JP3223302B2 - Power system protection device - Google Patents
Power system protection deviceInfo
- Publication number
- JP3223302B2 JP3223302B2 JP33844391A JP33844391A JP3223302B2 JP 3223302 B2 JP3223302 B2 JP 3223302B2 JP 33844391 A JP33844391 A JP 33844391A JP 33844391 A JP33844391 A JP 33844391A JP 3223302 B2 JP3223302 B2 JP 3223302B2
- Authority
- JP
- Japan
- Prior art keywords
- trip
- signal
- bus
- circuit breaker
- ground fault
- 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.)
- Expired - Fee Related
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電力系統保護装置に係
り、特に、複数の母線が母線連絡遮断器を介して接続さ
れた電力系統において、系統に地絡事故が発生したとき
などに系統を保護するに好適な電力系統保護装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system protection apparatus, and more particularly to a power system in which a plurality of buses are connected via a bus communication circuit breaker when a ground fault occurs in the system. The present invention relates to a power system protection device suitable for protection.
【０００２】[0002]
【従来の技術】電力系統においては、複数の母線を母線
連絡遮断器を介して接続し、一方の母線から他方の母線
へ電力を供給するシステムが採用されている。このよう
な構成を採用すると、一方の母線の電源が故障した場合
でも、他方の母線の電源から各母線の負荷に電力を供給
することができる。そして各母線で地絡事故などが生じ
たときには各母線毎に配置された遮断器をトリップさせ
ることによって系統を保護するようになっている。2. Description of the Related Art In a power system, a system in which a plurality of buses are connected via a bus communication circuit breaker and power is supplied from one bus to the other bus is employed. With such a configuration, even if the power supply of one bus fails, power can be supplied from the power supply of the other bus to the load of each bus. When a ground fault or the like occurs in each bus, the system is protected by tripping circuit breakers arranged for each bus.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来技術で
は、各母線が母線連絡遮断器を介して接続されていると
きに一方の母線で地絡事故が生じると、各母線に地絡電
流が流れ、各母線の遮断器が共にトリップし健全な母線
の負荷に電力を供給することができなくなる。すなわち
一方の系統で地絡事故が生じたときでも各母線に接続さ
れた負荷に電力が供給されなくなり、停電範囲が広くな
るという不具合がある。However, in the prior art, when a ground fault occurs in one bus while each bus is connected via a bus communication circuit breaker, a ground fault current flows in each bus. Then, the circuit breakers of each bus trip together, and it becomes impossible to supply power to the load of the healthy bus. That is, even when a ground fault occurs in one system, power is not supplied to the loads connected to the buses, and the power failure range is widened.
【０００４】なお、特開昭５４−１５１４７号公報に記
載されているように、各母線に地絡電流が流れたときに
母線連絡遮断器をトリップし、その後一方の母線の遮断
器をトリップするようにすれば停電範囲を極小化するこ
とも可能である。しかし、この方法を単に採用しても、
キープリレーの作動状態によっては各母線のキープリレ
ーの接点が同時に閉じた状態となり、母線連絡遮断器が
トリップされると共に各母線の遮断器がトリップされ、
事故の生じた母線のみを確実にトリップすることができ
なくなる。[0004] As described in Japanese Patent Application Laid-Open No. 54-15147, when a ground fault current flows in each bus, the bus communication circuit breaker is tripped, and then the circuit breaker of one bus is tripped. By doing so, it is possible to minimize the power failure range. However, simply adopting this method,
Depending on the operation state of the keep relay, the contacts of the keep relay of each bus are simultaneously closed, the bus connection breaker is tripped, and the breaker of each bus is tripped,
Only the bus where the accident has occurred cannot be reliably tripped.
【０００５】本発明の目的は、各母線中の遮断器のうち
事故の生じた母線の遮断器のみを確実にトリップさせる
ことができる電力系統保護装置を提供することにある。An object of the present invention is to provide a power system protection device that can reliably trip only a circuit breaker of a bus in which an accident has occurred among circuit breakers in each bus.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、第１の装置として、第１交流電源と第１
負荷とを結ぶ第１母線中に挿入された第１遮断器と、第
２交流電源と第２負荷とを結ぶ第２母線中に挿入された
第２遮断器と、第１遮断器の出力側と第２遮断器の出力
側とを結ぶ母線連絡線中に挿入された母線連絡遮断器
と、第１母線に地絡に伴う電気信号が発生したことを検
出する第１地絡検出手段と、第２母線に地絡に伴う電気
信号が発生したことを検出する第２地絡検出手段と、第
１母線と第２母線のうちいずれか一方の母線に地絡に伴
う電気信号が発生したことを検出する第３地絡検出手段
と、母線連絡遮断器がトリップしたことを検出するトリ
ップ検出手段と、第１地絡検出手段の検出出力と第３地
絡検出手段の検出出力との論理積を条件に第１起動信号
を出力する第１起動信号発生手段と、第２地絡検出手段
の検出出力と第３地絡検出手段の検出出力との論理積を
条件に第２起動信号を出力する第２起動信号発生手段
と、第１起動信号を一定時間以上入力したときに第１タ
イマ信号を出力する第１タイマと、第２起動信号を一定
時間以上入力したときに第２タイマ信号を出力する第２
タイマと、第１タイマ信号とトリップ検出手段の検出出
力との論理積を条件に第１トリップ信号を出力する第１
トリップ信号発生手段と、第２タイマ信号とトリップ検
出手段の検出出力との論理積を条件に第２トリップ信号
を出力する第２トリップ信号発生手段と、第１トリップ
信号により第１遮断器をトリップする第１トリップ手段
と、第２トリップ信号により第２遮断器をトリップする
第２トリップ手段と、トリップ検出手段の検出出力によ
り母線連絡遮断器をトリップする第３トリップ手段とを
備えている電力系統保護装置を構成したものである。In order to achieve the above object, the present invention provides a first device comprising a first AC power source and a first AC power source.
A first circuit breaker inserted in a first bus connecting the load, a second circuit breaker inserted in a second bus connecting the second AC power supply and the second load, and an output side of the first circuit breaker A bus connection circuit breaker inserted in a bus connection line connecting the output side of the second circuit breaker, and first ground fault detection means for detecting that an electric signal associated with a ground fault has occurred in the first bus, A second ground fault detecting means for detecting that an electric signal associated with a ground fault has occurred in the second bus, and an electric signal associated with a ground fault occurring in one of the first bus and the second bus. , A trip detecting means for detecting that the bus communication circuit breaker has tripped, and a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means. A first activation signal generating means for outputting a first activation signal on condition of: a detection output of a second ground fault detecting means; A second activation signal generating means for outputting a second activation signal on condition of a logical product of a detection output of the detection means, and a first timer for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more. Outputting a second timer signal when the second start signal is input for a predetermined time or more.
A first timer for outputting a first trip signal on condition of a logical product of a timer, a first timer signal and a detection output of the trip detecting means;
Trip signal generating means, second trip signal generating means for outputting a second trip signal on condition of a logical product of the second timer signal and the detection output of the trip detecting means, and tripping the first circuit breaker by the first trip signal. And a third trip means for tripping the bus connection circuit breaker based on a detection output of the trip detecting means. This constitutes a protection device.
【０００７】第２の装置として、交流電源に接続された
変圧器と第１負荷とを結ぶ第１母線中に挿入された第１
遮断器と、発電機と第２負荷とを結ぶ第２母線中に挿入
された第２遮断器と、第１遮断器の出力側と第２遮断器
の出力側とを結ぶ母線連絡線中に挿入された母線連絡遮
断器と、第１母線に地絡に伴う電気信号が発生したこと
を検出する第１地絡検出手段と、第２母線に地絡に伴う
電気信号が発生したことを検出する第２地絡検出手段
と、第１母線と第２母線のうちいずれか一方の母線に地
絡に伴う電気信号が発生したことを検出する第３地絡検
出手段と、母線連絡遮断器がトリップしたことを検出す
るトリップ検出手段と、第１地絡検出手段の検出出力と
第３地絡検出手段の検出出力との論理積を条件に第１起
動信号を出力する第１起動信号発生手段と、第２地絡検
出手段の検出出力と第３地絡検出手段の検出出力との論
理積を条件に第２起動信号を出力する第２起動信号発生
手段と、第１起動信号を一定時間以上入力したときに第
１タイマ信号を出力する第１タイマと、第２起動信号を
一定時間以上入力したときに第２タイマ信号を出力する
第２タイマと、第１タイマ信号とトリップ検出手段の検
出出力との論理積を条件に第１トリップ信号を出力する
第１トリップ信号発生手段と、第２タイマ信号とトリッ
プ検出手段の検出出力との論理積を条件に第２トリップ
信号を出力する第２トリップ信号発生手段と、第１トリ
ップ信号により第１遮断器をトリップする第１トリップ
手段と、第２トリップ信号により第２遮断器をトリップ
する第２トリップ手段と、トリップ検出手段の検出出力
により母線連絡遮断器をトリップする第３トリップ手段
とを備えている電力系統保護装置を構成したものであ
る。As a second device, a first device inserted into a first bus connecting a transformer connected to an AC power supply and a first load.
