JPH0217467A

JPH0217467A - Apparatus for locating faulty point

Info

Publication number: JPH0217467A
Application number: JP16668088A
Authority: JP
Inventors: Isao Chihara; 千原　勲
Original assignee: Fuji Electric Co Ltd
Current assignee: Fuji Electric Co Ltd
Priority date: 1988-07-06
Filing date: 1988-07-06
Publication date: 1990-01-22
Anticipated expiration: 2010-03-29
Also published as: JPH0727002B2

Abstract

PURPOSE:To enable early discovery of a faulty point by providing means to detect a multiple fault of a system and to detect a change in the form of a fault respectively and by delivering an output of 'reference location' when the multiple fault or the change in the form of the fault is detected. CONSTITUTION:In the case when an insufficient-voltage relay 27S provided inside a locating apparatus operates while an overcurrent detection relay 51S provided also therein operates only in one phase, for instance, a multiple fault detecting element 52 detects the fault as a short-circuit fault and as a ground fault of phase difference between inside and outside (multiple fault) wherein a fault current flows forward only in one phase. A fault form change detecting element 53 makes judgement as a change in the form of the fault in the case when the relays 51S and 27S operate due to a single operation of a ground fault overvoltage relay 64V or in the case contrary to the former. Since the multiple fault and the change in the form of the fault are introduced into an OR gate 54, a message of 'reference location' is outputted through an output circuit 6B when at least one of them is detected. From this message, a person for maintenance can know that a location distance determined by a location distance computing element 51 contains an error.

Description

【発明の詳細な説明】〔産業上の利用分野〕この発明は、電力系統を構成する送電線に発生した故障
地点を計測し、故障のすみやかな復旧を図るための故障
点標定装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a failure point locating device for measuring failure points occurring in power transmission lines constituting an electric power system and for prompt recovery from the failure.

〔従来の技術〕[Conventional technology]

従来、か＼る標定装置として系統故障時の電圧。 Conventionally, the voltage at the time of grid failure was used as a location device.

電流データをもとに下記０式の如き標定演算を行い、故
障点までの距離を求めるものが知られている。すなわち
、電圧値を電流値で割ってインピーダンス値を求め、故
障点抵抗の影！＃を＃失するためにインピーダンス値の
電流入力に対する虚数量、つまりリアクタンス分を求め
、あらかじめ整定された単位長の送電線インピーダンス
（リアクタンス分）で際すことにより、故障点までの距
離を求ぬるものである。There is a known method that calculates the distance to the failure point by performing a location calculation such as the following equation 0 based on current data. In other words, divide the voltage value by the current value to find the impedance value, and calculate the shadow of the fault point resistance! To eliminate #, find the imaginary quantity of the impedance value for the current input, that is, the reactance component, and calculate the distance to the fault point by dividing it by the transmission line impedance (reactance component) of a preset unit length. It is something.

Ｋｌ　−（Ｌｍ　Ｖ／Ｉ　）　／　Ｋ　ｚ　　　　　　
、、、、、、　　■Ｋｌ：標定距離Ｖ；電圧入力値（「・」印を付してベクトル量を示す）Ｉ；電流入力値（「・」印を付してベクトル量を示す）Ｋｚ；単位長の送電線インピーダンス（リアクタンス分）〔発明が解決しようとする課題〕しかしながら、多重故障が生じると上記演算式では誤差
を生じるだけでなく、標定演算中に故障形態が変化する
と標定誤差を生じると云う問題がある。Kl - (Lm V/I) / Kz
,,,,,, ■Kl: Orientation distance V; Voltage input value (marked with “・” to indicate vector amount) I; Current input value (marked with “・” to indicate vector amount) Kz ; Transmission line impedance (reactance component) of unit length [Problem to be solved by the invention] However, when multiple faults occur, the above equation not only causes an error, but also causes a location error when the fault type changes during the location calculation. There are problems that arise.

したがって、この発明は標定距離に誤差が予想されると
き（多重故障時、故障形態変化時）は「参考測定」なる
メツセージを出力することにより、故障点迄の距離ヲ正
しく把握できるようにし、故障点の早期発見、故障の早
期復旧を図ることを目的とする。Therefore, when an error is expected in the orientation distance (in the event of multiple failures or a change in failure type), this invention outputs a message called "reference measurement" so that the distance to the failure point can be accurately determined. The purpose is to detect problems early and recover from failures early.

