmission line bus accident condition unit 60. The accident signal 65 is applied to the AND circuit 77A to determine whether or not the power transmission line is disconnected.
[0053]
When the route of the power transmission line is broken (the output of the AND circuit 77A is “1”), a route break accident start signal 75E is output through the OR circuit 77C.
[0054]
Further, the AND circuit 78C and the knot circuit 78D or the AND circuit 78E are received in response to the transmission line bus fault signal 55 of the first transmission line bus fault condition unit 50 and the transmission line bus fault signal 65 of the second transmission line bus fault condition unit 60. And the knot circuit 78F determines that a one-bus accident occurs in the case of either the first or second bus, and outputs a start signal 75G for the first-bus accident through the OR circuit 78G. At this time, the transmission line bus accident signal 55 of the first transmission line bus accident condition section 50 and the transmission line bus accident signal 65 of the second transmission line bus accident condition section 60 are determined as an accident via the OR circuit 78A and the knot circuit 78B. It gives to part 76 and inputs that it is a busbar accident.
[0055]
On the other hand, if neither the transmission line bus accident signal 55 of the first transmission line bus accident condition section 50 nor the transmission line bus accident signal 65 of the second transmission line bus accident condition section 60 is generated, the transmission line accident signal 21A, 21B, 21C, 26A, 26B, and 26C are used as input signals to the accident determination unit 76, the accident aspect is determined based on Table 1, and the same phase as the one-phase accident start signal 75A and the two-phase accident start signal 75B One of the three-phase accident start signal 75C, the phase loss accident start signal 75D, and the route break accident start signal 75E is output.
[0056]
Thus, in the comprehensive accident determination unit 70, the transmission line bus accident signal 55 input from the first transmission line bus accident condition unit 50 and the transmission line bus accident signal 65 input from the second transmission line bus accident condition unit 60. , It is determined that the transmission line is in a route cut state, and a route cut accident start signal 75E is output. In addition, any one of the transmission line bus accident signal 55 input from the first transmission line bus accident condition unit 50 and the transmission line bus accident signal 65 input from the second transmission line bus accident condition unit 60 is given. A one-bus accident is determined, and a one-bus accident start signal 75G is output. Then, at least one of the transmission line bus accident signal 55 input from the first transmission line bus accident condition section 50 and the transmission line bus accident signal 65 input from the second transmission line bus accident condition section 60 is given. To the accident determination unit 76. Therefore, in the determination of the accident aspect of the comprehensive accident determination unit 70, when the transmission line accident condition and the transmission line bus accident condition are satisfied at the same time, priority is given to the determination based on the transmission line bus accident condition, and the bus protection relay and the transmission line protection Even when the relay operates at the same time, it is possible to determine that there is a bus accident.
[0057]
FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In the figure, the system stabilizing device of the present invention includes an information input unit 10, a first transmission line accident condition unit 20, a second transmission line accident condition unit 25, a first transmission line bus accident condition unit 50, The second transmission line bus accident condition unit 60, the first transmission line stop condition unit 80, the second transmission line stop condition unit 90, and the comprehensive accident determination unit 70 are configured.
[0058]
Among these configurations, the information input unit 10, the first transmission line accident condition unit 20, the second transmission line accident condition unit 25, the first transmission line bus accident condition unit 50, the second transmission line bus accident condition unit 60, the first The power transmission line stop condition unit 80 and the second power transmission line stop condition unit 90 are the same as in FIG. However, with respect to the comprehensive accident determination unit 70, some input conditions are different.
[0059]
In the general accident determination unit 70, after the transmission line bus accident signal 55 input from the first transmission line bus accident determination unit 50 is input in the OR circuit 72A, after the set time T of the timer 72B or the transmission line stop signal 83 is input. It is determined that the transmission line 1L has been stopped. In addition, when the transmission line bus accident signal 65 input from the second transmission line bus accident determination unit 60 is input in the OR circuit 72C, after the set time T of the timer 72D, or when the transmission line stop signal 93 is input. It is determined that the transmission line 2L is stopped.
[0060]
In the accident determination unit 76, if neither the transmission line 1L nor the transmission line 2L is stopped, the accident aspect is determined based on Table 1, and the one-phase accident start signal 75A and the two-phase accident start signal 75B have the same name. One of a phase accident start signal 75C, a phase loss accident start signal 75D, and a route break accident start signal 75E is output. If the transmission line 1L is stopped, the accident signals 74A, 74B, and 74C of the transmission line 2L are used as input signals, the accident aspect is determined based on Table 2, the start signal 75D of the phase loss accident and the start of the route break accident If any one of the signals 75E is output and the transmission line 2L is stopped, the accident signals 73A, 73B, 73C of the transmission line 1L are used as input signals, the accident aspect is determined based on Table 2, and One of the start signal 75D and the route break accident start signal 75E is output.
[0061]
Thus, in the accident determination unit 76, in addition to the transmission line 1L stop signal 83 or the transmission line 2L stop signal 93, the transmission line bus fault signal 55 and the second transmission line bus fault of the first transmission line bus fault condition unit 50 Since it is input from the transmission line bus accident signal 65 of the condition unit 60 through the timers 72B and 72D in the same manner as the stop signal, the determination of the accident aspect is determined by switching from Table 1 to Table 2. From the outputs of the first transmission line bus accident condition unit 50 and the first transmission line bus accident condition unit 60, it is possible to determine the stop of the transmission line and switch the judgment of the accident aspect of the general accident determination unit. It is no longer erroneously determined as a power line accident under the circuit breaker “open” condition due to operation, and appropriate system stabilization control can be performed.
[0062]
【The invention's effect】
According to the first aspect of the present invention, the comprehensive accident determination unit determines the accident from the output of the transmission line accident condition and the transmission line bus accident condition, thereby limiting the transmission line to the line stop, the bus stop, and the bus operation state. Appropriate control can be performed without being done.
[0063]
According to the second aspect of the present invention, by switching the judgment of the comprehensive accident judging unit according to the transmission line stop condition, it is possible to perform appropriate control in order to determine a bus fault even if a route break occurs due to a bus fault while the transmission line is stopped. Can do.
[0064]
According to the third aspect of the present invention, when the power transmission line is disconnected during a bus accident during the operation of the two-bus, priority is given to the route disconnection, thereby preventing excessive control.
[0065]
According to the invention described in claim 4, when the busbar protection relay and the power transmission line protection relay operate simultaneously due to an internal fault of the circuit breaker during one-line operation, it is excessive by giving priority to the determination based on the busbar protection relay operation. No control is performed.
[0066]
According to the invention described in claim 5, by judging that the transmission line is stopped immediately after the operation of the bus protection relay, it is erroneously determined as a power transmission line accident under the circuit breaker "open" condition by the operation of the bus protection relay. This eliminates excessive control.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a system stabilizing device according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram of a system stabilizing device according to a second embodiment of the present invention.
FIG. 3 is a configuration diagram of a system stabilizing apparatus according to a third embodiment of the present invention.
FIG. 4 is a configuration diagram of a system stabilizing device according to a fourth embodiment of the present invention.
FIG. 5 is a configuration diagram of a system stabilizing apparatus according to a fifth embodiment of the present invention.
FIG. 6 is a configuration diagram of a conventional system stabilizing device.
[Explanation of symbols]
10 Information input section
20 First Transmission Line Accident Condition Section
25 Second Transmission Line Accident Condition Section
50 First transmission line bus accident condition section
60 Second transmission line bus accident condition section
70 General Accident Judgment Department
80 First transmission line stop condition section
90 Second transmission line stop condition section