A circuit breaker, a second circuit breaker inserted into a second bus connecting the generator and the second load, and a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. An inserted busbar breaker, first ground fault detecting means for detecting the occurrence of an electrical signal associated with a ground fault in the first bus, and detecting occurrence of an electrical signal associated with a ground fault in the second bus. A second ground fault detecting means, a third ground fault detecting means for detecting occurrence of an electric signal associated with a ground fault in one of the first bus and the second bus, and a bus communication breaker. Trip detecting means for detecting that a trip has occurred, and first starting signal generating means for outputting a first starting signal on condition of a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means. And the second output under the condition of the logical product of the detection output of the second ground fault detection means and the detection output of the third ground fault detection means. A second activation signal generating means for outputting a signal, a first timer for outputting a first timer signal when the first activation signal is input for a predetermined time or more, and a second timer for outputting a first timer signal when the second activation signal is input for a certain time or more. A second timer for outputting a timer signal, a first trip signal generating means for outputting a first trip signal on condition of a logical product of the first timer signal and a detection output of the trip detecting means, a second timer signal and a trip detection A second trip signal generating means for outputting a second trip signal on condition of a logical product of the detection output of the means, a first trip means for tripping the first breaker by the first trip signal, and a second trip signal by the second trip signal. 2 The power system protection device includes a second trip means for tripping the circuit breaker, and a third trip means for tripping the busbar circuit breaker based on a detection output of the trip detection means. One in which the.
【０００８】第３の装置として、第１交流電源に接続さ
れた第１変圧器と第１負荷とを結ぶ第１母線中に挿入さ
れた第１遮断器と、第２交流電源に接続された第２変圧
器と第２負荷とを結ぶ第２母線中に挿入された第２遮断
器と、第１遮断器の出力側と第２遮断器の出力側とを結
ぶ母線連絡線中に挿入された母線連絡遮断器と、第１母
線に地絡に伴う電気信号が発生したことを検出する第１
地絡検出手段と、第２母線に地絡に伴う電気信号が発生
したことを検出する第２地絡検出手段と、第１母線と第
２母線のうちいずれか一方の母線に地絡に伴う電気信号
が発生したことを検出する第３地絡検出手段と、母線連
絡遮断器がトリップしたことを検出するトリップ検出手
段と、第１地絡検出手段の検出出力と第３地絡検出手段
の検出出力との論理積を条件に第１起動信号を出力する
第１起動信号発生手段と、第２地絡検出手段の検出出力
と第３地絡検出手段の検出出力との論理積を条件に第２
起動信号を出力する第２起動信号発生手段と、第１起動
信号を一定時間以上入力したときに第１タイマ信号を出
力する第１タイマと、第２起動信号を一定時間以上入力
したときに第２タイマ信号を出力する第２タイマと、第
１タイマ信号とトリップ検出手段の検出出力との論理積
を条件に第１トリップ信号を出力する第１トリップ信号
発生手段と、第２タイマ信号とトリップ検出手段の検出
出力との論理積を条件に第２トリップ信号を出力する第
２トリップ信号発生手段と、第１トリップ信号により第
１遮断器をトリップする第１トリップ手段と、第２トリ
ップ信号により第２遮断器をトリップする第２トリップ
手段と、トリップ検出手段の検出出力により母線連絡遮
断器をトリップする第３トリップ手段とを備えている電
力系統保護装置を構成したものである。As a third device, a first circuit breaker inserted in a first bus connecting the first transformer connected to the first AC power supply and the first load, and a second circuit connected to the second AC power supply. A second circuit breaker inserted in a second bus connecting the second transformer and the second load, and a second circuit breaker inserted in a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. And a first bus that detects the occurrence of an electrical signal associated with a ground fault in the first bus.
A ground fault detecting means, a second ground fault detecting means for detecting that an electric signal associated with the ground fault is generated in the second bus, and a ground fault in one of the first bus and the second bus. A third ground fault detecting means for detecting that an electric signal has been generated, a trip detecting means for detecting that the bus communication breaker has tripped, a detection output of the first ground fault detecting means and a third ground fault detecting means; A first activation signal generating means for outputting a first activation signal on condition of a logical product of the detection output and a logical product of a detection output of the second ground fault detecting means and a detection output of the third ground fault detecting means. Second
A second start signal generating means for outputting a start signal, a first timer for outputting a first timer signal when the first start signal is input for a predetermined time or more, and a second timer for outputting a first timer signal for a predetermined time or more. A second timer for outputting a second timer signal, a first trip signal generating means for outputting a first trip signal on condition of a logical product of the first timer signal and a detection output of the trip detecting means, a second timer signal and a trip. A second trip signal generating means for outputting a second trip signal on condition of a logical product of a detection output of the detecting means, a first trip means for tripping the first circuit breaker by the first trip signal, and a second trip signal by the second trip signal A power system protection device comprising: a second trip means for tripping the second circuit breaker; and a third trip means for tripping the bus connection circuit breaker based on a detection output of the trip detection means. Are those that form.
【０００９】第４の装置として、第１交流電源と第１負
荷とを結ぶ第１母線中に挿入された第１遮断器と、第２
交流電源と第２負荷とを結ぶ第２母線中に挿入された第
２遮断器と、第１遮断器の出力側と第２遮断器の出力側
とを結ぶ母線連絡線中に挿入された母線連絡遮断器と、
第１母線に発生する零相電流から地絡を検出する第１地
絡検出手段と、第２母線に発生する零相電流から地絡を
検出する第２地絡検出手段と、第１母線と第２母線のう
ちいずれか一方の母線に発生する零相電流から地絡を検
出する第３地絡検出手段と、母線連絡遮断器がトリップ
したことを検出するトリップ検出手段と、第１地絡検出
手段の検出出力と第３地絡検出手段の検出出力との論理
積を条件に第１起動信号を出力する第１起動信号発生手
段と、第２地絡検出手段の検出出力と第３地絡検出手段
の検出出力との論理積を条件に第２起動信号を出力する
第２起動信号発生手段と、第１起動信号を一定時間以上
入力したときに第１タイマ信号を出力する第１タイマ
と、第２起動信号を一定時間以上入力したときに第２タ
イマ信号を出力する第２タイマと、第１タイマ信号とト
リップ検出手段の検出出力との論理積を条件に第１トリ
ップ信号を出力する第１トリップ信号発生手段と、第２
タイマ信号とトリップ検出手段の検出出力との論理積を
条件に第２トリップ信号を出力する第２トリップ信号発
生手段と、第１トリップ信号により第１遮断器をトリッ
プする第１トリップ手段と、第２トリップ信号により第
２遮断器をトリップする第２トリップ手段と、トリップ
検出手段の検出出力により母線連絡遮断器をトリップす
る第３トリップ手段とを備えている電力系統保護装置を
構成したものである。As a fourth device, a first breaker inserted in a first bus connecting the first AC power supply and the first load,
A second circuit breaker inserted in a second bus connecting the AC power supply and the second load, and a bus inserted in a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. Communication breaker,
A first ground fault detecting means for detecting a ground fault from a zero-sequence current generated in the first bus, a second ground fault detecting means for detecting a ground fault from a zero-sequence current generated in the second bus, Third ground fault detecting means for detecting a ground fault from a zero-phase current generated in one of the second buses, trip detecting means for detecting that the bus communication circuit breaker has tripped, and first ground fault First activation signal generation means for outputting a first activation signal on condition of a logical product of a detection output of the detection means and a detection output of the third ground fault detection means, a detection output of the second ground fault detection means and a third ground A second activation signal generating means for outputting a second activation signal on condition of a logical product of the detection output of the short detection means and a first timer for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more And output a second timer signal when the second start signal is input for a predetermined time or more. And second timer, the first trip signal generating means for outputting a first trip signal to condition the logical product of the detection output of the first timer signal and the trip detection means, second
A second trip signal generating means for outputting a second trip signal on condition of a logical product of the timer signal and a detection output of the trip detecting means; a first trip means for tripping the first breaker by the first trip signal; The power system protection apparatus comprises a second trip means for tripping the second circuit breaker in response to a two trip signal, and a third trip means for tripping the bus connection circuit breaker in response to a detection output of the trip detecting means. .
