JP3880773B2

JP3880773B2 - Protection system

Info

Publication number: JP3880773B2
Application number: JP2000120364A
Authority: JP
Inventors: 茂佐藤; 政夫堀
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2000-04-21
Filing date: 2000-04-21
Publication date: 2007-02-14
Anticipated expiration: 2020-04-21
Also published as: JP2001309544A

Description

【０００１】
【発明の属する技術分野】
本発明は、電力系統を保護する保護システムに関する。
【０００２】
【従来の技術】
電力系統の電圧階級が低い送電系統や配電系統では送電線，変圧器，母線などの設備を保護する保護装置は、経済性を優先して一系列しか設置されない場合が多い。このような場合の保護システムは、保護設備としては当該設備を保護する保護装置と、当該設備を含んだ複数の設備を保護対象とする後備保護手段を有した保護装置から構成されている。
【０００３】
たとえば配電用変電所では受電用の変圧器，変圧器二次母線，配電線等で構成され、変圧器保護としては変圧器本体保護手段と、変圧器二次側母線，配電線を含めた変圧器二次側事故を検出する後備保護手段を有した保護装置が設備され、配電線保護としては配電線事故を検出する手段を持った保護装置が設備されている。
【０００４】
変圧器二次側の母線は母線事故時は変圧器を含めて停電とせざるを得ないため、変圧器保護装置の後備保護手段で保護している。変圧器の後備保護手段は配電線事故での配電線保護装置と協調をとった時間で、変圧器用遮断器を遮断するように構成されている。
【０００５】
各保護装置は最近ではマイクロコンピュータを使用したディジタル形の保護装置が適用され、自動監視手段により装置不良時を速やかに検出できるようにしている。保護装置に不良が生じた場合は外部に表示，警報を出力すると共に、装置からの遮断出力をロックするか、保護手段をロックするなどの処置をしている。
【０００６】
【発明が解決しようとする課題】
保護装置が１系列しか設置されない保護システムでは、各設備毎を保護対象とする保護装置に不良が生じた場合は当該設備を停止するか、停止できない場合は後備保護装置の時限を短縮して運用している。設備停止を行なう場合は停電を許容するか、迂回路を構成して負荷へ電力を供給する系統操作を行なう必要がある。又、設備停止できない場合の後備保護装置の時限短縮は、装置不良が生じた設備に事故が発生した場合、事故遮断は早くできるが広範囲の停電を生じる可能性がある。
【０００７】
本発明は上記課題を解決するためになされたものであり、保護装置が１系列しかない場合に、その装置に不良が生じた場合に当該設備を停止させず、又、当該設備に事故が発生しても、当該遮断器を後備保護と協調の取れた時間で遮断させ、停電範囲を拡大させない保護システムを提供することを目的としている。
【００１０】
【課題を解決するための手段】
本発明の[請求項１]に係る保護システムは、電力系統の送電線，母線，変圧器などの複数の設備を保護範囲とする後備保護手段を有する上位の保護装置と、前記した個々の各設備毎を保護対象とすると共に当該設備の事故時のみ動作する主検出手段と事故検出手段が共に動作した時に対応する遮断器を引き外す様にした下位の送電線保護装置とを備えた保護システムにおいて、前記主検出手段及び事故検出手段には夫々自動監視手段を設けると共に、前記上位の保護装置と下位の保護装置でする遮断指令出力は下記とした。
記
（イ）上位にある後備保護手段８１のみ動作で、下位の送電線保護装置９が不動作の場合、
上位にある後備保護手段からの出力によって、タイマー１６を介して上位遮断器ＣＢ５をトリップ。
（ロ）下位にある主検出手段９１１が事故検出し、同時に事故検出手段９２１が動作した場合、
下位にある遮断器ＣＢ６をトリップ。
（ハ）主検出手段９１１に不良が発生した場合、
保護装置に内蔵された自動監視手段９１２によって保護装置不良を検出して論理積回路２３の一方に出力する。この場合の送電線事故では後備保護手段の動作出力が発生するため前記論理積回路が出力し、タイマー２０によって下位遮断器ＣＢ６をトリップ。
（ニ）事故検出手段９２１が不良の場合
主検出手段９１１は健全であるため事故を検出し、後備保護手段８１の出力と自動監視手段９２２からの事故検出手段不良の出力とで論理積回路２４が出力し、タイマー２１によって下位遮断器ＣＢ６をトリップ。
但し、タイマー１６，２０，２１の時限は、タイマー１６＞タイマー２０＞タマー２１に設定される。
【００１１】
したがって保護装置が不良になった場合には当該設備の事故は保護装置では検出できないが、保護装置不良の内容によって、その保護範囲をカバーしている後備保護手段が動作したことを条件に、後備保護手段の本来の遮断指令時間と協調をとった時間で当該遮断器を遮断することによって、停電範囲を拡大することなく事故除去を図ることができる。
【００１２】
本発明の[請求項２]に係る保護システムは、電力系統の送電線，母線，変圧器などの複数の設備を保護範囲とする後備保護手段を有する上位の保護装置と、前記した個々の各設備毎を保護対象とすると共に当該設備の事故時のみ動作する主検出手段と事故検出手段が共に動作した時に対応する遮断器を引き外す様にした下位の送電線保護装置とを備えた保護システムにおいて、前記主検出手段及び事故検出手段には夫々自動監視手段を設けると共に、前記上位の保護装置と下位の保護装置でする遮断指令出力は下記とした。
記
（イ）上位にある後備保護手段８１のみ動作で、下位の送電線保護装置９が不動作の場合、
上位にある後備保護手段からの出力によって、タイマー１６を介して上位遮断器ＣＢ５をトリップ。
（ロ）下位にある主検出手段９１１が事故検出し、同時に事故検出手段９２１が動作した場合、
この場合は論理積回路２９が出力し、論理和回路２８を介して下位遮断器ＣＢ６をトリップ。
（ハ）保護装置に不良が発生した場合、
保護装置に内蔵の自動監視手段９１２，９２２によって不良を検出し、それが事故検出部の不良の場合であれば、当該事故設備は主検出部が健全であるため検出可能であり、この場合は後備保護手段の出力と当該設備の事故を検出できる主検出手段の動作と事故検出不良の条件で、論理回路２６が出力し、タイマー２７により下位遮断器ＣＢ６をトリップ。
但し、タイマー１６，２７の時限は、タイマー１６＞タイマー２７に設定される。
【００１３】
したがって保護装置不良が事故検出部の場合、その保護範囲をカバーしている後備保護手段が動作したことと、当該保護装置の主検出部が動作していることを条件に、後備保護手段の本来の遮断指令時間と協調をとった時間で当該遮断器を遮断することによって、停電範囲を拡大することなく事故除去を図ることができる。
【００１４】
【発明の実施の形態】
図１は電力系統とその保護設備を示し、電力系統は変電所の例で示している。なお、わかり易くするため以下の説明では後備保護装置を変圧器保護を対象に説明する。図１において、１は電源側母線、２は変圧器、３は変圧器二次側母線、４は送電線、５は変圧器用遮断器、６は送電線遮断器、７は保護設備のための計器用変成器、８は変圧器保護装置、９は送電線保護装置、１０は変圧器保護装置の後備保護手段の保護範囲を示し、１１は送電線保護装置の保護範囲を示している。図に示すように後備保護装置は当該設備の保護装置の保護範囲をカバーしている。
【００１５】
（第１の実施の形態）
図２は本発明の第１の実施の形態を示す構成図であり、遮断指令出力図として示す。図２において、図１と同一機能部分については同一符号を付して説明を省略する。即ち、変圧器保護装置８には後備保護手段８１があって、図１に示す各送電線の保護範囲１１を含む。又、送電線保護装置９には各設備毎の保護手段９１と各保護装置に内蔵された自動監視手段９２からなる。そしてこの自動監視手段は各設備毎の保護装置の不良を検出する。
【００１６】
１２は後備保護手段が動作した時の出力、１３は自動監視の不良検出出力、１４は保護装置の動作出力で遮断器６への遮断指令である。又、１６及び１７はタイマーであり、１６は後備保護手段８１が動作したことと装置不良の自動監視出力１３の条件で駆動される。なお、１６は後備保護手段８１が動作した時に遮断器５への遮断指令を出す時限を決めるものである。又、１５は論理積回路、１８は論理和回路で遮断器６への遮断指令を出力する。
【００１７】
なお、本実施の形態ではロジックシンボルで説明しているが、ディジタル形装置では当然のことながらソフトウェアで実現できることは言うまでもない。他の実施の形態も同様である。又、本発明を実施するに当たって、後備保護手段を有した保護装置で行なっても、各設備の保護装置で行なっても、それ以外の装置でこの手段を収納してもよい。
【００１８】
次に作用について説明する。保護装置に不良が発生した場合、保護装置に内蔵の自動監視手段９２によって不良を検出しそれを１３に出力する。系統に事故が発生し後備保護手段８１が動作するような事故の場合、その動作が１２に出力され、タイマー１６の時限後に所定の遮断器を遮断する指令を出すが、１３に出力がある場合、タイマー１６より短い時限のタイマー１７により、不良を生じている保護装置の保護対象設備の遮断器ＣＢ６に遮断指令を出す。
【００１９】
本実施の形態によれば、保護装置に不良が生じている時に、その設備に事故が発生しても他の装置の後備保護手段の動作を利用することによって、停電範囲を拡大することなく、事故遮断が可能になる。
【００２０】
（第２の実施の形態）
