JP3895288B2 - Transmission line accident location system, transmission line accident location method, transmission line accident location program, and recording medium recording the program - Google Patents

Description

【００７７】
但し、式１は回線１Ｌを基準としている場合に用いる式である。同式においてＩ_01L は回線ＩＬの零相電流、Ｉ_02L は回線２Ｌの零相電流である。事故回線が回線２Ｌである場合についても同式を用いている。
【００７８】
このような式１の代わりに式２を用いると、二線地絡事故（二線短絡事故）の事故点を標定することが可能である。

【００７９】
但し、式２は回線１Ｌを基準としており、事故相がａ及びｂ相の場合に用いる式である。同式においてＩ_ab1Lは回線ＩＬのａ−ｂ相の線間電流、Ｉ_ab2Lは回線２Ｌのａ−ｂ相の線間電流である。事故回線が回線２Ｌである場合についても同式を用いており、事故相がｂ及びｃ相である場合については同様の式を用いている。
【００８０】
この場合、電流分流比演算部１０において、自動オシログラフ装置２から出力された実測データに含まれる事故時の零相電流ではなく事故相の線間実測電流データに基づいて一線地絡の場合と同様に電流分流比ｋを求める一方、事故標定部２０において、系統シミュレータ２１を利用して送電線αに二線地絡事故（二線短絡事故）が発生したと想定して仮想電流データ及び仮想電流分流比Ｋを一線地絡の場合と同様に求めるように設計変更するだけで良い。
【００８１】
一方、式１の代わりに式３を用いると、三線地絡事故（三線短絡事故）の事故点を標定することが可能である。

【００８２】
但し、式３は回線１Ｌを基準としている場合に用いる式であり、同式においてＩ_11L は回線ＩＬの正相電流、Ｉ_12L は回線２Ｌの正相電流である。
【００８３】
この場合、電流分流比演算部１０において、自動オシログラフ装置２から出力された実測データに含まれる事故時の零相電流ではなく、正相の実測電流データに基づいて一線地絡の場合と同様に電流分流比ｋを求める一方、事故標定部２０において、系統シミュレータ２１を利用して送電線αに三線地絡事故（三線短絡事故）が発生したと想定して仮想電流データ及び仮想電流分流比Ｋを一線地絡の場合と同様に求めるように設計変更するだけで良い。
【００８４】
このような式１乃至式３を用いて事故点を標定するには、事故回線の送電端の実測電流データが必要不可欠であり（片端オシロ）、この場合の主たる適用系統としては、回線１Ｌと回線２Ｌとがループになっている送電系統であり、７７ｋＶ以下だけでなく１５４ｋＶの高圧送電系統も対象に含まれる。
【００８５】
ところが、２７５ｋＶ以上の直接接地された送電系統については、受電端の接地線を介した事故電流が影響するため、式１乃至式３を用いて地絡事故／短絡事故の事故点を標定することはできない。このような送電系統に適用する場合、式１、２、３の代わりに下記の式４、５、６を各々用いる。このような式４乃至式６を用いて事故点を標定するには、事故回線の送電端だけでなく受電端の実測電流データが必要不可欠になる（両端オシロ）。

【００８６】
但し、式４は回線ＩＬを基準としている場合に用いる式である。同式においてＩ_01LRは回線１Ｌの受電側零相電流、Ｉ_01LSは回線１Ｌの送電側零相電流、Ｉ_02LSは回線２Ｌの受電側零相電流、Ｉ_01LSは回線１Ｌの送電側零相電流である。事故回線が回線２Ｌである場合についても同式を用いている。

【００８７】
但し、式５は回線ＩＬを基準としており、事故相がａ及びｂ相である場合に用いる式である。同式においてＩ_ab1LR は回線ＩＬのａ−ｂ相の受電側線間電流、Ｉ_ab1LS は回線２Ｌのａ−ｂ相の受電側線間電流、Ｉ_ab2LR は回線２Ｌのａ−ｂ相の送電側線間電流、Ｉ_ab2LS は回線２Ｌのａ−ｂ相の送電側線間電流である。事故回線が回線２Ｌである場合についても同式を用いており、事故相がｂ及びｃ相である場合については同様の式を用いている。

【００８８】
但し、式６は回線ＩＬを基準としている場合に用いる式である。同式においてＩ_1LR は回線ＩＬの受電側正相電流、Ｉ_1LS は回線１Ｌの受電側正相電流、Ｉ_12LRは回線２Ｌの送電側正相電流、Ｉ_12LSは回線２Ｌの送電側正相電流である。事故回線が回線２Ｌである場合についても同式を用いている。
【００８９】
即ち、直接接地された送電系統であっても、式１の代わりに式４を用いると、一線地絡事故を、式５を用いると二線地絡事故（二線短絡事故）を、式６を用いると三線地絡事故（三線短絡事故）の事故点を一線地絡の場合と全く同様に各々標定することが可能である。この場合、２７５ｋＶ以上の超高圧送電系統にも適用可能である。
【００９０】
なお、第２の変形例による場合、二回線送電線の各種の地絡事故又は短絡事故の事故点を標定することが可能になることは上記したが、第１の実施の形態と同様の手法を用いてその事故原因等を標定することができるのは当然である。特に短絡事故であっても、例えば、電線の接触を原因とするものか氷雪等の付着を原因とするものによって、電線αの実測データに含まれる短絡電流又は短絡電圧に特有の波形が現れるので、一線地絡事故の場合と同様の手法を用いてその事故原因を標定することが可能である。また、第１の変形例と同一の手法を用いて、事故発生後の安定区間Ｔｓの電流分流比ｋのデータを用いて平均化電流分流比ｋ’を求めることができることも当然である。
【００９１】
以下、第２の実施の形態についての図１９を参照して説明する。図１９は同形態に係る送電線事故点標定装置のブロック図である。第１の実施の形態においては、第１、第２の変形例も含めて、電流分流比法を用いて送電線の地絡事故／短絡事故の事故点を標定していた。電流分流比法で適用対象となる送電系統は二回線であり、その性質上、一回線は適用対象外である。一回線の送電系統を適用対象にするには、図１９に示す送電線事故点標定装置１００を用いると良い（図１参照）。
【００９２】
ここに掲げる送電線事故点標定装置１００は、インピーダンス法を用いて送電線の地絡事故又は短絡事故の事故点を標定する等の機能を有した装置であって、送電線の実測データに基づいてインピーダンスｋを瞬時値毎に求めるとともに事故発生後所定期間のインピーダンスｋを平均化するインピーダンス演算部６０と、電流分流比／インピーダンス演算部６０で求められた平均化インピーダンスｋ’に基づいて地絡事故又は短絡事故の事故点を標定する事故標定部７０とを具備している。インピーダンス演算部６０には、第１の実施の形態の電流分流比演算部１０とは異なり、事故回線の送電端の実測電流データに加えて実測電圧データを入力することが必要になる（片端オシロ）。なお、第１の実施の形態と同様である構成部については同一の部品番号を付してその説明は省略する。
【００９３】
インピーダンス演算部６０は、前記実測電流データ及び実測電圧データに下記の計算式を当てはめてインピーダンスｋを求めるようになっている。電流分流比演算部１０との相違はインピーダンスｋを求める計算式が異なるだけであり、平均化インピーダンスｋ’を求める方法等については第１の実施の形態又は第１の変形例の場合と全く同様であるので、その説明は省略する。
【００９４】
事故標定部７０は、系統シミュレータ７１を利用して送電線に地絡事故又は短絡事故が発生したと想定して仮想電流データ及び仮想電圧データを求め、当該データから仮想インピーダンスＫを求め、系統シミュレータ７１上の仮想事故点を変化させつつ、当該仮想事故点に対応する仮想インピーダンスＫと平均化インピーダンスｋ’とを逐次対比し、これにより両者が最も近い仮想インピーダンスＫを探し、当該仮想インピーダンスＫに対応する仮想事故点を当該地絡事故又は短絡事故の事故点として標定する基本構成となっている。事故標定部２０との相違は、仮想インピーダンスＫを求める計算式が異なるだけである。仮想インピーダンスＫから最終的に事項点を標定する方法等については、第１の実施の形態の場合と全く同様であるので、その説明は省略する。
【００９５】
インピーダンス演算部６０にてインピーダンスｋを求める計算式については以下の通りである。また、同様の計算式を用いて事故標定部７０にて仮想インピーダンスＫを求めている。
【００９６】
一線地絡事故の事故点を標定する場合、第１の実施の形態で用いた式１の代わりに式７を用いる。
［式７］
ｋ＝Ｉｍ｛Ｖ_a ／Ｉ₀ ｝
【００９７】
但し、式７は事故相がａ相である場合に用いる式であり、同式においてｋは零相リアクタンスであり、Ｖ_a はａ相の相電圧、Ｉ₀ は零相電流である。事故相がｂ又はｃ相である場合も同様の式を用いている。
【００９８】
二線地絡事故又は二線短絡事故の事故点を標定する場合、第１の実施の形態の第２の変形例で用いた式２の代わりに式８を用いる。
［式８］
ｋ＝2 ・Ｉｍ｛（Ｖ_a − Ｖ_b ）／（Ｉ_a − Ｉ_b ）｝
【００９９】
但し、式８は事故相がａ及びｂ相である場合に用いる式である。同式においてｋはａ−ｂ相の線間リアクタンス、Ｖ_a はａ相の相電圧、Ｖ_b はｂ相の相電圧、Ｉ_a はａ相の相電流、Ｉ_b はｂ相の相電圧である。事故相がｂ及びｃ相である場合についても同様の式を用いている。
【０１００】
三線地絡事故又は三線短絡事故の事故点を標定する場合、第１の実施の形態の第２の変形例で用いた式３の代わりに式９を用いる。
［式９］
ｋ＝Ｉｍ｛Ｖ₁ ／Ｉ₁ ｝
【０１０１】
但し、式９においてｋは正相リアクタンス、Ｖ₁ は正相電圧、Ｉ₁ は正相電流である。
【０１０２】
なお、インピーダンス演算部６０及び事故標定部７０としての機能は図１９に示すメモリ５０に記録された送電線事故点標定用プログラムが実行されることにより実現されるようになっているのは第１の実施の形態の場合と同様である。
【０１０３】
上記のように構成された送電線事故点標定装置２による場合、送電線事故点標定装置１と比較すると、事故点の標定方法が電流分流比法であるかインピーダンス法であるかの違いだけであり、第１の変形例を同様に適用する場合も含めて、その機能等については全く同一である。従来、インピーダンス法を用いて事故点を標定した場合も電流分流比法の場合と同一の欠点を有していた。よって、第１の実施の形態の場合と同一の効果を奏することになる。
【０１０４】
ただ、第１の実施の形態の場合、第２の変形例を含めて、送電系統がループになっていない二回線には適用対象外であるが、送電線事故点標定装置２による場合、二回線であり且つループになっていない送電系統にも適用可能である。即ち、ループになっていない二回線の送電線であっても、事故相の実測データ等を用いる限り、式７を用いて一線地絡事故、式８を用いて二線地絡事故（二線短絡事故）、式９を用いて三線地絡事故（三線地絡事故）の事故点をそれぞれ標定することが可能になるという別の効果を奏する。
【０１０５】
以下、第３の実施の形態についての図２０及び図２１を参照して説明する。図２０は同形態に係る送電線事故点標定装置のブロック図である。
【０１０６】
第１、第２の実施の形態においては、第２の変形例も含めて、適用される送電系統や事故様相が基本的に一つに制限されていた例であったが、上記した全ての送電系統や事故様相に適用可能にする場合、図２０に示す送電線事故点標定装置２００を用いると良い（図１参照）。
【０１０７】
なお、送電線事故点標定装置２００には、図１に示すように変電所に設置された自動オシログフラ装置２にて測定された送電線αの実測データを含めて、全ての変電所等に設置された図外の自動オシログラフ装置にて測定された送電線の実測データが、自動オシログラフ装置の設置箇所を示す送電線データも含めて転送されているものとする。
【０１０８】
ここに掲げる送電線事故点標定装置２００は、電流分流比法又はインピーダンス法を用いて送電線の地絡事故／短絡事故の事故点を標定する機能を有した装置であり、具体的には前記送電線の実測データに基づいて電流分流比ｋ又はインピーダンスｋを瞬時値毎に求めるとともに事故発生後所定期間の電流分流比ｋ又はインピーダンスｋを平均化する電流分流比／インピーダンス演算部８１と、電流分流比／インピーダンス演算部８０で求められた平均化電流分流比ｋ’又は平均化インピーダンスｋ’に基づいて当該地絡事故／短絡事故の事故点を標定する事故標定部８２と、前記送電線の実測データ及び予め用意された当該送電線の回線情報（ここでは回線数、直接接地系であるか否か、一回線の場合、ループになっている系統か否か等の情報）に基づいて当該事故の事故様相（ここでは一回線送電線、ループになっている二回線送電線、ループになっていない二回線送電線、直接接地系になっている二回線送電線の各々における一線地絡、二線地絡（二線短絡）又は三線地絡（三線短絡）等）を判定する事故様相判定部８３とを具備している。
【０１０９】
なお、第１、第２の実施の形態と同様である構成部については同一の部品番号を付してその説明は省略するが、図２０に示すメモリ５０には送電線の回線情報が送電線データ毎に予め記録されているものとする。
【０１１０】
事故様相判定部８３は、ここでは入力された送電線の実測データに基づいて事故の発生を検知し、事故の発生を検知したときには、メモリ５０を検索して当該実測データに含められた送電線データに対応する回線情報を読み出し、読み出された回線情報及び当該実測データに基づいて事故の事故様相を判定する構成となっている。
【０１１１】
電流分流比／インピーダンス演算部８１は、第１、第２の実施の形態（第１の変形例を含む）の電流分流比演算部１０及びインピーダンス演算部６０の機能を兼ね備えているもので、実測データに基づいて電流分流比ｋ又はインピーダンスｋを計算するに当たり、事故様相判定部８３の判定結果に対応した計算式を用いて行う構成となっている。
【０１１２】
即ち、事故様相判定部８３の判定結果がループになっている二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式１、式２、式３をそれぞれを用いて電流分流比ｋを計算する（電流分流比法、片端オシロ）一方、ループになっていない二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式７、式８、式９をそれぞれを用いてインピーダンスｋを計算する（インピーダンス法）。また、直接接地系の二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式４、式５、式６をそれぞれを用いて電流分流比ｋを計算し（電流分流比法、両端オシロ）、一回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式７、式８、式９をそれぞれを用いてインピーダンスｋを計算する（インピーダンス法）。
【０１１３】
事故標定部８２は、第１、第２の実施の形態の事故標定部２０及び事故標定部７０の機能を兼ね備えているもので、仮想電流データ及び／又は仮想電圧データから仮想電流分流比Ｋ又は仮想インピーダンスＫを計算するに当たり、事故様相判定部８３の判定結果に対応した計算式を用いて行う構成となっている。
【０１１４】
即ち、事故様相判定部８３の判定結果がループになっている二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式１、式２、式３をそれぞれを用いて仮想電流分流比Ｋを同様に計算する一方、ループになっていない二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式７、式８、式９をそれぞれを用いて仮想インピーダンスＫを同様に計算する。また、直接接地系の二回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式４、式５、式６をそれぞれを用いて仮想電流分流比Ｋを同様に計算し、一回線送電線での一線地絡、二線地絡（二線短絡）、三線地絡（三線短絡）をそれぞれ示すときには、式７、式８、式９をそれぞれを用いて仮想インピーダンスＫを同様に計算する。
【０１１５】
なお、電流分流比／インピーダンス演算部８１、事故標定部８２及び事故様相判定部８３としての機能は図２０に示すメモリ５０に記録された送電線事故点標定用プログラムが実行されることにより実現されるようになっているのは第１、第２の実施の形態の場合と同様である。
【０１１６】
このような送電線事故点標定装置２００による場合、送電系統や事故様相に関係なくあらゆるケースの事故点等を標定することができ、送電線事故が発生した場合の事故復旧を実施又は指令する支店や電力所において非常に使い勝手が良く、これらの点で装置の高性能化を図ることが可能になる。
【０１１７】
以下、送電線事故点標定装置２００にて処理される送電線事故点標定用プログラムの一例を図２１を参照して説明する。同プログラムは、送電線事故が発生すると事故点の標定等の処理を自動的に行うのではなく、事故発生検出や事故点標定法等の選択等の点で半自動であり、対話式で必要な標定情報等を得ることができるようになっている簡易型のものである。
【０１１８】
まず、送電線事故点標定装置２００を立ち上げると、事故点標定可能な送電線の送電線データ等の一覧がディスプレイ３０に表示される（Ｓ１）。
【０１１９】
そして、入力部４０を通じてホルダー情報の登録のコマンドが選択入力されたときは（Ｓ２）、新たに適用する送電系統の情報（系統構成、線路亘長、インピーダンス、送電線データ及び回線情報等）が入力部４０を通じて登録される（Ｓ３、Ｓ４、Ｓ５）。
【０１２０】
一方、特定の送電線に何らかの送電線事故が発生したとして、入力部４０を通じて送電線を特定して波形表示及び解析のコマンドが選択入力されたときは（Ｓ２）、メモリ５０に記録された当該送電線の実測データの波形をディスプレイ３０に表示し（Ｓ６）、その波形の全区間をスキャニングして波形の乱れがある箇所をサーチし（Ｓ７）、サーチされた箇所の実測データの波形等から事故様相を判定し、その判定結果をディスプレイ３０に表示する（Ｓ８）。
【０１２１】
その後、事故点標定法を電流分流比法に選択するコマンドが入力部４０を通じて入力されると（Ｓ８）、サーチされた箇所の実測データに基づいて電流分流比ｋを上記の通りに計算し、その波形を実測データの波形とともにディスプレイ３０に表示し（Ｓ９）、電流分流比ｋのグラフの安定区間Ｔｓを上記の通りにサーチする（Ｓ１０）。一方、事故点標定法をインピーダンス法に選択するコマンドが入力部４０を通じて入力されると（Ｓ８）、サーチされた箇所の実測データに基づいてインピーダンスｋを上記の通りに計算し、その波形を実測データの波形とともにディスプレイ３０に表示し（Ｓ１２）、インピーダンスｋのグラフの安定区間Ｔｓを上記の通りにサーチする（Ｓ１０）。
【０１２２】
ディスプレイ３０に実測データの波形が表示された状態で、事故原因標定のコマンドが入力部４０を通じて入力されると（Ｓ８）、サーチされた箇所の実測データに基づいて事故原因を上記の通りに標定し、その標定結果（図１２参照）をディスプレイ３０に表示する（Ｓ１１）。一方、ＯＫである旨のコマンドが入力部４０を通じて入力されると（Ｓ８）、系統シミュレータを立ち上げる（Ｓ１３）。
【０１２３】
そして事故点探索のコマンドが入力部４０を通じて入力されると（Ｓ１４）、電流分流比法が選択されているときは、安定区間Ｔｓの電流分流比ｋから平均化電流分流比ｋ’を求め、これに基づいて系統シミュレータを利用して上記した通りに事故点を標定し（Ｓ１５）、その標定結果（図１２参照）をディスプレイ３０に表示する（Ｓ１６）。一方、インピーダンス法が選択されているときは、安定区間Ｔｓのインピーダンスｋから平均化インピーダンスｋ’を求め、これに基づいて系統シミュレータを利用して上記した通りに事故点を標定し（Ｓ１５）、その標定結果（図１２参照）をディスプレイ３０に表示する（Ｓ１６）。
【０１２４】
ディスプレイ３０に標定結果が表示された状態で、グラフ表示のコマンドが入力部４０を通じて入力されると（Ｓ１４）、電流分流比法が選択されているときは、事故点と電流分流比ｋ等の関係を示すグラフ（図１３参照）をディスプレイ３０に表示する（Ｓ１７）。一方、インピーダンス法が選択されているときは、事故点とインピーダンスｋ等の関係を示すグラフ（図１３参照）をディスプレイ３０に表示する（Ｓ１７）。
【０１２５】
また、他のコマンドが入力部４０を通じて入力されると（Ｓ１４）、同コマンドに対応する処理を行い（Ｓ１８）、終了のコマンドが入力部４０を通じて入力されると（Ｓ１４）、ステップ８に飛び、事故点標定法を選択するコマンドの入力待ちに戻るようになっている。
【０１２６】
なお、本発明は上記した実施の形態に限定されず、適用される送電系統が問われないのは勿論のこと、次のように設計変更してもかまわない。例えば、送電線の実測データから平均化電流分流比又は平均化インピーダンスを直接に求めてもかまわない。また、電流分流比又はインピーダンスをフィルタして平均化する際のサイクル期間等については事故継続時間に応じて適宜設定すれば良く、電流分流比等を平均化する手法についても問われない。送電線の系統が単純であれば、系統シミュレータを用いることなく、平均化電流分流比又は平均化インピーダンスから事故点を直接に標定するようにしてもかまわない。さらに、電流分流比又はインピーダンス、仮想電流分流比又は仮想インピーダンスを各々計算するに当たり、当該事故の事故様相を判定することなく、当該事故の事故様相を設定入力し、当該設定入力に対応した計算式を用いて行うようにしてもかまわない。
【０１２７】
【発明の効果】
以上、本発明の請求項１に係る送電線事故点標定装置による場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定する構成となっているので、電流分流比法又はインピーダンス法でありながら事故点を高精度で標定することができ、装置の高性能化を図ることが可能になる。
【０１２８】
また、既存の系統シミュレータを上手く活用して送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を求め、同関係から事故点を標定する構成となっているので、従来例による場合とは異なり、たとえ送電線の系統が複雑に分岐した対象であっても、事故点を標定することが可能になる。即ち、従来例による場合に比較して電流分流比法又はインピーダンス法の適用可能な範囲が大きく広がり、この点で装置の高性能化を図ることが可能になる。
【０１２９】
さらに、系統シミュレータを用いて求めた送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正する構成となっているので、同装置を使用する度に標定精度が向上し、この点で装置の高性能化を図ることが可能になる。
【０１３０】
本発明の請求項２に係る送電線事故点標定装置による場合、変化量が最も小さい安定区間の電流分流比又はインピーダンスを平均化して平均化電流分流比又は平均化インピーダンスを求め、これを用いて事故点を標定する構成となっているので、標定精度が向上し、この点で装置の高性能化を図ることが可能になる。
【０１３１】
本発明の請求項３に係る送電線事故点標定装置による場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定する構成となっているので、電流分流比法又はインピーダンス法でありながら事故点を高精度で標定することができ、装置の高性能化を図ることが可能になる。また、変化量が最も小さい安定区間の電流分流比又はインピーダンスを平均化して平均化電流分流比又は平均化インピーダンスを求め、これを用いて事故点を標定する構成となっているので、標定精度が向上し、この点で装置の高性能化を図ることが可能になる。さらに、送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正する構成となっているので、同装置を使用する度に標定精度が向上し、この点で装置の高性能化を図ることが可能になる。
【０１３２】
本発明の請求項４に係る送電線事故点標定装置による場合、送電線事故の事故点だけでなく、実測データに含まれる電流／電圧波形の特徴からその事故原因も標定する構成となっているので、適切な措置を早急にとることができ、この点で装置の高性能化を図ることが可能になる。
【０１３３】
本発明の請求項５に係る送電線事故点標定装置による場合、送電線事故の事故様相を判定し、これに対応した計算式を用いて電流分流比又はインピーダンス及び仮想電流分流比又は仮想インピーダンスを計算する構成となっているので、送電系統の種類や回線数に関係なく全ての地絡事故又は短絡事故の事故点を標定することが可能になり、これに伴って適用可能な範囲が格段に広がり、この点で装置の高性能化を図ることが可能になる。
【０１３４】
本発明の請求項６に係る送電線事故点標定法による場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定するようになっている。また、既存の系統シミュレータを上手く活用して送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を求め、同関係から事故点を標定するようになっている。さらに、系統シミュレータを用いて求めた送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正するようになっている。それ故、請求項１と同様のメリットがある。
【０１３５】
本発明の請求項７に係る送電線事故点標定法による場合、既存の系統シミュレータを上手く活用して送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を求め、同関係から事故点を標定するようになっているので、請求項２と同様のメリットがある。
【０１３６】
本発明の請求項８に係る送電線事故点標定法による場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定するようになっている。また、変化量が最も小さい安定区間の電流分流比又はインピーダンスを平均化して平均化電流分流比又は平均化インピーダンスを求め、これを用いて事故点を標定するようになっている。送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正するようになっている。それ故、請求項３と同様のメリットがある。
【０１３７】
本発明の請求項９に係る送電線事故点標定法による場合、送電線事故の事故点だけでなく、実測データに含まれる電流／電圧波形の特徴からその事故原因も標定する構成となっているので、請求項４と同様のメリットがある。
【０１３８】
本発明の請求項１０に係る送電線事故点標定法による場合、送電線事故の事故様相を判定し、これに対応した計算式を用いて電流分流比又はインピーダンス及び仮想電流分流比又は仮想インピーダンスを計算するようになっているので、請求項５と同様のメリットがある。
【０１３９】
本発明の請求項１１に係る送電線事故点標定用プログラムによる場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定する内容になっている。また、既存の系統シミュレータを上手く活用して送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を求め、同関係から事故点を標定する内容になっている。さらに、系統シミュレータを用いて求めた送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正する内容になっている。それ故、請求項１と同様のメリットを奏する。
【０１４０】
本発明の請求項１２に係る送電線事故点標定用プログラムによる場合、変化量が最も小さい安定区間の電流分流比又はインピーダンスを平均化して平均化電流分流比又は平均化インピーダンスを求め、これを用いて事故点を標定するようになっているので、請求項２と同様のメリットがある。
【０１４１】
本発明の請求項１３に係る送電線事故点標定用プログラムによる場合、電流分流比又はインピーダンスの瞬時値ではなく、これを平均化して求めた平均化電流分流比又は平均化インピーダンスに基づいて事故点を標定する内容になっている。また、変化量が最も小さい安定区間の電流分流比又はインピーダンスを平均化して平均化電流分流比又は平均化インピーダンスを求め、これを用いて事故点を標定するようになっている。さらに、送電線の仮想事故点と平均化電流分流比又は平均化インピーダンスとの関係を入力された実際の特定事故点により自動的に補正するようになっているので、請求項３と同様のメリットがある。
【０１４２】
本発明の請求項１４に係る送電線事故点標定用プログラムによる場合、送電線事故の事故点だけでなく、実測データに含まれる電流／電圧波形の特徴からその事故原因も標定する構成となっているので、請求項４と同様のメリットがある。
【０１４３】
本発明の請求項１５に係る送電線事故点標定用プログラムによる場合、送電線事故の事故様相に対応した計算式を用いて電流分流比又はインピーダンス及び仮想電流分流比又は仮想インピーダンスを計算するようになっているので、請求項５と同様のメリットがある。
【０１４４】
本発明の請求項１６に係る送電線事故点標定用プログラムを記録した記録媒体による場合、請求項１１乃至１５の送電線事故点標定用プログラムが記録されているので、これがコンピュータにより処理されることを通じて請求項１１乃至１５と同様のメリットを期待することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を説明するための図であって、送電線の電圧・電流データ伝送経路図である。
【図２】本発明の第１の実施の形態を説明するための図であって、送電線の系統図である。
【図３】本発明の第１の実施の形態を説明するための図であって、送電線事故点標定装置のブロック図である。
【図４】本発明の第１の実施の形態を説明するための図であって、同装置により処理される送電線事故点標定用プログラムのフローチャートである。
【図５】本発明の第１の実施の形態を説明するための図であって、実測電流データの電流波形図である。
【図６】本発明の第１の実施の形態を説明するための図であって、電流分流比の波形図である。
【図７】本発明の第１の実施の形態を説明するための図であって、平均化電流分流比の波形図である。
【図８】本発明の第１の実施の形態を説明するための図であって、系統シミュレータを用いて仮想電流分流比を探す方法を説明するための図である。
【図９】本発明の第１の実施の形態を説明するための図であって、仮想事故点と電流分流比（仮想電流分流比）との関係を示すグラフのデータの内容を説明するための図である。
【図１０】本発明の第１の実施の形態を説明するための図であって、事故電流の事故原因毎の波形図である。
【図１１】本発明の第１の実施の形態を説明するための図であって、事故電流の高調波の含有率を事故原因毎に示す図である。
【図１２】本発明の第１の実施の形態を説明するための図であって、一線地絡事故の事故点及び事故原因の標定結果を表示出力する例を示す図である。
【図１３】本発明の第１の実施の形態を説明するための図であって、仮想事故点と仮想電流分流比との関係を示すグラフのデータを補正する方法を説明するための図である。
【図１４】本発明の第１の実施の形態を説明するための図であって、同装置の事故点の標定誤差等を示した表である。
【図１５】本発明の第１の実施の形態を説明するための図であって、同装置の事故点の事故原因の正解率等を示した表である。
【図１６】本発明の第１の実施の形態の第１の変形例を説明するための図であって、電流分流比の拡大波形図である。
【図１７】本発明の第１の実施の形態の第１の変形例を説明するための図であって、電流分流比の安定区間をサーチする方法を説明するためのフローチャートである。
【図１８】本発明の第１の実施の形態の第１の変形例を説明するための図であって、同方法を説明するための電流分流比の模式的波形図である。
【図１９】本発明の第２の実施の形態を説明するための図であって、送電線事故点標定装置のブロック図である。
【図２０】本発明の第３の実施の形態を説明するための図であって、送電線事故点標定装置のブロック図である。
【図２１】本発明の第３の実施の形態を説明するための図であって、同装置にて処理される送電線事故点標定用プログラムの一例を示すフローチャートである。
【図２２】従来の電流分流比法を説明するための図である。
【符号の説明】
【００２０】
α 送電線
１Ｌ，２Ｌ 回線
１ 送電線事故点標定装置
１０ 電流分流比演算部
２０ 事故標定部
３０ ディスプレイパネル
４０ 入力部
５０ メモリ
１００ 送電線事故点標定装置
６０ インピーダンス演算部
７０ 事故標定部
３０ ディスプレイパネル
４０ 入力部
５０ メモリ
２００ 送電線事故点標定装置
８１ 電流分流比／インピーダンス演算部
８２ 事故標定部
８３ 事故様相判定部
３０ ディスプレイパネル
４０ 入力部
５０ メモリ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for locating an accident point or the like of a ground fault / short circuit accident of a transmission line using a current shunt ratio method or an impedance method.
[0002]
[Prior art]
A fault locator for detecting an accident point is often installed on 77 kV to 275 kV and 500 kV transmission lines. When a power transmission line accident occurs in the power transmission line in which the fault locator is installed, the data of the accident point is transferred from the fault locator to the power station and its branch. Then, the worker went straight to the site with reference to the data of the accident point, went around the display of the flashing indicator installed on the steel tower near the site, and finally identified the accident point.
[0003]
However, such fault locators are rarely installed on local transmission lines of 77 kV or lower. For this reason, an automatic oscilloscope device that is installed at a substation for the purpose of determining whether or not there is an accident and records changes in the current and voltage of the transmission line is utilized, and the oscilloscope data transferred from the device is used to make an accident. The point was located. Various proposals have been made as methods for locating accident points from oscilloscope data (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP 2000-227453 A
[0005]
In particular, the current shunt ratio method described below is well known as the simplest method for locating an accident point on a two-line transmission line.
[0006]
When a ground fault occurs at a point at a distance m from the power transmission end in a transmission line having a span of M as shown in FIG.₀₁In this case, a fault current (here, zero-phase current) represented by₀₂A fault current (here, zero-phase current) represented by flows. If the line impedance of the entire section of the line is constant and m / M = k (referred to as current shunt ratio), k and I₀₁And I₀₂Is k = 2I₀₂/ (I₀₁+ I₀₂).
[0007]
Specifically, the oscilloscope data transferred from the automatic oscillograph is loaded into the oscilloscope waveform analyzer, and the accident current I at the time of the accident₀₁, I₀₂The effective value for one cycle is obtained and substituted into the above equation to obtain the current shunt ratio k, and the fault point is determined from the current shunt ratio k.
[0008]
[Problems to be solved by the invention]
However, in the case of the conventional example, the following drawbacks are pointed out.
[0009]
First, the circuit 1L, 2L is easily affected by the circulating current existing before the accident, the current waveform disturbance and the current phase difference at the time of the accident, and the current shunt ratio k is not stable. The point location accuracy is very low compared to the fault locator (hereinafter referred to as the first defect). For this reason, even if an operator goes straight to the site after a one-line ground fault occurs, the point of the accident cannot be specified without patroling the wide range that is the interval of several flashing indicators. There is a problem that an immediate response cannot be taken.
[0010]
Second, when the transmission line system is complicatedly branched, the standardization formula for locating the fault point is different for each line from the current shunt ratio. Therefore, the current shunt ratio method is applied only when the transmission line system is simple (hereinafter referred to as a second defect).
[0011]
By the way, about 75% of the entire overhead power transmission line accident occurs in a transmission line of 77 kV or less, and 50 to 60% of the transmission line accidents occurring in the transmission line are single-line ground faults. As for the current shunt ratio method, the above-mentioned location accuracy is another problem, and it is possible to easily locate the accident point of a single-line ground fault, so application to a transmission line of 77 kV or less is required. Most of them are systems with 4 terminals or more, and the current situation is that they have not been applied.
[0012]
In addition to the current shunt ratio method, the impedance method is also well known as the simplest method for locating the transmission line fault point. The contents of this method will be described with reference to FIG. If a ground fault occurs on the line 1L, the transmission end voltage V₀(Here is the phase voltage of the accident phase) and the accident current I₀₁(Here, it is the phase current of the accident phase) Impedance k (= V₀/ I₀₁) Shows a value corresponding to the distance m from the power transmission end to the accident point, and there is a relationship that the impedance k increases as the distance m increases. Therefore, when the impingance k at the time of the accident is obtained based on the oscilloscope data, the accident point can be determined from this.
[0013]
When using such an impedance method, unlike the current shunt ratio method, it is possible to determine the fault point of a single line transmission line, but the impedance k at the time of the accident is not stable and the transmission line system is complicatedly branched. In this case, the calculation formula becomes complicated as in the case of the current shunt ratio method, and has the first and second drawbacks.
[0014]
The present invention has been created under the above-mentioned background, and the main object of the present invention is that it is possible to determine the fault point of a transmission line accident with high accuracy while using the current shunt ratio method or the impedance method. An object of the present invention is to provide a transmission line accident point location device, a transmission line accident point location method, a transmission line accident point location program, and a recording medium recording the program.
[0015]
[Means for Solving the Problems]
