JPH0260414A - Transmission line protection system - Google Patents
Transmission line protection systemInfo
- Publication number
- JPH0260414A JPH0260414A JP20940688A JP20940688A JPH0260414A JP H0260414 A JPH0260414 A JP H0260414A JP 20940688 A JP20940688 A JP 20940688A JP 20940688 A JP20940688 A JP 20940688A JP H0260414 A JPH0260414 A JP H0260414A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- output
- fault
- ground fault
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 abstract description 2
- 230000002459 sustained effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 238000012790 confirmation Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、高抵抗接地系統の送電線保護において、特に
地絡事故相の選択しゃ断を行なう送電線保護方式に関す
るっ
（従来の技術）
高抵抗接地系統の地絡事故検出は、最も高感度な検出が
期待てきる。零相電流や零相電圧に応動する保護継電器
が使用されているため、１線地絡事故時に地絡事故相を
識別することはてきない。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a transmission line protection system for a high resistance grounding system, and particularly to a transmission line protection method for selectively disconnecting phases that have a ground fault. Prior art) The most sensitive detection of ground faults in high-resistance grounding systems is expected. Since a protective relay that responds to zero-sequence current or zero-sequence voltage is used, it is not possible to identify the phase in which a ground fault occurs in the event of a single-wire ground fault.
従って、１線地絡事故の場合にも通常は３相しゃ断が行
なわれる。Therefore, three-phase cutoff is normally performed even in the case of a one-line ground fault.
事故時のしゃ断範囲を必要最少限に止めることを目的と
して、高抵抗接地系統の１線地絡時に７１τ故相の選択
しゃ断を行なう場合には、欠相状態て発生ずる零相電気
量で誤検出することのない地絡事故検出方式と、系統電
気量の事故中の変化に着目し地絡事故相を検出する手段
が必要になる。In order to keep the disconnection range to the minimum necessary in the event of an accident, when selectively disconnecting the 71τ failed phase at the time of a single-wire ground fault in a high-resistance grounding system, it is necessary to A method for detecting ground faults that cannot be detected, and a means for detecting ground fault phases by focusing on changes in the amount of electricity in the system during the fault are required.
第２図は、事故相選択回路を用いて地籍事故相の選択し
ゃ断を行なう場合の回路構成を示すフロック図である。FIG. 2 is a block diagram showing a circuit configuration when a fault phase selection circuit is used to selectively cut off a cadastral fault phase.
１は零相電気量を導入し地絡事故を検出する回路て、例
えば、零相電流を用いた電流差動ｉｉ１電器のように保
護区間内に地絡事故が発生している場合のみ動作する１
ｉｔｔ電器を使用する。1 is a circuit that introduces a zero-sequence electric quantity to detect a ground fault.For example, it operates only when a ground fault occurs within the protected area, such as in a current differential II1 electric appliance that uses a zero-sequence current. 1
Use IT appliances.
２は事故相選（Ｒ回路て、１＠地絡事故相を検出し、当
該相のしゃ断許容指令を出力する。ＡＮＤ凹１１３ａ。2 is a fault phase selection (R circuit) which detects the 1 @ ground fault fault phase and outputs a cutoff permission command for the relevant phase. AND concave 113a.
３ｂ、 ３ｃは地絡事故検出回路１と事故相選択回路２
の出力のＡＮＤ条件が成立した相にしゃ断指令を出力す
るよう構成している。3b and 3c are ground fault detection circuit 1 and fault phase selection circuit 2
The configuration is such that a cutoff command is output to the phase for which the AND condition of the outputs of is satisfied.
事故相選択回路２の地絡事故相を検出する手段は種々提
案されているか、基本的には相電流または相電圧の事故
中の変化を検出し、地絡相の選別を行なう。例えば、相
電流を用いて事故相選択を行なう方法は、各相電流のう
ち電流値が最大の相を検出する方法等がある。しかし、
周知の如く高抵抗接地系統の地絡事故電流、即ち零相電
流は、中性点接地抵抗て抑えられるため、一般には負荷
電流に比へて大きな値にならす、系統状態によっては相
電流の大小関係に有意差がなく、事故相選択が不確実に
なる。Various means have been proposed for detecting a ground fault phase in the fault phase selection circuit 2, and basically, a change in phase current or phase voltage during a fault is detected and a ground fault phase is selected. For example, a method of selecting a faulty phase using phase currents includes a method of detecting the phase with the maximum current value among the phase currents. but,
As is well known, the ground fault current in a high-resistance grounding system, that is, the zero-sequence current, is suppressed by the neutral point grounding resistance, so it generally becomes a large value compared to the load current. There is no significant difference in the relationship, making accident phase selection uncertain.
相電流を用いて事故相選択を行なう方法には、各相電圧
のうち電圧値が最小の相を検出する方法等があるか、こ
の場合にも電源端ては事故相電属の降下は少なく、背後
インピータンス、事故点によっては事故４１１選択を誤
る可能性がある。Is there a method of selecting the faulty phase using phase current, such as detecting the phase with the minimum voltage value among each phase voltage?Even in this case, the voltage drop of the faulty phase is small at the power supply end. , back impedance, and the accident point, there is a possibility that the accident 411 selection is wrong.
（発明が解決しようとする課題）
般に 高抵抗接地系統の地絡事故相は、用型ｄｔあるい
は相電圧を用いて選択ぜさ゛るを得ないが、すべての系
統条件について確実に事故相選（Ｒが行なえる方式を提
供することは困難である。事故相選択を誤ると健全相を
誤しべ・断すると共に、事故相の事故除去が遅れ、系統
に勺える動揺が拡大する虞れかあり好ましくない。従っ
て事故相選択を誤った場合においても可能な限り高速に
事故を除去する手段を講する必要がある。(Problem to be Solved by the Invention) In general, the ground fault phase of a high resistance grounding system cannot be selected by using the service type dt or the phase voltage, but it is possible to reliably select the fault phase for all system conditions ( It is difficult to provide a method that can perform R.If the fault phase is selected incorrectly, the healthy phase may be mistakenly identified or disconnected, and there is a risk that the removal of the fault in the fault phase will be delayed, and the disturbance in the system will increase. Therefore, even if the accident phase selection is incorrect, it is necessary to take measures to eliminate the accident as quickly as possible.
本発明はＬ記問題点を解決するためになされなしのてあ
り、高抵抗接地系統の地絡事故相の選択しゃ断を行なう
送電線保護において、事故相選択を誤った場合において
も高速かつ確実に事故を除去することができる送電線保
護方式を提供することを目的としている。The present invention has been made to solve the problems described in L, and is used to protect power transmission lines by selectively disconnecting the ground fault phase of a high-resistance grounding system, even when fault phase selection is incorrect. It aims to provide a power transmission line protection method that can eliminate accidents.
［発明の構成］
（課題を解決するための手段）
本発明ては、高抵抗接地系統の地絡事故を、零相電流を
用いた電流差動継電器により、高感変に検出する地絡事
故検出回路１の出力と、相電流・相電圧を用いて事故相
選択を行なう事故相選択回路２の出力との論理積条件が
成立した相にしゃ断指令を出力するよう構成した地絡事
故相選択しゃ断回路において、地絡事故検出回路１の出
力が事故継続確認回路４て一定時間＠！：続したことを
検出した場合には、３相しゃ断を行なうよう構成した。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method for detecting ground faults in a high-resistance grounding system with high sensitivity using a current differential relay using zero-sequence current. Ground fault fault phase selection configured to output a cutoff command to a phase for which an AND condition is satisfied between the output of the detection circuit 1 and the output of a fault phase selection circuit 2 that selects fault phases using phase current and phase voltage. In the cutoff circuit, the output of the ground fault detection circuit 1 is output from the fault continuation confirmation circuit 4 for a certain period of time@! :If a continuation is detected, a three-phase cutoff is performed.
（作 用）
上記構成によれは、事故相選択回路２が地絡事故相の選
択を誤り、事故除去てきなかった場合においても、地絡
事故検出回路１が継続動作するなめ事故継続確認回！？
８４から３相しゃ断指令が出力され、所定時間内に確実
に事故を除去することが可能になる。(Function) According to the above configuration, even if the fault phase selection circuit 2 makes a mistake in selecting the ground fault fault phase and fails to remove the fault, the ground fault fault detection circuit 1 continues to operate to confirm fault continuation! ?
A three-phase cutoff command is output from 84, making it possible to reliably eliminate the accident within a predetermined time.
（実施例）
以下、図面を参照して実施例を説明する。第１図は、本
発明による送電線保護方式の一実施例のブロック図であ
る。第１図において第２図と同一部分については同一符
号を付す。(Example) Hereinafter, an example will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a power transmission line protection system according to the present invention. In FIG. 1, the same parts as in FIG. 2 are given the same reference numerals.
１は零相電流を用いた電流差動１１電器に上り地絡事故
検出を行なう回路て、系統の保護範囲内に地絡事故が発
生している場合に事故検出出力を出す。２は事故相選択
回路で、１線地絡事故相を検出し、当該相のしゃ断許容
指令を出力する。３ａ。1 is a current differential circuit using a zero-sequence current to detect a ground fault fault, and outputs a fault detection output when a ground fault fault occurs within the protection range of the system. Reference numeral 2 denotes a fault phase selection circuit which detects a single line ground fault fault phase and outputs a cutoff permission command for the phase. 3a.
３ｂ、 ３ｃはへＮＤ回路、４は事故の継続時間を確認
するためのオンティレイ・タイマ、５ａ、 ５ｂ、 ５
ｃはＯＲ回路である。3b, 3c are ND circuits, 4 is an on-time delay timer for checking the duration of the accident, 5a, 5b, 5
c is an OR circuit.
次に作用説明をする。先ず系統に地絡事故が発生ずると
、事故検出回路１が検出出力を出す。この際、事故相選
択回路２ては１線地絡事故相を検出し、前記事故検出出
力との論理積条件が成立した相に対して、しゃ断指令が
出力されてしゃ断器の引外しが行なわれる。Next, I will explain how it works. First, when a ground fault occurs in the system, the fault detection circuit 1 outputs a detection output. At this time, the fault phase selection circuit 2 detects the 1-wire ground fault fault phase, and outputs a cutoff command to the phase for which the AND condition with the fault detection output is satisfied, thereby tripping the breaker. It will be done.
この時、事故相選択回路２において事故相を誤選択した
場合には事故除去がてきないため、地絡事故検出口（１
８１が継続動作する。この地絡事故検出回路の継続動作
をオンティレイ・タイマ４が検出すると、０［（回路５
ａ、 ５ｂ、 ５ｃを介して残相のしや断器の引外しを
行なう。At this time, if the fault phase is incorrectly selected in the fault phase selection circuit 2, the fault cannot be removed.
81 continues to operate. When the on-timer 4 detects the continued operation of this ground fault detection circuit, 0[(circuit 5
A, 5b, and 5c are used to remove residual phase and trip the breaker.
オンデイレイ・タイマ４による事故継続の確認時間は、
極力短時間とすることが望ましいか、事故相選択が正し
く行なわれ事故相し々断器が引外された場合に、誤って
３相しゃ断指令を出力しないよう、下記の時間協調か必
要である。The confirmation time for accident continuation using on-day delay timer 4 is as follows:
It is desirable to make it as short as possible, or the following time coordination is necessary to avoid outputting a three-phase cutoff command by mistake in the event that fault phase selection is performed correctly and faulty disconnectors are tripped one after another. .
事故継続確認時間〉しゃ断器引外し時間土地絡事故検出
回路復帰時間
第２図は、本発明による他の実施例を説明するためのブ
ロック図である。第２図において第１図と同一部分につ
いては同一符号を付し、説明を省略する。Accident Continuation Confirmation Time> Breaker Trip Time Land Fault Accident Detection Circuit Recovery Time FIG. 2 is a block diagram for explaining another embodiment of the present invention. In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.
本実施例ては事故相選択回路が事故相を選択して出力し
た場合に、ワンショットパルスを出力し、所定時間経過
してフンショットパルスがなくなった時点において依然
として地絡事故が継続している時に、残相のしゃ断器の
引外しを行なうようにしている。In this embodiment, when the fault phase selection circuit selects and outputs a fault phase, it outputs a one-shot pulse, and when a predetermined period of time passes and the fault phase disappears, the ground fault still continues. Occasionally, the residual phase circuit breaker is tripped.
即ち、ＯＲ回路６は事故相選択回路２により選択された
地絡事故相のしゃ断器引外し出力について、３相の叶条
件を判定する回路て、この出力てワンショットタイマ７
か駆動される。事故相の誤選択により しゃ断器か引外
されても事故除去ができない場合は、事故検出回路２は
動作継続する。ワンショットタイマ７の出力が一定時間
後に復帰すると、１ｉＯＴ回路８により、ＡＮＤ回路９
の論理積柴件か成立するため、３相しゃ断指令が出力さ
れ、ＯＲ回路５ａ、 ５ｂ、 ５ｃを介して残相のしゃ
断器引外しが行なわれる。ワンショットタイマ７の時間
については、前記実施例と同様の時間協調か必要である
。That is, the OR circuit 6 is a circuit that determines the three-phase breaker tripping output of the ground fault fault phase selected by the fault phase selection circuit 2, and this output is used as the one-shot timer 7.
or driven. If the fault cannot be removed even if the breaker is tripped due to incorrect selection of the fault phase, the fault detection circuit 2 continues to operate. When the output of the one-shot timer 7 returns after a certain period of time, the 1iOT circuit 8 causes the AND circuit 9
Since the logical product condition holds true, a three-phase cutoff command is output, and the remaining phase breaker is tripped via OR circuits 5a, 5b, and 5c. Regarding the time of the one-shot timer 7, time coordination similar to that of the previous embodiment is required.
［発明の効果］
以北説明した如く、本発明によれは高抵抗接地系統の地
絡事故を零相電流を用いた電流差動継電器により、高感
変に検出する地絡事故検出回路の出力と、相電流・相電
圧を用いて事故相選択を行なう事故相選択回路の出力の
ＡＮＤ柴件が成立した相にじゃ［断指令を出力するよう
構成し、さらに地絡事故検出回路の出力が一定時間継続
した場合には３相しべ・断を行なうよう構ｂｋシたため
、事故相選択回路が地絡事故相の選択を誤り、事故除去
てきなかった場合においても、短時間に確実に事故を除
去することの可能な送電線保護方式を提供てきる。[Effects of the Invention] As explained above, the present invention provides an output of a ground fault detection circuit that highly sensitively detects ground faults in a high-resistance grounding system using a current differential relay using zero-sequence current. and a fault phase selection circuit that selects a fault phase using phase current and phase voltage. The system is designed to disconnect or disconnect three phases if the fault continues for a certain period of time, so even if the fault phase selection circuit makes a mistake in selecting the fault phase and fails to remove the fault, the fault will be reliably resolved in a short period of time. This provides a power transmission line protection method that can eliminate this problem.
第１図は本発明による送電線保護方式を説明するための
一実施例ブロック図、第２図は本発明による送電線保護
方式を説明するだめの他の実施例ブロック図、第３図は
従来の送電線保護方式を説明するだめのブロック図であ
る。
１・・・地絡事故検出回路 ２・・・事故相選択回路
３ａ、 ３ｂ、 ３ｃ、 ９−ＡＮＤ回路４・・・オン
デイレイ・タイマ
５ａ ５ｂ、 ５ｃ、 ６・ＯＲ回路７・・・フン
ショット・タイマ
８・・・ＮＯＴ回路
代理人 弁理士 則近 憲佑
同 第子丸 健FIG. 1 is a block diagram of one embodiment for explaining the power transmission line protection method according to the present invention, FIG. 2 is a block diagram of another embodiment for explaining the power transmission line protection method according to the present invention, and FIG. 3 is a conventional block diagram. FIG. 2 is a block diagram illustrating a power transmission line protection method. 1...Ground fault detection circuit 2...Fault phase selection circuit 3a, 3b, 3c, 9-AND circuit 4...On-delay timer 5a 5b, 5c, 6-OR circuit 7...Fun shot Timer 8...NOT circuit agent Patent attorney Kensuke Norichika Ken Daishimaru
Claims (1)
手段と、１線地絡事故が発生した相を各相電気量を基に
検出し、各相毎に検出結果を出力する第２の手段と、前
記第１の手段の出力と第２の手段の出力との論理積条件
が成立した相に対してしゃ断器用外し指令を出力する第
３の手段とを備えた送電線保護方式において、前記第１
の手段の出力が一定時間継続したことを検出する第４の
手段を備え、第４の手段の出力によりしや断器に３相引
外し指令を出力するよう構成したことを特徴とする送電
線保護方式。A first method detects a ground fault in a power system using zero-phase electrical quantity, and a second method detects a phase in which a one-line ground fault has occurred based on the electrical quantity of each phase, and outputs a detection result for each phase. and a third means for outputting a breaker removal command to a phase for which a logical product condition of the output of the first means and the output of the second means is satisfied. In the first
A power transmission line characterized by comprising a fourth means for detecting that the output of the means has continued for a certain period of time, and configured to output a three-phase tripping command to the breaker according to the output of the fourth means. Protection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20940688A JPH0260414A (en) | 1988-08-25 | 1988-08-25 | Transmission line protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20940688A JPH0260414A (en) | 1988-08-25 | 1988-08-25 | Transmission line protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0260414A true JPH0260414A (en) | 1990-02-28 |
Family
ID=16572357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20940688A Pending JPH0260414A (en) | 1988-08-25 | 1988-08-25 | Transmission line protection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0260414A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0555731U (en) * | 1991-12-27 | 1993-07-23 | 株式会社明電舎 | Circuit for detecting disconnection of transmission line that uses two circuits |
-
1988
- 1988-08-25 JP JP20940688A patent/JPH0260414A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0555731U (en) * | 1991-12-27 | 1993-07-23 | 株式会社明電舎 | Circuit for detecting disconnection of transmission line that uses two circuits |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5825599A (en) | Ground fault circuit interrupter system with uncommitted contacts | |
| CA2052101C (en) | Fault detection method and apparatus | |
| KR100468797B1 (en) | Protective relay system | |
| US4528611A (en) | Relay for pilot protection of electrical power lines | |
| US5103365A (en) | Downed conductor automatic detecting device | |
| EP1335470B1 (en) | Directional comparison distance relay system | |
| JP2000188825A (en) | Grounding system and protective system for incoming and distributing facility | |
| JP7218497B2 (en) | Ground fault protection relay system | |
| US4536815A (en) | Protective relay apparatus and method for providing single-pole tripping | |
| JPH0260414A (en) | Transmission line protection system | |
| JP2008160910A (en) | Protective relay device | |
| AU2002313978B2 (en) | Apparatus and method for servicing a distribution bus | |
| JP7347952B2 (en) | protection device | |
| JPS62177462A (en) | Deciding device for power distribution line fault section | |
| US6101075A (en) | System for improving protective relay coordination with other protective elements in power system | |
| JP2916148B2 (en) | Line selection relay | |
| JPS6285636A (en) | Grounding protecting system | |
| Mozina | Upgrading the Protection and grounding of generators at Petroleum and Chemical Facilities | |
| Giuliante et al. | A directional wave detector relay with enhanced application capabilities for EHV and UHV lines | |
| JPH0510512Y2 (en) | ||
| JPH04281327A (en) | Faint ground fault selective interruption system for distribution system | |
| JPH102925A (en) | Fault-point locating system | |
| JPS6223222Y2 (en) | ||
| JPS6347052B2 (en) | ||
| JPS6026414A (en) | Ground-fault direction protecting relaying device |