図３は本発明の第２の実施の形態を示す構成図であり、前記同様遮断指令出力図として示す。図３において、図２と同一機能部分については同一符号を付して説明を省略する。図２との差異は送電線保護装置９の構成である。即ち、送電線保護装置９は保護装置の当該設備の事故で動作する主検出部９１と、当該設備以外の事故でも動作する事故検出部９２とからなる。
【００２１】
又、主検出部９１は主検出手段９１１と前記主検出部の自動監視手段９１２とからなり、事故検出部９２は事故検出手段９２１と前記事故検出部の自動監視手段９２２とからなる。
【００２２】
１９は主検出と事故検出のいずれもが動作した時に遮断器へ遮断指令を出力する回路である。２０は主検出手段が不良の時に後備保護手段が動作した場合の協調用タイマーで、２１は事故検出手段が不良の時に後備保護手段が動作した場合の協調用タイマーである。いずれもこのタイマーの出力で不良を生じている保護装置の保護対象としている設備の遮断器へ遮断指令が与えられる。なお、２２〜２４は論理積回路、２５は論理和回路である。
【００２３】
次に作用について説明する。保護装置は一般に当該設備の事故で動作する主検出部と、当該設備以外の事故でも動作する事故検出部から構成され、遮断指令もこの２組のアンド条件の１９で出される。保護装置に不良が発生した場合、保護装置に内蔵の自動監視手段９１２，９２２によって不良を検出する。
【００２４】
事故検出部の不良の場合、当該事故設備は主検出部が健全であるため検出可能であり、この場合は後備保護手段の動作１２と事故検出不良の条件でタイマー１６より短い２１のタイマーにより遮断指令を出す。主検出部が不良の場合は後備保護手段が動作しても当該設備事故かどうかの判定はできないため、タイマー２１より時限が長く１６のタイマーより短い２０のタイマーにより遮断指令を出力する。
【００２５】
本実施の形態によれば、保護装置に不良が生じている時にその設備に事故が発生しても、他の装置の後備保護手段の動作を利用することによって、停電範囲を拡大することなく、又、その不良内容によって遮断時間も早くすることが可能になる。
【００２６】
（第３の実施の形態）
図４は本発明の第３の実施の形態を示す構成図であり、前記同様遮断指令出力図として示す。図４において、図３と同一機能部分については同一符号を付して説明を省略する。本実施の形態では保護装置に不良が生じている時にその設備に事故が発生しても、他の装置の後備保護手段の動作と、装置が不良であっても当該設備の事故を検出する主検出部が健全であれば、この条件を利用することによって停電範囲を拡大することなく遮断時間も早くしようとするものである。
【００２７】
そのための２７がタイマーであり、これは事故検出手段が不良の時に後備保護手段が動作した場合の協調用タイマーである。このタイマーの出力で不良を生じている保護装置の保護対象としている設備の遮断器へ遮断指令が与えられる。
【００２８】
次に作用について説明する。保護装置は一般に当該設備の事故で動作する主検出部と、当該設備以外の事故でも動作する事故検出部から構成され、遮断指令もこの２組のアンド条件の３０で出される。今、保護装置に不良が発生した場合、保護装置に内蔵の自動監視手段９１２，９２２によって不良を検出し、事故検出部の不良の場合、当該事故設備は主検出部が健全であるため検出可能であり、この場合は後備保護手段の動作１２と当該設備の事故を検出できる主検出手段の動作と事故検出不良の条件で、タイマー１６より短い２７のタイマーにより保護装置の保護対象としている設備の遮断器へ遮断指令を出す。
【００２９】
本実施の形態によれば、保護装置に不良が生じている時にその設備に事故が発生しても、他の装置の後備保護手段の動作と、装置が不良であっても当該設備の事故を検出できる主検出部が健全であればこの条件を利用することによって、停電範囲を拡大することなく遮断時間も早くすることが可能になる。
【００３０】
【発明の効果】
以上説明したように、本発明によれば保護装置が１系列で装置不良が生じても、後備保護手段を持つ保護装置の動作条件を使用することによって、事故範囲を限定し、停電範囲を拡大することなく事故遮断ができる。
【図面の簡単な説明】
【図１】本発明を説明する電力系統と保護装置の設置形態を示す図。
【図２】本発明の第１の実施の形態を示す構成図。
【図３】本発明の第２の実施の形態を示す構成図。
【図４】本発明の第３の実施の形態を示す構成図。
【符号の説明】
１電源側母線
２変圧器
３変圧器二次側母線
４送電線
５変圧器用遮断器
６送電線遮断器
７計器用変成器
８変圧器保護装置
９送電線保護装置
１０後備保護手段の保護範囲
１６，１７，２０，２１，２７タイマー
１５，２２，２３，２４，２６，２９論理積回路
１８，２５，２８論理和回路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protection system for protecting a power system.