〔課題を解決するための手段〕[Means to solve the problem]

従来の故障点標定装置に対し、系統の多重故障を検出す
る第１の検出手段と、故障形態の変化を検出する第２の
検出手段とを設け、多重故障または故障形態の変化が検
出されたときは「参考標定」なる出力を出す。A conventional fault point locating device is provided with a first detection means for detecting multiple faults in a system and a second detection means for detecting a change in failure type, so that multiple faults or a change in failure type are detected. At this time, an output called ``reference orientation'' is output.

〔作用〕[Effect]

多重故障時または故障形態の変化時には、「参考標定」
なるメツセージを出すことにより、標定距離を正しく把
握できるようにし、故障点の早期発見、故障の早期復旧
を図る。In the event of multiple failures or changes in failure type, "reference orientation"
By issuing a message, the target distance can be accurately grasped, and failure points can be detected early and failures can be recovered quickly.

〔実施例〕〔Example〕

第１図はこの発明の実施例を示すブロック図である。同
図において、１〜４は電圧Ｖ、電流■の入力部を示す。FIG. 1 is a block diagram showing an embodiment of the invention. In the figure, numerals 1 to 4 indicate input sections for voltage V and current ■.

電圧変成器１．′＠流変成器２は系統から入力される電
圧Ｖ、電電流上それぞれ適宜な信号レベルに変換する。Voltage transformer 1. '@The current transformer 2 converts the voltage V and current input from the system into appropriate signal levels.

アナログフィルタ３Ａ。Analog filter 3A.

３Ｂは系統故障時の入力量から高調波成分を除去して基
本波成分のみ’ｔｍａ＋し、アナログ／ディジタル（Ａ
／Ｄ　）変換器４は電圧、電流入力をそれぞれディジタ
ル量に変換する。3B removes harmonic components from the input amount at the time of a system failure and converts only the fundamental wave component to 'tma+', and converts analog/digital (A
/D) The converter 4 converts the voltage and current inputs into digital quantities, respectively.

標定演算処理部５は標定距離演算部５１．多重故障検出
部５２．故障形態変化検出部５３およびオアゲート５４
からなり、標定距離演算部５１は先の０式にもとづき標
定距離を演算する。その結果は、出力回路６Ａを介して
出力される。多重故障検出［５２は標定装置内部に設け
られている過電流検出リレー（５１８）、不足電圧リレ
ー（２７８）および電流量検出リレー（６０８）の各動
作状態から、多重故障を識別する。例えば、不足電圧リ
レー（２７８）が動作し、過電流検出リレー５１Ｓが１
相のみしか動作しない場合は、第２図の如く短絡故障で
故障電流が前方に１相しか流れない内外部異相地絡（多
重数［）として検出する。The orientation calculation processing section 5 includes an orientation distance calculation section 51. Multiple failure detection unit 52. Failure type change detection unit 53 and OR gate 54
The orientation distance calculating section 51 calculates the orientation distance based on the above equation 0. The result is output via the output circuit 6A. Multiple failure detection [52] identifies multiple failures from the operating states of the overcurrent detection relay (518), undervoltage relay (278), and current amount detection relay (608) provided inside the locating device. For example, the undervoltage relay (278) is activated and the overcurrent detection relay 51S is activated.
If only one phase operates, it is detected as an internal/external different-phase ground fault (multiple number [)] in which the fault current flows forward in only one phase due to a short-circuit fault, as shown in FIG.

また、第３図の如く平行２回ｉ１Ｌ　、２Ｌの運用時に
、過電流検出リレー５１８と電流量検出リレー６０８の
出力がＩＬ側および２Ｌ側とも′１”になった場合は、
故障電流がＩＬ、２Ｌに分流する、ＩＬ側、２Ｌ側にま
たがる異相地絡（多重故障）として検出する。た寸し、
標定距離が相手端に近い場合は、リレー６０８で電流鰍
検出が誤まる場合があるので、この場合は検出対象から
外すこと＼する。In addition, when the outputs of the overcurrent detection relay 518 and the current amount detection relay 608 become '1' on both the IL side and the 2L side during parallel operation of i1L and 2L twice as shown in Fig. 3,
It is detected as a different-phase ground fault (multiple fault) spanning the IL side and 2L side, where the fault current is shunted to the IL and 2L. The size was
If the orientation distance is close to the other end, the relay 608 may incorrectly detect the current gill, so in this case it is excluded from the detection target.