【００１０】第５の装置として、交流電源に接続された
変圧器と第１負荷とを結ぶ第１母線中に挿入された第１
遮断器と、発電機と第２負荷とを結ぶ第２母線中に挿入
された第２遮断器と、第１遮断器の出力側と第２遮断器
の出力側とを結ぶ母線連絡線中に挿入された母線連絡遮
断器と、第１母線に発生する零相電流から地絡を検出す
る第１地絡検出手段と、第２母線に発生する零相電流か
ら地絡を検出する第２地絡検出手段と、第１母線と第２
母線のうちいずれか一方の母線に発生する零相電流から
地絡を検出する第３地絡検出手段と、母線連絡遮断器が
トリップしたことを検出するトリップ検出手段と、第１
地絡検出手段の検出出力と第３地絡検出手段の検出出力
との論理積を条件に第１起動信号を出力する第１起動信
号発生手段と、第２地絡検出手段の検出出力と第３地絡
検出手段の検出出力との論理積を条件に第２起動信号を
出力する第２起動信号発生手段と、第１起動信号を一定
時間以上入力したときに第１タイマ信号を出力する第１
タイマと、第２起動信号を一定時間以上入力したときに
第２タイマ信号を出力する第２タイマと、第１タイマ信
号とトリップ検出手段の検出出力との論理積を条件に第
１トリップ信号を出力する第１トリップ信号発生手段
と、第２タイマ信号とトリップ検出手段の検出出力との
論理積を条件に第２トリップ信号を出力する第２トリッ
プ信号発生手段と、第１トリップ信号により第１遮断器
をトリップする第１トリップ手段と、第２トリップ信号
により第２遮断器をトリップする第２トリップ手段と、
トリップ検出手段の検出出力により母線連絡遮断器をト
リップする第３トリップ手段とを備えている電力系統保
護装置を構成したものである。As a fifth device, a first device inserted in a first bus connecting a transformer connected to an AC power supply and a first load.
A circuit breaker, a second circuit breaker inserted into a second bus connecting the generator and the second load, and a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. An inserted busbar breaker, first ground fault detecting means for detecting a ground fault from a zero-phase current generated in the first bus, and second ground detecting a ground fault from a zero-phase current generated in the second bus. And a first bus and a second bus.
Third ground fault detecting means for detecting a ground fault from a zero-phase current generated in one of the buses, trip detecting means for detecting that the bus communication circuit breaker has tripped,
A first start signal generating means for outputting a first start signal on condition of a logical product of a detection output of the ground fault detecting means and a detection output of the third ground fault detecting means; A second activation signal generating means for outputting a second activation signal on condition of a logical product of the detection output of the three ground fault detecting means, and a second timer signal for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more. 1
A timer, a second timer for outputting a second timer signal when the second start signal is input for a predetermined time or more, and a first trip signal on the condition of a logical product of the first timer signal and a detection output of the trip detecting means. A first trip signal generating means for outputting, a second trip signal generating means for outputting a second trip signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means, and a first trip signal based on the first trip signal. First trip means for tripping the circuit breaker, second trip means for tripping the second circuit breaker according to the second trip signal,
And a third trip means for tripping the bus communication circuit breaker based on a detection output of the trip detection means.
【００１１】第６の装置として、第１交流電源に接続さ
れた第１変圧器と第１負荷とを結ぶ第１母線中に挿入さ
れた第１遮断器と、第２交流電源に接続された第２変圧
器と第２負荷とを結ぶ第２母線中に挿入された第２遮断
器と、第１遮断器の出力側と第２遮断器の出力側とを結
ぶ母線連絡線中に挿入された母線連絡遮断器と、第１母
線に発生する零相電流から地絡を検出する第１地絡検出
手段と、第２母線に発生する零相電流から地絡を検出す
る第２地絡検出手段と、第１母線と第２母線のうちいず
れか一方の母線に発生する零相電流から地絡を検出する
第３地絡検出手段と、母線連絡遮断器がトリップしたこ
とを検出するトリップ検出手段と、第１地絡検出手段の
検出出力と第３地絡検出手段の検出出力との論理積を条
件に第１起動信号を出力する第１起動信号発生手段と、
第２地絡検出手段の検出出力と第３地絡検出手段の検出
出力との論理積を条件に第２起動信号を出力する第２起
動信号発生手段と、第１起動信号を一定時間以上入力し
たときに第１タイマ信号を出力する第１タイマと、第２
起動信号を一定時間以上入力したときに第２タイマ信号
を出力する第２タイマと、第１タイマ信号とトリップ検
出手段の検出出力との論理積を条件に第１トリップ信号
を出力する第１トリップ信号発生手段と、第２タイマ信
号とトリップ検出手段の検出出力との論理積を条件に第
２トリップ信号を出力する第２トリップ信号発生手段
と、第１トリップ信号により第１遮断器をトリップする
第１トリップ手段と、第２トリップ信号により第２遮断
器をトリップする第２トリップ手段と、トリップ検出手
段の検出出力により母線連絡遮断器をトリップする第３
トリップ手段とを備えている電力系統保護装置を構成し
たものである。As a sixth device, a first breaker inserted in a first bus connecting the first transformer connected to the first AC power supply and the first load, and a second AC power supply are connected. A second circuit breaker inserted in a second bus connecting the second transformer and the second load, and a second circuit breaker inserted in a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. Bus breaker, first ground fault detecting means for detecting a ground fault from a zero-phase current generated in the first bus, and second ground fault detecting for detecting a ground fault from a zero-phase current generated in the second bus Means, third ground fault detecting means for detecting a ground fault from a zero-phase current generated in one of the first bus and the second bus, and trip detection for detecting that the bus communication circuit breaker has tripped Means, and a first activation signal provided on condition of a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means. A first activation signal generating means for outputting,
A second start signal generating means for outputting a second start signal on condition of a logical product of a detection output of the second ground fault detection means and a detection output of the third ground fault detection means, and inputting the first start signal for a predetermined time or more A first timer that outputs a first timer signal when the
A second timer for outputting a second timer signal when a start signal is inputted for a predetermined time or more, and a first trip for outputting a first trip signal on condition of a logical product of the first timer signal and a detection output of the trip detecting means. Signal generating means, second trip signal generating means for outputting a second trip signal on condition of the logical product of the second timer signal and the detection output of the trip detecting means, and tripping the first breaker by the first trip signal. A first trip means, a second trip means for tripping the second circuit breaker according to the second trip signal, and a third means for tripping the bus connection circuit breaker according to the detection output of the trip detection means.
And a power system protection device including a trip means.
【００１２】第７の装置として、第１交流電源と第１負
荷とを結ぶ第１母線中に挿入された第１遮断器と、第２
交流電源と第２負荷とを結ぶ第２母線中に挿入された第
２遮断器と、第１遮断器の出力側と第２遮断器の出力側
とを結ぶ母線連絡線中に挿入された母線連絡遮断器と、
第１母線に短絡事故が発生したことを検出する第１短絡
事故検出手段と、第２母線に短絡事故が発生したことを
検出する第２短絡事故検出手段と、第１母線と第２母線
のうちいずれか一方の母線に短絡事故が発生したことを
検出する第３短絡事故検出手段と、母線連絡遮断器がト
リップしたことを検出するトリップ検出手段と、第１地
絡検出手段の検出出力と第３地絡検出手段の検出出力と
の論理積を条件に第１起動信号を出力する第１起動信号
発生手段と、第２地絡検出手段の検出出力と第３地絡検
出手段の検出出力との論理積を条件に第２起動信号を出
力する第２起動信号発生手段と、第１起動信号を一定時
間以上入力したときに第１タイマ信号を出力する第１タ
イマと、第２起動信号を一定時間以上入力したときに第
２タイマ信号を出力する第２タイマと、第１タイマ信号
とトリップ検出手段の検出出力との論理積を条件に第１
トリップ信号を出力する第１トリップ信号発生手段と、
第２タイマ信号とトリップ検出手段の検出出力との論理
積を条件に第２トリップ信号を出力する第２トリップ信
号発生手段と、第１トリップ信号により第１遮断器をト
リップする第１トリップ手段と、第２トリップ信号によ
り第２遮断器をトリップする第２トリップ手段と、トリ
ップ検出手段の検出出力により母線連絡遮断器をトリッ
プする第３トリップ手段とを備えている電力系統保護装
置を構成したものである。A seventh device includes a first breaker inserted in a first bus connecting the first AC power supply and the first load, and a second breaker inserted in a first bus.
A second circuit breaker inserted in a second bus connecting the AC power supply and the second load, and a bus inserted in a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. Communication breaker,
A first short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the first bus, a second short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the second bus, and a first bus and a second bus. A third short-circuit fault detecting means for detecting that a short-circuit fault has occurred in one of the buses, a trip detecting means for detecting that the bus-barrier circuit breaker has tripped, and a detection output of the first ground fault detecting means. First activation signal generating means for outputting a first activation signal on condition of a logical product of the detection output of the third ground fault detecting means, a detection output of the second ground fault detecting means and a detection output of the third ground fault detecting means A second activation signal generating means for outputting a second activation signal on condition of a logical product of the first and second activation signals, a first timer for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more, and a second activation signal The second timer signal is output when A second timer, the on condition of the logical product of the detection output of the first timer signal and the trip detection means 1
First trip signal generating means for outputting a trip signal;
A second trip signal generating means for outputting a second trip signal on condition of a logical product of the second timer signal and a detection output of the trip detecting means, and a first trip means for tripping the first circuit breaker by the first trip signal. And a second trip means for tripping the second circuit breaker in response to the second trip signal, and a third trip means for tripping the bus connection circuit breaker in accordance with the detection output of the trip detecting means. It is.