[0002]
[Prior art]
In power transmission systems and distribution systems where the voltage class of the power system is low, protection devices that protect equipment such as transmission lines, transformers, and buses are often installed only in one line with priority given to economy. The protection system in such a case includes a protection device that protects the facility as a protection facility, and a protection device that has a back-up protection unit that protects a plurality of facilities including the facility.
[0003]
For example, a distribution substation consists of a receiving transformer, a transformer secondary bus, and a distribution line. For transformer protection, a transformer body protection means, a transformer secondary side bus, and a transformer including the distribution line are included. A protection device having a rear-end protection means for detecting a secondary side accident is installed, and as a distribution line protection, a protection device having a means for detecting a distribution line accident is installed.
[0004]
The bus on the secondary side of the transformer must be protected from power outage including the transformer in the event of a bus failure. The retrofit protection means of the transformer is configured to shut off the transformer circuit breaker in a time coordinated with the distribution line protection device in a distribution line accident.
[0005]
Recently, a digital type protection device using a microcomputer is applied to each protection device, and an automatic monitoring means can quickly detect a device failure. When a failure occurs in the protective device, a display or alarm is output to the outside, and measures such as locking the shut-off output from the device or locking the protective means are taken.
[0006]
[Problems to be solved by the invention]
In a protection system in which only one protection device is installed, if there is a failure in the protection device that is to be protected for each facility, the facility is stopped, or if the protection device cannot be stopped, the time limit of the back-up protection device is shortened. is doing. When shutting down the facility, it is necessary to allow a power failure or to configure a detour to perform system operation to supply power to the load. In addition, when the equipment can not be stopped, the time limit of the back-up protection device can be quickly shut down when an accident occurs in the equipment in which the equipment is defective, but there is a possibility that a wide range of power failure may occur.
[0007]
The present invention has been made in order to solve the above-mentioned problems. When there is only one protection device, the equipment is not stopped when a failure occurs in the equipment, and an accident occurs in the equipment. Even so, an object of the present invention is to provide a protection system in which the circuit breaker is interrupted in a time coordinated with the protection of the back-up and does not expand the power outage range.
[0010]
[Means for Solving the Problems]
Protection system according to the claim 1 of the present invention, transmission lines of the power system, bus, and a protective device of the upper to have a backup protection means to protect the range several facilities, such as transformers, the individual who the Protection with each main equipment to be protected and a main detection means that operates only at the time of an accident of the equipment and a lower-level transmission line protection device that trips the corresponding circuit breaker when the accident detection means operates together In the system, the main detection means and the accident detection means are each provided with automatic monitoring means, and the shut-off command output by the upper protection device and the lower protection device is as follows .
Record
(B) Only the supplementary protection means 81 at the upper level operates and the lower level transmission line protection device 9 does not operate.
Trips the upper circuit breaker CB5 via the timer 16 by the output from the rear protection means at the upper level.
(B) When the main detection means 911 at the lower level detects an accident and the accident detection means 921 operates at the same time,
Trip the breaker CB6 at the lower level.
(C) When a failure occurs in the main detection means 911,
The automatic monitoring means 912 built in the protection device detects a failure of the protection device and outputs it to one of the AND circuits 23. In this case, since the operation output of the supplementary protection means is generated in the power transmission line accident, the AND circuit outputs it, and the timer 20 trips the lower circuit breaker CB6.
