JP4519360B2 - Accident point locator - Google Patents

Description

【００３４】
ここで、ＸはＡ端子から事故点までの距離、ＶＡはＡ端子の対地電圧、ＶＢはＢ端子の対地電圧、Ｌは送電線の線路長、Ｚは線路の単位長あたりのインピーダンス値、ＩＢはＢ端子からの事故電流、Ｉｄは当該回線における全端子の電流のベクトル和、[ ]_１は正相変換値である。
【００３５】
本方式によれば、事故点の残り電圧の影響を受けない高精度な標定が可能である。
【００３６】
また、全端子について２回線分の電気量データが使用可能な場合には、（１）式に対する２回線の差分から電圧入力の誤差をさらに軽減可能な演算方式として、（２）式に示すような演算式が適用出来る。
【００３７】
【数２】

【００３８】
ここでΔは回線間の差分を示す。
【００３９】
第２の標定演算手段２４は、受信した電気量データに不足が確認された場合に、取得できなかったデータを棄却し標定演算を行う。この時に適用する標定演算方式は、例えば事故発生回線と不足データの関係によって決定するものとし、不足データが事故発生回線のデータでない場合には事故回線のみの全端子のデータを用いた標定を行い、不足データが事故発生回線のデータである場合には、データを取得できた端子の中の１端子のみの電圧、電流を用いた標定演算を行う。
【００４０】
図３は図１における第２の標定演算手段２４の処理例を示したフローチャートである。
【００４１】
先ずステップ３１において取得できなかったデータが事故発生回線のものか否かを判定する。次にステップ３２として不足データが事故発生回線のデータでない場合には、事故回線のみの全端子の取得データを用いた標定演算を行う。
【００４２】
ステップ３３では、不足データが事故発生回線のデータである場合、データを取得できた端子の中から演算の基準となる１端子を任意に選択する。この時の端子の選定は、標定精度を考慮して選択するものとし、背後に正相電源があり、かつ、端子電流における事故電流成分が大きな端子を選択することが望ましい。
【００４３】
ステップ３４においては、ステップ３３で選択された１端子のみの電圧、電流を用いて標定演算を行う。ステップ３５では、別の１端子を選択しての標定演算が必要かを選択し、必要な場合にはステップ３３に戻り、不要な場合には処理を終了する。
【００４４】
図４は４端子を有する送電系統における事故時の各端末装置からのデータ取得状況を示すもである。
【００４５】
図４において、送電線１Ｌに事故が発生し、中央処理装置２０から全端末装置に対してデータ収集を行ったが、Ｂ端の送電線２Ｌの電気量データが取得できなかった場合を考える。この場合、送電線１Ｌについては全端のデータが取得できていることから、第２の標定演算手段２４ではＡ端、Ｂ端、Ｃ端、Ｄ端の１Ｌデータのみを使用して（１）式に示したような方式による標定演算を行うことができる。この場合の演算には、健全回線（２Ｌ側）のデータを用いないことになるが、正相変換値を適用した演算方式であることから、隣回線からの誘導分の影響を抑えることができ、精度の良い標定が可能である。
【００４６】
図５も図４と同様、４端子を有する送電系統における事故時の各端末装置からのデータ取得状況を示すものである。
【００４７】
図５において、送電線２Ｌに事故が発生し、中央処理装置２０から全端末装置に対してデータ収集を行ったが、Ｃ端の電気量データが１Ｌ、２Ｌ共に取得できなかった場合を考える。この場合、事故の発生した回線２ＬについてはＡ端、Ｂ端、Ｄ端のデータを取得できていることから、この中の任意の端子、例えば、Ａ端を基準とし、インピーダンス測定方式を適用した標定演算を行う。（３）式は、Ａ端子の電圧、電流を用いて標定を行うインピーダンス形の標定演算の一例である。
【００４８】
【数３】

【００４９】
ここで、ＩＦは事故電流、＊印は共役複素成分、Ｉｍ｛ ｝は虚数部を示す。基準端子の電気量からＩＦに相当する電気量を求める手段としては、端子電流のα回路成分（αβ０法による変換量のひとつ）の変化量や、端子電流のβ回路成分（αβ０法による変換量のひとつ）の変化量を適用する方式があるが、原理については本発明では直接関係がないのでその説明を省略する。これにより、Ａ端を基準とした標定結果が得られる。
【００５０】
図６は４端子を有する送電系統の構成例を示すものである。
【００５１】
図６において、１Ｌ、２Ｌは送電線、区間１、区間２、区間３、区間４、区間５は４つの端子を分岐点Ｅおよび分岐点Ｆで区切った領域、Ｅ１、Ｅ２は電源、Ｚ１、Ｚ２は背後のインピーダンスを示すものである。説明の便宜上、送電線の区間１、区間２、区間３、区間４、区間５は同一の距離であり、単位長あたりのインピーダンスも同一であると仮定する。
【００５２】
いま、送電線２Ｌの区間３（事故点Ｘ）に事故が発生し、Ｃ端子の電気量データが送電線１Ｌ、２Ｌ共に取得できなかった場合を考える。この場合、第１の標定演算手段２３では標定を行えなえず、第２の標定演算手段２４において１端子を基準とし、インピーダンス測定方式を適用した標定演算を行う。ここで、背後インピーダンスの関係が、
Ｚ１＜Ｚ２
であったと仮定した場合、任意の１端子として、強電源となる可能性の高いＡ端子を選択し、これを基準とした標定演算を行う。しかしながら、事故発生区間が区間３である場合には、Ａ端子を基準とした標定演算の結果は分岐点以遠となり、事故点が特定できない。
【００５３】
このような場合には、データが取得できたもう一方の電源端子であるＤ端子を再度選択し、Ｄ端子を基準とした標定演算を行う。この時の標定結果は区間３内の事故点を正確に標定している。
【００５４】
次に、送電線２Ｌの区間２（事故点Ｙ）に事故が発生し、Ｂ端子とＣ端子の電気量データが１Ｌ，２Ｌ共に取得できなかった場合を考える。この場合も、第１の標定演算手段２３では標定を行えないことから、第２の標定演算手段２４において１端子を基準とし、インピーダンス測定方式を適用した標定演算を行う。
【００５５】
この時の標定基準端子は、Ａ端子またはＤ端子となるが、事故点が区間２に存在する場合には何れの端子を基準とした標定結果も分岐点以遠の結果を示すことから、このような場合には正確な事故点を標定できない。しかしながら、Ａ端子とＤ端子の２つの標定結果から、事故点の区間を特定することができる。
【００５６】
標定結果出力手段２５においては、受信すべき電気量データの全てを用いる第１の標定演算手段２３または受信すべきデータに不足が生じた場合に取得できなかったデータを棄却して標定演算を行う第２の標定演算手段２４の演算結果から、事故点の存在する区間を特定するか事故点を標定し、その結果を出力する。
【００５７】
第１の標定演算手段２３により標定結果が得られた場合には、その標定結果をそのまま出力し、第１の標定演算手段２３により標定結果が得られなかった場合には、第２の標定演算手段２４により事故発生回線のみの全端子のデータを用いた標定演算結果、または１端子を基準とした標定演算による標定演算結果を出力する。１端子を基準とした標定演算を行う場合や分岐点以遠の標定を行う場合には、標定演算結果は複数個得られることになる。これら複数の標定結果の中で、標定基準端子から分岐点までの地点を標定した結果が存在すれば、その結果を出力する。
【００５８】
しかしながら、複数の標定結果が何れも分岐点以遠を示した場合には、その結果から事故点の区間を特定する。例えば図６における送電線２Ｌの区間３（事故点Ｙ）に事故が発生し、Ｂ端子とＣ端子の電気量データが１Ｌ，２Ｌ共に取得できなかった場合を考える。
【００５９】
この時、第２の標定演算手段２４においては、前述のように１端子を基準とし、インピーダンス測定方式を適用した標定演算をＡ端子およびＤ端子を基準として行う。また、Ａ端子を基準とした標定演算結果は、区間２の１地点または区間４の１地点を示し、Ｄ端子を基準とした標定演算結果は区間２の１地点または区間５の１地点を示す。
【００６０】