【００１３】第８の装置として、交流電源に接続された
変圧器と第１負荷とを結ぶ第１母線中に挿入された第１
遮断器と、発電機と第２負荷とを結ぶ第２母線中に挿入
された第２遮断器と、第１遮断器の出力側と第２遮断器
の出力側とを結ぶ母線連絡線中に挿入された母線連絡遮
断器と、第１母線に短絡事故が発生したことを検出する
第１短絡事故検出手段と、第２母線に短絡事故が発生し
たことを検出する第２短絡事故検出手段と、第１母線と
第２母線のうちいずれか一方の母線に短絡事故が発生し
たことを検出する第３短絡事故検出手段と、母線連絡遮
断器がトリップしたことを検出するトリップ検出手段
と、第１地絡検出手段の検出出力と第３地絡検出手段の
検出出力との論理積を条件に第１起動信号を出力する第
１起動信号発生手段と、第２地絡検出手段の検出出力と
第３地絡検出手段の検出出力との論理積を条件に第２起
動信号を出力する第２起動信号発生手段と、第１起動信
号を一定時間以上入力したときに第１タイマ信号を出力
する第１タイマと、第２起動信号を一定時間以上入力し
たときに第２タイマ信号を出力する第２タイマと、第１
タイマ信号とトリップ検出手段の検出出力との論理積を
条件に第１トリップ信号を出力する第１トリップ信号発
生手段と、第２タイマ信号とトリップ検出手段の検出出
力との論理積を条件に第２トリップ信号を出力する第２
トリップ信号発生手段と、第１トリップ信号により第１
遮断器をトリップする第１トリップ手段と、第２トリッ
プ信号により第２遮断器をトリップする第２トリップ手
段と、トリップ検出手段の検出出力により母線連絡遮断
器をトリップする第３トリップ手段とを備えている電力
系統保護装置を構成したものである。As an eighth device, a first bus inserted between a transformer connected to an AC power supply and a first load is connected to a first bus.
A circuit breaker, a second circuit breaker inserted into a second bus connecting the generator and the second load, and a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. An inserted busbar circuit breaker, first short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the first bus, and second short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the second bus bar. A third short-circuit fault detecting means for detecting that a short-circuit fault has occurred in any one of the first bus and the second bus, a trip detecting means for detecting that the bus communication circuit breaker has tripped, A first start signal generating means for outputting a first start signal on condition of a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means, and a detection output of the second ground fault detecting means. A second start signal is output on condition of a logical product with a detection output of the third ground fault detecting means. Start signal generating means, a first timer that outputs a first timer signal when a first start signal is input for a predetermined time or more, and a second timer that outputs a second timer signal when a second start signal is input for a certain time or more Two timers and the first
A first trip signal generating means for outputting a first trip signal on condition of a logical product of a timer signal and a detection output of the trip detecting means, and a second signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means. The second that outputs a two-trip signal
A first trip signal generated by a first trip signal;
A first trip means for tripping the circuit breaker, a second trip means for tripping the second circuit breaker in response to the second trip signal, and a third trip means for tripping the busbar circuit breaker in response to a detection output of the trip detecting means. Power system protection device.
【００１４】第９の装置として、第１交流電源に接続さ
れた第１変圧器と第１負荷とを結ぶ第１母線中に挿入さ
れた第１遮断器と、第２交流電源に接続された第２変圧
器と第２負荷とを結ぶ第２母線中に挿入された第２遮断
器と、第１遮断器の出力側と第２遮断器の出力側とを結
ぶ母線連絡線中に挿入された母線連絡遮断器と、第１母
線に短絡事故が発生したことを検出する第１短絡事故検
出手段と、第２母線に短絡事故が発生したことを検出す
る第２短絡事故検出手段と、第１母線と第２母線のうち
いずれか一方の母線に短絡事故が発生したことを検出す
る第３短絡事故検出手段と、母線連絡遮断器がトリップ
したことを検出するトリップ検出手段と、第１地絡検出
手段の検出出力と第３地絡検出手段の検出出力との論理
積を条件に第１起動信号を出力する第１起動信号発生手
段と、第２地絡検出手段の検出出力と第３地絡検出手段
の検出出力との論理積を条件に第２起動信号を出力する
第２起動信号発生手段と、第１起動信号を一定時間以上
入力したときに第１タイマ信号を出力する第１タイマ
と、第２起動信号を一定時間以上入力したときに第２タ
イマ信号を出力する第２タイマと、第１タイマ信号とト
リップ検出手段の検出出力との論理積を条件に第１トリ
ップ信号を出力する第１トリップ信号発生手段と、第２
タイマ信号とトリップ検出手段の検出出力との論理積を
条件に第２トリップ信号を出力する第２トリップ信号発
生手段と、第１トリップ信号により第１遮断器をトリッ
プする第１トリップ手段と、第２トリップ信号により第
２遮断器をトリップする第２トリップ手段と、トリップ
検出手段の検出出力により母線連絡遮断器をトリップす
る第３トリップ手段とを備えている電力系統保護装置を
構成したものである。As a ninth device, a first circuit breaker inserted in a first bus connecting the first transformer connected to the first AC power supply and the first load, and a second AC power supply are connected. A second circuit breaker inserted in a second bus connecting the second transformer and the second load, and a second circuit breaker inserted in a bus connecting line connecting an output side of the first circuit breaker and an output side of the second circuit breaker. A short circuit accident detecting means for detecting that a short circuit accident has occurred in the first bus, a second short circuit accident detecting means for detecting that a short circuit accident has occurred in the second bus, A third short-circuit accident detecting means for detecting that a short-circuit accident has occurred in one of the first bus and the second bus, a trip detecting means for detecting that the bus communication circuit breaker has tripped, and a first ground. The first triggering is performed on condition that a logical product of the detection output of the ground fault detecting means and the detection output of the third ground fault detecting means is provided. A first start signal generating means for outputting a signal, and a second start signal generating means for outputting a second start signal on condition of a logical product of a detection output of the second ground fault detecting means and a detection output of the third ground fault detecting means. Means, a first timer that outputs a first timer signal when a first start signal is input for a fixed time or more, and a second timer that outputs a second timer signal when a second start signal is input for a certain time or more. A first trip signal generating means for outputting a first trip signal on condition of a logical product of a first timer signal and a detection output of the trip detecting means;
A second trip signal generating means for outputting a second trip signal on condition of a logical product of the timer signal and a detection output of the trip detecting means; a first trip means for tripping the first breaker by the first trip signal; The power system protection apparatus comprises a second trip means for tripping the second circuit breaker in response to a two trip signal, and a third trip means for tripping the bus connection circuit breaker in response to a detection output of the trip detecting means. .
【００１５】[0015]
【作用】このように構成されることから、本発明によれ
ば、次の作用により上記目的が達成される。すなわち、
各母線が母線連絡遮断器を介して接続されているとき
に、一方の母線で地絡事故が生じると、各母線に地絡に
伴う地絡電流が流れ、第１，第２，第３地絡検出手段か
らそれぞれ地絡検出信号が出力される。これにより第１
起動信号と第２起動信号が同時に出力され第１タイマ及
び第２タイマが共に起動される。各タイマが起動したあ
と第３地絡検出手段の検出出力によって母線連絡遮断器
がトリップされる。このため、地絡事故が発生しない母
線に設けられた地絡検出手段は検出出力の発生が停止さ
れる。例えば、第１母線で地絡事故が発生したときには
第２地絡検出手段の検出出力の発生が停止されると共
に、第２起動信号の発生が停止され、第２タイマの起動
が停止されることになる。一方、第１タイマの起動は継
続され、第１起動信号の発生が一定時間継続されて第１
タイマから第１タイマ信号が出力されると共に、トリッ
プ検出手段によって母線連絡遮断器がトリップしたこと
が検出されると、第１トリップ信号発生手段から第１ト
リップ信号が出力され、第１母線側の第１遮断器がトリ
ップされる。すなわち地絡事故の生じた母線の第１遮断
器のみがトリップされることになる。また第２母線で地
絡事故が生じたときには、母線連絡遮断器が開かれると
共に第１遮断器をトリップするための第２起動信号の発
生が停止されるため、第２母線の遮断器のみがトリップ
されることになる。また各母線で短絡事故が生じたとき
にも、同様な作用によって一方の遮断器のみをトリップ
させることができる。According to the present invention, the above-mentioned object is achieved by the following operation. That is,
If a ground fault occurs in one of the buses when each bus is connected via the bus communication circuit breaker, a ground fault current due to the ground fault flows through each bus, and the first, second, and third grounds are caused. A ground fault detection signal is output from each of the ground fault detection means. This makes the first
The start signal and the second start signal are output simultaneously, and both the first timer and the second timer are started. After the start of each timer, the bus breaker is tripped by the detection output of the third ground fault detecting means. For this reason, the generation of the detection output is stopped for the ground fault detecting means provided on the bus where no ground fault occurs. For example, when a ground fault occurs on the first bus, the detection output of the second ground fault detecting means is stopped, the generation of the second start signal is stopped, and the start of the second timer is stopped. become. On the other hand, the activation of the first timer is continued, and the generation of the first activation signal is continued for a certain period of time.