第４図に平行２回線運用時の異相地絡検出回路の具体例
を示す。FIG. 4 shows a specific example of a different-phase ground fault detection circuit when operating two parallel lines.

これはＩＬ（ｉｔ！ｌ、２Ｌ側の各過電流検出リレー（
１５１８１〜１５１８３．２５１８−１．２５１八　　
　　　　　　　　　八８３）と電流量検出リレー（６０Ｓ−１〜６０８−３）
の出力をアンドゲートＡＮＩＩ〜ＡＮ１３゜ＡＮ２１〜
ＡＮ２３へ導き、その出力から異相地絡を検出するもの
である。こ＼では、リレー１５Ｓ−１と６０８−１の出
力によりＡＮＩＩ、リレー２５ＩＳ−２と６Ｏ８−２の
め力によりＡＮ２２がそれぞれ動作し、第３図に矢印で
示す如き異相地絡故障が生じたことを示している。なお
、各リレーが論理”１″を出力する条件は次のとおりで
ある。た寸し、人相電流、ＡＢ間電電圧例を示すが、他
の相電流、ｍＶＩ電圧についても同様である。This is IL (it!l, each overcurrent detection relay (it!l) on the 2L side (
15181-15183.2518-1.2518
883) and current detection relay (60S-1 to 608-3)
The output of AND gate ANII~AN13゜AN21~
It leads to AN23 and detects a different phase ground fault from its output. In this case, ANII was activated by the output of relays 15S-1 and 608-1, and AN22 was activated by the force of relays 25IS-2 and 6O8-2, resulting in a different phase ground fault as shown by the arrow in Figure 3. It is shown that. The conditions for each relay to output logic "1" are as follows. Although examples of human phase current and A-B voltage are shown, the same applies to other phase currents and mVI voltage.

リレー６０Ｓ；ＩＬ側　１　’Ａｔ　Ｉ　　Ｉ　ＩＡ２１　＞　。Relay 60S; IL side 1’At I IA21>.

２Ｌ側　１■Ａ２１　１’Ａ１１＞０リレー６４　Ｖ　；　ｌＶｏ　ｌ　＞Ｋ６４ｖなお、以
上の如き多重故障については、装置内部に設けられてい
る各種リレーの出力と故障との対応関係を予めテーブル
化しておくようにすれば、第４図の如き回路を設けるこ
となく容易に多重故障を検出することができる。このよ
うにして、第１図の検出部５２により多重故障が検出さ
れる。2L side 1■A21 1'A11>0 Relay 64 V; lVol>K64vIn addition, regarding the above multiple failures, the correspondence between the outputs of the various relays installed inside the device and the failures is prepared in advance in a table. If this is done, multiple faults can be easily detected without providing a circuit as shown in FIG. In this way, multiple failures are detected by the detection unit 52 in FIG.

第１図の故障形態変化検出部５３は、以下の如くして故
障形態変化を検出する。The failure type change detection unit 53 in FIG. 1 detects a failure type change in the following manner.

すなわち、標定装置内部に設けられている過電流検出リ
レー５１Ｓ、不足電圧リレー２７８および地絡過電圧リ
レー６４Ｖのうち、リレー５１８および２７８は短絡故
障時に動作し、リレー６４Ｖのみが動作する場合は１線
地絡故障であることより、リレー６４Ｖの単独動作から
リレー５１８゜２７８が動作した場合、またはリレー５
１８，２７８が動作している状態からリレー６４Ｖの単
独動作に変わった場合は、故障形態変化と判断する。That is, among the overcurrent detection relay 51S, undervoltage relay 278, and ground fault overvoltage relay 64V provided inside the location device, relays 518 and 278 operate in the event of a short-circuit failure, and when only relay 64V operates, the 1-wire Due to a ground fault, if relay 518°278 operates from relay 64V acting alone, or if relay 5
If the state changes from the state in which the relay 18,278 is operating to the independent operation of the relay 64V, it is determined that the failure type has changed.

また、リレー５１８．２７８は３相の各人相。Also, relay 518.278 has three phases for each person.