標定結果出力手段２５は、このように分岐点以遠の複数の標定結果が得られた場合に、それらの結果の地点でＡＮＤ条件の成立する区間を選定し、これを事故点の存在する区間として出力する。この例の場合には、区間２がＡ端子を基準とした標定結果とＤ端子を基準とした標定結果のＡＮＤ条件の成立する区間となるため、区間２を事故点の存在する区間として出力する。
【００６１】
以上のような処理により、受信すべきデータに不足が確認された場合においても、複雑な標定の手順を踏むことなく、信頼性の高い標定結果を得ることができる。
【００６２】
図７は本発明による事故点標定装置の第２の実施の形態を示すブロック構成図で、図１と同一部分には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
【００６３】
第２の実施の形態では、図７に示すように取得データ確認手段２２により受信したデータに不足が生じていることが確認されると、端末装置より不足データを再収集するデータ再収集手段２６を設けるようにしたものである。
【００６４】
データ再収集手段２６においては、取得データ確認手段２２により受信すべき電気量データの不足を確認した場合に、電気量データが収集できなかった端末装置に対し、再度電気量データを送信するように指示を与える。例えば、図７に示した送電系統において、端末装置１０Ａの送電線１Ｌの電気量データが端末装置と中央処理装置２０との間の伝送路の異常により電気量データが収集できなかった場合には、端末装置１０Ａに対してデータ取得手段２１を介して再度送電線１Ｌの電気量データを標定演算装置２０に送信するように指示する。
【００６５】
これにより、端末装置１０Ａより送電線１Ｌの電気量データが取得できた場合には、第１の標定演算手段２３により全ての電気量データを用いた標定演算を行う。
【００６６】
ここで、データ再収集手段２６が再度データ収集を行うように指示するタイミングは、以下の２通りが考えられる。
【００６７】
ａ．所定の時間が経過した後に再収集を指示する。（自動再収集）
ｂ．任意の時刻に再収集を起動可能な構成とする。（手動再収集）
ａを選択する場合は、適用する伝送路の種別により再収集までの時刻を決定することが望ましい。ａとｂの機能を両方共に収納しておくことも有効である。
【００６８】
これにより、受信すべきデータに不足が確認された場合には、データの再収集で不足データを取得することにより、正確な標定結果を得ることができる。
【００６９】
また、上記ａ又はｂ、ａとｂの機能で複数回データの再収集を行っても、取得データ確認手段２２により各端末から取得した電気量データに不足があることが確認されると、第１の実施の形態と同様に取得できなかったデータを棄却して第２の標定演算手段２４により標定演算が行なわれる。
【００７０】
本発明による事故点標定装置の第３の実施の形態について説明するに、その構成は図１に示すブロック図と同様である。
【００７１】
第３の実施の形態では、第１の実施の形態における事故点標定装置の第２の標定演算手段２４に対して、受信した電気量データに不足が確認された場合に、事故発生回線のデータを取得できた全ての端子から、１端子のみの電圧、電流を用いた標定演算を行う機能を持たせたものである。
【００７２】
ここで、上記第２の標定演算手段２４の処理を図８に示すフローチャートにより説明する。
【００７３】
先ず、ステップ８１においては、データを取得できた端子を抽出する。ステップ８２では、ステップ８１にて抽出した端子について１端子のみの電圧、電流を用いて標定演算を行う。ステップ８３では、ステップ８１で選択した全端子について標定演算が完了したか否かを確認し、完了しない場合はステップ８２に戻り、抽出した端子全の標定演算か完了した場合は処理を終了する。
【００７４】
例えば図５に示す送電系統において、送電線２Ｌに事故が発生し、中央処理装置２０から全端末装置１０に対してデータ収集を行ったが、Ｃ端の電気量データが送電線１Ｌ、２Ｌ共に取得できなかった場合の処理を考える。この場合、事故の発生した送電線２Ｌについては、Ａ端子、Ｂ端子、Ｄ端子のデータを取得できていることから、Ａ端子、Ｂ端子、Ｄ端子それぞれを基準とし、インピーダンス測定方式による標定演算を順次行う。この時の標定演算式も（３）式に順ずるものとする。
【００７５】
その結果、３つの標定結果が得られる。これらの結果の中から、系統条件や標定値を参照しながら、以下の項目に該当する標定結果を選択することにより、信頼性の高い標定結果を得ることができる。
【００７６】
・標定結果が標定基準端子からの最初の分岐点よりも近い
・標定基準端子に正相電源がある
これにより、受信すべきデータに不足が確認された場合においても、複雑な標定手順を踏むことなく、信頼性の高い標定結果を得ることができる。
【００７７】
本発明による事故点標定装置の第４の実施の形態について説明するに、その構成は図１に示すブロック図と同様である。
【００７８】
第４の実施の形態では、第１の実施の形態における事故点標定装置の第２の標定演算手段２４に対して、受信した電気量データに不足が確認された場合に、１端子のデータのみを使用した標定演算をデータが取得できた端子全てについて行い、分岐点以遠の標定については、データを取得できた端子の電気量データから分岐点の電圧、電流を算出し、データ未取得端子までの標定を行う機能を持たせたものである。
【００７９】
ここで、上記第２の標定演算手段２４の処理を図９に示すフローチャートにより説明する。
【００８０】
先ず、ステップ９１では取得できなかったデータが事故発生回線のものか否かを判定する。このステップ９１により不足データが事故発生回線でないと判定されると、ステップ９２にて事故回線のみの全端子の取得データを用いた標定演算を行う。
【００８１】
また、上記ステップ９１により不足データが事故発生回線であると判定されると、データを取得できた端子の中から演算の基準となる１端子を任意に選択する。この時の端子に選定は、標定精度を考慮して選択するものとし、背後に正相電源があり、かつ、端子電流における事故電流成分が大きな端子を選択することが望ましい。
【００８２】
次にステップ９４においては、ステップ９３で選択された１端子のみの電圧、電流を用いて標定演算を行い、ステップ９５にて標定結果が標定基準点から最初の分岐点よりも近いか否かを判定する。このステップ９５にて標定結果が標定基準点から最初の分岐点よりも近いと判定されると、ステップ９６に進んで、演算した一つの結果をセットする。
【００８３】
また、上記ステップ９５にて標定結果が最初の分岐点以遠であると判定されると、ステップ９５１に進み、標定基準端子と分岐点を構成する他の端子のデータが取得できているかを確認する。
【００８４】
このステップ９５１で他の端子のデータが取得できていると判定されると、ステップ９５２にて分岐点の電圧、電流データを算出した後、ステップ９５３に進む。このステップ９５３ではステップ９５２にて電圧、電流を算出した分岐点を基準として、次区間の標定演算を行い、再度ステップ９５に戻って判定を行う。
【００８５】
上記ステップ９５１で他の端子のデータが取得できていないと判定されると、ステップ９７へ進む。このステップ９７では、データを取得できなかった端子以外に標定を実施していない端子が無いかを確認し、標定を実施していない端子があればステップ９３に戻ってデータ取得端子から１端子を選択する。また、ステップ９７にてデータを取得できなかった端子以外に標定を実施していない端子が無いと判定されるとステップ９８に進み、それまでに算出した１つ以上の標定結果をセットし処理を終了する。
【００８６】
以上の処理によれば、受信すべきデータに不足が確認された場合でも、複雑な標定手順を踏むことなく、正確な標定結果を得ることができる。
【００８７】
本発明による事故点標定装置の第５の実施の形態について説明するに、その構成は図１に示すブロック図と同様である。
【００８８】
第５の実施の形態では、第１の実施の形態における事故点標定装置の第２の標定演算手段２４に対して、受信した電気量データに不足が確認された場合に、データを取得できた端子の中から、系統における端子の条件とデータ取得状態をもとに、標定基準端として最適な一端子を決定し、その基準端子のデータのみを使用した標定演算を行う機能を持たせたものである。