When the first timer signal is output from the timer and the trip detecting means detects that the bus communication breaker has tripped, the first trip signal is output from the first trip signal generating means, and the first bus signal on the first bus side is output. The first circuit breaker is tripped. That is, only the first circuit breaker of the bus in which the ground fault has occurred is tripped. When a ground fault occurs in the second bus, the bus communication circuit breaker is opened and the generation of the second start signal for tripping the first circuit breaker is stopped. You will be tripped. Also, when a short circuit accident occurs in each bus bar, only one of the circuit breakers can be tripped by the same operation.
【００１６】[0016]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。図１において、Δ−Ｙ接続された変圧器１０の
一次側は、第１交流電源を構成する変電所に接続され、
二次側は第１母線１２に接続されている。第１母線１２
中には第１遮断器１４が挿入されており、遮断器１４は
第１母線１２を介して第１負荷１６に接続されている。
一方発電機１８は第２交流電源として設けられており、
この発電機１８の出力側には第２母線２０が接続されて
いる。そして第２母線２０中には第２遮断器２２が挿入
されており、遮断器２２は第２母線２０を介して第２負
荷２４に接続されている。遮断器１４の出力側と遮断器
２２の出力側には母線連絡線２６が配線されており、こ
の母線連絡線２６中には母線連絡遮断器２８が挿入され
ている。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the primary side of the transformer 10 connected in Δ-Y is connected to a substation constituting a first AC power supply,
The secondary side is connected to the first bus 12. First bus 12
A first circuit breaker 14 is inserted therein, and the circuit breaker 14 is connected to the first load 16 via the first bus 12.
On the other hand, the generator 18 is provided as a second AC power supply,
A second bus 20 is connected to the output side of the generator 18. A second circuit breaker 22 is inserted into the second bus 20, and the circuit breaker 22 is connected to the second load 24 via the second bus 20. A bus connecting line 26 is connected to the output side of the circuit breaker 14 and the output side of the circuit breaker 22, and a bus connecting circuit breaker 28 is inserted into the bus connecting line 26.
【００１７】変圧器１０と発電機１８にはそれぞれ中性
線３０，３２が設けられており、各中性線３０，３２が
中性線３４を介して接地されている。そして中性線３０
には変流器３６が、中性線３２には変流器３８が、中性
線３４には変流器４０がそれぞれ設けられている。変流
器３６の出力側は地絡保護リレー４２に接続され、変流
器３８の出力側は地絡保護リレー４４に接続され、変流
器４０の出力側は地絡保護リレー４６にそれぞれ接続さ
れている。The transformer 10 and the generator 18 are provided with neutral wires 30 and 32, respectively, and the neutral wires 30 and 32 are grounded via a neutral wire 34. And neutral wire 30
, A current transformer 38 is provided on the neutral conductor 32, and a current transformer 40 is provided on the neutral conductor 34. The output side of the current transformer 36 is connected to the ground fault protection relay 42, the output side of the current transformer 38 is connected to the ground fault protection relay 44, and the output side of the current transformer 40 is connected to the ground fault protection relay 46, respectively. Have been.
【００１８】地絡保護リレー４２は、図２に示されるよ
うに検出部４２Ａとトリップ駆動部４２Ｂを備え、地絡
保護リレー４４は検出部４４Ａ、トリップ駆動部４４Ｂ
を備え、地絡保護リレー４６は検出部４６Ａ、トリップ
駆動部４６Ｂを備えて構成されており、各検出部４２
Ａ，４４Ａ，４６Ｂと各トリップ駆動部４２Ｂ，４４
Ｂ，４６Ｂとの間に論理回路４８が設けられている。検
出部４２Ａは変流器３６によって中性線３６に流れる零
相電流が設定レベルを超えたときにトリップ検出信号を
発生するようになっており、検出部４４Ａは変流器３８
によって中性線３２に流れる零相電流が設定レベルを超
えたときに地絡検出信号を出力するようになっている。
また検出部４６Ａは変流器４０によって中性線３４に流
れる零相電流が設定レベルを超えたときに地絡検出信号
を出力するようになっている。すなわち、変流器３６、
検出部４２Ａは第１地絡検出手段を、変流器３８と検出
部４４Ａは第２地絡検出手段を、変流器４０と検出部４
６Ａは第３地絡検出手段を構成するようになっている。As shown in FIG. 2, the ground fault protection relay 42 includes a detection unit 42A and a trip drive unit 42B. The ground fault protection relay 44 includes a detection unit 44A and a trip drive unit 44B.
The ground fault protection relay 46 includes a detecting unit 46A and a trip driving unit 46B.
A, 44A, 46B and each trip drive section 42B, 44
A logic circuit 48 is provided between B and 46B. The detecting section 42A generates a trip detection signal when the zero-phase current flowing through the neutral conductor 36 by the current transformer 36 exceeds a set level, and the detecting section 44A detects the current transformer 38
Thus, when the zero-phase current flowing through the neutral line 32 exceeds a set level, a ground fault detection signal is output.
The detection unit 46A outputs a ground fault detection signal when the zero-phase current flowing through the neutral conductor 34 by the current transformer 40 exceeds a set level. That is, the current transformer 36,
The detecting unit 42A includes a first ground fault detecting unit, the current transformer 38 and the detecting unit 44A include a second ground fault detecting unit, and the current transformer 40 and the detecting unit 4
6A constitutes a third ground fault detecting means.
【００１９】論理回路４８はＡＮＤゲート５０、第１タ
イマ５２、ＡＮＤゲート５４、ＡＮＤゲート５６、第２
タイマ５８、ＡＮＤゲート６０を備えて構成されてい
る。ＡＮＤゲート５０は検出部４６Ａと検出部４２Ａの
検出出力の論理積を条件に第１起動信号を発生する第１
起動信号発生手段として構成されている。第１タイマ５
２は第１起動信号の入力が一定時間継続されたときに第
１タイマ信号を発生するようになっている。一方ＡＮＤ
ゲート５６は検出部４６Ａと検出部４４Ａの検出信号の
論理積を条件に第２起動信号を発生する第２起動発生手
段として構成されている。第２タイマ５８は第２起動信
号の入力が一定時間以上継続されたときに第２タイマ信
号を発生するようになっている。ＡＮＤゲート５４は第
１タイマ５２からの第１タイマ信号と母線連絡遮断器２
８がトリップされたことを検出するトリップ検出器６２
の検出出力との論理積を条件に、第１トリップ信号を発
生する第１トリップ信号発生手段として構成されてい
る。またＡＮＤゲート６０は第２タイマ信号とトリップ
検出器６２の検出信号との論理積を条件に第２トリップ
信号を発生する第２トリップ信号発生手段を構成するよ
うになっている。そして第１トリップ信号はトリップ駆
動部４２Ｂに入力され、第２トリップ信号はトリップ駆
動部４４Ｂに入力される。トリップ駆動部４２Ｂは第１
トリップ信号によって第１遮断器１４をトリップする第
１トリップ手段として構成されており、トリップ駆動部
４４Ｂは第２トリップ信号により第２遮断器２２をトリ
ップする第２トリップ手段として構成されている。更に
トリップ駆動部４６Ｂは検出部４６Ａの検出出力に応答
として母線連絡遮断器２８をトリップする第３トリップ
手段として構成されている。なお、第１タイマ５２及び
第２タイマ５８のタイマ時間は各検出部４２Ａ，４４
Ａ，４６Ａから検出信号が発生したあとトリップ検出器
６２から検出信号が発生される時間以上に設定されてい
る。The logic circuit 48 includes an AND gate 50, a first timer 52, an AND gate 54, an AND gate 56, a second
A timer 58 and an AND gate 60 are provided. The AND gate 50 generates a first start signal based on a logical product of the detection outputs of the detection unit 46A and the detection unit 42A.
It is configured as start signal generating means. First timer 5
Numeral 2 generates a first timer signal when the input of the first activation signal is continued for a predetermined time. While AND
The gate 56 is configured as a second activation generation unit that generates a second activation signal on condition of a logical product of the detection signals of the detection unit 46A and the detection unit 44A. The second timer 58 generates a second timer signal when the input of the second start signal is continued for a predetermined time or more. The AND gate 54 is connected to the first timer signal from the first timer 52 and the bus communication circuit breaker 2.
8 is a trip detector 62 for detecting that a trip has occurred.