  The transmission line accident point locating device of the present invention is a device for locating an accident point of a ground fault / short-circuit accident of a transmission line using a current shunt ratio method or an impedance method, and based on actual measurement data of the transmission line A current shunt ratio / impedance calculator that obtains the current shunt ratio or impedance for each instantaneous value and averages the current shunt ratio or impedance for a predetermined period after the occurrence of the accident, and an average current obtained by the current shunt ratio / impedance calculator An accident location unit that locates the fault point of the ground fault / short circuit accident based on the shunt ratio or the averaged impedance;An input unit for inputting an actual specific accident point of a ground fault / short-circuit accident, and a virtual accident point and a virtual current shunt ratio or virtual obtained in a series of processes for locating the fault point of the ground / short-circuit accident Memory in which the relationship with impedance is recorded as graph dataIt is equipped with.
[0016]
  About accident location partVirtual current data and / or virtual voltage data is obtained on the assumption that a ground fault / short circuit accident has occurred in the transmission line using a system simulator, a virtual current shunt ratio or virtual impedance is obtained from the data, and a system simulator is obtained. While changing the virtual fault point above, the virtual current shunt ratio or virtual impedance corresponding to the virtual fault point and the average current shunt ratio or average impedance obtained by the current shunt ratio / impedance calculation unit are sequentially compared. In this way, the virtual current shunt ratio or virtual impedance that is closest to each other is searched, and the virtual accident point corresponding to the virtual current shunt ratio or virtual impedance is determined as the accident point of the ground fault / short circuit accident, When an actual specific accident point is input through the input unit, the graph shows the specific accident point and the virtual current component. Correct the graph data stored in the memory so that it passes through the intersection with the ratio or virtual impedance, and then refer to the corrected graph data to determine the fault point of the ground fault / short circuit accident. A virtual fault point related to the average current shunt ratio or average impedance obtained by the current shunt ratio / impedance calculation unit, and a function of locating this as the fault point of the ground fault / short circuit accident It has a configuration.
[0017]
  In particular, when an actual specific accident point is input through the input unit, the graph data held in the memory so that the graph passes through the intersection of the specific accident point and the virtual current shunt ratio or virtual impedance. After that, when locating the fault point of the ground fault / short-circuit accident, refer to the corrected graph data, and the average current shunt ratio or average obtained by the current shunt ratio / impedance calculation unit A configuration has a function of obtaining a virtual accident point related to the impedance and locating it as an accident point of the ground fault / short-circuit accident.
[0018]
  For the current shunt ratio / impedance calculation unit, when obtaining the averaged current shunt ratio or the averaged impedance, the current shunt ratio or the amount of change in the impedance is obtained, and then the stable section with the smallest amount of change is searched, and the stable section The current shunt ratio or impedance is averaged.
[0019]
Preferably, for the accident location unit, basic current / voltage waveform data at the time of a ground fault / short-circuit accident is prepared in advance for each cause of the accident, and the most current / voltage waveform included in the measured data of the transmission line is the most. It is desirable to use a configuration having a function of searching for near waveform basic data and locating the cause of the accident corresponding to the waveform basic data as the cause of the ground fault / short circuit accident.
[0020]
Preferably, an accident aspect determination unit that determines an accident aspect of the accident based on actual measurement data of the transmission line and line information of the transmission line prepared in advance is provided, and the current division ratio is calculated by the current division ratio / impedance calculation unit. Alternatively, it is desirable to use a calculation formula corresponding to the determination result of the accident aspect determination unit when calculating the virtual current shunt ratio or virtual impedance in the impedance and the accident localization unit.
[0021]
The transmission line accident location method, the transmission line accident location program, and the recording medium on which the program is recorded have the same content as the above-described transmission line accident location device.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 is a transmission line voltage / current data transmission path diagram, FIG. 2 is a system diagram showing the transmission line, FIG. 3 is a block diagram of a transmission line fault location device, and FIG. 4 is a transmission line accident point processed by the device. FIG. 5 is a current waveform diagram of measured current data, FIG. 6 is a waveform diagram of current shunt ratio, FIG. 7 is a waveform diagram of averaged current shunt ratio, and FIG. 8 is a virtual current shunt using a system simulator. FIG. 9 is a diagram for explaining the method of searching for the ratio, FIG. 9 is a diagram for explaining the contents of the graph data showing the relationship between the virtual fault point and the current shunt ratio (virtual current shunt ratio), and FIG. Waveform diagram for each accident cause, FIG. 11 is a diagram showing the harmonic content of the accident current for each accident cause, and FIG. 12 is a diagram showing an example of displaying and outputting the fault point of the single-line ground fault and the cause of the accident. FIG. 13 shows the relationship between the virtual accident point and the virtual current shunt ratio. FIG. 14 is a table for explaining a method for correcting rough data, FIG. 14 is a table showing the error of location of the accident point of the apparatus, and FIG. 15 is a table showing an accuracy rate of the cause of the accident at the accident point of the apparatus. It is.
[0023]
In the voltage / current data transmission path of the transmission line shown in FIG. 1, 2 is an automatic oscillograph device placed at a substation, 3 is a communication control device placed at a control station, and 4 is placed at a branch or power station. The communication control device 5 is an oscilloscope waveform analysis device 1 disposed at a branch office or the like, and 1 is a transmission line accident point locating device. Measured voltage / current data, etc. of voltage / current of transmission line α input through the LAN line are sequentially recorded.
[0024]
The measured voltage / current data and the like (measured data) of the 77 kV transmission line α (in this case, a parallel two-line transmission line) output from the automatic oscillograph apparatus 2 is obtained through the dedicated line and the LAN line. 5 and the transmission line accident point locator 1 are sequentially input. When a single-line ground fault occurs, if the power transmission line fault locating device 1 is used, the fault point and the like can be immediately identified.
[0025]
Here, an example in which the transmission line α is a four-terminal system as shown in FIG. 2 will be described. The power transmission end of the transmission line α corresponds to the A substation in which the automatic oscillograph device 2 is installed. The transmission voltage of the A substation is V1, and the installation location is shown as point a. The B substation, the C substation, and the D substation are connected to the A substation via the transmission line α, and each of them is a receiving end. In the figure, b, c, and d indicate the installation locations of the B, C, and D substations, while e and f in the figure indicate the first and second branch points on the transmission line α.
[0026]
The transmission line α is composed of a line 1L and a line 2L. Due to the difference in line impedance, the section L1 (between a and e), the section L2 (between ef), the section L3 (between f and b), and the section L4 (e− c)), and is divided into sections L5 (between f-d). In the drawing, it is shown that a one-line ground fault has occurred in the line 1L on the section L1 of the transmission line α. Phase voltages on the lines 1L and 2L at the first branch point a are shown as V2 and V3, while phase voltages on the lines 1L and 2L at the second branch point b are shown as V5 and V6. Then, the phase voltage at the single-line ground fault point is set to V_FAs shown.
[0027]
Assuming that the section L1 also indicates its length, the distance from the point a to the single-line ground fault point is indicated by k · L1, while the distance from the single-line ground fault point to the point e is (1−k) · L1. Indicated by However, k is a current shunt ratio described later.
[0028]
The power transmission line accident point locating apparatus 1 listed here is a personal computer connected to a LAN line as shown in FIG. 1, and its basic configuration is as shown in FIG. The personal computer is preinstalled with the existing system simulator software and the transmission line accident location program shown in FIG. By executing these software, it is possible to determine the accident point of the one-line ground fault of the transmission line α using the current shunt ratio method.
[0029]
The transmission line fault locating device 1 includes a memory 50 for sequentially recording the voltage / current measured voltage / current data and the like of the transmission line α input through the LAN line, and the measured current data (the fault current flowing in the line 1L (here) Let the magnitude of the instantaneous value of the zero-phase current) be I₀₁, The magnitude of the instantaneous value of the fault current (zero phase current in this case) flowing in the line 2L₀₂Current splitting ratio k (k = 2I)₀₂/ (I₀₁+ I₀₂) For each instantaneous value, and the current shunt ratio calculation unit 10 that averages the current shunt ratio k for the determined predetermined cycle (here, four cycles) by filtering and the current shunt ratio calculation unit 10 Averaged current shunt ratio k ′ (k ′ = Σk × (I₀₁+ I₀₂)²/ Σ (I₀₁+ I₀₂)²) Based on the accident location unit 20 for locating the accident point of the one-line ground fault, the display panel 30 for displaying and outputting the orientation result of the accident location unit 20, the actual specific accident point of the one-line ground fault, etc. The basic configuration includes an input unit 40 such as a keyboard for inputting. Hereinafter, each component will be described in detail.
[0030]
In the memory 50, the transmission line accident location program shown in FIG. 4 is recorded in advance together with the system simulator software. The flow of the transmission line accident point location program will be described later, but when this is executed, the functions of the current shunt ratio calculation unit 10 and the accident location unit 20 are exhibited.
[0031]
The contents of the calculation performed in the current shunt ratio calculation unit 10 are as follows. FIG. 5 shows the fault current I of the transmission line α before and after the occurrence of the single-line ground fault.₀₁, I₀₂The current waveform is shown. Such an accident current I₀₁, I₀₂Based on the measured current data, current shunt ratio k is calculated for each instantaneous value. FIG. 6 shows this calculation result. Then, in order to eliminate the protruding portion of the waveform of the current shunt ratio k, a filtering process is performed using a square weighted moving average. That is, the average current shunt ratio k ′ is calculated based on the current shunt ratio k in the period T corresponding to the four cycle period after the occurrence of the one-line ground fault. FIG. 7 shows the calculation result.
[0032]
The accident location unit 20 uses an existing system simulator having a function capable of calculating the current flowing through the power transmission end in the event of a one-line ground fault. That is, a single-line ground fault is caused in the transmission line α using the system simulator, and the fault current I₀₁, I₀₂To simulate. As this premise, it is assumed that the lengths of the sections L1 to L5, the line impedance, and the like are input in advance through the input unit 40 and are initially set. The system simulator initially set in this way is shown as a system simulator 21 in FIG.
[0033]
The accident location unit 20 uses the system simulator 21 to assume that a one-line ground fault has occurred in the transmission line α and to calculate virtual current data (the virtual accident current of the line 1L is I₀₁'The virtual accident current of line 2L is I₀₂′) And the virtual current shunt ratio K (= 2I) from the virtual fault current data.₀₂’/ (I₀₁'+ I₀₂'), And the virtual current shunt ratio K corresponding to the virtual fault point and the average current shunt ratio k' obtained by the current shunt ratio calculating unit 10 are sequentially changed while changing the virtual fault point on the system simulator. In contrast, the virtual current shunt ratio K that is closest to each other is searched for, and the virtual accident point corresponding to this virtual current shunt ratio K is configured as the fault point of the one-line ground fault. . This will be described in more detail below.
[0034]
In the case of a one-line ground fault in the transmission system shown in FIG. 2, the virtual current shunt ratio K and the virtual current I₀₁’、 I₀₂The relationship with ′ is expressed by the following equation.
I₀₁'= (V1-V_F) / K ・ L1
I₀₂'= (V1-V3) / L1
[0035]
V1, V_F, V3 is obtained by the system simulator 21, and L1 is a constant, so if K is a parameter, the virtual current I₀₁’、 I₀₂'Can be calculated by the above equation.
[0036]
On the other hand, since the average current shunt ratio k ′ is obtained by filtering the current shunt ratio k, assuming that both values are equivalent, the average current shunt ratio k ′ and the virtual current I₀₁’、 I₀₂The relationship with 'is k' = 2I₀₂’/ (I₀₁'+ I₀₂′).
[0037]
In other words, a one-line ground fault is virtually generated using the system simulator 21, and the average current shunt ratio k ′ at the transmission end of the power transmission system shown in FIG. Search for the matching virtual current shunt ratio K.
[0038]
Specifically, the virtual fault point is moved at intervals of 10% of the line length of the line on the power transmission system sections L1 to L5 shown in FIG. And the average current shunt ratio k ′ obtained by the current shunt ratio computing unit 10 are sequentially compared. As shown in FIG. 8, when the virtual current shunt ratio K exceeds the average current shunt ratio k ', the process returns by one step, and the virtual accident point is moved by a smaller step size of 1%. Further, the virtual accident point is moved with a finer step size as necessary. If the virtual current shunt ratio K moves away from the average current shunt ratio k 'even if searching on the same line, the search for that line is stopped and the search for the next line is performed in the same manner. The virtual current shunt ratio K closest to the average current shunt ratio k ′ is obtained by such a search, and the virtual fault point corresponding to the virtual current shunt ratio K at this time is determined as the fault point of the actual one-line ground fault. .
[0039]
The orientation results obtained in this way are converted into a predetermined format, recorded in the memory 50, and output to the display panel 30. FIG. 9 shows an example of the display screen of the display panel 30 at this time. The vertical axis of the graph of the display screen indicates the distance m (virtual accident point) from the point a, while the horizontal axis indicates the current shunt ratio k (or the average current shunt ratio k ′, the virtual current shunt ratio K). Is shown.
[0040]
Graph 1 shows the relationship between the distance on section L1 and current shunt ratio k, while graphs 2, 3, 4, and 5 show the relationship between the distance on section L2, 3, 4, 5 and current shunt ratio k. Respectively.
[0041]
For example, assuming that the virtual current shunt ratio K closest to the averaged current shunt ratio k ′ obtained by the current shunt ratio calculation unit 10 is K (p), the virtual accident point at this time is m1. . This means that a one-line ground fault has occurred on the line L1 at a distance m1 from the substation A. Assuming that the virtual current shunt ratio K is K (q), the virtual accident point at this time is m2 or m3. This means that there are two virtual accident point candidates, and a one-line ground fault has occurred on the line L2 at a distance m3 from the substation A or the line l4 at a distance m2.
[0042]
In the memory 50, not only such fault location determination results but also data of the graph shown in FIG. 9 obtained in a series of simulations, that is, the virtual fault point and virtual current shunt ratio K of the transmission line α. Data indicating the relationship is also recorded.
[0043]
The accident location unit 20 has not only a function of locating the accident point, but also a function of locating the cause of the accident. That is, the waveform basic data of the ground fault current at the time of the one-line ground fault is prepared in advance in the memory 50 for each cause of the fault, and the waveform basic data closest to the current waveform included in the measured current data of the transmission line α is searched, The configuration has a function of locating the cause of the accident corresponding to the waveform basic data as the cause of the one-line ground fault. This will be described in more detail below.
[0044]
When the cause of the fault is a tree contact, the ground fault current generated at the time of a one-line ground fault has a large distortion of the waveform of the first wave as shown in FIG. In many cases, the waveform is unique. In the case of a lightning strike, the waveform itself is often stable because it is a high frequency that cannot be observed at the sampling frequency of the automatic oscillograph 2 even if a harmonic is generated as shown in FIG. In the case of contact with birds and beasts, as shown in FIG. 10 (c), the waveform distortion is large at the start of the accident, and this often continues for several cycles.
[0045]
In this way, the ground fault current generated at the time of a single-line ground fault often has a unique waveform for each cause of the fault, so the magnitude of the harmonic component contained in the ground fault current is a waveform for each cause of the fault. It is recorded in advance in the memory 50 as basic data.
[0046]
FIG. 11 shows an example of waveform basic data. The analysis position here indicates the position of the waveform analysis for which cycle of the ground fault current. That is, in the case of analysis position (1), with regard to the waveform of the first cycle of the ground fault current, when the cause of the accident is lightning strike, the content rate of the third to seventh and eleventh to fifteenth harmonic components Is 0%, 0%, and when the animal is in contact with birds and animals, the third to seventh, 11th to 15th harmonic content is 10%, 1%. It shows that the content ratios of the ˜7th and 11th˜15th harmonic components are 5% and 2%. The same applies to the analysis positions (2) to (4).
[0047]
The accident location unit 20 reads the measured current data of the transmission line α from the memory 50, performs Fourier transform etc. on the measured current data for several cycles at the time of occurrence of the one-line ground fault, and determines the magnitude of the harmonic component, etc. On the other hand, the waveform basic data recorded in the memory 50 is read out, both data are compared for each analysis position and harmonic component, and finally the waveform basic data closest to the current waveform included in the actual measurement data is searched for. Assume that the cause of the accident corresponding to the waveform data is the cause of the accident of this one-line ground fault. For example, the accident current I at the time of the accident₀₁When the current waveform is closest to the waveform of the ground fault current shown in FIG. 10 (a), the tree contact is determined as the cause of the accident. Similarly, when it is closest to the waveform of the ground fault current shown in FIG. 10 (b) or (c), the electric shock or the contact of birds and beasts is determined as the cause of the accident.
[0048]
The cause of the one-line ground fault that has been standardized in this way is converted into a predetermined format, recorded in the memory 50, and output to the display panel 30. FIG. 12 shows an example of the display screen of the display panel 30 at this time. On this screen, in addition to the cause of the accident, the accident point location results are also displayed.
[0049]
Further, when the actual specific accident point of the one-line ground fault is input through the input unit 40, the accident location unit 20 and the virtual current branching ratio K of the virtual accident point of the transmission line α recorded on the memory 50 according to the actual fault point are recorded. The data indicating the relationship is corrected and rewritten.
[0050]
That is, the memory 50 is passed through the intersection of the specific fault point input through the input unit 40 and the averaged current shunt ratio k ′ (or virtual current shunt ratio K) obtained with the one-line ground fault. After correcting the data of the retained graph, the average current shunt ratio obtained by the current shunt ratio calculation unit 10 with reference to the data of the graph after correction in locating the accident point of the single-line ground fault is obtained. A configuration has a function of obtaining a virtual accident point related to k ′ and locating it as an accident point of the one-line ground fault. Details will be described below.
[0051]
FIG. 13 is a display screen of the display panel 30 corresponding to FIG. 9 showing the result of locating the accident point by performing a simulation or the like on the other power system different from the power system shown in FIG. That is, the vertical axis of the graph of the display screen indicates the distance (virtual accident point) from the power transmission end, while the horizontal axis indicates the current shunt ratio k (or the average current shunt ratio k ′, the virtual current shunt ratio K). Is shown.
[0052]
For example, assuming that the virtual current shunt ratio K closest to the averaged current shunt ratio k ′ obtained by the current shunt ratio calculation unit 10 is K (r), the virtual accident point at this time is 8.40 [km] and That would be 13.19 [km]. In the memory 50, data such as graphs 6 and 7 obtained in a series of simulation processes are recorded in the same manner as described above. While the graph 6 is a straight line passing through the intersection of the virtual current shunt ratio K (r) and the virtual fault point 13.19 [km], the graph 7 is a virtual current shunt ratio K (r) and the virtual fault point 8.40. It is a straight line that passes through the intersection with [km].
[0053]
It is assumed that the actual ground fault accident site was patroled with reference to the result of the location of the accident point, and as a result, the virtual accident point 13.19 [km] was actually 12.539 [km]. When 12.539 [km] is input through the input unit 40 as an actual specific accident point, the data of the graph 6 on the memory 50 is corrected and rewritten to the data of the graph 6 'indicated by the broken line in the drawing. The graph 6 'is a straight line passing through the intersection of the virtual current shunt ratio K (r) and the specific accident point 12.539 [km]. On the other hand, the data of the graph 7 on the memory 50 is automatically corrected based on the data of the actual specific accident point because the distance from the transmission end of each substation and branch point does not change. Is rewritten to the data of the graph 7 ′ shown in FIG. In addition, the mark of * in the figure has shown the specific accident point of the one-line ground fault.
[0054]
After that, the accident location unit 20 uses the graph data recorded in the memory 50 to locate the accident point without using the system simulator 21 as long as the target to be standardized is the same power transmission system. ing. That is, the virtual fault point corresponding to the virtual current shunt ratio K that matches the averaged current shunt ratio k ′ obtained by the current shunt ratio calculation unit 10 is obtained by referring to the graph data on the memory 50. The virtual accident point is determined as the accident point of the one-line ground fault. Thereafter, in the same manner as described above, the orientation result is recorded in the memory 50 and displayed on the display panel 30 as shown in FIG.
[0055]
Hereinafter, the flow of the transmission line accident location program processed in the transmission line accident location system 1 will be described with reference to FIG. First, when voltage / current measurement data for two lines of the power transmission line α are input through the LAN line (S1), an average current shunt ratio k ′ is calculated together with the current shunt ratio k (S2).
[0056]
When it is input through the input unit 40 that a single-line ground fault has occurred, or when it is automatically determined based on voltage measurement data that a single-line ground fault has occurred based on a sudden change in voltage, the system simulator 21 Is operated to virtually generate a one-line ground fault, and the virtual current shunt ratio K that matches the average current shunt ratio k ′ is obtained while moving the fault point (S3, S4). The fault point of a single-line ground fault is determined from the calculated virtual current shunt ratio K, while the cause of the fault is determined based on the current waveform included in the current measurement data, and graph data obtained during the simulation process, etc. Is recorded in the memory 50, and the orientation result and the like are displayed and output on the display panel 30 in the format selected through the input unit 40 (S5).
[0057]
When an actual specific accident point is input through the input unit 40 (S6), the graph data recorded in the memory 50 is corrected (S7). Thereafter, in locating the accident point of the single-line ground fault, it is performed with reference to the graph data recorded in the memory 50 as described above.
[0058]
In the case of the transmission line accident point locating device 1 configured as described above, the current shunt ratio k is obtained for each instantaneous value from the measured current data of the transmission line α, and the obtained current shunt ratio k for four cycles is obtained. Since it is configured to perform filtering and averaging (here, a weighted moving average of squares) and to determine the fault point based on the average current shunt ratio k ′, unlike the conventional example, The circuit 1L or 2L is hardly affected by the circulating current existing before the accident, the disturbance of the current waveform at the time of the accident and the current phase difference. Specifically, since the average current shunt ratio k ′ is not affected by the circulating current, the disturbance of the current waveform at the time of the accident, and the current phase difference and is stable from the accident start point, it is shown in FIG. As shown in the figure, it was confirmed that the accident location error was reduced to about 1/3 of the conventional method.
[0059]
The orientation error in FIG. 14 is a numerical value represented by the following equation.
Orientation error = (accident location result-inspection result) / inspection result x 100 (%)
[0060]
In this way, it has become possible to locate the accident point of a single-line ground fault with high accuracy, and as a result, the time required to find the accident point of the transmission line α can be greatly reduced. .
[0061]
For example, assume that the 77kV transmission line is 10km long, the average span is 250m, the accident point is 7km from the substation, and it takes 10 minutes to move between the spans and 20 minutes to check the tower. To do. As shown in FIG. 14, in the case of the conventional method, since the orientation error was 24%, the range corresponding to about 13 diameters from ± 1.58 km from the true accident point should be circulated. However, in the case of the proposed method, since the positioning error is 9%, it is necessary to go around ± 0.63km from the true accident point, and the range corresponding to about 5 spans between spans. become. The specific time required for patrol can be shortened by 50 minutes (10 minutes x 5) compared to the conventional method in the case of a lightning accident. 30 minutes (10 minutes × 5 + 20 minutes × 5) can be shortened.
[0062]
In addition, after the occurrence of a one-line ground fault, the worker goes directly to the site with reference to the accident point location result obtained by the transmission line accident point location device 1, and finally the accident point is identified, and the actual specific accident point is identified. Is input through the input unit 40, the graph data on the memory 50 is automatically corrected as described above. This means that the line constant error of the transmission line α, the instrument current transformer error, and the like are corrected together. Since the accident point is then determined using the corrected graph data, the accident point localization accuracy will be further increased if the apparatus is used continuously.
[0063]
Most local transmission lines with no fault locator installed at 77kV or lower have a system with 4 terminals or more, but the transmission line fault location system 1 makes good use of existing system simulators. For this reason, even if there are more than 8 terminals, it is possible to determine the accident point with high accuracy and very easily. The essential drawbacks of the current shunt ratio method were that the accuracy of fault location was low and that it was not possible to deal with more than four terminals, but these two drawbacks can be drastically solved. It was.
[0064]
In addition, as shown in FIG. 15, the accuracy rate of the cause of a single-line ground fault is very high, enabling not only early detection of the accident point but also early response, which in turn leads to the trust of the power business. There is great significance in improving sex.
[0065]
Further, here, a personal computer is used as the power transmission line accident location system 1, and not only can anyone easily operate, but also the existing system simulator software and the software shown in FIG. 4 are installed. As such, it does not lead to a significant increase in cost, and there is a merit in this respect as well.
[0066]
When the ground fault voltage generated at the time of a one-line ground fault shows a unique waveform depending on the cause of the fault, the fault is exactly the same as the case of the ground fault current using the measured voltage data, not the measured current data of the transmission line α. The cause may be determined.
[0067]
Hereinafter, a first modification of the first embodiment described above will be described with reference to FIGS. FIG. 16 is an enlarged waveform diagram of the current shunt ratio, FIG. 17 is a flowchart for explaining a method for searching for a stable section of the current shunt ratio, and FIG. 18 is a schematic waveform diagram of the current shunt ratio for explaining the method. is there.
[0068]
In the first embodiment, when the average current division ratio k ′ is obtained by the current division ratio calculation unit 10, the current division ratio k in the period T corresponding to the four-cycle period after the occurrence of the one-line short-circuit accident is averaged. The method was adopted. However, the current shunt ratio k may not maintain a stable value during the duration of the accident, and if the period T after the occurrence of a one-line short-circuit accident is fixed uniformly, the fault location accuracy may be reduced. Become.
[0069]
Therefore, a method of obtaining the amount of change in the current shunt ratio k after the occurrence of the one-line short circuit accident, searching for the stable section Ts having the smallest change amount and a long period, and averaging the current shunt ratio k in the stable section Ts. Use. That is, the average current shunt ratio k ′ is obtained using the current shunt ratio k in the stable section Ts, not the period T after the occurrence of the one-line short circuit accident, as in the above embodiment. A specific search method for the stable section Ts is as shown in FIG.
[0070]
First, after a one-line short circuit accident occurs, a graph of the current shunt ratio k over the duration of the accident is differentiated (S1). The value of the differentiated graph indicates the amount of change in the current shunt ratio k. The graph is sampled, and a section in which the difference in current shunt ratio k per sample is dk (here, 0.001 is set as an initial value) or less is searched (S2). For example, if the graph of the current shunt ratio k has a waveform as shown in FIG. 16, sections T1 to T4 in which the amount of change in the current shunt ratio k is small are searched.
[0071]
Then, an evaluation function value (= t / d: t is a time width of the searched section and d is a fluctuation width of the current shunt ratio k in the same section) is calculated for each searched section, and the largest evaluation is performed. A section having a function value is searched (S3). For example, in the example shown in FIG. 16, the section T4 having the smallest change amount and the long period among the searched sections T1 to T4 is selected.
[0072]
However, for the section where | dividing ratio | <0.05, | dividing ratio |> 1.95, and the section after the first three cycles from the start of the accident, the evaluation function value is stable because the current is stabilized by CB interruption. It is handled by setting it to zero. Also, the section whose time width is less than or equal to 0.5 cycle equivalent value of AC waveform is excluded from selection.
[0073]
Thereafter, the set value of dk is incremented by 0.001, and unless the set value of dk indicates 0.01, the process returns to step 2 and the same processing as described above is repeated. That is, dk is sequentially incremented from 0.001 to 0.009, and an interval having the largest evaluation function value is searched in this process. When the set value of dk becomes 0.01, this iterative process ends (S5).
[0074]
The section finally obtained in this way is a stable section Ts in which the amount of change in the current shunt ratio k is small and the period is long. For example, when the graph of the current shunt ratio k has a waveform as shown in FIG. 18A, the section T7 of the sections T5, T6, and T7 has a waveform as shown in FIG. Section T of T5, T6, T75Are finally selected as stable sections Ts.
[0075]
In the case of the first modification described above, the stable section Ts after the occurrence of the one-line short circuit accident is automatically obtained, and thereafter the average current shunt ratio k ′ is obtained using the data of the current shunt ratio k in the stable section Ts. Therefore, as a result, it is possible to improve the performance of the apparatus in that the location accuracy of the accident point is not affected by the influence of the accident cause and the like, and high orientation accuracy is always obtained.
[0076]
Next, a second modification of the first embodiment described above will be described. In the embodiment described above, the transmission line α has two lines, lines IL and 2L, and this is an example of locating the accident point of the one-line ground fault that has occurred. The calculation formula used to use the current shunt ratio k in the current shunt ratio calculation unit 10 is the following formula 1 as described above. Moreover, the same formula was used also about the calculation formula which calculates | requires virtual current shunt ratio K in the accident orientation part 20. FIG.