【００８９】
ここで、上記第２の標定演算手段２４の処理を図１０に示すフローチャートにより説明する。
【００９０】
先ず、ステップ１０１にてデータを取得できた端子を抽出し、ステップ１０２にてステップ１０１で抽出した端子の中から１端子を選択した後、ステップ１０３に進む。
【００９１】
ステップ１０３ではその端子が系統上で背後に正相電源が存在するか否かを確認し、電源がある場合にはステップ１０４にてその端子のみのデータを用いた標定演算を行ってステップ１０５に進み、電源が無い場合にはステップ１０２に戻って別の端子を選択する。
【００９２】
ステップ１０５では別の端子を基準とした演算を必要とするか否かを確認し、必要な場合はステップ１０２に戻り、必要無い場合は処理を終了する。
【００９３】
上記ステップ１０２において、別の端子を選択する判断する目安として、以下の項目に該当するかどうかを確認すると良い。
【００９４】
・その系統での強電源端子が別にある
・標定結果が分岐点以遠であった
これにより、受信すべきデータに不足が確認された場合においても、複雑な標定の手順を踏むことなく、信頼性の高い標定結果を得ることができる。
【００９５】
本発明による事故点標定装置の第６の実施の形態について説明するに、その構成は図１に示すブロック図と同様である。
【００９６】
第６の実施の形態では、第１の実施の形態における事故点標定装置の第２の標定演算手段２４に対して、受信した電気量データに不足が確認された場合に、その端子の送電線の遮断器が開放しているものと仮定し、当該端子の電流データをゼロと見なして他の端子のデータのみによる標定演算を行う機能を持たせたものである。
【００９７】
ここで、上記第２の標定演算手段２４の処理を図１１に示すフローチャートにより説明する。
【００９８】
先ず、ステップ１１１において、データを取得できなかった端子を抽出してステップ１１２に進む。このステップ１１２では、その端子の遮断器が開放しているものと見なし、その端子以外の全データを使用した標定演算を行う。この時の標定演算方式は前述の（１）式または（２）式に相当する全端のデータを適用した演算となるが、データを取得できなかった端子については遮断器開放状態と見なすため、標定の基準端子とはならない。
【００９９】
上記ステップ１１２で標定演算が行われると、ステップ１１３ではその標定結果が分岐点の近傍か否かを判定し、近傍である場合にはステップ１１４にて分岐点の電圧、電流を算出した後に分岐点以遠の標定を行う。
【０１００】
また、ステップ１１３にてステップ１１２の標定演算結果が分岐点近傍でないと判定されると、ステップ１１２の標定演算結果をそのまま出力する。
【０１０１】
図１２は４端子を有する送電線における事故時の各端末装置からのデータ取得状況を示している。例えば図１２に示す送電線において、区間２の送電線１Ｌに事故が発生し、中央処理装置から全端末装置に対してデータ収集を行ったが、Ｄ端の電気量データが送電線１Ｌ、２Ｌ共に取得できなかった場合を考える。この場合、Ａ端子、Ｂ端子、Ｃ端子についてはデータを取得できていることから、Ａ端データとＢ端データを基準とした標定演算、Ａ端データとＣ端データを基準とした標定演算を行うことになる。
【０１０２】
先ず、Ａ端データとＢ端データを基準とした標定演算により分岐点Ｅが結果として導かれ、次にＡ端データとＣ端データを基準とした標定演算により、区間２の事故点が正しく標定可能となる。
【０１０３】
これにより、受信すべきデータに不足が確認された場合においても、複雑な標定の手順を踏むことなく、信頼性の高い標定結果を得ることができる。
【０１０４】
なお、上記各実施の形態では、４端子の送電系統に本発明を適用する場合について述べたが、多端子、すなわち２端子以上の送電系統に適用実施しても、前述同様の作用効果を得ることができるものである。
【０１０５】
【発明の効果】
以上述べたように本発明によれば、データ収集用端末の不良や伝送路の異常の理由から一部のデータが収集できなかった場合でも、精度の良い標定結果が得られる事故点標定装置を提供できる。
【図面の簡単な説明】
【図１】本発明による事故点標定装置の第１の実施の形態を示すブロック構成図。
【図２】同実施の形態の作用説明に用いられる４端子を有する送電線における遮断器の状態を示す系統図。
【図３】同実施の形態における第２の標定演算手段の処理例を示すフローチャート。
【図４】同実施の形態の作用説明に用いられる４端子を有する送電線における事故時の各端末装置からのデータ取得状況の一例を示す系統図。
【図５】同じく４端子を有する送電線における事故時の各端末装置からのデータ取得状況の他の例を示す系統図。
【図６】同実施の形態における第２の標定演算手段の処理を説明するための系統図。
【図７】本発明による事故点標定装置の第２の実施の形態を示すブロック構成図。
【図８】本発明の第３の実施の形態における第２の標定演算手段の処理を示すフローチャート。
【図９】本発明の第４の実施の形態における第２の標定演算手段の処理を示すフローチャート。
【図１０】本発明の第５の実施の形態における第２の標定演算手段の処理を示すフローチャート。
【図１１】本発明の第６の実施の形態における第２の標定演算手段の処理を示すフローチャート。
【図１２】同実施の形態の作用説明に用いられる４端子を有する送電線における事故時の各端末装置からのデータ取得状況の一例を示す系統図。
【符号の説明】
Ａ，Ｂ，Ｃ，Ｄ…端子
Ｂ_A，Ｂ_B，Ｂ_C，Ｂ_D…母線
１Ｌ,２Ｌ…送電線
ＣＴ１１Ａ，ＣＴ１２Ａ，ＣＴ１１Ｂ，ＣＴ１２Ｂ，ＣＴ１１Ｃ，
ＣＴ１２Ｃ,ＣＴ１１Ｄ,ＣＴ１２Ｄ…変流器
ＰＴ１３Ａ，ＰＴ１３Ｂ，ＰＴ１３Ｃ，ＰＴ１３Ｄ…変圧器
ＣＢ１１Ａ，ＣＢ１２Ｂ，ＣＢ１１Ｂ，ＣＢ１２Ｂ，ＣＢ１１Ｃ，ＣＢ１２Ｃ，ＣＢ１１Ｄ，ＣＢ１２Ｄ…変流器
１０Ａ，１０Ｂ，１０Ｃ，１０Ｄ…端末装置
Ｅ１，Ｅ２…電源
Ｚ１，Ｚ２…送電線の背後インピーダンス
１１…データ入力手段
１２…データ記憶手段
１３…データ伝送手段
２０…中央処理装置
２１…データ取得手段
２２…取得データ確認手段
２３…第１の標定演算手段
２４…第２の標定演算手段
２５…標定結果出力手段
２６…データ再収集手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accident point locating apparatus that extracts an amount of electricity from each terminal of a power transmission system having a multi-terminal multi-line, and locates an accident point when an accident occurs on the transmission line.
[0002]
[Prior art]
Conventionally, in an accident point locating device for locating an accident point of a transmission system composed of multi-terminal and multi-line transmission lines, the voltage and current of each line is collected from each terminal of the transmission line to the terminal device as electric quantity data, These electrical quantity data are transmitted to the central processing unit, and the electrical quantity data is processed by the central processing unit to obtain the distance from the reference terminal to the accident point.
[0003]
By the way, in such an accident point locating device, if the terminal device of a certain terminal is defective at the time of an accident in the power transmission system, or if there is an abnormality in the transmission line between the certain terminal device and the central processing unit, some data is May not be collected.
[0004]
Therefore, in such a case, it is necessary to give up the implementation of the orientation as a data collection failure, and this does not achieve the original purpose of the accident point location device.
[0005]
Therefore, recently, even if there is a terminal from which current data cannot be taken in as disclosed in Japanese Patent Laid-Open No. 5-142284, the current of a terminal not yet acquired data is predicted by correction calculation using the current data of other terminals. In addition, it is considered to perform orientation calculation using current data of all terminals.
[0006]
[Problems to be solved by the invention]
However, in order to predict the current of the terminal that has not yet acquired data using current data of other terminals as described above, complicated correction calculation must be performed. There is a problem.
[0007]
The present invention has been made to solve the above problems, and even when electric quantity data cannot be obtained from some terminals, it is possible to obtain an accurate orientation result without performing complicated correction calculation. The purpose is to provide a possible accident location system.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention constitutes an accident point locating device by the following means.
[0009]
  The invention corresponding to claim 1 is a terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line; In the accident point locating device comprising the central processing unit that collects the electric quantity data transmitted from the terminal device and uses these electric quantity data to locate the accident point at the time of the transmission line accident, each terminal device is Data input means for taking in the amount of electricity from the system via an input converter and converting it into digital data, data storage means for storing data input from the data input means when an accident occurs, and data stored in the data storage means Data for acquiring the electrical quantity data at the time of an accident transmitted from each of the terminal devices. With regard to the electricity quantity data obtained from each terminal device, the obtaining data confirmation means for confirming whether or not all the data to be obtained are available, and all the electricity quantity data can be obtained by the obtained data confirmation means. If it confirms that, using all the data acquired from each said terminal device, the 1st location calculation means which performs the fault point location of a power transmission line, and the electric quantity data acquired from each terminal device by the said acquisition data confirmation means Confirm that there is a shortage of data, and reject the data that could not be acquired.Executes the orientation calculation using only the data of 1 terminal for all terminals for which data was acquired.A second orientation calculation means; and an orientation result output means for specifying an accident point or a section where the accident point exists from the orientation result of the first orientation calculation means or the second orientation calculation means.
[0010]
  According to the accident location system with the above configuration,As the second orientation calculation means of the central processing unit,Even if there is a shortage in the amount of electricity data acquired from each terminal device of the multi-terminal power transmission system, the data that could not be acquired is rejected.Even if it is not possible to acquire the electrical quantity data from some terminal devices in a multi-terminal power transmission system by performing the orientation calculation using only the data of one terminal for all the terminals for which the data has been acquired, Accident section can be specified.
[0011]
  Claim 4The invention corresponding to the above is a terminal device that is installed at each terminal of a power transmission system in which a plurality of terminals of two or more terminals are connected by a plurality of power transmission lines and obtains electric quantity data from each line, and each terminal device In the accident point locating device comprising the central processing unit that collects the transmitted electrical quantity data and uses these electrical quantity data to locate the accident point at the time of the transmission line accident, each terminal device is Data input means for taking in an electric quantity via an input converter and converting it into digital data, data storage means for storing data inputted from the data input means at the time of an accident, and electric quantity stored in the data storage means Data transmission means for transmitting data to the central processing unit, wherein the central processing unit acquires data on the amount of electricity transmitted at the time of an accident transmitted from each terminal device In regard to the electricity quantity data obtained from each terminal device, the acquisition data confirmation means for confirming whether or not all the data to be obtained are available, and the electricity quantity data obtained from each terminal by the obtained data confirmation means are insufficient. When confirming that there is a data re-collection means for collecting data for the terminal device that could not obtain the electric quantity data through the data acquisition means, and all the electric quantity data could be obtained by the obtained data confirmation means If it confirms that, even if data is collected by the data recollection means, the first orientation calculation means for performing fault location of the transmission line using all the data obtained from each of the terminal devices, the acquired data confirmation means When confirming that there is a shortage in the amount of electricity data acquired from each terminal, reject the data that could not be acquired,Perform orientation calculation using only data from one terminal for all terminals that have acquired dataA second orientation calculation means; and an orientation result output means for specifying an accident point or a section where the accident point exists from the orientation result of the first orientation calculation means or the second orientation calculation means.
[0012]
According to the accident point locating device having the above configuration, when there is a shortage in the electric quantity data acquired from each terminal device of the multi-terminal power transmission system, the data is acquired by recollection. Even when the electrical quantity data from some terminal devices cannot be acquired temporarily due to a defect or the like, an accurate orientation result can be obtained.
[0014]
According to the accident point locating device having the above configuration, when there is a deficiency in the electric quantity data acquired from each terminal device of the multi-terminal power transmission system, the terminal that has been able to acquire the location calculation using only one terminal data. By performing all the steps, it is possible to specify an accident point or an accident section even when electric quantity data from some terminal devices cannot be acquired in the multi-terminal power transmission system.
[0015]
  Of the present inventionClaim 2 or claim 5Invention corresponding toSaidSecond orientation calculation means of central processing unitAsWhen confirming that there is a deficiency in the electric quantity data acquired from each terminal device by the acquisition data confirmation means,Reject the data that could not be acquired,Perform orientation calculation using only data from one terminal for all terminals for which data was obtained. For orientations beyond the branch point, calculate the voltage and current at the branch point from the electrical quantity data for the terminal from which the data was obtained, and use the data Provide a function to perform orientation up to unacquired terminals.
[0016]
According to the accident point locating device having the above configuration, when there is a deficiency in the electric quantity data acquired from each terminal device of the multi-terminal power transmission system, the terminal that has been able to acquire the location calculation using only one terminal data. For all orientations, and for orientation beyond the branch point, calculate the voltage and current at the branch point from the electrical data of the terminal from which data was acquired, and perform orientation to the terminal where data is not acquired. Even when electric quantity data from some terminal devices cannot be obtained, accurate orientation results can be obtained in all sections.
[0017]
  Claim 3 or claim 6Invention corresponding toSaidSecond orientation calculation means of central processing unitAsWhen confirming that there is a deficiency in the electric quantity data acquired from each terminal device by the acquisition data confirmation means,Reject the data that could not be acquired,Based on the terminal conditions and data acquisition status in the system, the most suitable terminal is determined as the standard reference end, and the standard calculation is performed using only the data from the standard terminal. Give function.
[0018]
According to the accident point locating device having the above-described configuration, when shortage is confirmed in the electric quantity data acquired from each terminal device of the multi-terminal power transmission system, the terminal condition in the system is determined from the terminals from which the data can be acquired. Based on the data acquisition status, the most suitable terminal is determined as the standard reference terminal, and the standard calculation using only the data of the standard terminal is performed, so that the amount of electricity from some terminal devices in the multi-terminal power transmission system Even when data cannot be acquired, the accident point or accident section can be identified.
[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 in which an accident point locating device according to the present invention is applied to a power transmission system composed of four terminals and two lines.
[0023]
In FIG. 1, 1L and 2L are buses B at terminals A, B, C, D_A, B_B, B_C, B_DTwo transmission lines CT11A, CT12A, CT11B, CT12B, CT11C, CT12C, CT11D, and CT12D flow through the transmission lines 1L and 2L of each line on each terminal side. Current transformers PT13A, PT13B, PT13C, and PT13D that detect currents are buses B of terminals A, B, C, and D._A, B_B, B_C, B_DIt is a transformer that detects the voltage of.