Is configured as first trip signal generating means for generating a first trip signal on condition of a logical product with the detection output of the first trip signal. The AND gate 60 constitutes a second trip signal generating means for generating a second trip signal on condition of a logical product of the second timer signal and the detection signal of the trip detector 62. Then, the first trip signal is input to the trip driver 42B, and the second trip signal is input to the trip driver 44B. The trip drive unit 42B is the first
The trip drive unit 44B is configured as a second trip unit that trips the second circuit breaker 22 according to the second trip signal. Further, the trip drive unit 46B is configured as a third trip unit that trips the busbar circuit breaker 28 in response to the detection output of the detection unit 46A. Note that the timer times of the first timer 52 and the second timer 58 are determined by the detection units 42A, 44A.
The time is set to be equal to or longer than the time when the detection signal is generated from the trip detector 62 after the detection signal is generated from A and 46A.
【００２０】次に本発明に係る実施例の作用を図３のタ
イムチャートに従って説明する。遮断器１４，２２，２
６が共に閉じた状態にあって各負荷１６，２４に電力が
供給されているときに、第１負荷１６の系統で地絡事故
が生じると、各中性線３０，３２，３４に地絡事故に伴
う地絡電流が流れる。そしてこの地絡電流が各変流器３
６，３８，４０によって検出されると各検出部４２Ａ，
４４Ａ，４６Ａからそれぞれ検出信号が出力される。こ
れによりＡＮＤゲート５０からは第１起動信号が出力さ
れ、ＡＮＤゲート５６からは第２起動信号が出力され
る。そして第１タイマ５２と第２タイマ５８が同時に起
動される。第１タイマ５２及び第２タイマ５８によって
各起動信号の計時が行なわれているときに、検出部４６
Ａからの検出信号がトリップ駆動部４６Ｂに入力され母
線連絡遮断器２８がトリップされる。これにより中性線
３２に流れる地絡電流が零となり、検出部４４Ａの出力
信号のレベルがハイレベルからローレベルに反転する。
この結果第２起動信号の出力が停止されると共に第２タ
イマ５８の起動が停止される。Next, the operation of the embodiment according to the present invention will be described with reference to the time chart of FIG. Circuit breakers 14, 22, 2
If the ground fault occurs in the system of the first load 16 while the power is supplied to each of the loads 16 and 24 in a state where both are closed, a ground fault occurs in each of the neutral wires 30, 32 and 34. Ground fault current flows due to the accident. And this ground fault current is applied to each current transformer 3
6, 38, and 40, each detection unit 42A,
Detection signals are output from 44A and 46A, respectively. As a result, the first activation signal is output from the AND gate 50, and the second activation signal is output from the AND gate 56. Then, the first timer 52 and the second timer 58 are started simultaneously. When the first timer 52 and the second timer 58 are timing each activation signal, the detection unit 46
The detection signal from A is input to the trip drive unit 46B, and the bus communication circuit breaker 28 is tripped. As a result, the ground fault current flowing through the neutral line 32 becomes zero, and the level of the output signal of the detection unit 44A is inverted from the high level to the low level.
As a result, the output of the second start signal is stopped, and the start of the second timer 58 is stopped.
【００２１】一方、ＡＮＤゲート５０の出力はハイレベ
ルの状態に維持されており、第１タイマ５２の計時は継
続されている。そして第１タイマ５２によって、第１起
動信号の入力が一定時間以上継続したことが計時される
と、第１タイマ５２から第１タイマ信号が出力される。
このとき、母線連絡遮断器２８は既にトリップされてい
るので、トリップ検出器６２からはハイレベルの信号が
出力され、ＡＮＤゲート５４からは第１トリップ信号が
出力される。これによりトリップ駆動部４２Ｂによって
第１遮断器１４がトリップされることになる。On the other hand, the output of the AND gate 50 is maintained at a high level, and the time counting by the first timer 52 is continued. When the first timer 52 measures that the input of the first activation signal has continued for a certain period of time or more, the first timer 52 outputs a first timer signal.
At this time, since the bus communication circuit breaker 28 has already been tripped, the trip detector 62 outputs a high-level signal, and the AND gate 54 outputs the first trip signal. As a result, the first breaker 14 is tripped by the trip drive unit 42B.
【００２２】このように、本実施例によれば、第１母線
１２の系統で地絡事故が生じたときには、母線連絡遮断
器２８をトリップしたあと第１遮断器１４をトリップさ
せるようにしたため、地絡事故の生じた系統のみを電源
から遮断することができ、健全な系統には継続して電力
を供給することができ、停電範囲を第１負荷１６のみに
限定することができる。このため第１母線１２と第２母
線２０とが母線連絡遮断器２８を介して接続されている
系統でも地絡事故に伴う停電範囲を極小化することがで
きる。As described above, according to the present embodiment, when a ground fault occurs in the system of the first bus 12, the first circuit breaker 14 is tripped after the bus communication circuit breaker 28 is tripped. Only the system in which the ground fault has occurred can be cut off from the power supply, the healthy system can be continuously supplied with power, and the power failure range can be limited to only the first load 16. Therefore, even in a system in which the first bus 12 and the second bus 20 are connected via the bus connection circuit breaker 28, the power failure range due to the ground fault can be minimized.
【００２３】また、前記実施例において、第２母線の負
荷側の系統で地絡事故が生じたときには、母線連絡遮断
器２８がトリップされたあと第２遮断器２２がトリップ
され、第１遮断器１４が閉じた状態に保持されるため、
停電範囲を第２負荷２４のみに限定することができる。In the above embodiment, when a ground fault occurs in the system on the load side of the second bus, the bus breaker 28 is tripped, then the second breaker 22 is tripped, and the first breaker is tripped. Because 14 is kept closed,
The power failure range can be limited to only the second load 24.
【００２４】また前記実施例においては、第２母線を発
電機１８に接続したものについて述べたが、図４に示さ
れるように、第２母線２０をΔ−Ｙ接続された変圧器６
４に接続し、変圧器６４を変電所などに接続した電力系
統においても、前記実施例と同様に地絡事故に伴う停電
範囲の極小化を計ることができる。In the above embodiment, the second bus was connected to the generator 18, but as shown in FIG. 4, the second bus 20 was connected to the transformer 6 connected by Δ-Y.
4 as well as in the power system in which the transformer 64 is connected to a substation or the like, it is possible to minimize the power failure range due to a ground fault as in the above embodiment.
【００２５】また前記実施例においては、電力系統で地
絡事故が発生したときに、この地絡事故から系統を保護
することについて述べたが、各電力系統に短絡事故を検
出する短絡事故検出器を設け、この検出器の出力信号を
論理回路４８に接続する構成としても、前記実施例と同
様に、短絡事故から系統を保護することができると共
に、短絡事故から停電となる範囲を一定の範囲に限定す
ることができる。In the above embodiment, when a ground fault has occurred in a power system, the system has been described as being protected from the ground fault. However, a short-circuit fault detector for detecting a short-circuit fault in each power system has been described. Is provided, the output signal of the detector is connected to the logic circuit 48, as in the above embodiment, the system can be protected from a short-circuit accident, and the range from a short-circuit accident to a power outage can be set within a certain range. Can be limited to
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
複数の母線を母線連絡遮断器を介して接続した電力系統
において、一方の母線で事故が発生したときに、母線連
絡遮断器をトリップさせたあと、事故の生じた系統の遮
断器のみをトリップさせるようにしたため、停電範囲を
事故の生じた系統のみに限定することができ、停電範囲
の極小化に寄与することができる。As described above, according to the present invention,
In an electric power system in which a plurality of buses are connected via a bus communication circuit breaker, when an accident occurs in one bus, the bus communication circuit breaker is tripped, and then only the circuit breaker in the system where the accident occurred is tripped As a result, the power outage range can be limited to only the system in which the accident has occurred, which can contribute to minimizing the power outage range.
【図１】本発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing one embodiment of the present invention.
【図２】論理回路の具体的構成図である。FIG. 2 is a specific configuration diagram of a logic circuit.
【図３】図１及び図２に示す装置の作用を説明するため
のタイムチャートである。FIG. 3 is a time chart for explaining the operation of the device shown in FIGS. 1 and 2;
【図４】本発明の他の実施例を示す要部構成図である。FIG. 4 is a main part configuration diagram showing another embodiment of the present invention.
１０ 変圧器 １２ 第１母線 １４ 第１遮断器 １６ 第１負荷 １８ 発電機 ２０ 第２母線 ２２ 第２遮断器 ２４ 第２負荷 ２８ 母線連絡遮断器 ３０，３２，３４ 中性線 ３６，３８，４０ 変流器 ４２，４４，４６ 地絡保護リレー ４８ 論理回路 ６２ トリップ検出器 DESCRIPTION OF SYMBOLS 10 Transformer 12 1st bus 14 1st circuit breaker 16 1st load 18 Generator 20 2nd bus 22 Second circuit breaker 24 2nd load 28 Busbar connection circuit breaker 30,32,34 Neutral wire 36,38,40 Current transformers 42, 44, 46 Ground fault protection relay 48 Logic circuit 62 Trip detector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松島 美保 茨城県日立市国分町１丁目１番１号 株 式会社 日立製作所 国分工場内 (56)参考文献 特開 昭54−15147（ＪＰ，Ａ) 実開 昭58−145040（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 7/22 H02H 7/26 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Miho Matsushima 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Kokubu Plant (56) References JP-A-54-15147 (JP, A) 58-145040 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H02H 7/22 H02H 7/26
Claims (9)
線中に挿入された第１遮断器と、第２交流電源と第２負
荷とを結ぶ第２母線中に挿入された第２遮断器と、第１
遮断器の出力側と第２遮断器の出力側とを結ぶ母線連絡
線中に挿入された母線連絡遮断器と、第１母線に地絡に
伴う電気信号が発生したことを検出する第１地絡検出手
段と、第２母線に地絡に伴う電気信号が発生したことを
検出する第２地絡検出手段と、第１母線と第２母線のう
ちいずれか一方の母線に地絡に伴う電気信号が発生した
ことを検出する第３地絡検出手段と、母線連絡遮断器が
トリップしたことを検出するトリップ検出手段と、第１
地絡検出手段の検出出力と第３地絡検出手段の検出出力
との論理積を条件に第１起動信号を出力する第１起動信
号発生手段と、第２地絡検出手段の検出出力と第３地絡
検出手段の検出出力との論理積を条件に第２起動信号を
出力する第２起動信号発生手段と、第１起動信号を一定
時間以上入力したときに第１タイマ信号を出力する第１
タイマと、第２起動信号を一定時間以上入力したときに
第２タイマ信号を出力する第２タイマと、第１タイマ信
号とトリップ検出手段の検出出力との論理積を条件に第
１トリップ信号を出力する第１トリップ信号発生手段
と、第２タイマ信号とトリップ検出手段の検出出力との
論理積を条件に第２トリップ信号を出力する第２トリッ
プ信号発生手段と、第１トリップ信号により第１遮断器
をトリップする第１トリップ手段と、第２トリップ信号
により第２遮断器をトリップする第２トリップ手段と、
トリップ検出手段の検出出力により母線連絡遮断器をト
リップする第３トリップ手段とを備えている電力系統保
護装置。1. A first circuit breaker inserted in a first bus connecting a first AC power supply and a first load, and a first circuit breaker inserted in a second bus connecting a second AC power supply and a second load. 2 circuit breakers and 1st
A bus communication circuit breaker inserted into a bus communication line connecting the output side of the circuit breaker and the output side of the second circuit breaker, and a first ground for detecting that an electric signal due to a ground fault is generated in the first bus. A ground fault detecting means, a second ground fault detecting means for detecting that an electric signal associated with a ground fault is generated in the second bus, and an electric power associated with the ground fault in one of the first bus and the second bus. Third ground fault detecting means for detecting that a signal has been generated, trip detecting means for detecting that the bus communication circuit breaker has tripped,
A first start signal generating means for outputting a first start signal on condition of a logical product of a detection output of the ground fault detecting means and a detection output of the third ground fault detecting means; A second activation signal generating means for outputting a second activation signal on condition of a logical product of the detection output of the three ground fault detecting means, and a second timer signal for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more. 1
A timer, a second timer for outputting a second timer signal when the second start signal is input for a predetermined time or more, and a first trip signal on the condition of a logical product of the first timer signal and a detection output of the trip detecting means. A first trip signal generating means for outputting, a second trip signal generating means for outputting a second trip signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means, and a first trip signal based on the first trip signal. First trip means for tripping the circuit breaker, second trip means for tripping the second circuit breaker according to the second trip signal,
A power system protection device comprising: a third trip unit that trips the busbar circuit breaker based on a detection output of the trip detection unit.
とを結ぶ第１母線中に挿入された第１遮断器と、発電機
と第２負荷とを結ぶ第２母線中に挿入された第２遮断器
と、第１遮断器の出力側と第２遮断器の出力側とを結ぶ
母線連絡線中に挿入された母線連絡遮断器と、第１母線
に地絡に伴う電気信号が発生したことを検出する第１地
絡検出手段と、第２母線に地絡に伴う電気信号が発生し
たことを検出する第２地絡検出手段と、第１母線と第２
母線のうちいずれか一方の母線に地絡に伴う電気信号が
発生したことを検出する第３地絡検出手段と、母線連絡
遮断器がトリップしたことを検出するトリップ検出手段
と、第１地絡検出手段の検出出力と第３地絡検出手段の
検出出力との論理積を条件に第１起動信号を出力する第
１起動信号発生手段と、第２地絡検出手段の検出出力と
第３地絡検出手段の検出出力との論理積を条件に第２起
動信号を出力する第２起動信号発生手段と、第１起動信
号を一定時間以上入力したときに第１タイマ信号を出力
する第１タイマと、第２起動信号を一定時間以上入力し
たときに第２タイマ信号を出力する第２タイマと、第１
タイマ信号とトリップ検出手段の検出出力との論理積を
条件に第１トリップ信号を出力する第１トリップ信号発
生手段と、第２タイマ信号とトリップ検出手段の検出出
力との論理積を条件に第２トリップ信号を出力する第２
トリップ信号発生手段と、第１トリップ信号により第１
遮断器をトリップする第１トリップ手段と、第２トリッ
プ信号により第２遮断器をトリップする第２トリップ手
段と、トリップ検出手段の検出出力により母線連絡遮断
器をトリップする第３トリップ手段とを備えている電力
系統保護装置。2. A first circuit breaker inserted in a first bus connecting a transformer connected to an AC power supply and a first load, and a first circuit breaker inserted in a second bus connecting a generator and a second load. A second circuit breaker, a bus connection breaker inserted into a bus connection line connecting the output side of the first circuit breaker and the output side of the second circuit breaker, and an electric signal associated with a ground fault in the first bus. A first ground fault detecting means for detecting occurrence of the ground fault, a second ground fault detecting means for detecting occurrence of an electric signal associated with the ground fault on the second bus,
Third ground fault detecting means for detecting that an electric signal associated with a ground fault has occurred in one of the buses, trip detecting means for detecting that the bus communication circuit breaker has tripped, and first ground fault First activation signal generation means for outputting a first activation signal on condition of a logical product of a detection output of the detection means and a detection output of the third ground fault detection means, a detection output of the second ground fault detection means and a third ground A second activation signal generating means for outputting a second activation signal on condition of a logical product of the detection output of the short detection means and a first timer for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more A second timer that outputs a second timer signal when a second start signal is input for a predetermined time or more,
A first trip signal generating means for outputting a first trip signal on condition of a logical product of a timer signal and a detection output of the trip detecting means, and a second signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means. The second that outputs a two-trip signal
A first trip signal generated by a first trip signal;
A first trip means for tripping the circuit breaker, a second trip means for tripping the second circuit breaker in response to the second trip signal, and a third trip means for tripping the busbar circuit breaker in response to a detection output of the trip detecting means. Power system protection equipment.
第１負荷とを結ぶ第１母線中に挿入された第１遮断器
と、第２交流電源に接続された第２変圧器と第２負荷と
を結ぶ第２母線中に挿入された第２遮断器と、第１遮断
器の出力側と第２遮断器の出力側とを結ぶ母線連絡線中
に挿入された母線連絡遮断器と、第１母線に地絡に伴う
電気信号が発生したことを検出する第１地絡検出手段
と、第２母線に地絡に伴う電気信号が発生したことを検
出する第２地絡検出手段と、第１母線と第２母線のうち
いずれか一方の母線に地絡に伴う電気信号が発生したこ
とを検出する第３地絡検出手段と、母線連絡遮断器がト
リップしたことを検出するトリップ検出手段と、第１地
絡検出手段の検出出力と第３地絡検出手段の検出出力と
の論理積を条件に第１起動信号を出力する第１起動信号
発生手段と、第２地絡検出手段の検出出力と第３地絡検
出手段の検出出力との論理積を条件に第２起動信号を出
力する第２起動信号発生手段と、第１起動信号を一定時
間以上入力したときに第１タイマ信号を出力する第１タ
イマと、第２起動信号を一定時間以上入力したときに第
２タイマ信号を出力する第２タイマと、第１タイマ信号
とトリップ検出手段の検出出力との論理積を条件に第１
トリップ信号を出力する第１トリップ信号発生手段と、
第２タイマ信号とトリップ検出手段の検出出力との論理
積を条件に第２トリップ信号を出力する第２トリップ信
号発生手段と、第１トリップ信号により第１遮断器をト
リップする第１トリップ手段と、第２トリップ信号によ
り第２遮断器をトリップする第２トリップ手段と、トリ
ップ検出手段の検出出力により母線連絡遮断器をトリッ
プする第３トリップ手段とを備えている電力系統保護装
置。3. A first circuit breaker inserted in a first bus connecting the first load connected to the first AC power supply to the first load, and a second transformer connected to the second AC power supply. A second circuit breaker inserted in a second bus connecting the power supply and the second load, and a bus connection cut-off inserted in a bus connection connecting the output side of the first circuit breaker and the output side of the second circuit breaker Detector, first ground fault detecting means for detecting the occurrence of an electric signal associated with the ground fault in the first bus, and second ground fault detection detecting the occurrence of an electric signal associated with the ground fault in the second bus. Means, third ground fault detecting means for detecting that an electric signal associated with a ground fault has occurred in one of the first bus and the second bus, and detecting that the bus communication breaker has tripped. The first trigger is provided on condition that a logical product of the detection output of the first ground fault detecting means and the detection output of the third ground fault detecting means is provided. A second activation signal for outputting a second activation signal on condition of a logical product of a first output signal generation means for outputting a motion signal and a detection output of the second ground fault detection means and a detection output of the third ground fault detection means. Generating means, a first timer for outputting a first timer signal when a first start signal is input for a predetermined time or more, and a second timer for outputting a second timer signal when a second start signal is input for a certain time or more And a first logical value of the first timer signal and the detection output of the trip detecting means.