[0077]
However, Expression 1 is an expression used when the line 1L is used as a reference. Where I_01LIs the zero-phase current of line IL, I_02LIs the zero-phase current of the line 2L. The same formula is used when the accident line is the line 2L.
[0078]
If Formula 2 is used instead of Formula 1 like this, it is possible to determine the fault point of a two-wire ground fault (two-wire short-circuit accident).

[0079]
However, Formula 2 is based on the line 1L, and is a formula used when the accident phase is a and b phases. Where I_ab1LIs the line-to-line current of line IL, I_ab2LIs the line-to-line current of the line 2L. The same formula is used when the accident line is the line 2L, and the same formula is used when the accident phases are the b and c phases.
[0080]
In this case, in the current shunt ratio calculation unit 10, a one-line ground fault is based on the measured current data between the fault phases instead of the zero-phase current at the time of the accident included in the measured data output from the automatic oscillograph 2. Similarly, the current shunt ratio k is obtained, while the accident location unit 20 uses the system simulator 21 to assume that a two-wire ground fault (two-wire short-circuit accident) has occurred in the transmission line α. It is only necessary to change the design so that the current shunt ratio K is obtained in the same manner as in the case of a one-line ground fault.
[0081]
On the other hand, if Formula 3 is used instead of Formula 1, it is possible to determine the fault point of a three-wire ground fault (three-wire short-circuit accident).

[0082]
However, Expression 3 is an expression used when the line 1L is used as a reference._11LIs the positive phase current of line IL, I_12LIs the positive phase current of line 2L.
[0083]
In this case, the current shunt ratio calculation unit 10 is the same as in the case of a one-line ground fault based on the positive phase actual current data, not the zero phase current at the time of the accident included in the actual data output from the automatic oscillograph 2. The current shunt ratio k is obtained from the virtual current data and the virtual current shunt ratio in the fault location unit 20 assuming that a three-wire ground fault (three-wire short-circuit fault) has occurred in the transmission line α using the system simulator 21. It is only necessary to change the design so that K is obtained in the same manner as in the case of a one-line ground fault.
[0084]
In order to determine the accident point using such equations 1 to 3, the measured current data at the transmission end of the accident line is indispensable (one-side oscilloscope). In this case, the main application system is the line 1L and The transmission system is a loop with the line 2L, and includes not only 77 kV or less but also a 154 kV high-voltage transmission system.
[0085]
However, for the transmission system directly grounded at 275 kV or more, since the fault current through the ground wire at the receiving end affects, the fault point of the ground fault / short-circuit fault should be determined using Formula 1 to Formula 3. I can't. When applied to such a power transmission system, the following equations 4, 5, and 6 are used instead of equations 1, 2, and 3, respectively. In order to determine the accident point using the equations 4 to 6, not only the power transmission end of the accident line but also the measured current data of the power reception end is indispensable (both ends oscilloscope).

[0086]
However, Expression 4 is an expression used when the line IL is used as a reference. Where I_01LRIs the power receiving side zero-phase current of line 1L, I_01LSIs the zero-phase current on the transmission side of line 1L, I_02LSIs the receiving-side zero-phase current of line 2L, I_01LSIs a zero-phase current on the power transmission side of the line 1L. The same formula is used when the accident line is the line 2L.