[0024]
On the other hand, 10A, 10B, 10C, and 10D are terminal devices provided corresponding to the terminals A, B, C, and D. These terminal devices 10A, 10B, 10C, and 10D correspond to the transmission lines 1L, The current input from the current transformer provided in 2L and the terminal voltage from the transformer, the data input means 11 for performing digital conversion after sampling at a predetermined interval, and the data input means 11 taken in at the time of the occurrence of a system fault Data storage means 12 for storing electric quantity data in a predetermined period before and after the occurrence of the accident in a memory, and electric quantity data stored in the data storage means 12 at the time of a data request from the central processing unit 20 to be described later in detail And data transmission means 13 for transmission to the central processing unit 20 via 100.
[0025]
The central processing unit 20 includes a data acquisition unit 21 that acquires electric quantity data transmitted from each terminal device 10A, 10B, 10C, and 10D via a predetermined transmission medium 100, and data acquired by the data acquisition unit 21. The acquired data confirmation means 22 for confirming whether or not all requested electric quantity data are included in the data, and the acquisition data confirmation means 22 confirm that all the electric quantity data to be received have been obtained. And the first orientation calculation means 23 that performs the optimum orientation calculation using all the acquired electric quantity data, and the acquired data confirmation means 22 confirm that the data received is insufficient. The second orientation calculation means 24 that rejects the data that could not be performed and performs the orientation calculation, and the first orientation calculation means 23 that uses all the data, or could not be acquired From the calculation result of the second standard calculation means 25 which rejects the data and performs the standard calculation, the section including the accident point is specified, or the standard result output means 26 which standardizes the accident point and outputs the result. .
[0026]
Here, the data storage means 12 of the terminal device 10 stores digital conversion data of current and voltage flowing in the power transmission line taken into the data input means 11 via the current transformer and the transformer when an accident occurs. In this case, the detection of the occurrence of an accident is performed based on the absolute amount and change amount of the current and voltage taken in, but the specific detection method is not directly related to the gist of the present invention. Omitted. In addition, data should be stored within the range necessary for orientation calculation. For example, by storing data from 10 cycles before the occurrence of an accident to the time of detection of an accident return, data before the accident required for orientation calculation is saved. And data on accidents can be secured.
[0027]
Further, in response to a request from the central processing unit 20, the data transmission means 13 of the terminal device 10 cuts out the electrical data at the same time stored in the data storage means 12 at the time of the accident, for example, a dedicated network line or telephone The data is transmitted to the central processing unit 20 via a transmission medium 100 such as a line.
[0028]
On the other hand, in the central processing unit 20, the data acquisition means 21 requests all terminal devices connected to the power transmission line for data at the time of transmission line accident occurrence, and then sent from the data transmission means 13 of each terminal device. Electric quantity data at the time of the accident is acquired via the transmission medium 100.
[0029]
Further, the acquisition data confirmation unit 22 confirms whether there is a deficiency in the electric quantity data from each terminal device acquired by the data acquisition unit 21. At this time, it is considered not to collect the electrical quantity data of the line of the terminal in which the circuit breaker is open.
[0030]
FIG. 2 shows an example of the state of the circuit breaker of each terminal in a power transmission system having four terminals. 1L and 2L are power transmission lines CB11, CB12, CB21, CB22, CB31, which are connected to each other by two lines. , CB32, CB41, and CB42 are circuit breakers provided on the power transmission lines on the respective terminal sides.
[0031]
As an example, when considering the case where the circuit breakers CB22 and CB32 of the power transmission line 2L are in an open state, the electric quantity data to be received are A end 1L, A end 2L, B end 1L, C end 1L, D end 1L, It becomes the electric quantity data of the D end 2L. Only when it is confirmed that there is no shortage in these electric quantity data, the acquired data confirmation unit 22 permits the first orientation calculation unit 23 to perform orientation calculation using all the acquired data.
[0032]
The first orientation calculation means 23 performs orientation calculation using all the electrical quantity data only when acquisition of all the electrical quantity data to be received by the acquisition data confirmation means 22 is confirmed. Expression (1) is an example of an arithmetic expression for performing orientation using the electric quantity data of all terminals.
[0033]
[Expression 1]

[0034]
Here, X is the distance from the A terminal to the accident point, VA is the ground voltage of the A terminal, VB is the ground voltage of the B terminal, L is the line length of the transmission line, Z is the impedance value per unit length of the line, IB Is the fault current from the B terminal, Id is the vector sum of the currents of all terminals in the line, []₁Is a normal phase conversion value.
[0035]
According to this method, high-accuracy orientation that is not affected by the remaining voltage at the accident point is possible.
[0036]
Further, when the electric quantity data for two lines can be used for all terminals, the calculation method that can further reduce the voltage input error from the difference of the two lines with respect to the expression (1) is shown in the expression (2). Various arithmetic expressions can be applied.
[0037]
[Expression 2]

[0038]
Here, Δ indicates a difference between lines.
[0039]
When the received electricity quantity data is confirmed to be insufficient, the second orientation calculation means 24 rejects the data that could not be acquired and performs the orientation calculation. The orientation calculation method applied at this time is determined based on, for example, the relationship between the accident occurrence line and insufficient data. If the shortage data is not the data of the accident occurrence line, the orientation using the data of all terminals of the accident line only is performed. If the deficient data is data of the accident occurrence line, the orientation calculation using the voltage and current of only one of the terminals from which the data has been acquired is performed.
[0040]
FIG. 3 is a flowchart showing a processing example of the second orientation calculation means 24 in FIG.
[0041]
First, in step 31, it is determined whether or not the data that could not be acquired is for the accident occurrence line. Next, when the insufficient data is not the data of the accident occurrence line as step 32, the orientation calculation is performed using the acquired data of all terminals of only the accident line.
[0042]
In step 33, if the deficient data is data of the accident occurrence line, one terminal as a calculation reference is arbitrarily selected from the terminals from which the data can be acquired. The selection of the terminal at this time is performed in consideration of the positioning accuracy, and it is desirable to select a terminal having a positive phase power source behind it and having a large fault current component in the terminal current.
[0043]
In step 34, orientation calculation is performed using the voltage and current of only one terminal selected in step 33. In step 35, it is selected whether or not the orientation calculation is required by selecting another terminal. If necessary, the process returns to step 33, and if not necessary, the process is terminated.
[0044]
FIG. 4 shows a data acquisition situation from each terminal device at the time of an accident in a power transmission system having four terminals.
[0045]
In FIG. 4, a case where an accident occurs in the power transmission line 1L and data collection is performed from the central processing unit 20 to all terminal devices, but a case where the electric quantity data of the B-end power transmission line 2L cannot be acquired is considered. In this case, since the data of all ends can be acquired for the transmission line 1L, the second orientation calculation means 24 uses only the 1L data of the A end, the B end, the C end, and the D end (1). The orientation calculation can be performed by the method shown in the equation. In this case, the data on the sound line (2L side) is not used for the calculation, but since the calculation method applies the positive phase conversion value, the influence of the induction from the adjacent line can be suppressed. Highly accurate orientation is possible.
[0046]
FIG. 5 also shows the data acquisition status from each terminal device at the time of an accident in a power transmission system having four terminals, as in FIG.
[0047]
In FIG. 5, a case where an accident occurs in the transmission line 2L and data collection is performed from the central processing unit 20 to all the terminal devices, but the case where the C-end electric quantity data cannot be obtained for both 1L and 2L is considered. In this case, since the data of the A-end, B-end, and D-end can be acquired for the line 2L where the accident occurred, the impedance measurement method was applied with reference to any of these terminals, for example, the A-end. Perform orientation calculation. Equation (3) is an example of an impedance type orientation calculation that performs orientation using the voltage and current at the A terminal.