(D) When the accident detection means 921 is defective
Since the main detection means 911 is healthy, it detects an accident, and the AND circuit 24 outputs the output of the rear-end protection means 81 and the output of the failure detection means failure from the automatic monitoring means 922, and the timer 21 outputs the lower circuit breaker CB6. Trip.
However, the timers 16, 20, and 21 are set so that timer 16> timer 20> tamar 21.
[0011]
Therefore, when a protective device becomes defective, the accident of the equipment cannot be detected by the protective device, but the protective equipment that covers the protection range is activated depending on the content of the protective device failure. By disconnecting the circuit breaker in a time coordinated with the original shutoff command time of the protection means, it is possible to eliminate the accident without expanding the power outage range.
[0012]
The protection system according to [Claim 2 ] of the present invention includes a higher-level protection device having a backup protection means for protecting a plurality of facilities such as a transmission line, a bus, and a transformer of a power system, and each of the above-described individual protection devices. protection system comprising a lower transmission line protection device was set to tripping a circuit breaker corresponding to when the main detecting unit and the fault detection means operative only during an accident of the equipment has operated together with the respective equipment to be protected In the above, the main detection means and the accident detection means are each provided with automatic monitoring means, and the shut-off command output by the upper protection device and the lower protection device is as follows .
Record
(B) Only the supplementary protection means 81 at the upper level operates and the lower level transmission line protection device 9 does not operate.
Trips the upper circuit breaker CB5 via the timer 16 by the output from the rear protection means at the upper level.
(B) When the main detection means 911 at the lower level detects an accident and the accident detection means 921 operates at the same time,
In this case, the AND circuit 29 outputs and trips the lower circuit breaker CB6 via the OR circuit 28.
(C) If a defect occurs in the protective device,
If the failure is detected by the automatic monitoring means 912 and 922 built in the protective device and it is a failure of the accident detection unit, the accident facility can be detected because the main detection unit is healthy. The logic circuit 26 outputs the trip of the lower circuit breaker CB6 by the timer 27 under the condition of the output of the rear protection means, the operation of the main detection means capable of detecting an accident of the equipment and the fault detection failure.
However, the time limits of the timers 16 and 27 are set such that timer 16> timer 27.
[0013]
Therefore, if the protection device failure is an accident detection unit, the original protection device protection means that the protection device that covers the protection range has been activated and the main detection unit of the protection device is operating. By disconnecting the circuit breaker at a time coordinated with the interruption command time, it is possible to eliminate the accident without expanding the power outage range.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a power system and its protection equipment, and the power system is shown as an example of a substation. In addition, in order to make it easy to understand, in the following description, the back-end protection device will be described for the protection of the transformer. In FIG. 1, 1 is a power supply side bus, 2 is a transformer, 3 is a transformer secondary side bus, 4 is a power transmission line, 5 is a transformer circuit breaker, 6 is a power line breaker, and 7 is for protection equipment. An instrument transformer, 8 is a transformer protection device, 9 is a transmission line protection device, 10 is a protection range of a rear protection means of the transformer protection device, and 11 is a protection range of the transmission line protection device. As shown in the figure, the rear protection device covers the protection range of the protection device of the facility.
[0015]
(First embodiment)
FIG. 2 is a block diagram showing the first embodiment of the present invention, which is shown as a shut-off command output diagram. In FIG. 2, the same functional parts as those in FIG. In other words, the transformer protection device 8 has the supplementary protection means 81 and includes the protection range 11 of each transmission line shown in FIG. The power transmission line protection device 9 includes protection means 91 for each facility and automatic monitoring means 92 built in each protection device. And this automatic monitoring means detects the defect of the protection apparatus for every equipment.
[0016]
Reference numeral 12 is an output when the rear protection means is operated, 13 is an automatic monitoring failure detection output, and 14 is an operation output of the protective device, which is a shut-off command to the circuit breaker 6. Reference numerals 16 and 17 denote timers, and 16 is driven on the condition that the back-up protection means 81 has been operated and the automatic monitoring output 13 for device failure. In addition, 16 determines the time limit which issues the interruption | blocking instruction | command to the circuit breaker 5 when the back protection means 81 operate | moves. Further, 15 is a logical product circuit, and 18 is a logical sum circuit, which outputs a cutoff command to the circuit breaker 6.
[0017]
In the present embodiment, logic symbols are used for explanation, but it goes without saying that digital devices can be realized by software. The same applies to the other embodiments. In carrying out the present invention, this means may be accommodated by a protection device having a supplementary protection means, by a protection device of each facility, or by other devices.
[0018]
Next, the operation will be described. When a failure occurs in the protection device, the failure is detected by the automatic monitoring means 92 built in the protection device and output to 13. When an accident occurs in the system and the equipment protection means 81 operates, the operation is output to 12 and a command to shut off a predetermined circuit breaker is issued after the timer 16 expires. Then, a shut-off command is issued to the circuit breaker CB6 of the protection target equipment of the protection device in which the failure is caused by the timer 17 having a time shorter than the timer 16.
[0019]
According to this embodiment, when a failure occurs in the protective device, even if an accident occurs in the equipment, by using the operation of the back-up protection means of other equipment, without expanding the power outage range, Accident blocking is possible.
[0020]
(Second Embodiment)
FIG. 3 is a block diagram showing a second embodiment of the present invention, which is shown as a shut-off command output diagram as described above. In FIG. 3, the same functional parts as those in FIG. The difference from FIG. 2 is the configuration of the power transmission line protection device 9. That is, the power transmission line protection device 9 includes a main detection unit 91 that operates due to an accident of the equipment of the protection device, and an accident detection unit 92 that operates even in an accident other than the equipment.
[0021]
The main detection unit 91 includes a main detection unit 911 and an automatic monitoring unit 912 of the main detection unit, and the accident detection unit 92 includes an accident detection unit 921 and an automatic monitoring unit 922 of the accident detection unit.
[0022]
Reference numeral 19 denotes a circuit for outputting a break command to the circuit breaker when both main detection and accident detection are activated. Reference numeral 20 denotes a cooperation timer when the back-up protection means operates when the main detection means is defective, and reference numeral 21 denotes a cooperation timer when the back-up protection means operates when the accident detection means is defective. In any case, a shut-off command is given to the circuit breaker of the equipment that is the protection target of the protection device that has failed due to the output of this timer. Reference numerals 22 to 24 are AND circuits, and 25 is an OR circuit.
[0023]
Next, the operation will be described. The protective device is generally composed of a main detection unit that operates in an accident of the facility and an accident detection unit that operates in an accident other than the facility, and a shut-off command is also issued in 19 of these two AND conditions. When a failure occurs in the protection device, the failure is detected by automatic monitoring means 912 and 922 built in the protection device.
[0024]
If the accident detection unit is defective, the accident facility can be detected because the main detection unit is healthy, and in this case, it is shut off by 21 timers shorter than the timer 16 under the condition of operation 12 of the rear-end protection means and fault detection failure. Issue a command. If the main detection unit is defective, it cannot be determined whether or not the equipment accident has occurred even if the back-up protection means operates. Therefore, the shut-off command is output by 20 timers that are longer than the timer 21 and shorter than the 16 timers.
[0025]
According to this embodiment, even if an accident occurs in the equipment when a failure occurs in the protection device, by using the operation of the back-up protection means of another device, without extending the power outage range, In addition, the interruption time can be shortened depending on the contents of the defect.
[0026]
(Third embodiment)
FIG. 4 is a block diagram showing a third embodiment of the present invention, which is shown as a shut-off command output diagram as described above. In FIG. 4, the same functional parts as those in FIG. In this embodiment, even if an accident occurs in the equipment when the protective device is defective, the operation of other equipment's back-up protection means, and even if the equipment is defective, the main equipment detects the accident in the equipment. If the detection unit is healthy, by using this condition, the interruption time is attempted to be shortened without expanding the power failure range.
[0027]
For that purpose, 27 is a timer, which is a cooperation timer when the rear-end protection means operates when the accident detection means is defective. A shut-off command is given to the circuit breaker of the equipment that is the protection target of the protection device that has failed due to the output of this timer.
[0028]
Next, the operation will be described. The protection device is generally composed of a main detection unit that operates in an accident of the facility and an accident detection unit that operates in an accident other than the facility, and a shut-off command is also issued in 30 of these two AND conditions. Now, when a failure occurs in the protection device, the failure is detected by automatic monitoring means 912 and 922 built in the protection device. If the failure detection unit is defective, the accident equipment can be detected because the main detection unit is healthy. In this case, the operation of the equipment to be protected by the protection device is performed by 27 timers shorter than the timer 16 under the conditions of the operation 12 of the back-up protection means, the operation of the main detection means capable of detecting an accident of the equipment and the fault detection failure. Send a break command to the breaker.
[0029]
According to the present embodiment, even if an accident occurs in the equipment when the protective device is defective, the operation of other equipment's back-up protection means, and even if the equipment is defective, If the main detection unit that can be detected is healthy, the interruption time can be shortened without expanding the power outage range by using this condition.
[0030]
【The invention's effect】
As described above, according to the present invention, even if a device failure occurs in a single system, the accident range is limited and the power outage range is expanded by using the operating conditions of the protective device having the backup protection means. The accident can be cut off without doing it.
[Brief description of the drawings]
FIG. 1 is a diagram showing an installation form of a power system and a protection device for explaining the present invention.
FIG. 2 is a configuration diagram showing a first embodiment of the present invention.
FIG. 3 is a configuration diagram showing a second embodiment of the present invention.
FIG. 4 is a configuration diagram showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power supply side bus 2 Transformer 3 Transformer secondary side bus 4 Transmission line 5 Transformer circuit breaker 6 Transmission line circuit breaker 7 Instrument transformer 8 Transformer protection device 9 Transmission line protection device 10 Protective range of back protection means 16 , 17, 20, 21, 27 Timer 15, 22, 23, 24, 26, 29 AND circuit 18, 25, 28 OR circuit

Claims

Transmission lines of the power system, bus, an accident of the facilities as well as a protector of the upper to have a backup protection means a plurality of equipment and scope of such transformers, and protected individual to each equipment described above In a protection system comprising a main transmission means that operates only and a subordinate power transmission line protection device that trips a corresponding circuit breaker when both of the accident detection means operate , the main detection means and the accident detection means each include A protection system in which an automatic monitoring means is provided, and the shutoff command output from the upper protection device and the lower protection device is as follows .
Record
(B) Only the supplementary protection means 81 at the upper level operates and the lower level transmission line protection device 9 does not operate.
Trips the upper circuit breaker CB5 via the timer 16 by the output from the rear protection means at the upper level.
(B) When the main detection means 911 at the lower level detects an accident and the accident detection means 921 operates at the same time,
Tripped low-order circuit breaker CB6.
(C) When a failure occurs in the main detection means 911,
The automatic monitoring means 912 built in the protection device detects a failure of the protection device and outputs it to one of the AND circuits 23. In this case, since the operation output of the supplementary protection means is generated in the power transmission line accident, the AND circuit outputs it, and the timer 20 trips the lower circuit breaker CB6.
(D) When the accident detection means 921 is defective
Since the main detection means 911 is healthy, it detects an accident, and the AND circuit 24 outputs the output of the rear-end protection means 81 and the output of the failure detection means failure from the automatic monitoring means 922, and the timer 21 outputs the lower circuit breaker CB6. Trip.
However, the timers 16, 20, and 21 are set so that timer 16> timer 20> tamar 21.

Transmission lines of the power system, bus, only when an accident of the facilities as well as a protector of the upper having a backup protection means to protect the range several facilities, such as transformers, and protected individual to each equipment described above In a protection system comprising a subordinate power transmission line protection device that trips a corresponding circuit breaker when both the main detection means that operates and the accident detection means operate, the main detection means and the accident detection means are each automatically A protection system characterized in that a monitoring unit is provided, and shut-off command outputs from the upper protection device and the lower protection device are as follows .
Record
(B) Only the supplementary protection means 81 at the upper level operates and the lower level transmission line protection device 9 does not operate.
Trips the upper circuit breaker CB5 via the timer 16 by the output from the rear protection means at the upper level.
(B) When the main detection means 911 at the lower level detects an accident and the accident detection means 921 operates at the same time,
In this case, the AND circuit 29 outputs and trips the lower circuit breaker CB6 via the OR circuit 28.
(C) If a defect occurs in the protective device,
If the failure is detected by the automatic monitoring means 912 and 922 built in the protective device and it is a failure of the accident detection unit, the accident facility can be detected because the main detection unit is healthy. The logic circuit 26 outputs the trip of the lower circuit breaker CB6 by the timer 27 under the condition of the output of the rear protection means, the operation of the main detection means capable of detecting an accident of the equipment and the fault detection failure.
However, the time limits of the timers 16 and 27 are set such that timer 16> timer 27.