[0087]
However, Expression 5 is based on the line IL and is an expression used when the accident phases are the a and b phases. Where I_ab1LRIs the line-side current of the ab phase of the line IL, I_ab1LSIs the line-to-line current on the power reception side of line 2L, I_ab2LRIs the line-to-line current on the transmission side of line 2L, I_ab2LSIs an ab phase power transmission side line current of the line 2L. The same applies when the accident line is line 2L.formulaWhen the accident phases are b and c phases, the same formula is used.

[0088]
However, Expression 6 is an expression used when the line IL is used as a reference. Where I_1LRIs the positive phase current on the power receiving side of line IL, I_1LSIs the positive phase current on the receiving side of line 1L, I_12LRIs the positive phase current on the transmission side of line 2L, I_12LSIs the positive phase current on the power transmission side of line 2L. The same formula is used when the accident line is the line 2L.
[0089]
That is, even if it is a directly grounded power transmission system, if Equation 4 is used instead of Equation 1, a one-wire ground fault will be used, and if Equation 5 is used, a two-wire ground fault (two-wire short-circuit accident) may be used. Can be used to locate the fault points of a three-wire ground fault (three-wire short-circuit accident) exactly as in the case of a one-wire ground fault. In this case, the present invention can also be applied to an ultra high voltage power transmission system of 275 kV or higher.
[0090]
Note that, according to the second modification, as described above, it is possible to locate various ground faults or short-circuit accident points of the two-line transmission line, but the same method as in the first embodiment. It is natural that the cause of the accident can be determined using Even in the case of a short circuit accident, for example, a waveform peculiar to the short circuit current or short circuit voltage included in the measured data of the wire α appears due to, for example, the cause of the contact of the wire or the cause of adhesion of ice and snow. It is possible to determine the cause of the accident using the same method as in the case of a one-line ground fault. Further, it is natural that the average current shunt ratio k ′ can be obtained using the data of the current shunt ratio k in the stable section Ts after the occurrence of the accident using the same technique as that of the first modification.
[0091]
Hereinafter, the second embodiment will be described with reference to FIG. FIG. 19 is a block diagram of a power transmission line accident point locating device according to the embodiment. In the first embodiment, including the first and second modifications, the fault point of the ground fault / short-circuit accident of the transmission line is determined using the current shunt ratio method. The transmission system to be applied by the current shunt ratio method is two lines, and one line is not applicable due to its nature. In order to apply a single-line power transmission system to the application target, it is preferable to use the power transmission line accident location system 100 shown in FIG. 19 (see FIG. 1).
[0092]
The transmission line accident point locating device 100 described here is a device having a function of locating an accident point of a ground fault or short circuit accident of a transmission line using an impedance method, and is based on actually measured data of the transmission line. The impedance calculation unit 60 calculates the impedance k for each instantaneous value and averages the impedance k for a predetermined period after the occurrence of the accident, and the ground fault based on the averaged impedance k ′ calculated by the current shunt ratio / impedance calculation unit 60. And an accident location unit 70 for locating the accident point of the accident or short circuit accident. Unlike the current shunt ratio calculation unit 10 of the first embodiment, the impedance calculation unit 60 needs to input measured voltage data in addition to the measured current data at the power transmission end of the fault line (one-end oscilloscope). ). Note that components that are the same as those in the first embodiment are assigned the same component numbers, and descriptions thereof are omitted.
[0093]
The impedance calculation unit 60 obtains the impedance k by applying the following calculation formula to the measured current data and the measured voltage data. The difference from the current shunt ratio calculation unit 10 is only the calculation formula for obtaining the impedance k, and the method for obtaining the averaged impedance k ′ is exactly the same as in the first embodiment or the first modification. Therefore, the description thereof is omitted.
[0094]
The accident location unit 70 uses the system simulator 71 to obtain virtual current data and virtual voltage data on the assumption that a ground fault or short circuit accident has occurred in the transmission line, obtains a virtual impedance K from the data, and obtains a system simulator 71, the virtual impedance K corresponding to the virtual accident point and the averaged impedance k ′ are sequentially compared while changing the virtual accident point on 71, thereby searching for the closest virtual impedance K, and the virtual impedance K The basic configuration is such that the corresponding virtual accident point is determined as the accident point of the ground fault or short circuit accident. The only difference from the accident orientation unit 20 is the calculation formula for obtaining the virtual impedance K. Since the method of finally locating the matter points from the virtual impedance K is exactly the same as in the case of the first embodiment, the description thereof is omitted.
[0095]
The calculation formula for obtaining the impedance k by the impedance calculation unit 60 is as follows. Moreover, the virtual impedance K is calculated | required in the accident orientation part 70 using the same formula.
[0096]
When locating the accident point of the single-line ground fault, Formula 7 is used instead of Formula 1 used in the first embodiment.
[Formula 7]
k = Im {V_a/ I₀}
[0097]
However, Formula 7 is a formula used when the accident phase is phase a.kIs the zero-phase reactance and V_aIs the phase voltage of phase a, I₀Is a zero-phase current. The same formula is used when the accident phase is b or c phase.
[0098]
When locating the accident point of the two-wire ground fault or the two-wire short-circuit accident, Equation 8 is used instead of Equation 2 used in the second modification of the first embodiment.
[Formula 8]
k = 2 ・ Im {(V_a-V_b) / (I_a-I_b)}
[0099]
However, Expression 8 is an expression used when the accident phases are a and b phases. In the same formulakIs the ab phase line reactance, V_aIs the phase voltage of phase a, V_bIs phase voltage of b phase, I_aIs the phase current of phase a, I_bIs the phase voltage of b phase. The same formula is used when the accident phases are b and c phases.
[0100]
When locating an accident point of a three-wire ground fault or a three-wire short-circuit accident, Equation 9 is used instead of Equation 3 used in the second modification of the first embodiment.
[Formula 9]
k = Im {V₁/ I₁}
[0101]
Where k is the positive phase reactance and V₁Is the positive phase voltage, I₁Is the positive phase current.
[0102]
The functions of the impedance calculation unit 60 and the accident location unit 70 are realized by executing the transmission line accident point location program recorded in the memory 50 shown in FIG. This is the same as the case of the embodiment.
[0103]
In the case of the transmission line accident point locating device 2 configured as described above, compared to the transmission line accident point locating device 1, only the difference in whether the fault point locating method is the current shunt ratio method or the impedance method is used. Yes, including the case where the first modification is applied in the same manner, the functions and the like are exactly the same. Conventionally, when the fault point is located using the impedance method, the same disadvantages as in the case of the current shunt ratio method have been encountered. Therefore, the same effect as in the case of the first embodiment is obtained.
[0104]
However, in the case of the first embodiment, including the second modification, the transmission system is not applicable to two lines that are not looped. The present invention can also be applied to a transmission system that is a line and is not in a loop. That is, even if two transmission lines are not in a loop, as long as the accident phase actual measurement data is used, a one-line ground fault using Formula 7 and a two-line ground fault using Formula 8 Short circuit accident), and another effect is achieved in that it is possible to locate the accident points of the three-wire ground fault accident (three-wire ground fault accident) using Equation 9.
[0105]
Hereinafter, the third embodiment will be described with reference to FIGS. 20 and 21. FIG. FIG. 20 is a block diagram of a power transmission line accident point locating device according to the embodiment.
[0106]
In the first and second embodiments, including the second modified example, the applied power transmission system and the accident aspect were basically limited to one, but all the above-described When making it applicable to a power transmission system and an accident aspect, it is good to use the power transmission line accident point location apparatus 200 shown in FIG. 20 (refer FIG. 1).
[0107]
In addition, the power transmission line fault location device 200 is installed in all substations and the like including the actual measurement data of the power transmission line α measured by the automatic oscilloscope device 2 installed in the substation as shown in FIG. It is assumed that the measured data of the transmission line measured by the automatic oscillograph device outside the figure is transferred including the transmission line data indicating the installation location of the automatic oscillograph device.
[0108]
The transmission line accident point location apparatus 200 listed here is an apparatus having a function of locating an accident point of a ground fault / short-circuit accident of a transmission line using a current shunt ratio method or an impedance method. A current shunt ratio / impedance calculator 81 that obtains the current shunt ratio k or impedance k for each instantaneous value based on the measured data of the transmission line and averages the current shunt ratio k or impedance k for a predetermined period after the occurrence of the accident; An accident location unit 82 for locating the fault point of the ground fault / short-circuit accident based on the average current shunt ratio k ′ or the average impedance k ′ obtained by the shunt ratio / impedance calculation unit 80; Measured data and line information of the corresponding transmission line prepared in advance (here, number of lines, whether it is a direct grounding system, if one line, whether it is a looped system, etc.) Of the accident (here, one-line transmission line, two-line transmission line in a loop, two-line transmission line not in a loop, two-line transmission line in a direct grounding system) And an accident aspect determination unit 83 that determines a one-wire ground fault, a two-wire ground fault (two-wire short circuit), a three-wire ground fault (three-wire short circuit), and the like.
[0109]
Note that components that are the same as those in the first and second embodiments are denoted by the same component numbers and description thereof is omitted, but the memory information shown in FIG. It is assumed that each data is recorded in advance.
[0110]
Here, the accident aspect determination unit 83 detects the occurrence of an accident based on the input actual measurement data of the transmission line, and when the occurrence of the accident is detected, searches the memory 50 and includes the transmission line included in the actual measurement data. The line information corresponding to the data is read, and the accident aspect of the accident is determined based on the read line information and the measured data.
[0111]
The current shunt ratio / impedance calculation unit 81 combines the functions of the current shunt ratio calculation unit 10 and the impedance calculation unit 60 of the first and second embodiments (including the first modification). In calculating the current shunt ratio k or the impedance k based on the data, the calculation formula corresponding to the determination result of the accident aspect determination unit 83 is used.
[0112]
That is, when the one-line ground fault, the two-line ground fault (two-line short circuit), and the three-line ground fault (three-line short circuit) in the two-line transmission line in which the determination result of the accident aspect determination unit 83 is a loop are respectively expressed by Equation 1 , Equation 2 and Equation 3 are used to calculate the current shunt ratio k (current shunt ratio method, one-end oscilloscope). On the other hand, a single-wire ground fault, a two-wire ground fault (two When a line short-circuit) and a three-wire ground fault (three-wire short-circuit) are shown, the impedance k is calculated using the equations 7, 8, and 9, respectively (impedance method). In addition, when indicating a one-wire ground fault, a two-wire ground fault (two-wire short-circuit), and a three-wire ground fault (three-wire short-circuit) in a direct grounding two-line transmission line, respectively, formula 4, formula 5, and formula 6 are used. When the current shunt ratio k is calculated (current shunt ratio method, both-end oscilloscope), and a one-wire ground fault, a two-wire ground fault (two-wire short-circuit), and a three-wire ground fault (three-wire short-circuit) are shown, The impedance k is calculated using Equation 7, Equation 8, and Equation 9 (impedance method).
[0113]
The accident location unit 82 combines the functions of the accident location unit 20 and the accident location unit 70 of the first and second embodiments, and the virtual current shunt ratio K or the virtual current data and / or virtual voltage data In calculating the virtual impedance K, the calculation formula corresponding to the determination result of the accident aspect determination unit 83 is used.
[0114]
That is, when the one-line ground fault, the two-line ground fault (two-line short circuit), and the three-line ground fault (three-line short circuit) in the two-line transmission line in which the determination result of the accident aspect determination unit 83 is a loop are respectively expressed by Equation 1 , Equation 2 and Equation 3 are used to calculate the virtual current shunt ratio K in the same manner, while a one-wire ground fault, a two-wire ground fault (two-wire short circuit), and a three-wire ground in a two-line transmission line that is not in a loop. When each of the tangles (three-wire short-circuit) is indicated, the virtual impedance K is calculated in the same manner using Equation 7, Equation 8, and Equation 9, respectively. In addition, when indicating a one-wire ground fault, a two-wire ground fault (two-wire short-circuit), and a three-wire ground fault (three-wire short-circuit) in a direct grounding two-line transmission line, respectively, formula 4, formula 5, and formula 6 are used. When the virtual current shunt ratio K is calculated in the same manner, and a one-wire ground fault, a two-wire ground fault (two-wire short-circuit), and a three-wire ground fault (three-wire short-circuit) are shown for one-line transmission line, respectively, The virtual impedance K is calculated in the same manner using Equation 9 respectively.
[0115]
The functions as the current shunt ratio / impedance calculation unit 81, the accident location determination unit 82, and the accident aspect determination unit 83 are realized by executing the transmission line fault point location program recorded in the memory 50 shown in FIG. This is the same as in the first and second embodiments.
[0116]
In the case of such a transmission line accident point location device 200, it is possible to locate accident points in all cases regardless of the transmission system and the aspect of the accident, and branch offices that implement or command accident recovery when a transmission line accident occurs It is very convenient to use at power stations and power plants, and it is possible to improve the performance of the device in these respects.
[0117]
Hereinafter, an example of a transmission line accident point location program processed by the transmission line accident point location apparatus 200 will be described with reference to FIG. The program does not automatically handle accident point location when a transmission line accident occurs, but is semi-automated in terms of detecting the occurrence of an accident and selecting an accident point location method. It is a simple type that can obtain orientation information and the like.
[0118]
First, when the transmission line accident point locating device 200 is started, a list of transmission line data and the like of transmission lines that can be fault pointed is displayed on the display 30 (S1).
[0119]
When the holder information registration command is selected and input through the input unit 40 (S2), information on the power transmission system to be newly applied (system configuration, line length, impedance, power transmission line data, line information, etc.) Registration is performed through the input unit 40 (S3, S4, S5).
[0120]
On the other hand, when a power transmission line accident occurs in a specific power transmission line, when a power transmission line is specified through the input unit 40 and a waveform display and analysis command is selected and input (S2), the corresponding data recorded in the memory 50 The waveform of the measured data of the transmission line is displayed on the display 30 (S6), the entire section of the waveform is scanned to search for a location where the waveform is disturbed (S7), and the waveform of the measured data at the searched location is used. The accident aspect is determined, and the determination result is displayed on the display 30 (S8).
[0121]
After that, when a command for selecting the fault location method as the current shunt ratio method is input through the input unit 40 (S8), the current shunt ratio k is calculated as described above based on the actually measured data of the searched location, The waveform is displayed on the display 30 together with the waveform of the actual measurement data (S9), and the stable section Ts of the graph of the current shunt ratio k is searched as described above (S10). On the other hand, when a command for selecting the fault location method as the impedance method is input through the input unit 40 (S8), the impedance k is calculated as described above based on the actual measurement data of the searched location, and the waveform is actually measured. The data waveform is displayed on the display 30 (S12), and the stable section Ts of the impedance k graph is searched as described above (S10).
[0122]
When an accident cause orientation command is input through the input unit 40 in a state where the waveform of the actual measurement data is displayed on the display 30 (S8), the accident cause is determined as described above based on the actual measurement data of the searched location. The orientation result (see FIG. 12) is displayed on the display 30 (S11). On the other hand, when a command indicating OK is input through the input unit 40 (S8), the system simulator is activated (S13).
[0123]
When an accident point search command is input through the input unit 40 (S14), when the current shunt ratio method is selected, an average current shunt ratio k ′ is obtained from the current shunt ratio k in the stable section Ts, Based on this, an accident point is located as described above using a system simulator (S15), and the orientation result (see FIG. 12) is displayed on the display 30 (S16). On the other hand, when the impedance method is selected, the averaged impedance k ′ is obtained from the impedance k in the stable section Ts, and based on this, the fault point is determined as described above using the system simulator (S15), The orientation result (see FIG. 12) is displayed on the display 30 (S16).
[0124]
When a graph display command is input through the input unit 40 while the orientation result is displayed on the display 30 (S14), when the current shunt ratio method is selected, the fault point and the current shunt ratio k are displayed. A graph showing the relationship (see FIG. 13) is displayed on the display 30 (S17). On the other hand, when the impedance method is selected, a graph (see FIG. 13) showing the relationship between the accident point and the impedance k is displayed on the display 30 (S17).
[0125]
When another command is input through the input unit 40 (S14), processing corresponding to the command is performed (S18). When an end command is input through the input unit 40 (S14), the process jumps to step 8. Return to the command input waiting for selecting the accident location method.
[0126]
The present invention is not limited to the above-described embodiments, and the power transmission system to be applied is not limited, and the design may be changed as follows. For example, the average current shunt ratio or the average impedance may be obtained directly from the actual measurement data of the transmission line. In addition, a cycle period or the like when the current shunt ratio or impedance is filtered and averaged may be set as appropriate according to the accident duration, and any method for averaging the current shunt ratio or the like may be used. If the transmission line system is simple, the fault point may be directly determined from the average current shunt ratio or average impedance without using the system simulator. Furthermore, in calculating the current shunt ratio or impedance, the virtual current shunt ratio or virtual impedance, respectively, the accident aspect of the accident is set and input without determining the accident aspect of the accident, and the calculation formula corresponding to the setting input You may do it using.
[0127]
【The invention's effect】
As described above, in the case of the transmission line fault point locating device according to claim 1 of the present invention, the accident is not based on the current shunt ratio or the instantaneous value of the impedance but on the averaged current shunt ratio or the averaged impedance obtained by averaging them. Since the point is configured to be pointed, the accident point can be pointed with high accuracy in spite of the current shunt ratio method or the impedance method, and the performance of the apparatus can be improved.
[0128]
  Also,The existing system simulator is used to determine the relationship between the virtual fault point of the transmission line and the average current shunt ratio or average impedance, and the fault point is determined from this relationship. In contrast to this, even if the transmission line system is a complicated branch, it is possible to locate the accident point. That is, the applicable range of the current shunt ratio method or the impedance method is greatly expanded as compared with the case of the conventional example, and the performance of the apparatus can be improved in this respect.
[0129]
  Furthermore, because it is configured to automatically correct the relationship between the virtual fault point of the transmission line obtained using the system simulator and the average current shunt ratio or the average impedance by the actual specific fault point that is input, Each time the device is used, the positioning accuracy is improved. In this respect, it is possible to improve the performance of the device.
[0130]
  Claims of the invention2In the case of the transmission line accident point locating device according to the configuration, the current shunt ratio or impedance in the stable section with the smallest amount of change is averaged to obtain the average current shunt ratio or average impedance, and the fault point is located using this Therefore, the positioning accuracy is improved, and it is possible to improve the performance of the apparatus in this respect.
[0131]
  In the case of the transmission line accident point location device according to claim 3 of the present invention,Since the fault point is determined based on the average current shunt ratio or average impedance obtained by averaging the current shunt ratio or impedance instead of the instantaneous value of the current shunt ratio or impedance, the current shunt ratio method or impedance method is used. However, it is possible to locate the accident point with high accuracy and to improve the performance of the apparatus. In addition, the current shunt ratio or impedance in the stable section with the smallest amount of change is averaged to obtain the average current shunt ratio or average impedance, and the fault point is determined using this, so the positioning accuracy is It becomes possible to improve the performance of the apparatus in this respect. Furthermore, since the configuration is such that the relationship between the virtual fault point of the transmission line and the averaged current shunt ratio or averaged impedance is automatically corrected by the input actual specific fault point, each time the device is used The orientation accuracy is improved, and the performance of the apparatus can be improved in this respect.
[0132]
  Claims of the invention4In the case of the transmission line accident location system, the cause of the accident is determined from the characteristics of the current / voltage waveform included in the measured data as well as the accident point of the transmission line accident. This can be done quickly, and in this respect, it becomes possible to improve the performance of the apparatus.
[0133]
  In the case of the transmission line accident point locating device according to claim 5 of the present invention, the accident aspect of the transmission line accident is determined, and the current shunt ratio or impedance and the virtual current shunt ratio or virtual impedance are calculated using the corresponding calculation formula. Since it is configured to calculate, it becomes possible to locate all fault points of ground faults or short circuit accidents regardless of the type of transmission system and the number of lines, and the applicable range is markedly In this respect, it is possible to improve the performance of the apparatus.
[0134]
  In the case of the transmission line fault location method according to claim 6 of the present invention, the fault point is not based on the current shunt ratio or the instantaneous value of the impedance but on the averaged current shunt ratio or the averaged impedance obtained by averaging them. It is supposed to be standardized.In addition, the existing system simulator is utilized well to determine the relationship between the virtual fault point of the transmission line and the average current shunt ratio or average impedance, and the fault point is determined from the relationship. Furthermore, the relationship between the virtual fault point of the transmission line obtained by using the system simulator and the averaged current shunt ratio or the averaged impedance is automatically corrected based on the input actual specific fault point.Therefore, there is a merit similar to that of the first aspect.
[0135]
  Claims of the invention7In the case of the transmission line accident location method, the existing system simulator is used well to determine the relationship between the virtual accident point of the transmission line and the average current shunt ratio or average impedance, and the accident point is determined from the relationship. Therefore, there is a merit similar to that of the second aspect.
[0136]
  In the case of the transmission line accident location method according to claim 8 of the present invention,The fault point is determined not based on the instantaneous value of the current shunt ratio or impedance but on the basis of the averaged current shunt ratio or averaged impedance obtained by averaging them. Further, the current shunt ratio or impedance in the stable section with the smallest change amount is averaged to obtain the average current shunt ratio or average impedance, and the accident point is determined using this. The relationship between the virtual fault point of the transmission line and the averaged current shunt ratio or averaged impedance is automatically corrected by the actual specific fault point inputted.Therefore, there is a merit similar to that of the third aspect.
[0137]
  Claims of the invention9In the case of the transmission line accident point location method according to the present invention, not only the accident point of the transmission line accident but also the cause of the accident is determined from the characteristics of the current / voltage waveform included in the measured data.4Has the same merit as
[0138]
  Claims of the invention10In the case of the transmission line accident location method according to the above, the accident aspect of the transmission line accident is determined, and the current shunt ratio or impedance and the virtual current shunt ratio or virtual impedance are calculated using the corresponding calculation formula. Therefore, there is a merit similar to that of the fifth aspect.
[0139]
  In the case of the transmission line fault location program according to claim 11 of the present invention, the fault point is not based on the current shunt ratio or the instantaneous value of the impedance but on the averaged current shunt ratio or the averaged impedance obtained by averaging them. It is the content to standardize.In addition, the existing system simulator is utilized effectively to obtain the relationship between the virtual fault point of the transmission line and the average current shunt ratio or average impedance, and the fault point is determined from the relationship. Further, the relationship between the virtual fault point of the transmission line obtained using the system simulator and the averaged current shunt ratio or the averaged impedance is automatically corrected by the input actual specific fault point. Therefore, the same merit as in claim 1 is obtained.
[0140]
  Claims of the invention12In the case of the transmission line fault location program related to, average the current shunt ratio or impedance in the stable section with the smallest amount of change to obtain the average current shunt ratio or average impedance, and use this to locate the fault point Therefore, there is a merit similar to that of the second aspect.
[0141]
  In the case of the transmission line accident location program according to claim 13 of the present invention,The fault point is determined based on the average current shunt ratio or the average impedance obtained by averaging the current shunt ratio or impedance instead of the instantaneous value of the current shunt ratio or impedance. Further, the current shunt ratio or impedance in the stable section with the smallest change amount is averaged to obtain the average current shunt ratio or average impedance, and the accident point is determined using this. Further, since the relationship between the virtual fault point of the transmission line and the averaged current shunt ratio or the averaged impedance is automatically corrected by the input actual specific fault point, the same merit as in claim 3 There is.
[0142]
  Claims of the invention14In the case of the transmission line accident location program according to the present invention, not only the accident point of the transmission line accident but also the cause of the accident is determined from the characteristics of the current / voltage waveform included in the measured data.4Has the same merit as
[0143]
  Claims of the invention15In the case of the transmission line fault location program according to the above, the current shunt ratio or impedance and the virtual current shunt ratio or virtual impedance are calculated using a calculation formula corresponding to the accident aspect of the transmission line accident. Term5Has the same merit as
[0144]
  Claims of the invention16In the case of using a recording medium that records the program for locating transmission line accident points related to11Thru15The transmission line accident location program is recorded, so that it can be claimed by being processed by a computer.11Thru15The same merit can be expected.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a first embodiment of the present invention, and is a voltage / current data transmission path diagram of a transmission line.
FIG. 2 is a diagram for explaining the first embodiment of the present invention and is a system diagram of a transmission line;
FIG. 3 is a diagram for explaining the first embodiment of the present invention, and is a block diagram of a power transmission line accident point locating device.
FIG. 4 is a diagram for explaining the first embodiment of the present invention, and is a flowchart of a transmission line accident point location program processed by the apparatus;
FIG. 5 is a diagram for explaining the first embodiment of the present invention, and is a current waveform diagram of measured current data;
FIG. 6 is a diagram for explaining the first embodiment of the present invention and is a waveform diagram of a current shunt ratio.
FIG. 7 is a diagram for explaining the first embodiment of the present invention, and is a waveform diagram of an average current shunt ratio.
FIG. 8 is a diagram for explaining a first embodiment of the present invention, and is a diagram for explaining a method of searching for a virtual current shunt ratio using a system simulator.
FIG. 9 is a diagram for explaining the first embodiment of the present invention, and is for explaining the contents of graph data indicating the relationship between a virtual fault point and a current shunt ratio (virtual current shunt ratio); FIG.
FIG. 10 is a diagram for explaining the first embodiment of the present invention, and is a waveform diagram for each cause of an accident current.
FIG. 11 is a diagram for explaining the first embodiment of the present invention, and shows the harmonic content of the accident current for each cause of the accident.
FIG. 12 is a diagram for explaining the first embodiment of the present invention, and is a diagram showing an example of displaying and outputting an accident point of a one-line ground fault and an orientation result of the cause of the accident.
FIG. 13 is a diagram for explaining the first embodiment of the present invention, and is a diagram for explaining a method of correcting graph data indicating a relationship between a virtual fault point and a virtual current shunt ratio. is there.
FIG. 14 is a diagram for explaining the first embodiment of the present invention, and is a table showing an orientation error and the like of an accident point of the same device.
FIG. 15 is a table for explaining the first embodiment of the present invention, and is a table showing the correct answer rate of the cause of the accident at the accident point of the apparatus;
FIG. 16 is a diagram for explaining a first modification of the first embodiment of the present invention, and is an enlarged waveform diagram of a current shunt ratio.
FIG. 17 is a diagram for explaining a first modification of the first embodiment of the present invention, and is a flowchart for explaining a method for searching for a stable section of a current shunt ratio.
FIG. 18 is a diagram for explaining a first modification of the first embodiment of the present invention, and is a schematic waveform diagram of a current shunt ratio for explaining the method;
FIG. 19 is a diagram for explaining a second embodiment of the present invention, and is a block diagram of a transmission line accident point locating device.
FIG. 20 is a diagram for explaining a third embodiment of the present invention, and is a block diagram of a power transmission line accident point locating device.
FIG. 21 is a diagram for explaining the third embodiment of the present invention, and is a flowchart showing an example of a transmission line accident point location program processed by the apparatus;
FIG. 22 is a diagram for explaining a conventional current shunt ratio method;
[Explanation of symbols]
[0020]
α Transmission line
1L, 2L line
1 Transmission line accident location system
10 Current shunt ratio calculator
20 Accident location section
30 Display panel
40 Input section
50 memory
100 Transmission line accident location system
60 Impedance calculator
70 Accident Location Department
30 Display panel
40 Input section
50 memory
200 Transmission line accident location system
81 Current shunt ratio / impedance calculator
82 Accident location section
83 Accident aspect judgment part
30 Display panel
40 Input section
50 memory