Ｂ相、Ｃ相に設けであるので、動作相が標定演算中に変
わった場合も故障形態変化と判断する。さらに、演算部
５１にて実行される推定演算を、故障発生時の過渡現象
が収束した状態から始めてしゃ断器が開路される前まで
の間の安定した状態で繰り返し行い、その間の標定演算
結果の最大値Ｋ１ｍａＸ　ｌ最小値に’ｍ　ｉ　ｎとの
差が、”ｍａｘ　−に’ｍｉｎ　＞　Ｋの如く標定誤差最大値によりも大きければ、故障形態が
変化したと判断するようにしても良い。Since it is provided in the B phase and C phase, even if the operating phase changes during orientation calculation, it is determined that the failure type has changed. Furthermore, the estimation calculation executed by the calculation unit 51 is repeated in a stable state starting from the state where the transient phenomenon at the time of failure has converged until before the circuit breaker is opened, and the orientation calculation result during that time is If the difference between the maximum value K1maXl and the minimum value 'min' is larger than the maximum orientation error value such as "max - 'min>K", it may be determined that the failure type has changed.

多重故障検出部５２および故障形態変化検出部５３の出
力はオアゲート５４に導入されているので、多本数ＩＩ
Ｉまたは故障形態変化の少なくとも一方が検出されたと
きは、出力回路６Ｂを介して「参考標定」なるメツセー
ジを出力する。これにより、保守者は演算部５１にて求
められる標定距離には誤差を含むことを知ることができ
る。Since the outputs of the multiple fault detection section 52 and the fault type change detection section 53 are introduced into the OR gate 54, the multiple number II
When at least one of I or a change in failure type is detected, a message "Reference Orientation" is outputted via the output circuit 6B. This allows the maintenance person to know that the orientation distance determined by the calculation unit 51 includes an error.

〔発明の効果〕〔Effect of the invention〕

この発明によれば、標定距離を求める演ｎを行う一方、
標定誤差が予想される（多重故障時、故障形態変化時）
時は「参考標定」を出力するようにしたので、標定距離
に誤差が含まれる場合を保守者に正確に知らせることが
でき、故口点の早期発見と故障の早期復旧が可能となる
利点がもたらされる。According to this invention, while performing the operation n for determining the orientation distance,
Orientation errors are expected (when multiple failures occur, when failure types change)
By outputting a "reference orientation," maintenance personnel can be accurately notified when there is an error in the orientation distance, which has the advantage of allowing early detection of dead points and early recovery from failures. brought about.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明の実施例を示すブロック図、第２図は
内外部異相地絡故障を説明するための説明図、第３図は
平行２回線運用時の異相地絡故障を説明するための説明
図、第４図はその検出回路例を示すブロック図である。符号説明１・・・・・・電圧変成器、２・・・・・・電流変成器
、３人。３Ｂ・・・・・・アナログフィルタ、４・・・・・・ア
ナログ／ディジタル（Ａ／Ｄ　）変換器、５・・・・・
・標定演算処理部、５１・・・・・・標定距離演算部、
５２・・・・・・多重故障検出部、５３・・・・・・故
障形態変化検出部、５４・・・・・・オアゲー）、６Ａ
、６Ｂ・・・・・・出力回路。代理人　弁理士　並　木　昭　夫代理人　弁理士　松　崎　　　　清１し第２図第４閃Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram for explaining an internal and external different phase ground fault, and Fig. 3 is an explanatory diagram for explaining a different phase ground fault when operating two parallel lines. FIG. 4 is a block diagram showing an example of the detection circuit. Code explanation 1...Voltage transformer, 2...Current transformer, 3 people. 3B...Analog filter, 4...Analog/digital (A/D) converter, 5...
- Orientation calculation processing section, 51... Orientation distance calculation section,
52...Multiple failure detection unit, 53...Failure type change detection unit, 54...Or game), 6A
, 6B... Output circuit. Agent Patent Attorney Akio Namiki Agent Patent Attorney Kiyoshi Matsuzaki Figure 2 Figure 4

Claims

【特許請求の範囲】系統故障時の電圧、電流入力データをもとに送電線故障
点までの標定距離を演算し出力する故障点標定装置にお
いて、系統の多重故障を検出する第１の検出手段と、故障形態
の変化を検出する第２の検出手段と、を設け、多重故障
または故障形態の変化が検出されたときは「参考標定」
なる出力を出すことを特徴とする故障点標定装置。[Scope of claims] In a fault point locating device that calculates and outputs a location distance to a power transmission line fault point based on voltage and current input data at the time of a system fault, the first detection means detects multiple faults in the system. and a second detection means for detecting a change in failure type, and when multiple failures or a change in failure type is detected, "reference orientation" is provided.
A failure point locating device characterized by outputting an output of: