JP4018497B2 - Accident line selection relay device - Google Patents

Accident line selection relay device Download PDF

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JP4018497B2
JP4018497B2 JP2002293723A JP2002293723A JP4018497B2 JP 4018497 B2 JP4018497 B2 JP 4018497B2 JP 2002293723 A JP2002293723 A JP 2002293723A JP 2002293723 A JP2002293723 A JP 2002293723A JP 4018497 B2 JP4018497 B2 JP 4018497B2
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power receiving
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power
ground fault
transformer
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JP2004129465A (en
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修 上村
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Toshiba Corp
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Toshiba Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、受電線と受電変圧器で構成される複数の受電回線が受電変圧器二次で並列運用される系統における事故回線を選択する事故回線選択保護装置に関する。
【０００２】
【従来の技術】
送電線から複数の変圧器を介して複数の配電線を設け、各配電線毎に地絡順序開閉器を設け、遮断器が導通しているか否かによって自配電線の遮断器の試開放タイミングまでの時間を変更することによって、同時に２つの配電線が遮断されることがないようにして、微地絡発生の配電線を特定する（特開平９−１０３０２６号公報参照）技術、あるいは母線地絡を検知すると、所定の時間後に母線遮断器を開放し、地絡が検知されなくなると、母線連絡遮断器を復帰してプロテクタ遮断器を開放し、地絡事故のネットワーク母線を切り離す（特開平１１−２９９０８７号公報参照）技術が知られている。また、受電線と受電変圧器で構成される複数の受電回線が受電変圧器二次で並列運用される系統の地絡事故回線を選択する事故回線選択継電装置が知られている。
【０００３】
このような地絡事故回線を選択する事故回線選択継電装置を図８の受電保護系統図を参照して説明する。
需要家の電力は電力会社の送電設備１から遮断器２、３を介した複数の送電回線で供給される。需要家では前記複数の送電回線を受電遮断器５，６及び、それぞれの受電用変圧器７，８、変圧器二次遮断器９，１０を介して需要家母線電圧に降圧して負荷へ供給する。複数の受電回線は負荷の増大や、受電電源の無停電切替など必要に応じて並列運用される。この様に運用される系統の送電線事故回線選択保護は、それぞれの送電線両端（電力会社の送電端と需要家の受電端）に一体の装置として設備される保護装置情報を搬送キャリア、或いはパイロットワイヤ方式で連携して、電力会社と需要家を同時遮断する送電線区間保護装置が適用される。
【０００４】
次に、事故検出の概要を図８の受電保護系統図を参照して説明する。例えば、地絡事故が１号送電線の４の箇所で発生したとすると、事故回線側の電力会社送電端遮断器２の経路から（地絡電流が送電線方向に）流出し、需要家の受電端遮断器５の経路でも受電変圧器７一次の中性点を介して、零相インピーダンス分布に応じた地絡電流が送電線へ流出する。一方、健全回線側の電力会社送電端遮断器３の経路では、需要家の受電変圧器８一次の中性点を介した零相インピーダンス分布に応じた地絡電流が送電線から流入する。つまり、送電線区間保護装置は電力会社送電端と需要家受電端との事故方向情報の送信連絡により双方とも事故が送電線方向の時、事故送電線の両端遮断器２、５を同時遮断するように構成されている。
【０００５】
また例えば、短絡事故が１号送電線の４の箇所で発生したとすると、事故回線側の電力会社送電端の遮断器２の経路から過大電流が流出し、需要家の受電端遮断器５からも健全回線を迂回する事故インピーダンス分布に応じた事故電流が流出し、事故回線の両端の区間保護装置は双方とも送電線側事故情報の送信連絡により両端遮断器２、５を同時遮断するように構成されている。
【０００６】
【発明が解決しようとする課題】
上述したように、従来の事故回線選択保護装置は性能上の問題はないが、設備・経費・調整試験・保守点検に関し、次のような課題がある。
▲１▼ 電力会社送電端と需要家受電端の両区間保護装置情報を連携する通信ケーブル、通信装置などの布設工事や経費面で大きな負担となっている。
▲２▼ 電流反衡パイロットワイヤ方式の場合、両端装置及び実通信路との組み合わせ微調整が必要で、インダクタンス整合、インピーダンス整合など調整試験が困難で熟練度を要し、長距離通信路ゆえのサージ対策や絶縁対策が不十分となる危険要因が潜在する。
▲３▼ 性能維持のための定期点検は電力会社側と需要家側の同時実施で制約され、通信ケーブルや通信装置点検など保守増大要因となっている。
【０００７】
本発明は上記課題を解決するためになされたもので、その課題は電力会社送電端の保護装置と独立分離した需要家受電端の事故回線選択保護装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記課題を解決するために請求項１に記載の発明は、受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、前記各それぞれの受電変圧器一次中性相に接続された計器用変流器の二次電流から地絡電流を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段を備えたことを特徴とする。
【０００９】
請求項１によると、それぞれの受電変圧器一次中性相に接続された計器用変流器の二次電流から地絡電流を求め、任意に設定した値と比較演算を行い受電回線の地絡を検出し、これら検出の結果、いずれかの受電回線が並列運用中に、当該受電回線同士の受電地絡検出に不一致が生じ、この不一致が任意の時間継続した場合に地絡検出側の受電回線を地絡事故回線と判定する。
【００１０】
請求項２記載の発明は、受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、それぞれの受電点に接続された計器用変流器の二次或いは、三次電流の三相ベクトルから生成されるそれぞれの受電回線の零相電流を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段を備えたことを特徴とする。
【００１１】
請求項２によると、それぞれの受電点に接続された計器用変流器の二次或いは、三次電池の三相ベクトルから生成されるそれぞれの受電回線の零相電流を求め、任意に設定した値と比較演算を行い受電回線の地絡を検出し、これら検出の結果、いずれかの受電回線が並列運用中に、当該受電回線同士の受電地絡検出に不一致が生じ、この不一致が任意の時間継続した場合に地絡検出側の受電回線を地絡事故回線と判定する。
【００１２】
請求項３記載の発明は、受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、それぞれの受電点に接続された計器用変圧器の二次或いは、三次電圧の三相ベクトルから生成されるそれぞれの受電回路の零相電圧を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段を備えたことを特徴とする。
【００１３】
請求項３によると、それぞれの受電点に接続された計器用変圧器の二次或いは、三次電圧の三相ベクトルから生成されるそれぞれの受電回路の零相電圧を求め、任意に設定した値と比較演算を行い受電回線の地絡を検出し、これら検出の結果、いずれかの受電回線が並列運用中に、当該受電回線同士の受電地絡検出に不一致が生じ、この不一致が任意の時間継続した場合に地絡検出側の受電回線を地絡事故回線と判定する。
【００１４】
請求項４記載の発明は、受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、それぞれの受電点に接続された計器用変圧器の二次電圧からそれぞれの受電回線の電圧値または、三相ベクトルから生成される面積を求め、任意に設定した値と比較演算を行う受電電圧検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電電圧検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電電圧検出結果の不一致継続時間とそれぞれの受電電圧検出結果から短絡事故回線を選択する回線選択処理手段を備えたことを特徴とする。
【００１５】
請求項４によると、それぞれの受電変圧器一次の計器用変圧器二次電圧からそれぞれの受電不足電圧を検出し、これら検出の結果、いずれかの受電回線が並列運用中に、当該受電回線同士の受電不足電圧検出に不一致が生じ、この不一致が任意の時間継続した場合に不足電圧検出側の受電回線を短絡事故回線と判定する。
【００１６】
【発明の実施の形態】
本発明の実施形態を図を参照して説明する。
図１は本発明の第１実施形態の受電保護系統図であり、図４は本発明の地絡事故回線選択処理の概要図、図５は本発明による地絡事故回線選択処理のタイムチャートである。
【００１７】
図１において、需要家の電力は電力会社の送電設備１から遮断器２、３を介した複数の送電回線で供給されている。需要家では複数の送電回線を受電遮断器５，６及び、それぞれの受電用変圧器７，８、変圧器二次遮断器９，１０を介して需要家母線電圧に降圧して負荷へ電力が供給されている。また需要家のそれぞれ受電回線の変圧器一次中性点に設置する計器用変流器の二次電流を受電地絡事故検出手段１４、１５に入力して、受電変圧器中性相に流れる地絡電流から受電地絡事故検出を実行する。また、電力系統機器５，６，９，１０、１１の状態も回線選択保護装置１８に入力し、回線選択情報として処理する。回線選択保護装置１８は受電電力系統機器の状態情報と、受電地絡事故検出１４，１５の動作情報から地絡事故回線の選択処理を実行して事故当該回線の受電遮断器５、もしくは受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００１８】
図４を参照して本発明の事故回線選択処理１８の概要を説明する。
図中、各ブロックに付した図１と同じ符号は、図１の説明と同様である、それぞれの受電地絡事故検出１４、１５の動作情報は事故回線判定処理１９で読み込まれ、表１のような回線選択判定を実行する。
【００１９】
【表１】

Figure 0004018497
【００２０】
一方、系統機器５，６，９，１０，１１の各情報は、ループ中検出処理２０で読み込まれる。図１の場合、系統機器５，６，９，１０，１１の全てが閉合の場合にループ運転中と判定する。事故回線判定処理１９の判定結果情報はループ中検出処理２０の判定結果情報とそれぞれ論理積処理２１、２２され、任意の継続時間カウント処理２３、２４を介して事故回線選択の当該受電遮断器５、もしくは当該受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００２１】
図５を参照して本発明の事故回線選択処理タイムチャートを説明する。
図中、各ブロックに付した図１と同じ符号は、図１の説明と同様である、複数の受電回線は負荷の増大や、受電電源の無停電切替など必要に応じて並列運用される。受電が並列運用されている場合に送電線の事故点４で事故▲１▼が生じると、需要家受電端の並列運用中の全受電変圧器中性点に地絡電流が流れ、全受電回線の地絡事故が検出される▲２▼ａ,▲２▼ｂ。同時に、地絡送電線の電力会社送電端遮断器２経路から流出する過大電流で電力会社送電端保護装置１６が動作して▲２▼、送電端遮断器２を遮断する▲３▼。送電端遮断器２の開放で事故回線の電力会社送電端保護装置１６は復帰し▲４▼、事故点４は需要家の受電変圧器７，８を介して健全側送電経路に接続される。この結果、需要家健全送電線側の受電変圧器８の中性点地絡電流は消滅するが、事故送電線側の受電変圧器７の中性点には事故点４への地絡電流が継続する。
【００２２】
すなわち、送電端遮断器２の開放で需要家の事故側送電線の受電地絡検出１４は継続し、健全側送電線の受電地絡検出は復帰する▲５▼。一方、事故側送電線の受電遮断器は閉合状態であり、当該受電電圧検出も動作継続する。つまり、電力会社の事故送電端遮断器が開放した後は、需要家側系統はループ中検出を継続し、受電事故回線の受電地絡検出も継続、健全側の受電地絡検出は復帰▲５▼し、復帰状態を継続する、従って、図４の事故回線選択処理で説明したように、任意時間ｔｄ後に地絡回線選択遮断指令▲６▼が出力されて需要家の事故受電遮断器５が開放▲７▼し、地絡事故送電線が切り離され▲８▼、需要家のループ中検出も復帰し▲９▼、地絡回線選択指令(10)も復帰する。
【００２３】
以上説明したように、本発明の回線選択保護装置１８は地絡事故回線選択判定時限ｔｄを極力小さく（受電地絡検出の動作処理―復帰処理に要する時間特性差にマージンを加えた値）整定すれば、電力会社送電端事故遮断に連続した次段（２段）時限保護の事故回線選択遮断を可能にする。
【００２４】
図２は本発明の第２実施形態の受電保護系統図であり、図４は本発明の地絡事故回線選択処理の概要図、図５は本発明による地絡事故回線選択処理のタイムチャートである。
【００２５】
図２において、需要家の電力は電力会社の送電設備１から遮断器２、３を介した複数の送電回線で供給される。需要家では複数の送電回線を受電遮断器５，６及び、それぞれの受電用変圧器７，８、変圧器二次遮断器９，１０を介して需要家母線電圧に降圧して負荷へ供給する。また需要家のそれぞれ受電回線に接続された計器用変流器の二次或いは、三次電流を回線選択保護装置１８に入力して三相ベクトルから生成されるそれぞれの受電回線の零相電流を求め、受電地絡事故検出１４、１５を実行する。また、電力系統機器５，６，９，１０、１１の状態も回線選択保護装置１８に入力し、回線選択情報として処理する。回線選択保護装置１８は受電電力系統機器の状態情報と、受電地絡事故検出１４，１５の動作情報から地絡事故回線の選択処理を実行して事故回線の受電遮断器５、もしくは受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００２６】
図４を参照して本発明の事故回線選択処理１８の概要を説明する。
図中、各ブロックに付した図２と同じ符号は、図２の説明と同様である、それぞれの受電地絡事故検出１４、１５の動作情報は事故回線判定処理１９で読み込まれ、表２のような回線選択判定を実行する。
【００２７】
【表２】
Figure 0004018497
【００２８】
一方、系統機器５，６，９，１０，１１の各情報は、ループ中検出処理２０で読み込まれる。図２の場合、系統機器５，６，９，１０，１１の全てが閉合の場合にループ運転中と判定する。事故回線判定処理１９の判定結果情報はループ中検出処理２０の判定結果情報とそれぞれ論理積処理２１、２２され、任意の継続時間カウント処理２３、２４を介して事故回線選択の当該受電遮断器５、もしくは当該受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００２９】
図５を参照して本発明の事故回線選択処理タイムチャートを説明する。
図中、各ブロックに付した図１と同じ符号は、図１の説明と同様である、複数の受電回線は負荷の増大や、受電電源の無停電切替など必要に応じて並列運用される。受電が並列運用されている場合に送電線の事故点４で事故▲１▼が生じたとすると、需要家受電端の並列運用中の全受電変圧器中性点に地絡電流が流れ、全受電回線で地絡事故が検出される▲２▼ａ,▲２▼ｂ。同時に、地絡当該送電線の電力会社送電端遮断器２経路から流出する過大電流で電力会社送電端保護装置１６が動作して▲２▼送電端遮断器２を遮断する▲３▼。送電端遮断器２の開放で事故回線の電力会社送電端保護装置１６は復帰し▲４▼、事故点４は需要家の受電変圧器７，８を介して健全側送電経路に接続される。この結果、需要家健全送電線側の受電変圧器８の中性点地絡電流は消滅するが、事故送電線側の受電変圧器７、の中性点には事故点４への地絡電流が継続する。
【００３０】
すなわち、送電端遮断器２の開放で需要家の事故側送電線の受電地絡検出１４は継続し、健全側送電線の受電地絡検出は復帰する▲５▼。一方、事故側送電線の当該受電遮断器は閉合状態であり、当該受電電圧検出も動作継続である。つまり、電力会社の事故送電端遮断器が開放した後は、需要家側系統はループ中検出を継続し、受電事故回線の受電地絡検出も継続、健全側の受電地絡検出は復帰し▲５▼、復帰状態を継続する、従って、図４の事故回線選択処理で説明したように、任意時間ｔｄ後に地絡回線選択遮断指令▲６▼が出力されて需要家の事故受電遮断器５が開放し▲７▼、短絡事故送電線が切り離され▲８▼、需要家のループ中検出も復帰し▲９▼、短絡回線選択指令(10)も復帰する。
【００３１】
以上説明したように、本発明の回線選択保護装置１８は地絡事故回線選択判定時限ｔｄを極力小さく（受電地絡検出の動作処理―復帰処理に要する時間特性差にマージンを加えた値）整定すれば、電力会社送電端事故遮断に連続した次段（２段）時限保護の事故回線選択遮断を可能にする。
【００３２】
図３は本発明の第３実施形態の受電保護系統図、図４は本発明の地絡事故回線選択処理の概要図、図５は本発明による地絡事故回線選択処理のタイムチャートである。
【００３３】
図３において、需要家の電力は電力会社の送電設備１から遮断器２、３を介した複数の送電回線で供給される。需要家では複数の送電回線を受電遮断器５，６及び、それぞれの受電用変圧器７，８、変圧器二次遮断器９，１０を介して需要家母線電圧に降圧して負荷へ供給する。また需要家のそれぞれ受電回線に接続された計器用変圧器の二次或いは三次電圧を回線選択保護装置１８に入力して三相ベクトルから生成されるそれぞれの受電回線の零相電圧を求め、受電地絡事故検出１４、１５を実行する。また、電力系統機器５，６，９，１０、１１の状態も回線選択保護装置１８に入力し、回線選択情報として処理する。回線選択保護装置１８は受電電力系統機器の状態情報と、受電地絡事故検出１４，１５の動作情報から地絡事故回線の選択処理を実行して事故回線の受電遮断器５、もしくは受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００３４】
図４を参照して本発明の事故回線選択処理１８の概要を説明する。
図中、各ブロックに付した図３と同じ符号は、図３の説明と同様である、それぞれの受電地絡事故検出１４、１５の動作情報は事故回線判定処理１９で読み込まれ、表３のような回線選択判定を実行する。
【００３５】
【表３】
Figure 0004018497
【００３６】
一方、系統機器５，６，９，１０，１１の各情報はループ中検出処理２０で読み込まれる。図３の場合、系統機器５，６，９，１０，１１の全てが閉合の場合にループ運転中と判定する。事故回線判定処理１９の判定結果情報はループ中検出処理２０の判定結果情報とそれぞれ論理積処理２１、２２され、任意の継続時間カウント処理２３、２４を介して事故回線選択の当該受電遮断器５、もしくは当該受電遮断器６に地絡選択遮断指令（トリップ信号）を出力する。
【００３７】
図５を参照して本発明の事故回線選択処理タイムチャートを説明する。
図中、各ブロックに付した図３と同じ符号は、図３の説明と同様である、複数の受電回線は負荷の増大や、受電電源の無停電切替など必要に応じて並列運用される。受電が並列運用されている場合に送電線の事故点４で事故▲１▼が生じたとすると、需要家受電端の受電回線に接続された計器用変圧器二次或いは三次電圧の三相ベクトル和に零相電圧が発生し、全受電回線で地絡事故が検出される▲２▼ａ,▲２▼ｂ。同時に、地絡送電線の電力会社送電端の遮断器２経路から流出する過大電流で電力会社送電端保護装置１６が動作して▲２▼送電端遮断器２を遮断する▲３▼。送電端遮断器２の開放で事故回線の電力会社送電端保護装置１６は復帰し▲４▼、事故点４は需要家の受電変圧器７，８を介して健全側送電経路に接続される。この結果、需要家健全送電線側の受電回線に接続された計器用変圧器二次或いは三次電圧の三相ベクトル和の零相電圧は消滅するが、事故送電線側の三相ベクトル和の零相電圧は継続する。
【００３８】
すなわち、送電端遮断器２の開放で需要家の事故側送電線の受電地絡検出１４は継続し、健全側送電線の受電地絡検出１５は復帰する▲５▼。一方、事故側送電線の受電遮断器は閉合状態であり、受電電圧検出も動作継続する。つまり、電力会社の事故送電端遮断器が開放した後は、需要家側系統はループ中検出を継続し、受電事故回線の受電地絡検出も継続、健全側の受電地絡検出は復帰し▲５▼、復帰状態を継続する、従って、図４の事故回線選択処理で説明したように、任意時間ｔｄ後に地絡回線選択遮断指令▲６▼が出力されて需要家の事故受電遮断器５が開放し▲７▼、地絡事故送電線が切り離され▲８▼、需要家のループ中検出も復帰し▲９▼、地絡回線選択指令(10)も復帰する。
【００３９】
以上説明したように、本発明の回線選択保護装置１８は地絡事故回線選択判定時限ｔｄを極力小さく（受電地絡検出の動作処理―復帰処理に要する時間特性差にマージンを加えた値）整定すれば、電力会社送電端事故遮断に連続した次段（２段）時限保護の事故回線選択遮断を可能にする。
【００４０】
図６は本発明の第４実施形態の短絡事故回線選択処理の概要図、図７は本発明による短絡事故回線選択処理のタイムチャートである。
図１の受電保護系統図において、１号線の４の箇所で短絡事故が発生したとすると、回線選択保護装置１８は受電電力系統機器の状態情報と、受電不足電圧検出１４，１５の動作情報から短絡事故回線の選択処理を実行して事故回線の受電遮断器５、もしくは受電遮断器６に短絡選択遮断指令（トリップ信号）を出力する。
【００４１】
図６を参照して本発明の事故回線選択処理１８の概要を説明する。
図中、各ブロックに付した図１と同じ符号は、図１の説明と同様である、それぞれの受電不測電圧検出１４，１５の動作情報は不一致動作検出処理１９で読み込まれ、表４のような回線選択判定を実行する。
【００４２】
【表４】
Figure 0004018497
【００４３】
一方、系統機器５，６，９，１０，１１の各情報はループ中検出処理２０で読み込まれる。図１の場合、系統機器５，６，９，１０，１１の全てが閉合の場合にループ運転中と判定する。事故回線判定処理１９の判定結果情報はそれぞれループ中検出処理２０の判定結果情報と論理積処理２１、２２され、任意の継続時間カウント処理２３、２４を介して事故回線選択の当該受電遮断器５、もしくは当該受電遮断器６に短絡選択遮断指令（トリップ信号）を出力する。
【００４４】
図７を参照して本発明の事故回線選択処理のタイムチャートを説明する。
図中、各ブロックに付した図１と同じ符号は、図１の説明と同様である、複数の受電回線は負荷の増大や、受電電源の無停電切替など必要に応じて並列運用される。受電が並列運用されている場合に送電線の事故点４で短絡事故▲１▼が生じたとすると、需要家受電端の全受電回線で不足電圧▲２▼ａ，▲２▼ｂが検出され、同時に事故回線の電力会社送電端の遮断器２経路から流出する過大電流で電力会社送電端保護装置１６が動作して▲２▼送電端遮断器２を遮断する▲３▼。送電端遮断器２の開放で事故回線の電力会社送電端保護装置１６は復帰し▲４▼、事故点４に流れる短絡電流は送電端遮断器３と需要家受電端遮断器５の健全回線を迂回する。すなわち、事故電流が受電変圧器７，８を介して流れ、短絡インピーダンスの殆んどを受電変圧器７，８のインピーダンスで占めるので、需要家の健全側受電不足電圧検出も復帰する▲５▼。
【００４５】
一方、事故側送電線の受電遮断器は閉合状態であり、受電電圧検出も動作継続である。つまり、電力会社の事故送電端遮断器が開放した後は、需要家側系統はループ中検出を継続し、受電事故回線の受電不足電圧検出も継続、健全側の受電不足電圧検出は復帰し▲５▼、復帰状態を継続する、従って、図６の事故回線選択処理で説明したように、任意時間ｔｄ後に短絡回線選択遮断指令▲６▼が出力されて需要家の事故当該受電遮断器５が開放し▲７▼、短絡事故送電線が切り離され▲８▼、需要家のループ中検出も復帰し▲９▼、短絡回線選択指令(10)も復帰する。
【００４６】
以上説明したように、本発明の回線選択保護装置１８は短絡事故回線選択判定時限ｔｄを極力小さく（不足電圧検出の動作処理―復帰処理に要する時間特性差にマージンを加えた値）制定すれば、電力会社送電端事故遮断に連続した次段（２段）時限保護の事故回線選択遮断を可能にする。
【００４７】
【発明の効果】
以上説明したように、本発明によると、電力会社送電端事故遮断に連続した次段（２段）時限保護ができるので、比較的高速度な保護を可能とする他、電力会社送電端保護装置との独立分離構成も可能となるので、保護装置が簡素化し設備工事が大幅に削減できる。更に、基本的な単一特性リレーである地絡過電流検出あるいは不足電圧検出を主要素としているので、調整試験や保守点検が簡単になり、試験調整の熟練制限や作業性の向上も実現できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態の受電保護系統図。
【図２】本発明の第２実施形態の受電保護系統図。
【図３】本発明の第３実施形態の受電保護系統図。
【図４】本発明の地絡事故回線選択処理の概要図。
【図５】図４の事故回線選択処理タイムチャート。
【図６】本発明の第４実施形態の短絡事故回線選択処理の概要図。
【図７】図６の事故回線選択処理タイムチャート。
【図８】従来の受電保護系統図。
【符号の説明】
１…電力会社の送電設備、２…１号送電遮断器、３…２号送電遮断器、４…１号送電線短絡事故点、５…需要家の１号受電遮断器、６…需要家の２号受電遮断器、７…需要家の１号受電変圧器、８…需要家の２号受電変圧器、９…需要家の１号受電変圧器二次遮断器、１０…需要家の２号受電変圧器二次遮断器、１１…需要家の母線遮断器、１２…１号送電線区間保護装置、１３…２号送電線区間保護装置、１４…需要家の１号受電不足電圧検出手段、１５…需要家の２号受電不足電圧検出手段、１６…電力会社の１号送電保護手段、１７…電力会社の２号送電保護手段、１８…本発明の短絡事故回線選択手段、１９…停電受電回線選択手段、２０…受電ループ運用状態検出処理、２１…１号回線事故判定論理積処理、２２…２号回線事故判定論理積処理、２３…１号事故判定遅延処理、２４…２号事故判定遅延処理、２５…１号受電遮断出力、２６…２号受電遮断出力。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accident line selection protection device for selecting an accident line in a system in which a plurality of power reception lines composed of a power reception line and a power reception transformer are operated in parallel by a power reception transformer secondary.
[0002]
[Prior art]
Provide multiple distribution lines from the transmission line via multiple transformers, provide a ground fault sequence switch for each distribution line, and open the circuit breaker on the distribution line depending on whether the circuit breaker is conducting or not By changing the time to simultaneous The distribution line in which a fine ground fault is generated is specified so that the two distribution lines are not interrupted (see JP-A-9-103026). Technology, Alternatively, if a bus ground fault is detected, the bus breaker is opened after a predetermined time, and if no ground fault is detected, the bus connection breaker is restored, the protector breaker is opened, and the network bus of the ground fault is disconnected. (Japanese Patent Laid-Open No. 11-299087 Gazette See) technology is known. In addition, there is known an accident line selection relay device that selects a ground fault fault line of a system in which a plurality of power reception lines composed of a power reception line and a power reception transformer are operated in parallel on the power reception transformer secondary.
[0003]
A fault line selection relay device for selecting such a ground fault fault line will be described with reference to the power reception protection system diagram of FIG.
The electric power of the customer is supplied from the power transmission facility 1 of the power company through a plurality of power transmission lines via the circuit breakers 2 and 3. At the customer, the plurality of transmission lines are stepped down to the customer bus voltage and supplied to the load via the receiving breakers 5 and 6 and the respective receiving transformers 7 and 8 and the secondary transformer breakers 9 and 10. To do. Multiple power receiving lines are operated in parallel as necessary, such as an increase in load and uninterruptible switching of the power receiving power source. The transmission line accident line selection protection of the system operated in this way is the protection device information installed as an integrated device at both ends of each transmission line (the power transmission end of the power company and the power receiving end of the customer), or the carrier carrier, or A power transmission line section protection device that simultaneously shuts off the power company and the customer is applied in cooperation with the pilot wire system.
[0004]
Next, an outline of accident detection will be described with reference to the power reception protection system diagram of FIG. For example, if a ground fault occurs at 4 locations on the No. 1 power transmission line, the ground fault current will flow out of the route of the power company power transmission terminal breaker 2 on the accident line side (in the direction of the power transmission line), Also in the path of the power receiving end circuit breaker 5, the ground fault current corresponding to the zero-phase impedance distribution flows out to the transmission line via the primary neutral point of the power receiving transformer 7. On the other hand, in the path of the power company power transmission end circuit breaker 3 on the sound line side, a ground fault current corresponding to the zero-phase impedance distribution through the primary neutral point of the customer's power receiving transformer 8 flows from the transmission line. That is, the transmission line section protection device simultaneously shuts off both end circuit breakers 2 and 5 of the accident transmission line when the accident is in the transmission line direction due to the transmission communication of the accident direction information between the power company transmission end and the customer receiving end. It is configured as follows.
[0005]
Further, for example, if a short circuit accident occurs at 4 locations of the No. 1 transmission line, an excessive current flows out from the path of the circuit breaker 2 at the power company power transmission end on the accident line side, and from the power receiving end circuit breaker 5 of the customer The fault current corresponding to the fault impedance distribution that bypasses the healthy line flows out, and both section protection devices at both ends of the fault line simultaneously shut off both circuit breakers 2 and 5 by transmitting transmission line side accident information. It is configured.
[0006]
[Problems to be solved by the invention]
As described above, the conventional accident line selection protection device has no performance problem, but has the following problems with respect to facilities, expenses, adjustment tests, and maintenance inspections.
(1) It is a heavy burden in terms of laying work and expenses such as communication cables and communication devices that link the protection device information on both sections of the power company power transmission end and the customer power reception end.
(2) In the case of the current anti-pilot pilot wire method, it is necessary to make fine adjustments in combination with both-end devices and the actual communication path, adjustment tests such as inductance matching and impedance matching are difficult, and skill level is required. There is a potential risk factor for insufficient surge and insulation measures.
(3) Periodic inspections for maintaining performance are restricted by the simultaneous implementation by the electric power company and the customer, and this is a factor in increasing maintenance such as inspection of communication cables and communication devices.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an accident line selection protection device at a customer power receiving end that is independent from a protection device at an electric power company power transmission end.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. The power receiving line configured as described above is configured to operate in multiple lines in parallel via the bus provided on the load side. In the accident line selection relay device of the power line receiving line, Each Receiving ground fault detection means that calculates the ground fault current from the secondary current of the instrument current transformer connected to the primary neutral phase of each receiving transformer and compares it with an arbitrarily set value, and each receiving line And a receiving line detection means during loop operation for detecting a parallel operation state of a plurality of receiving lines from the open / closed state of a system device such as a disconnector and a breaker of a bus that links each receiving line, and detection of each of the received power ground faults And a line selection processing means for selecting a ground fault fault line according to the mismatch duration of the power receiving ground fault detection results during loop operation and the respective power receiving ground fault detection states from the detection signal of the loop power receiving line detecting means. It is characterized by that.
[0009]
According to claim 1, the ground fault current is obtained from the secondary current of the instrumental current transformer connected to the primary neutral phase of each power receiving transformer, and the ground fault of the power receiving line is performed by comparing with an arbitrarily set value. As a result of these detections, if one of the power receiving lines is operating in parallel, a mismatch occurs in the power receiving ground fault detection between the power receiving lines. The line is determined to be a ground fault line.
[0010]
The invention according to claim 2 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. The power receiving line configured as described above is configured to operate in multiple lines in parallel via the bus provided on the load side. In the fault line selection relay device for the power receiving line of the power system, the secondary or tertiary power supply of the instrumental current transformer connected to each receiving point Flow Power receiving ground fault detection means for calculating a zero-phase current of each power receiving line generated from the three-phase vector and comparing the value with an arbitrarily set value, and each power receiving line and a bus that links each power receiving line Loop operating power receiving line detecting means for detecting a parallel operation state of a plurality of power receiving lines from the open / closed state of a system device such as a disconnector and a circuit breaker, the respective power receiving ground fault detecting means and the loop operating power receiving line detecting means It is characterized by comprising a line selection processing means for selecting a ground fault fault line according to a mismatch duration of received ground fault detection results during loop operation from each detection signal and each received ground fault detection state.
[0011]
According to claim 2, the zero-phase current of each receiving line generated from the three-phase vector of the secondary or tertiary battery of the instrument current transformer connected to each receiving point is obtained and arbitrarily set Is detected and the ground fault of the power receiving line is detected. As a result of these detections, when any power receiving line is operating in parallel, a mismatch occurs in the detection of the power receiving ground fault between the power receiving lines. If it continues, the power receiving line on the ground fault detection side is determined to be a ground fault accident line.
[0012]
The invention described in claim 3 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. The power receiving line configured as described above is configured to operate in multiple lines in parallel via the bus provided on the load side. In the fault line selection relay device of the power receiving line of the power system, the zero-phase voltage of each power receiving circuit generated from the three-phase vector of the secondary or tertiary voltage of the instrument transformer connected to each power receiving point Power receiving ground fault detection means for performing a comparison operation with a value that is obtained and arbitrarily set, and a plurality of power receiving lines based on the open / close state of system equipment such as each power receiving line and the disconnector and breaker of the bus that links each power receiving line Inconsistency in detection results of power receiving ground faults during loop operation from the detection signals of the loop receiving power line detection means and the respective power receiving ground fault detection means and the loop power receiving line detection means Line selection processing means for selecting a ground fault fault line according to the time and each power receiving ground fault detection state is provided.
[0013]
According to claim 3, the zero-phase voltage of each receiving circuit generated from the three-phase vector of the secondary or tertiary voltage of the instrument transformer connected to each receiving point is obtained, and an arbitrarily set value and A comparison operation is performed to detect the ground fault of the power receiving line. As a result of these detections, when any power receiving line is operating in parallel, a mismatch occurs in the detection of the power receiving ground fault between the power receiving lines, and this mismatch continues for an arbitrary time. In this case, the power receiving line on the ground fault detection side is determined as a ground fault accident line.
[0014]
The invention according to claim 4 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. The power receiving line configured as described above is configured to operate in multiple lines in parallel via the bus provided on the load side. In the fault line selection relay device for the power receiving line of the power system, obtain the voltage value of each receiving line or the area generated from the three-phase vector from the secondary voltage of the instrument transformer connected to each receiving point. A receiving voltage detecting means for performing a comparison operation with an arbitrarily set value, and a plurality of receiving lines in parallel from the open / closed state of system equipment such as each receiving line and the disconnector and breaker of the bus that links each receiving line. Receiving voltage detection means during loop operation for detecting the operating state, and the respective received voltage detection means and the detection signal of the received power line detection means during loop operation from the detection signals of the loop operation and the mismatch duration of the received voltage detection results during loop operation, Line selection processing means for selecting a short circuit fault line from the received voltage detection result is provided.
[0015]
According to claim 4, each power receiving undervoltage is detected from the secondary voltage of the primary transformer of each power receiving transformer, and as a result of the detection, any power receiving line is operating in parallel. When a mismatch occurs in the detection of the power reception undervoltage, and this mismatch continues for an arbitrary time, the power reception line on the undervoltage detection side is determined as a short-circuit fault line.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a power reception protection system diagram of the first embodiment of the present invention, FIG. 4 is a schematic diagram of a ground fault line selection process according to the present invention, and FIG. 5 is a time chart of a ground fault line selection process according to the present invention. is there.
[0017]
In FIG. 1, power from a customer is supplied from a power transmission facility 1 of a power company through a plurality of power transmission lines via circuit breakers 2 and 3. At the customer, a plurality of power transmission lines are stepped down to the customer bus voltage via the receiving breakers 5 and 6 and the respective receiving transformers 7 and 8 and the transformer secondary breakers 9 and 10, and power is supplied to the load. Have been supplied. In addition, the secondary current of the current transformer for the instrument installed at the primary neutral point of the transformer of each receiving line of the customer To the power receiving ground fault detection means 14 and 15 Input, ground fault detection from the ground fault current flowing in the neutral phase of the power receiving transformer Go out Execute. In addition, the states of the power system devices 5, 6, 9, 10, and 11 are also input to the line selection protection device 18 and processed as line selection information. The line selection protection device 18 executes the ground fault line selection process from the status information of the received power system equipment and the operation information of the power receiving ground fault detections 14 and 15, and receives the power receiving breaker 5 or the power receiving cutoff of the relevant fault line. A ground fault selection cutoff command (trip signal) is output to the device 6.
[0018]
The outline of the accident line selection processing 18 of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 1 attached to each block are the same as those in FIG. 1. The operation information of each power receiving ground fault detection 14, 15 is read in the fault line determination processing 19, and Such a line selection determination is executed.
[0019]
[Table 1]
Figure 0004018497
[0020]
On the other hand, each information of the system devices 5, 6, 9, 10, 11 is read by the in-loop detection process 20. In the case of FIG. 1, it is determined that the loop operation is being performed when all of the system devices 5, 6, 9, 10, and 11 are closed. The determination result information of the accident line determination process 19 is ANDed with the determination result information of the in-loop detection process 20 and the logical product processes 21 and 22, respectively. Alternatively, a ground fault selection cutoff command (trip signal) is output to the power receiving breaker 6.
[0021]
The accident line selection processing time chart of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 1 attached to the respective blocks are the same as those in FIG. 1. A plurality of power receiving lines are operated in parallel as necessary, such as an increase in load and uninterruptible switching of the power receiving power source. When power reception is in parallel operation, if accident (1) occurs at accident point 4 on the transmission line, ground fault current flows to the neutral points of all power receiving transformers in parallel operation at the customer power receiving end, and all power receiving lines (2) a and (2) b in which a ground fault is detected. At the same time, the power company power transmission end protection device 16 operates by the excessive current flowing out from the power company power transmission end circuit breaker 2 path of the ground fault transmission line (2), and the power transmission end circuit breaker 2 is disconnected (3). When the power transmission circuit breaker 2 is opened, the power line power transmission terminal protection device 16 of the accident line is restored (4), and the accident point 4 is connected to the sound power transmission path via the power receiving transformers 7 and 8 of the customer. As a result, the neutral ground fault current of the power receiving transformer 8 on the customer sound transmission line side disappears, but the ground fault current to the accident point 4 is present at the neutral point of the power receiving transformer 7 on the accident power transmission line side. continue.
[0022]
That is, when the power transmission end breaker 2 is opened, the power receiving ground fault detection 14 of the customer's accident side power transmission line is continued, and the power receiving ground fault detection of the sound side power transmission line is restored (5). On the other hand, the power receiving breaker of the accident side power transmission line is in a closed state, and the operation of detecting the received voltage continues. In other words, after the accidental power transmission circuit breaker of the power company is opened, the customer side system continues to detect in the loop, continues to detect the power receiving ground fault of the power receiving accident line, and the sound side power ground fault detection is restored. ▼ and continue the return state. Therefore, as described in the fault line selection process of FIG. 4, the ground fault line selection cutoff command {circle around (6)} is output after the arbitrary time td, and the customer's accident power receiving circuit breaker 5 It is opened (7), the ground fault accident transmission line is disconnected (8), the customer loop detection is restored (9), and the ground fault line selection command (10) is also restored.
[0023]
As described above, the line selection protection device 18 according to the present invention sets the ground fault fault line selection determination time limit td as small as possible (a value obtained by adding a margin to the time characteristic difference required for the power receiving ground fault detection operation process-recovery process). In this way, it is possible to select and disconnect the accident line of the next stage (second stage) timed protection following the interruption of the electric power company power transmission end accident.
[0024]
2 is a power reception protection system diagram of the second embodiment of the present invention, FIG. 4 is a schematic diagram of the ground fault line selection processing of the present invention, and FIG. 5 is a time chart of the ground fault line selection processing of the present invention. is there.
[0025]
In FIG. 2, the electric power of the consumer is supplied from a power company's power transmission facility 1 through a plurality of power transmission lines via circuit breakers 2 and 3. At the customer, a plurality of power transmission lines are stepped down to the customer bus voltage via the receiving circuit breakers 5 and 6 and the respective power receiving transformers 7 and 8 and the transformer secondary circuit breakers 9 and 10 and supplied to the load. . Also, the secondary or tertiary current of an instrument current transformer connected to each power receiving line of the consumer is input to the line selection protection device 18 to obtain the zero-phase current of each power receiving line generated from the three-phase vector. The power receiving ground fault detection 14, 15 is executed. In addition, the states of the power system devices 5, 6, 9, 10, and 11 are also input to the line selection protection device 18 and processed as line selection information. The line selection protection device 18 executes a ground fault line selection process based on the status information of the received power system equipment and the operation information of the power receiving ground fault detections 14 and 15 to receive the power receiving circuit breaker 5 or the power receiving circuit breaker of the fault line. 6 outputs a ground fault selection cutoff command (trip signal).
[0026]
The outline of the accident line selection processing 18 of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 2 attached to the respective blocks are the same as those in FIG. 2. The operation information of each power receiving ground fault detection 14, 15 is read in the fault line determination processing 19, and Such a line selection determination is executed.
[0027]
[Table 2]
Figure 0004018497
[0028]
On the other hand, each information of the system devices 5, 6, 9, 10, 11 is read by the in-loop detection process 20. In the case of FIG. 2, it is determined that the loop operation is being performed when all of the system devices 5, 6, 9, 10, and 11 are closed. The determination result information of the accident line determination process 19 is ANDed with the determination result information of the in-loop detection process 20 and the logical product processes 21 and 22, respectively. Alternatively, a ground fault selection cutoff command (trip signal) is output to the power receiving breaker 6.
[0029]
The accident line selection processing time chart of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 1 attached to the respective blocks are the same as those in FIG. 1. A plurality of power receiving lines are operated in parallel as necessary, such as an increase in load and uninterruptible switching of the power receiving power source. If accident (1) occurs at accident point 4 on the transmission line when power reception is being operated in parallel, ground fault current flows to the neutral point of all power receiving transformers in parallel operation at the customer power receiving end. A ground fault is detected on the line (2) a, (2) b. At the same time, the power company power transmission end protection device 16 is operated by an excessive current flowing out from the power company power transmission end circuit breaker 2 path of the ground fault, and (2) shuts off the power transmission end circuit breaker (3). When the power transmission circuit breaker 2 is opened, the power line power transmission terminal protection device 16 of the accident line is restored (4), and the accident point 4 is connected to the sound power transmission path via the power receiving transformers 7 and 8 of the customer. As a result, the neutral ground fault current of the receiving transformer 8 on the customer's sound transmission line side disappears, but the ground fault current to the accident point 4 is on the neutral point of the receiving transformer 7 on the accident transmission line side. Will continue.
[0030]
That is, when the power transmission end breaker 2 is opened, the power receiving ground fault detection 14 of the customer's accident side power transmission line is continued, and the power receiving ground fault detection of the sound side power transmission line is restored (5). On the other hand, the power receiving breaker of the accident side power transmission line is in a closed state, and the power receiving voltage detection continues to operate. In other words, after the accidental power transmission circuit breaker of the power company is opened, the customer side system continues to detect in the loop, continues to detect the power receiving ground fault on the power receiving accident line, and the sound side power ground fault detection returns. 5 ▼, the return state is continued. Therefore, as described in the fault line selection process of FIG. 4, the ground fault line selection cutoff command {circle around (6)} is output after the arbitrary time td, and the customer's accident power receiving breaker 5 When it is opened (7), the short-circuit accident transmission line is disconnected (8), the detection of the customer in the loop is restored (9), and the short-circuit selection command (10) is also restored.
[0031]
As described above, the line selection protection device 18 according to the present invention sets the ground fault fault line selection determination time limit td as small as possible (a value obtained by adding a margin to the time characteristic difference required for the power receiving ground fault detection operation process-recovery process). In this way, it is possible to select and disconnect the accident line of the next stage (second stage) timed protection following the interruption of the electric power company power transmission end accident.
[0032]
FIG. 3 is a power reception protection system diagram of the third embodiment of the present invention, FIG. 4 is a schematic diagram of the ground fault line selection processing of the present invention, and FIG. 5 is a time chart of the ground fault line selection processing according to the present invention.
[0033]
In FIG. 3, the customer's power is supplied from a power company's power transmission facility 1 through a plurality of power transmission lines via circuit breakers 2 and 3. At the customer, a plurality of power transmission lines are stepped down to the customer bus voltage via the receiving circuit breakers 5 and 6 and the respective power receiving transformers 7 and 8 and the transformer secondary circuit breakers 9 and 10 and supplied to the load. . Further, the secondary or tertiary voltage of the instrument transformer connected to each power receiving line of the consumer is input to the line selection protection device 18 to obtain the zero-phase voltage of each power receiving line generated from the three-phase vector, The ground fault detection 14 and 15 is executed. In addition, the states of the power system devices 5, 6, 9, 10, and 11 are also input to the line selection protection device 18 and processed as line selection information. The line selection protection device 18 executes a ground fault line selection process based on the status information of the received power system equipment and the operation information of the power receiving ground fault detections 14 and 15 to receive the power receiving circuit breaker 5 or the power receiving circuit breaker of the fault line. 6 outputs a ground fault selection cutoff command (trip signal).
[0034]
The outline of the accident line selection processing 18 of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 3 attached to the respective blocks are the same as those in FIG. 3. The operation information of each power receiving ground fault detection 14, 15 is read by the fault line determination processing 19, and Such a line selection determination is executed.
[0035]
[Table 3]
Figure 0004018497
[0036]
On the other hand, each information of the system devices 5, 6, 9, 10, 11 is read by the in-loop detection process 20. In the case of FIG. 3, it is determined that the loop operation is being performed when all of the system devices 5, 6, 9, 10, and 11 are closed. The determination result information of the accident line determination process 19 is ANDed with the determination result information of the in-loop detection process 20 and the logical product processes 21 and 22, respectively. Alternatively, a ground fault selection cutoff command (trip signal) is output to the power receiving breaker 6.
[0037]
The accident line selection processing time chart of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 3 attached to each block are the same as those in FIG. 3, and a plurality of power receiving lines are operated in parallel as necessary, such as an increase in load and uninterruptible switching of the power receiving power source. If an accident (1) occurs at the transmission line accident point 4 when the power reception is operated in parallel, the three-phase vector sum of the secondary or tertiary voltage of the instrument transformer connected to the power reception line at the consumer power reception end A zero-phase voltage is generated at the power source, and a ground fault is detected in all power receiving lines (2) a and (2) b. At the same time, the power company power transmission end protection device 16 is operated by an excessive current flowing out from the circuit breaker 2 path of the power company power transmission end of the ground fault transmission line. (2) The power transmission end circuit breaker 2 is disconnected (3). When the power transmission circuit breaker 2 is opened, the power line power transmission terminal protection device 16 of the accident line is restored (4), and the accident point 4 is connected to the sound power transmission path via the power receiving transformers 7 and 8 of the customer. As a result, the zero-phase voltage of the three-phase vector sum of the secondary or tertiary voltage of the instrument transformer connected to the power receiving line on the consumer sound transmission line side disappears, but the zero of the three-phase vector sum on the accident transmission line side disappears. The phase voltage continues.
[0038]
That is, when the power transmission end breaker 2 is opened, the power receiving ground fault detection 14 of the customer's accident side power transmission line is continued, and the power receiving ground fault detection 15 of the sound side power transmission line is restored (5). On the other hand, the power receiving breaker of the accident side power transmission line is in a closed state, and the operation of detecting the received voltage continues. In other words, after the accidental power transmission circuit breaker of the power company is opened, the customer side system continues to detect in the loop, continues to detect the power receiving ground fault on the power receiving accident line, and the sound side power ground fault detection returns. 5 ▼, the return state is continued. Therefore, as described in the fault line selection process of FIG. 4, the ground fault line selection cutoff command {circle around (6)} is output after the arbitrary time td, and the customer's accident power receiving breaker 5 It is opened (7), the ground fault accident transmission line is disconnected (8), the customer loop detection is restored (9), and the ground fault line selection command (10) is also restored.
[0039]
As described above, the line selection protection device 18 according to the present invention sets the ground fault fault line selection determination time limit td as small as possible (a value obtained by adding a margin to the time characteristic difference required for the power receiving ground fault detection operation process-recovery process). In this way, it is possible to select and disconnect the accident line of the next stage (second stage) timed protection following the interruption of the electric power company power transmission end accident.
[0040]
FIG. 6 is a schematic diagram of a short-circuit fault line selection process according to the fourth embodiment of the present invention, and FIG. 7 is a time chart of the short-circuit fault line selection process according to the present invention.
In the power reception protection system diagram of FIG. 1, if a short circuit accident occurs at 4 locations on line 1, the line selection protection device 18 uses the status information of the power reception power system equipment and the operation information of the power reception undervoltage detections 14 and 15. The selection process of the short circuit fault line is executed, and a short circuit selection cutoff command (trip signal) is output to the power receiving breaker 5 or the power receiving breaker 6 of the fault line.
[0041]
The outline of the accident line selection processing 18 of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 1 attached to the respective blocks are the same as those in FIG. 1. The operation information of each of the received power unexpected voltage detections 14 and 15 is read by the mismatch operation detection processing 19 as shown in Table 4. Executes line selection judgment.
[0042]
[Table 4]
Figure 0004018497
[0043]
On the other hand, each information of the system devices 5, 6, 9, 10, 11 is read by the in-loop detection process 20. In the case of FIG. 1, it is determined that the loop operation is being performed when all of the system devices 5, 6, 9, 10, and 11 are closed. The determination result information of the accident line determination process 19 is ANDed with the determination result information of the loop detection process 20 and the logical product processes 21 and 22, respectively. Alternatively, a short circuit selection cutoff command (trip signal) is output to the power receiving breaker 6.
[0044]
A time chart of the accident line selection process of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 1 attached to the respective blocks are the same as those in FIG. 1. A plurality of power receiving lines are operated in parallel as necessary, such as an increase in load and uninterruptible switching of the power receiving power source. If a short-circuit accident {circle around (1)} occurs at the fault point 4 on the transmission line when power reception is operated in parallel, undervoltages {circle around (2) a, {circle around (2)} b are detected on all the power reception lines at the customer receiving end, At the same time, the power company power transmission end protection device 16 operates due to an excessive current flowing out from the circuit breaker 2 path at the power company power transmission end of the accident line. (2) The power transmission end circuit breaker 2 is disconnected (3). When the power transmission end breaker 2 is opened, the power line power transmission end protection device 16 of the accident line is restored (4), and the short-circuit current flowing at the accident point 4 passes through the sound line of the power transmission end breaker 3 and the customer power receiving end breaker 5. Detour. That is, since the fault current flows through the receiving transformers 7 and 8 and most of the short-circuit impedance is occupied by the impedance of the receiving transformers 7 and 8, the sound side receiving undervoltage detection of the consumer is also restored. .
[0045]
On the other hand, the power receiving breaker of the accident side power transmission line is in a closed state, and the operation of detecting the received voltage is continued. In other words, after the accidental power transmission circuit breaker of the electric power company is opened, the customer side system continues to detect in the loop, continues to detect the power reception undervoltage on the power reception accident line, and the sound side power reception undervoltage detection returns. 5 ▼, the return state is continued. Therefore, as described in the fault line selection process of FIG. 6, the short circuit selection selection command {circle around (6)} is output after the arbitrary time td, and the customer's accident power receiving breaker 5 When it is opened (7), the short-circuit accident transmission line is disconnected (8), the detection of the customer in the loop is restored (9), and the short-circuit selection command (10) is also restored.
[0046]
As described above, the line selection protection device 18 according to the present invention establishes the short-circuit fault line selection determination time limit td as small as possible (a value obtained by adding a margin to the time characteristic difference required for the undervoltage detection operation process-recovery process). This enables the accident line selection interruption of the next stage (second stage) timed protection continuous to the electric power company transmission end accident interruption.
[0047]
【The invention's effect】
As described above, according to the present invention, the next-stage (two-stage) time-sequential protection can be performed in succession to the power company power transmission end accident interruption. Therefore, the protection device can be simplified and the installation work can be greatly reduced. Furthermore, since the main element is ground fault overcurrent detection or undervoltage detection, which is a basic single characteristic relay, adjustment tests and maintenance inspections are simplified, and skill adjustment of test adjustment and improvement in workability can be realized.
[Brief description of the drawings]
FIG. 1 is a power reception protection system diagram of a first embodiment of the present invention.
FIG. 2 is a power reception protection system diagram of a second embodiment of the present invention.
FIG. 3 is a power reception protection system diagram of a third embodiment of the present invention.
FIG. 4 is a schematic diagram of ground fault line selection processing according to the present invention.
5 is an accident line selection processing time chart of FIG. 4;
FIG. 6 is a schematic diagram of a short circuit fault line selection process according to a fourth embodiment of the present invention.
7 is an accident line selection process time chart of FIG. 6;
FIG. 8 is a conventional power reception protection system diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric power company's power transmission equipment, 2 ... No. 1 transmission circuit breaker, 3 ... No. 2 transmission circuit breaker, 4 ... No. 1 transmission line short-circuit accident point, 5 ... Customer's No. 1 power receiving breaker, 6 ... Customer's No.2 receiving circuit breaker, 7 ... No.1 receiving transformer of consumer, 8 ... No.2 receiving transformer of consumer, 9 ... Secondary circuit breaker of No.1 receiving customer, 10 ... No.2 of customer Secondary transformer circuit breaker, 11 ... Bus circuit breaker of customer, 12 ... No. 1 transmission line section protection device, 13 ... No. 2 transmission line section protection device, 14 ... No. 1 power reception undervoltage detection means of consumer, DESCRIPTION OF SYMBOLS 15 ... Consumer's No. 2 power reception undervoltage detection means, 16 ... Electric power company's No. 1 power transmission protection means, 17 ... Electric power company's No. 2 power transmission protection means, 18 ... Short circuit line selection means of the present invention, 19 ... Power failure power reception Line selection means, 20 ... power receiving loop operation state detection processing, 21 ... No. 1 line accident judgment logical product processing, 22 ... No. 2 line accident judgment Logical processing, 23 ... 1 Accident determination delay process, 24 ... 2 Accident determination delay process, 25 ... 1 No. powered cutoff output, 26 ... 2 No. receiving blocking output.

Claims (4)

受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、
前記各受電変圧器一次中性相に接続された計器用変流器の二次電流から地絡電流を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、
それぞれの受電回線及び、それぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、
前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段と、を備えたことを特徴とする事故回線選択継電装置。 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. In the fault line selection relay device for the power receiving line of the power system configured to operate the power receiving line configured as described above in parallel through a plurality of lines via the bus provided on the load side ,
A ground fault current is obtained from the secondary current of the instrument current transformer connected to the primary neutral phase of each of the power receiving transformers, and a power receiving ground fault detecting means for performing a comparison operation with an arbitrarily set value;
Receiving line detection means during loop operation for detecting the parallel operation state of a plurality of power receiving lines from the open / closed state of the system equipment such as each power receiving line and the disconnector and breaker of the bus that links each power receiving line,
The ground fault line is selected according to the mismatch duration of the power receiving ground fault detection results during loop operation and the respective power receiving ground fault detection states from the detection signals of the respective power receiving ground fault detecting means and the loop operating power receiving line detecting means. accident line selection relay device being characterized in that and a line selection processing means for. 受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、
それぞれの受電点に接続された計器用変流器の二次或いは、三次電流の三相ベクトルから生成されるそれぞれの受電回線の零相電流を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段を備えたことを特徴とする事故回線選択継電装置。 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. In the fault line selection relay device for the power receiving line of the power system configured to operate the power receiving line configured as described above in parallel through a plurality of lines via the bus provided on the load side ,
Each of the secondary current transformer for connection to the instrument the receiving point or obtains a zero-phase current of the respective power receiving lines generated from the three-phase vector of the tertiary current, performs a comparison operation with the value set arbitrarily Receiving ground fault detection means, and each power receiving line and a loop receiving power line that detects the parallel operation state of a plurality of power receiving lines from the open / closed state of the system equipment such as the disconnector and breaker of the bus that links each power receiving line The ground fault is detected according to the mismatch duration of the detected ground fault detection results during the loop operation and the detected ground fault detection state from the detection means, and the detection signals of the respective received ground fault detection means and the loop receiving power line detection means. An accident line selection relay device comprising line selection processing means for selecting an accident line. 受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、
それぞれの受電点に接続された計器用変圧器の二次或いは、三次電圧の三相ベクトルから生成されるそれぞれの受電回路の零相電圧を求め、任意に設定した値と比較演算を行う受電地絡検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電地絡検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電地絡検出結果の不一致継続時間とそれぞれの受電地絡検出状態によって地絡事故回線を選択する回線選択処理手段を備えたことを特徴とする事故回線選択継電装置。 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. In the fault line selection relay device for the power receiving line of the power system configured to operate the power receiving line configured as described above in parallel through a plurality of lines via the bus provided on the load side ,
Receiving ground that calculates the zero-phase voltage of each power receiving circuit generated from the three-phase vector of the secondary or tertiary voltage of the instrument transformer connected to each power receiving point, and compares it with an arbitrarily set value Loop detection power receiving means, loop receiving power line detection means for detecting a parallel operation state of a plurality of power receiving lines from the open / close state of system equipment such as a disconnector and a circuit breaker of a bus that links each power receiving line and each power receiving line And the ground fault fault line according to the mismatch duration of the power receiving ground fault detection result during loop operation and the respective power receiving ground fault detection states from the detection signals of the respective power receiving ground fault detecting means and the loop operating power receiving line detecting means. An accident line selection relay device comprising line selection processing means for selecting 受電線および受電変圧器を有し、前記受電線は一端を送電端遮断器を介して電源側に接続するとともに他端を受電遮断器を介して前記受電変圧器の一次側に接続し、前記受電変圧器は二次側を変圧器二次遮断器を介して負荷側に接続し、かつ、前記各受電線の事故時に保護装置を動作させて前記各送電端遮断器にトリップ指令を出力するように構成された受電回線を、負荷側に設けた母線を介して複数回線並列運用するように構成した電力系統の受電線の事故回線選択継電装置において、
それぞれの受電点に接続された計器用変圧器の二次電圧からそれぞれの受電回線の電圧値または、三相ベクトルから生成される面積を求め、任意に設定した値と比較演算を行う受電電圧検出手段と、それぞれの受電回線及びそれぞれの受電回線同士を連携する母線の断路器及び遮断器など系統機器の開閉状態から複数の受電回線の並列運転状態を検出するループ運転中受電回線検出手段と、前記それぞれの受電電圧検出手段及び前記ループ運転中受電回線検出手段の検出信号からループ運転中同士の受電電圧検出結果の不一致継続時間とそれぞれの受電電圧検出結果から短絡事故回線を選択する回線選択処理手段を備えたことを特徴とする事故回線選択継電装置。 A power receiving wire and a power receiving transformer, the power receiving wire having one end connected to the power supply side via a power transmission end breaker and the other end connected to the primary side of the power receiving transformer via a power receiving breaker, The power receiving transformer connects the secondary side to the load side via the transformer secondary circuit breaker, and outputs a trip command to each power transmission end circuit breaker by operating a protective device in the event of an accident on each power receiving line. In the fault line selection relay device for the power receiving line of the power system configured to operate the power receiving line configured as described above in parallel through a plurality of lines via the bus provided on the load side ,
Receiving voltage detection that calculates the voltage value of each power receiving line or the area generated from the three-phase vector from the secondary voltage of the instrument transformer connected to each power receiving point, and compares it with the arbitrarily set value A loop operating power receiving line detecting means for detecting a parallel operation state of a plurality of power receiving lines from the open / closed state of a system device such as a disconnector and a circuit breaker of a bus that links each power receiving line and each power receiving line; Line selection processing for selecting a short-circuit fault line from each received voltage detection result and a mismatch duration time of received voltage detection results during loop operation from detection signals of the respective received voltage detection means and the loop running power receiving line detection means An accident line selection relay device characterized by comprising means.
JP2002293723A 2002-10-07 2002-10-07 Accident line selection relay device Expired - Fee Related JP4018497B2 (en)

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