[0048]
[Equation 3]

[0049]
Here, IF indicates an accident current, * indicates a conjugate complex component, and Im {} indicates an imaginary part. Means for obtaining the amount of electricity corresponding to IF from the amount of electricity at the reference terminal include the amount of change in the α circuit component of the terminal current (one of the amounts converted by the αβ0 method) and the β circuit component of the terminal current (the amount of conversion by the αβ0 method). However, the principle is not directly related in the present invention, and the description thereof is omitted. Thereby, the orientation result on the basis of the A end is obtained.
[0050]
FIG. 6 shows a configuration example of a power transmission system having four terminals.
[0051]
In FIG. 6, 1L and 2L are power transmission lines, section 1, section 2, section 3, section 4 and section 5 are areas in which four terminals are separated by branch point E and branch point F, E1 and E2 are power supplies, Z1, Z2 indicates the impedance of the back. For convenience of explanation, it is assumed that section 1, section 2, section 3, section 4, and section 5 of the transmission line have the same distance, and the impedance per unit length is also the same.
[0052]
Consider a case where an accident occurs in section 3 (accident point X) of the transmission line 2L and the electric quantity data at the C terminal cannot be acquired for both the transmission lines 1L and 2L. In this case, the first orientation calculation means 23 cannot perform orientation, and the second orientation calculation means 24 performs orientation calculation using the impedance measurement method with one terminal as a reference. Here, the relationship of the back impedance is
Z1 <Z2
If it is assumed that the A terminal is selected, an A terminal that is likely to be a strong power source is selected as an arbitrary terminal, and an orientation calculation is performed based on the selected A terminal. However, when the accident occurrence section is section 3, the result of the orientation calculation with reference to the A terminal is beyond the branch point, and the accident point cannot be specified.
[0053]
In such a case, the D terminal which is the other power supply terminal from which data has been acquired is selected again, and the orientation calculation is performed with reference to the D terminal. The orientation result at this time accurately locates the accident point in the section 3.
[0054]
Next, consider a case where an accident occurs in section 2 (accident point Y) of the transmission line 2L, and the electric quantity data of the B terminal and the C terminal cannot be acquired for both 1L and 2L. Also in this case, since the first orientation calculation means 23 cannot perform orientation, the second orientation calculation means 24 performs orientation calculation using the impedance measurement method with one terminal as a reference.
[0055]
The standard reference terminal at this time is the A terminal or the D terminal, but when the accident point exists in the section 2, the standardization result based on any terminal shows the result beyond the branch point. In this case, it is impossible to determine the exact accident point. However, the section of the accident point can be specified from the two orientation results of the A terminal and the D terminal.
[0056]
The orientation result output means 25 performs the orientation calculation by rejecting the first orientation calculation means 23 using all of the electric quantity data to be received or the data that could not be acquired when the data to be received is insufficient. From the calculation result of the second orientation calculation means 24, the section where the accident point exists is specified or the accident point is standardized, and the result is output.
[0057]
When the orientation result is obtained by the first orientation computing means 23, the orientation result is output as it is, and when the orientation result is not obtained by the first orientation computing means 23, the second orientation computation is performed. The means 24 outputs the result of the orientation calculation using the data of all the terminals of the accident occurrence line alone or the orientation calculation result by the orientation calculation based on one terminal. In the case of performing an orientation calculation based on one terminal or an orientation beyond the branch point, a plurality of orientation calculation results are obtained. If there is a result of locating a point from the orientation reference terminal to the branch point among the plurality of orientation results, the result is output.
[0058]
However, when all of the plurality of orientation results indicate that the distance is beyond the branch point, the section of the accident point is specified from the result. For example, let us consider a case where an accident occurs in the section 3 (accident point Y) of the power transmission line 2L in FIG. 6 and the electric quantity data of the B terminal and the C terminal cannot be acquired for both 1L and 2L.
[0059]
At this time, the second orientation calculation means 24 performs the orientation calculation using the impedance measurement method with reference to the A terminal and the D terminal as described above with reference to one terminal. Also, the orientation calculation result based on the A terminal indicates one point in the section 2 or one point in the section 4, and the orientation calculation result based on the D terminal indicates one point in the section 2 or one point in the section 5. .
[0060]
The orientation result output means 25, when a plurality of orientation results beyond the branch point are obtained in this way, selects the section where the AND condition is satisfied at the point of those results, and sets this as the section where the accident point exists. Output. In the case of this example, since section 2 is a section where the AND condition of the orientation result based on the A terminal and the orientation result based on the D terminal is satisfied, the section 2 is output as the section where the accident point exists. .
[0061]
Even if it is confirmed that the data to be received is insufficient by the processing as described above, a highly reliable orientation result can be obtained without going through a complicated orientation procedure.
[0062]
FIG. 7 is a block diagram showing a second embodiment of the accident point locating device according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.
[0063]
In the second embodiment, as shown in FIG. 7, when the acquired data confirmation unit 22 confirms that the received data is deficient, the data recollection unit 26 recollects the deficient data from the terminal device. Is provided.
[0064]
In the data re-collection means 26, when it is confirmed by the acquired data confirmation means 22 that there is a shortage of electricity data to be received, the electricity data is transmitted again to the terminal device that has not been able to collect electricity data. Give instructions. For example, in the power transmission system shown in FIG. 7, when the electrical quantity data of the transmission line 1 </ b> L of the terminal apparatus 10 </ b> A cannot be collected due to an abnormality in the transmission path between the terminal apparatus and the central processing unit 20. The terminal device 10A is instructed to transmit the electrical quantity data of the power transmission line 1L to the orientation calculation device 20 again via the data acquisition unit 21.
[0065]
Thereby, when the electrical quantity data of the transmission line 1L can be acquired from the terminal device 10A, the first orientation calculation means 23 performs orientation calculation using all the electrical quantity data.
[0066]
Here, there are two possible timings for instructing the data re-collecting means 26 to collect data again.
[0067]
a. Re-collection is instructed after a predetermined time has elapsed. (Automatic recollection)
b. The recollection can be started at an arbitrary time. (Manual recollection)
When selecting a, it is desirable to determine the time until recollection according to the type of transmission line to be applied. It is also effective to store both functions a and b.
[0068]
Thereby, when it is confirmed that the data to be received is deficient, an accurate orientation result can be obtained by acquiring the deficient data by data recollection.
[0069]
In addition, even if data is re-collected a plurality of times using the functions a or b, a and b, the acquired data confirmation means 22 confirms that the amount of electricity acquired from each terminal is insufficient. Similarly to the first embodiment, the data that could not be acquired is rejected, and the second calculation operation unit 24 performs the calculation.
[0070]
The third embodiment of the accident point locating device according to the present invention will be described. The configuration thereof is the same as the block diagram shown in FIG.
[0071]
In the third embodiment, when the shortage is confirmed in the received electric quantity data with respect to the second orientation calculation means 24 of the accident point location device in the first embodiment, data on the accident occurrence line is obtained. Is provided with a function of performing orientation calculation using the voltage and current of only one terminal from all the terminals that have obtained the above.
[0072]
Here, the processing of the second orientation calculation means 24 will be described with reference to the flowchart shown in FIG.
[0073]
First, in step 81, a terminal from which data has been acquired is extracted. In step 82, the orientation calculation is performed using the voltage and current of only one terminal for the terminals extracted in step 81. In step 83, it is confirmed whether or not the orientation calculation has been completed for all the terminals selected in step 81. If not completed, the process returns to step 82, and if the orientation calculation for all the extracted terminals has been completed, the process is terminated.
[0074]
For example, in the power transmission system shown in FIG. 5, an accident occurred in the power transmission line 2L, and data was collected from the central processing unit 20 to all the terminal devices 10. However, the electrical quantity data at the C end is in both the power transmission lines 1L and 2L. Consider the process in the case of failure to acquire. In this case, since the data of the A terminal, the B terminal, and the D terminal can be acquired for the transmission line 2L in which the accident occurred, the orientation calculation by the impedance measurement method with the A terminal, the B terminal, and the D terminal as references. Are performed sequentially. The orientation calculation formula at this time also follows formula (3).