Claims (16)

In a transmission line fault locator that has the function of locating the fault point of a transmission line ground fault / short circuit accident using the current shunt ratio method or impedance method, the current shunt ratio or impedance based on the measured data of the transmission line For each instantaneous value and averages the current shunt ratio / impedance for a predetermined period after the accident occurs, and the average current shunt ratio or average obtained by the current shunt ratio / impedance calculator An accident locating unit for locating the accident point of the ground fault / short circuit accident based on the impedance, an input unit for inputting an actual specific accident point of the ground fault / short circuit accident, and the ground fault / short circuit A memo in which the relationship between the virtual accident point and the virtual current shunt ratio or virtual impedance obtained through a series of processes for locating the accident point is recorded as graph data Comprising the door, the accident orientation section obtains the virtual current data and / or virtual voltage data assuming a ground fault / short-circuit fault occurs in the transmission line by using a system simulator, virtual from the data While obtaining the current shunt ratio or virtual impedance and changing the virtual fault point on the system simulator, the virtual current shunt ratio or virtual impedance and the average current obtained by the current shunt ratio / impedance calculator corresponding to the virtual fault point By sequentially comparing the shunt ratio or the averaged impedance, the virtual current shunt ratio or virtual impedance that is closest to each other is found, and the virtual fault point corresponding to the virtual current shunt ratio or virtual impedance is determined as the ground fault / short-circuit fault. If the actual specific accident point is input through the input unit, In correcting the data of the graph held in the memory so that it passes through the intersection of the specific fault point and the virtual current shunt ratio or virtual impedance, after that, in locating the fault point of the ground fault / short circuit accident, By referring to the corrected graph data, a virtual fault point related to the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculation unit is obtained, and this is calculated as the ground fault / short-circuit fault. A transmission line accident point locating device characterized by having a configuration having a function of locating as an accident point. 2. The transmission line accident point locating device according to claim 1 , wherein the current shunt ratio / impedance calculation unit obtains the current shunt ratio or the amount of change in impedance when obtaining the average current shunt ratio or average impedance, and determines the most amount of change. A transmission line fault locating device characterized in that a stable section having a small length and a long period is searched and a current shunt ratio or impedance in the stable section is averaged. In a transmission line fault locating device that has the function of locating the fault point of a ground fault / short-circuit accident in the transmission line using the current shunt ratio method or impedance method, the current shunt ratio or impedance based on the measured data of the transmission line For each instantaneous value and average the current shunt ratio / impedance for the predetermined period after the accident occurs, and the average current shunt ratio or average obtained by the current shunt ratio / impedance calculator An accident locating unit for locating the accident point of the ground fault / short circuit accident based on the impedance, an input unit for inputting an actual specific accident point of the ground fault / short circuit accident, and the ground fault / short circuit A memo in which the relationship between the virtual accident point and the virtual current shunt ratio or virtual impedance obtained through a series of processes for locating the accident point is recorded as graph data Comprising the door, the current flow ratio / impedance calculation unit, when obtaining the average current flow ratio or averaging impedance, obtains the amount of change in current flow ratio or impedance, long the most amount of change is small and its life stability The section is searched and the current shunt ratio or impedance of the stable section is averaged, and when the actual fault point is input through the input unit, the accident location unit Correct the graph data stored in the memory so that it passes through the intersection of the specific fault point and the virtual current shunt ratio or virtual impedance, and then correct the ground fault / short-circuit fault point. Referring to the graph data, the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculator is calculated. Seeking hypothetical accident point in communication, power line fault point locating system, characterized in that has this and configured to have a function of orientation as the fault point of the ground fault / short circuit. In the transmission line accident point locating device according to claim 1, 2, or 3 , the accident locating unit is prepared in advance for each accident cause, basic current / voltage waveform data at the time of ground fault / short circuit accident, A configuration having a function of searching for the waveform basic data closest to the current / voltage waveform included in the measured data of the transmission line and locating the cause of the accident corresponding to the waveform basic data as the cause of the ground fault / short circuit accident A transmission line accident location system characterized by the fact that In power transmission line fault point locating system according to claim 1, 2, 3 or 4, wherein the transmission line measured data and previously prepared the transmission line fault aspects determining determines accident aspects of the accident on the basis of line information in The current shunt ratio / impedance calculation unit calculates the current shunt ratio or impedance, and the accident location unit calculates the virtual current shunt ratio or virtual impedance. A transmission line accident point locating device characterized in that it is configured to use a corresponding calculation formula. The current shunt ratio or impedance is obtained for each instantaneous value based on the measured data of the transmission line, the current shunt ratio or impedance for a predetermined period after the occurrence of the accident is averaged, and the ground fault is calculated based on the averaged current shunt ratio or impedance. Virtual current data and / or virtual voltage data assuming that a ground fault / short-circuit accident has occurred in the transmission line using a system simulator in a transmission line accident location method for locating the accident / short-circuit accident point The virtual current shunt ratio or virtual impedance is obtained from the data, and the virtual current shunt ratio or virtual impedance corresponding to the virtual fault point and the average current shunt ratio or Sequential comparison of averaged impedance, so that both are the closest virtual current shunt ratio or virtual impedancer A virtual fault point corresponding to the virtual current shunt ratio or virtual impedance is determined as the fault point of the ground fault / short-circuit accident, and the fault point of the ground fault / short-circuit fault is determined. When the relationship between the virtual fault point obtained in a series of processes and the virtual current shunt ratio or virtual impedance is recorded in the memory as graph data, and the actual specific fault point of the ground fault / short-circuit fault is input, the graph In correcting the graph data stored in the memory so that the specified fault point and the virtual current shunt ratio or virtual impedance cross each other, then the fault point of the ground fault / short-circuit fault is determined. The virtual fault point related to the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculation unit is obtained by referring to the corrected graph data. , Power transmission line fault point locating method characterized by locating it as the fault point of the ground fault / short circuit. In the transmission line accident point location method according to claim 6 , when obtaining the average current shunt ratio or the average impedance, obtain the amount of change of the current shunt ratio or impedance, and then search for the stable section with the smallest amount of change, A transmission line fault location method characterized by averaging the current shunt ratio or impedance in the stable section. The current shunt ratio or impedance is obtained for each instantaneous value based on the measured data of the transmission line, the current shunt ratio or impedance for a predetermined period after the occurrence of the accident is averaged, and the ground fault is based on the averaged current shunt ratio or impedance. When determining the average current shunt ratio or average impedance in the transmission line fault point location method for locating the accident point of an accident / short-circuit accident, obtain the current shunt ratio or the amount of change in impedance, and then the stable with the smallest amount of change. Search the section, average the current shunt ratio or impedance of the stable section, and perform the virtual fault point and virtual current shunt ratio obtained in a series of processes for determining the fault point of the ground fault / short circuit accident or The relationship with virtual impedance is recorded in the memory as graph data, and the actual specific accident point of the ground fault / short circuit accident When the power is applied, the graph data stored in the memory is corrected so that the graph passes through the intersection of the specific fault point and the virtual current shunt ratio or virtual impedance. When locating the fault point, the data of the corrected graph is referred to, and the virtual fault point related to the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculation unit is obtained. A transmission line accident location method characterized by locating as the accident point of the ground fault / short circuit accident . 9. The transmission line accident point location method according to claim 6, 7 or 8 , wherein current / voltage waveform basic data at the time of a ground fault / short circuit accident is prepared in advance for each cause of an accident and is included in the actual measurement data of the transmission line. A transmission line accident location method characterized by searching for the basic waveform data that is closest to the current / voltage waveform to be detected and determining the cause of the accident corresponding to the basic waveform data as the cause of the ground fault / short circuit accident. In the transmission line fault location method according to claim 6, 7, 8, or 9 , when calculating the current shunt ratio or impedance, and the virtual current shunt ratio or virtual impedance, the actual measurement data of the transmission line and the previously prepared data Determine the accident aspect of the accident based on the line information of the transmission line, and use the calculation formula corresponding to the determination result, or set and input the accident aspect of the accident, and calculate the calculation formula corresponding to the setting input A transmission line accident location method characterized by being used. The current shunt ratio or impedance is obtained for each instantaneous value based on the measured data of the transmission line by a computer, the current shunt ratio or impedance for a predetermined period after the occurrence of the accident is averaged, and based on the averaged current shunt ratio or averaged impedance In the transmission line fault location program for locating the fault point of the ground fault / short-circuit accident, virtual current data and the assumption that a ground fault / short-circuit accident has occurred in the transmission line using a system simulator / Or virtual voltage data is obtained, a virtual current shunt ratio or virtual impedance is obtained from the data, and a virtual current shunt ratio or virtual impedance corresponding to the virtual fault point and the average are calculated while changing a virtual fault point on the system simulator. Current current shunt ratio or averaged impedance is compared sequentially so that the virtual power Search for the shunt ratio or virtual impedance, and locate the virtual fault point corresponding to the virtual current shunt ratio or virtual impedance as the fault point of the ground fault / short circuit accident. When the relationship between the virtual accident point and the virtual current shunt ratio or virtual impedance obtained in a series of standardization processes is recorded in the memory as graph data, and the actual specific accident point of the ground fault / short circuit accident is input, The graph data stored in the memory is corrected so that the graph passes through the intersection of the specific fault point and the virtual current shunt ratio or virtual impedance, and then the fault point of the ground fault / short circuit fault is determined. In doing so, referring to the corrected graph data, the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculator is calculated. Seeking hypothetical accident point in fluid, which the ground fault / transmission line fault point locating program which it was characterized by that is the contents of orientation as the fault point of the short circuit. In the transmission line fault location program according to claim 11 , when obtaining the average current shunt ratio or the average impedance, the current shunt ratio or the amount of change in the impedance is obtained, and then the stable section with the smallest amount of change is searched. A transmission line fault location program characterized by averaging the current shunt ratio or impedance in the stable section. The current shunt ratio or impedance is obtained for each instantaneous value based on the measured data of the transmission line by a computer, the current shunt ratio or impedance for a predetermined period after the occurrence of the accident is averaged, and based on the averaged current shunt ratio or averaged impedance When determining the average current shunt ratio or impedance in the transmission line fault point location program that locates the fault point of the ground fault / short circuit accident, the amount of change in the current shunt ratio or impedance is calculated, A search is made for a stable section with a small amount of change, and the current shunt ratio or impedance of the stable section is averaged, and the virtual accident point obtained in a series of processes for determining the fault point of the ground fault / short circuit accident the relationship between the virtual current flow ratio or virtual impedance is recorded in the memory as the data of the graph, ground fault / short When the actual specific accident point of the accident is input, the graph data held in the memory is corrected so that the graph passes through the intersection of the specific accident point and the virtual current shunt ratio or virtual impedance, After that, in locating the fault point of the ground fault / short circuit accident, refer to the corrected graph data and relate to the average current shunt ratio or the average impedance obtained by the current shunt ratio / impedance calculator. A program for locating a transmission line accident point, characterized by obtaining a virtual accident point and locating it as an accident point of the ground fault / short circuit accident . In the transmission line fault location program according to claim 11, 12, or 13 , current / voltage waveform basic data at the time of a ground fault / short circuit accident is prepared in advance for each cause of the accident, and the measured data of the transmission line is used. A transmission line characterized by searching for the basic waveform data that is closest to the current / voltage waveform included, and locating the cause of the accident corresponding to the basic waveform data as the cause of the ground fault / short circuit accident Accident point location program. In the transmission line fault location program according to claim 11, 12, 13, or 14 , when calculating the current shunt ratio or impedance and the virtual current shunt ratio or virtual impedance, the measured data of the power transmission line and the prepared data are prepared in advance. Determine the accident aspect of the accident based on the line information of the transmission line, and use the calculation formula corresponding to the determination result, or if the accident aspect of the accident is set and input, it corresponds to the setting input A program for locating a transmission line accident point, characterized in that it is performed using a calculation formula. The contents of claim 11, 12, 13, 14 or 15 as a program for locating a transmission line accident point for locating a fault point of a ground fault / short circuit accident of a transmission line by a computer using a current shunt ratio method or an impedance method The recording medium which recorded the program for power transmission line accident point location characterized by what is recorded.

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