Claims (2)

Two power buses are connected to one power transmission line, the power transmission line and the bus are connected to one circuit breaker and one bus disconnector via one disconnector, and an accident has occurred in the power transmission line. Detects that an accident has occurred in the power line protection relay and bus that detects and outputs an open command to the circuit breaker connected to the power transmission line, and issues an open command to the circuit breaker connected to the bus where the accident occurred In the system stabilization device that detects the occurrence of an accident based on the operation with the output busbar protection relay and makes an appropriate accident determination,
An information input unit for inputting an operating condition of the power transmission line protection relay, an operating condition of the bus protection relay, a circuit breaker state, a disconnector state for determining a bus line to which the power transmission line is connected, and
A transmission line accident condition part for judging an operation of a transmission line protection relay input from this information input part or a transmission line whose circuit breaker is "open" as an accident,
From the circuit breaker state and disconnector state from the information input unit, it is determined whether or not the bus and the power transmission line are connected, and when the bus protection relay is activated, the power transmission line connected to the bus is regarded as an accident. A first transmission line bus fault condition part and a second transmission line bus fault condition part to be determined;
While determining the accident aspect of the transmission line from the output of the transmission line accident condition part, and providing a comprehensive accident determination unit that outputs a signal corresponding to the accident aspect,
When an accident condition is output from both the first transmission line bus accident condition part and the second transmission line bus accident condition part, a route disconnection signal of the transmission line is output with priority over other signals. System stabilization device. If the transmission accident condition and the first transmission line bus accident condition or the second transmission line bus accident condition are satisfied at the same time in the judgment of the accident aspect of the comprehensive accident determination unit, the first transmission line bus accident condition or the second transmission fault condition is satisfied. The system stabilizing device according to claim 1, further comprising a function of giving priority to the electric wire bus accident condition.

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