[0075]
As a result, three orientation results are obtained. From these results, it is possible to obtain a highly reliable orientation result by selecting an orientation result corresponding to the following items while referring to system conditions and orientation values.
[0076]
・ The orientation result is closer to the first branch point from the orientation reference terminal
・ Positive phase terminal has positive phase power supply
Thereby, even when it is confirmed that the data to be received is insufficient, a highly reliable orientation result can be obtained without going through a complicated orientation procedure.
[0077]
The fourth embodiment of the accident point locating device according to the present invention will be described. The configuration is the same as the block diagram shown in FIG.
[0078]
In the fourth embodiment, when it is confirmed that the received electricity quantity data is insufficient with respect to the second orientation calculation means 24 of the accident point location device in the first embodiment, only the data of one terminal is used. For all the terminals where data can be acquired, calculate the voltage and current at the branch point from the electrical quantity data of the terminal where data can be acquired, and to the terminal where data has not been acquired. It has a function to perform orientation.
[0079]
Here, the processing of the second orientation calculation means 24 will be described with reference to the flowchart shown in FIG.
[0080]
First, it is determined whether or not the data that could not be acquired in step 91 belongs to the accident occurrence line. If it is determined in step 91 that the deficient data is not an accident occurrence line, in step 92, an orientation calculation is performed using the acquired data of all terminals of only the accident line.
[0081]
If it is determined in step 91 that the insufficient data is an accident occurrence line, one terminal serving as a calculation reference is arbitrarily selected from the terminals from which the data can be acquired. Selection of the terminal at this time is made in consideration of the positioning accuracy, and it is desirable to select a terminal having a positive phase power source behind and having a large accident current component in the terminal current.
[0082]
Next, in step 94, the orientation calculation is performed using the voltage and current of only one terminal selected in step 93. In step 95, it is determined whether or not the orientation result is closer to the first branch point from the orientation reference point. judge. If it is determined in step 95 that the orientation result is closer to the orientation point than the first branch point, the process proceeds to step 96 where one calculated result is set.
[0083]
If it is determined in step 95 that the orientation result is beyond the first branch point, the process proceeds to step 951, where it is confirmed whether the data of the orientation reference terminal and other terminals constituting the branch point can be acquired. .
[0084]
If it is determined in step 951 that the data of other terminals can be acquired, the voltage and current data of the branch point is calculated in step 952, and then the process proceeds to step 953. In this step 953, the orientation calculation of the next section is performed with reference to the branch point where the voltage and current are calculated in step 952, and the process returns to step 95 to make a determination.
[0085]
If it is determined in step 951 that data of other terminals cannot be acquired, the process proceeds to step 97. In this step 97, it is confirmed whether there is any terminal that has not been standardized other than the terminal from which data has not been acquired. If there is a terminal that has not been standardized, the process returns to step 93 and one terminal is selected from the data acquisition terminal. select. If it is determined in step 97 that there is no terminal that has not been standardized other than the terminal from which data could not be acquired, the process proceeds to step 98, and one or more standardization results calculated so far are set and processed. finish.
[0086]
According to the above processing, even if it is confirmed that the data to be received is insufficient, an accurate orientation result can be obtained without going through a complicated orientation procedure.
[0087]
The fifth embodiment of the accident point locating apparatus according to the present invention will be described. The configuration is the same as that of the block diagram shown in FIG.
[0088]
In the fifth embodiment, the data can be acquired when it is confirmed that the received electric quantity data is insufficient with respect to the second orientation calculation means 24 of the accident point location device in the first embodiment. Based on the terminal conditions and data acquisition status in the system, the most suitable one terminal is determined as the standard reference end, and the function of performing the standard calculation using only the data of the standard terminal is provided. It is.
[0089]
Here, the processing of the second orientation calculation means 24 will be described with reference to the flowchart shown in FIG.
[0090]
First, a terminal from which data has been acquired in step 101 is extracted, one terminal is selected from the terminals extracted in step 101 in step 102, and then the process proceeds to step 103.
[0091]
In step 103, it is confirmed whether there is a positive-phase power source behind the terminal on the system. If there is a power source, in step 104, the orientation calculation using only the data of the terminal is performed, and the process goes to step 105. If no power is supplied, the process returns to step 102 to select another terminal.
[0092]
In step 105, it is confirmed whether or not an operation based on another terminal is necessary. If necessary, the process returns to step 102, and if not necessary, the process is terminated.
[0093]
In the above step 102, it is preferable to confirm whether or not the following items are satisfied as a guideline for selecting another terminal.
[0094]
・ There is a separate strong power supply terminal in the system
-The orientation result was beyond the branch point
Thereby, even when it is confirmed that the data to be received is insufficient, it is possible to obtain a highly reliable orientation result without going through a complicated orientation procedure.
[0095]
The sixth embodiment of the accident point locating apparatus according to the present invention will be described. The configuration is the same as that of the block diagram shown in FIG.
[0096]
In the sixth embodiment, when it is confirmed that the received electrical quantity data is insufficient with respect to the second orientation calculation means 24 of the accident point location device in the first embodiment, the power transmission line at that terminal Assuming that the circuit breaker is open, the current data of the terminal is regarded as zero, and a function for performing the orientation calculation using only the data of the other terminals is provided.
[0097]
Here, the processing of the second orientation calculation means 24 will be described with reference to the flowchart shown in FIG.
[0098]
First, in step 111, a terminal for which data could not be acquired is extracted, and the process proceeds to step 112. In this step 112, it is assumed that the circuit breaker of the terminal is open, and the orientation calculation using all data other than the terminal is performed. The orientation calculation method at this time is the calculation that applies the data at all ends corresponding to the above-mentioned formula (1) or (2), but since the terminal that could not acquire the data is regarded as the circuit breaker open state, It is not the standard terminal for orientation.
[0099]
When the orientation calculation is performed in step 112, it is determined in step 113 whether or not the orientation result is in the vicinity of the branch point, and if it is in the vicinity, branching is performed after calculating the voltage and current of the branch point in step 114. Orientation beyond the point.
[0100]
If it is determined in step 113 that the orientation calculation result in step 112 is not near the branch point, the orientation calculation result in step 112 is output as it is.
[0101]
FIG. 12 shows a data acquisition situation from each terminal device at the time of an accident in a transmission line having four terminals. For example, in the power transmission line shown in FIG. 12, an accident occurred in the power transmission line 1L in the section 2, and data collection was performed for all terminal devices from the central processing unit. Consider the case where both cannot be acquired. In this case, since the data can be acquired for the A terminal, the B terminal, and the C terminal, the orientation calculation based on the A end data and the B end data and the orientation calculation based on the A end data and the C end data are performed. Will do.
[0102]
First, the branch point E is derived as a result by the orientation calculation based on the A-end data and the B-end data, and then the fault point in the section 2 is correctly located by the orientation calculation based on the A-end data and the C-end data. It becomes possible.
[0103]
Thereby, even when it is confirmed that the data to be received is insufficient, it is possible to obtain a highly reliable orientation result without going through a complicated orientation procedure.
[0104]
In each of the above-described embodiments, the case where the present invention is applied to a four-terminal power transmission system has been described. However, even if the present invention is applied to a multi-terminal, that is, a power transmission system having two or more terminals, the same effects as described above can be obtained. It is something that can be done.
[0105]
【The invention's effect】
As described above, according to the present invention, an accident point locating device capable of obtaining a precise locating result even when some data cannot be collected due to a failure of a data collecting terminal or an abnormality of a transmission line. Can be provided.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram showing a first embodiment of an accident point locating device according to the present invention.
FIG. 2 is a system diagram showing a state of a circuit breaker in a power transmission line having four terminals used for explaining the operation of the embodiment.
FIG. 3 is a flowchart showing a processing example of a second orientation calculation means in the embodiment.
FIG. 4 is a system diagram showing an example of a data acquisition situation from each terminal device at the time of an accident in a power transmission line having four terminals used for explaining the operation of the embodiment.
FIG. 5 is a system diagram showing another example of a data acquisition situation from each terminal device at the time of an accident in a power transmission line similarly having four terminals.
FIG. 6 is a system diagram for explaining processing of second orientation calculation means in the embodiment;
FIG. 7 is a block configuration diagram showing a second embodiment of an accident point locating device according to the present invention.
FIG. 8 is a flowchart showing processing of second orientation calculation means in the third embodiment of the present invention.
FIG. 9 is a flowchart showing processing of second orientation calculation means in the fourth embodiment of the present invention.
FIG. 10 is a flowchart showing processing of second orientation calculation means in the fifth embodiment of the present invention.
FIG. 11 is a flowchart showing processing of second orientation calculation means in the sixth embodiment of the present invention.
FIG. 12 is a system diagram showing an example of a data acquisition situation from each terminal device at the time of an accident in a power transmission line having four terminals used for explaining the operation of the embodiment.
[Explanation of symbols]
A, B, C, D ... terminals
B_A, B_B, B_C, B_D... Bus
1L, 2L ... Transmission line
CT11A, CT12A, CT11B, CT12B, CT11C,
CT12C, CT11D, CT12D ... Current transformer
PT13A, PT13B, PT13C, PT13D ... Transformer
CB11A, CB12B, CB11B, CB12B, CB11C, CB12C, CB11D, CB12D ... current transformer
10A, 10B, 10C, 10D... Terminal device
E1, E2 ... Power supply
Z1, Z2 ... rear impedance of transmission line
11. Data input means
12: Data storage means
13. Data transmission means
20 ... Central processing unit
21 ... Data acquisition means
22 ... Acquisition data confirmation means
23. First orientation calculation means
24. Second orientation calculation means
25. Orientation result output means
26. Data recollection means

Claims (6)

A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. When confirming that all the electric quantity data has been acquired by the acquisition data confirmation means and the acquisition data confirmation means, the fault point location of the transmission line is determined using all the data acquired from each terminal device. When it is confirmed that there is a shortage in the electric quantity data acquired from each terminal device by the first orientation calculation means to be performed and the acquisition data confirmation means, the data that could not be obtained was rejected and only the data of one terminal was used a second locating calculation means for performing all been acquired orientation calculation data terminal, the orientation results by said first orientation calculation means or said second orientation calculation means Fault point locating system being characterized in that an orientation results output means for specifying a section in which the presence of the late point or fault point. A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. When confirming that all the electric quantity data has been acquired by the acquisition data confirmation means and the acquisition data confirmation means, the fault point location of the transmission line is determined using all the data acquired from each terminal device. When it is confirmed that there is a shortage in the electric quantity data acquired from each terminal device by the first orientation calculation means to be performed and the acquisition data confirmation means, the data that could not be obtained was rejected and only the data of one terminal was used The orientation calculation is performed for all terminals for which data has been acquired, and for the location beyond the branch point, the voltage and current at the branch point are calculated from the electrical quantity data of the terminal for which data was acquired. A second locating calculation means for performing orientation until no data acquisition terminal out, identifying the first orientation calculation means or section where the presence of the fault point or the fault point to the locating result of the second orientation calculation means An accident point locating device comprising an orientation result output means. A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. When confirming that all the electric quantity data has been acquired by the acquisition data confirmation means and the acquisition data confirmation means, the fault point location of the transmission line is determined using all the data acquired from each terminal device. When it is confirmed that there is a shortage in the electric quantity data acquired from each terminal device by the first orientation calculation means to be performed and the acquisition data check means, the data that could not be acquired is rejected, and the terminal that has acquired the data Based on the terminal conditions and data acquisition status in the system, the most suitable terminal is determined as the standard reference end, and the standard calculation is performed using only the standard terminal data. Comprising: the second orientation calculation unit, and an orientation results output means for identifying said first locating calculation means or said second locating calculation means segments the presence of the fault point or the fault point to the orientation results by Accident point locator. A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. Confirming that there is a deficiency in the amount of electricity data acquired from each terminal by means of this acquisition data confirmation means, the terminal device for which the amount of electricity data could not be acquired through the data acquisition means Data re-collecting means for collecting data and confirming that all the electric quantity data has been obtained by the obtained data confirming means, and using all the data obtained from each of the terminal devices, First orientation calculation means for performing orientation, and electricity acquired from each terminal by the acquired data confirmation means even if data is collected by the data recollection means If it is confirmed that there is a deficiency in the data, the second orientation calculation means for rejecting the data that could not be acquired and performing the orientation calculation using only the data of one terminal for all the terminals that could acquire the data, and the first An accident point locating device comprising: an orientation point output means for specifying an accident point or a section where the accident point exists from an orientation result of the second orientation calculation means or the orientation result of the second orientation calculation means . A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. Confirming that there is a deficiency in the amount of electricity data acquired from each terminal by means of this acquisition data confirmation means, the terminal device for which the amount of electricity data could not be acquired through the data acquisition means Data re-collecting means for collecting data and confirming that all the electric quantity data has been obtained by the obtained data confirming means, and using all the data obtained from each of the terminal devices, First orientation calculation means for performing orientation, and electricity acquired from each terminal by the acquired data confirmation means even if data is collected by the data recollection means If it is confirmed that there is a shortage of data, the data that could not be acquired will be rejected, the orientation calculation using only the data of one terminal will be performed for all the terminals that have acquired the data, and the data for the orientation beyond the branch point will be acquired A second orientation calculation means for calculating the voltage and current at the branch point from the electric quantity data of the terminal thus obtained and performing the orientation to the data unacquired terminal, and the first orientation calculation means or the second orientation calculation means. An accident location system comprising an orientation result output means for specifying an accident point or a section where the accident point exists from the orientation result obtained by the method . A terminal device that is installed at each terminal of a power transmission system in which two or more terminals are connected by a plurality of power transmission lines, and obtains electric quantity data from each line, and electric quantity data transmitted from each terminal apparatus In an accident point locating device consisting of a central processing unit that locates the accident point at the time of the transmission line accident using these electric quantity data,
Each of the terminal devices includes a data input unit that takes in an electric quantity from the system via an input converter and converts it into digital data, a data storage unit that stores data input from the data input unit when an accident occurs, Data transmission means for transmitting the electrical quantity data stored in the data storage means to the central processing unit,
Whether the central processing unit has all the data to be acquired with respect to the data acquisition means for acquiring the electrical quantity data at the time of an accident transmitted from each terminal apparatus and the electrical quantity data obtained from each terminal apparatus. Confirming that there is a deficiency in the amount of electricity data acquired from each terminal by means of this acquisition data confirmation means, the terminal device for which the amount of electricity data could not be acquired through the data acquisition means Data re-collecting means for collecting data and confirming that all the electric quantity data has been obtained by the obtained data confirming means, and using all the data obtained from each of the terminal devices, First orientation calculation means for performing orientation, and electricity acquired from each terminal by the acquired data confirmation means even if data is collected by the data recollection means When it is confirmed that there is a lack of data, the data that could not be acquired is rejected. From the terminals that were able to acquire data, based on the terminal conditions and the data acquisition status in the system, the optimal reference standard end A second orientation computing means for determining the terminal and performing orientation computation using only the data of the reference terminal, and an accident point or accident from the orientation result by the first orientation computing means or the second orientation computing means. An accident point locating device comprising an orientation result output means for specifying a section where points are present .

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