First trip signal generating means for outputting a trip signal;
A second trip signal generating means for outputting a second trip signal on condition of a logical product of the second timer signal and a detection output of the trip detecting means, and a first trip means for tripping the first circuit breaker by the first trip signal. And a second trip means for tripping the second circuit breaker in response to the second trip signal, and a third trip means for tripping the bus connection circuit breaker in response to a detection output of the trip detecting means.
線中に挿入された第１遮断器と、第２交流電源と第２負
荷とを結ぶ第２母線中に挿入された第２遮断器と、第１
遮断器の出力側と第２遮断器の出力側とを結ぶ母線連絡
線中に挿入された母線連絡遮断器と、第１母線に発生す
る零相電流から地絡を検出する第１地絡検出手段と、第
２母線に発生する零相電流から地絡を検出する第２地絡
検出手段と、第１母線と第２母線のうちいずれか一方の
母線に発生する零相電流から地絡を検出する第３地絡検
出手段と、母線連絡遮断器がトリップしたことを検出す
るトリップ検出手段と、第１地絡検出手段の検出出力と
第３地絡検出手段の検出出力との論理積を条件に第１起
動信号を出力する第１起動信号発生手段と、第２地絡検
出手段の検出出力と第３地絡検出手段の検出出力との論
理積を条件に第２起動信号を出力する第２起動信号発生
手段と、第１起動信号を一定時間以上入力したときに第
１タイマ信号を出力する第１タイマと、第２起動信号を
一定時間以上入力したときに第２タイマ信号を出力する
第２タイマと、第１タイマ信号とトリップ検出手段の検
出出力との論理積を条件に第１トリップ信号を出力する
第１トリップ信号発生手段と、第２タイマ信号とトリッ
プ検出手段の検出出力との論理積を条件に第２トリップ
信号を出力する第２トリップ信号発生手段と、第１トリ
ップ信号により第１遮断器をトリップする第１トリップ
手段と、第２トリップ信号により第２遮断器をトリップ
する第２トリップ手段と、トリップ検出手段の検出出力
により母線連絡遮断器をトリップする第３トリップ手段
とを備えている電力系統保護装置。4. A first circuit breaker inserted in a first bus connecting the first AC power supply and the first load, and a first circuit breaker inserted in a second bus connecting the second AC power supply and the second load. 2 circuit breakers and 1st
A first bus fault detecting a ground fault from a zero-phase current generated in the first bus, and a bus connection breaker inserted into a bus connecting line connecting the output side of the circuit breaker and the output side of the second breaker; Means, a second ground fault detecting means for detecting a ground fault from a zero-phase current generated in the second bus, and a ground fault from a zero-phase current generated in one of the first bus and the second bus. A third ground fault detecting means for detecting, a trip detecting means for detecting that the bus communication circuit breaker has tripped, and a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means. The first activation signal generating means for outputting the first activation signal under the condition, and the second activation signal is output under the condition of the logical product of the detection output of the second ground fault detection means and the detection output of the third ground fault detection means. A second start signal generating means for outputting a first timer signal when the first start signal is inputted for a predetermined time or more; A first timer, a second timer that outputs a second timer signal when a second start signal is input for a predetermined time or more, and a first timer that is AND-operated with the first timer signal and the detection output of the trip detection means. First trip signal generating means for outputting a trip signal, second trip signal generating means for outputting a second trip signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means, and a first trip signal A first trip means for tripping the first circuit breaker, a second trip means for tripping the second circuit breaker according to the second trip signal, and a third trip means for tripping the bus connection circuit breaker based on a detection output of the trip detecting means. A power system protection device comprising:
とを結ぶ第１母線中に挿入された第１遮断器と、発電機
と第２負荷とを結ぶ第２母線中に挿入された第２遮断器
と、第１遮断器の出力側と第２遮断器の出力側とを結ぶ
母線連絡線中に挿入された母線連絡遮断器と、第１母線
に発生する零相電流から地絡を検出する第１地絡検出手
段と、第２母線に発生する零相電流から地絡を検出する
第２地絡検出手段と、第１母線と第２母線のうちいずれ
か一方の母線に発生する零相電流から地絡を検出する第
３地絡検出手段と、母線連絡遮断器がトリップしたこと
を検出するトリップ検出手段と、第１地絡検出手段の検
出出力と第３地絡検出手段の検出出力との論理積を条件
に第１起動信号を出力する第１起動信号発生手段と、第
２地絡検出手段の検出出力と第３地絡検出手段の検出出
力との論理積を条件に第２起動信号を出力する第２起動
信号発生手段と、第１起動信号を一定時間以上入力した
ときに第１タイマ信号を出力する第１タイマと、第２起
動信号を一定時間以上入力したときに第２タイマ信号を
出力する第２タイマと、第１タイマ信号とトリップ検出
手段の検出出力との論理積を条件に第１トリップ信号を
出力する第１トリップ信号発生手段と、第２タイマ信号
とトリップ検出手段の検出出力との論理積を条件に第２
トリップ信号を出力する第２トリップ信号発生手段と、
第１トリップ信号により第１遮断器をトリップする第１
トリップ手段と、第２トリップ信号により第２遮断器を
トリップする第２トリップ手段と、トリップ検出手段の
検出出力により母線連絡遮断器をトリップする第３トリ
ップ手段とを備えている電力系統保護装置。5. A first circuit breaker inserted in a first bus connecting the transformer connected to the AC power supply and the first load, and a first circuit breaker inserted in a second bus connecting the generator and the second load. A second circuit breaker, a bus communication circuit breaker inserted into a bus communication line connecting the output side of the first circuit breaker and the output side of the second circuit breaker, and a ground circuit from zero-phase current generated in the first bus. A first ground fault detecting means for detecting a ground fault, a second ground fault detecting means for detecting a ground fault from a zero-sequence current generated in the second bus, and a bus connected to one of the first bus and the second bus. Third ground fault detecting means for detecting a ground fault from the generated zero-sequence current, trip detecting means for detecting that the bus communication circuit breaker has tripped, detection output of the first ground fault detecting means, and third ground fault detection A first start signal generating means for outputting a first start signal on condition of a logical product of the detection output of the first means and a second ground fault detecting means; A second start signal generating means for outputting a second start signal on condition of a logical product of the output and a detection output of the third ground fault detecting means; a first timer signal when the first start signal is inputted for a predetermined time or more; , A second timer that outputs a second timer signal when a second activation signal is input for a predetermined time or more, and a logical product of the first timer signal and the detection output of the trip detection means. The first trip signal generating means for outputting the first trip signal, and the second trip signal on the condition of the logical product of the second timer signal and the detection output of the trip detecting means.
Second trip signal generating means for outputting a trip signal;
The first tripping the first circuit breaker by the first trip signal
A power system protection device comprising: a trip unit; a second trip unit that trips a second circuit breaker according to a second trip signal; and a third trip unit that trips a bus connection circuit breaker according to a detection output of a trip detection unit.
第１負荷とを結ぶ第１母線中に挿入された第１遮断器
と、第２交流電源に接続された第２変圧器と第２負荷と
を結ぶ第２母線中に挿入された第２遮断器と、第１遮断
器の出力側と第２遮断器の出力側とを結ぶ母線連絡線中
に挿入された母線連絡遮断器と、第１母線に発生する零
相電流から地絡を検出する第１地絡検出手段と、第２母
線に発生する零相電流から地絡を検出する第２地絡検出
手段と、第１母線と第２母線のうちいずれか一方の母線
に発生する零相電流から地絡を検出する第３地絡検出手
段と、母線連絡遮断器がトリップしたことを検出するト
リップ検出手段と、第１地絡検出手段の検出出力と第３
地絡検出手段の検出出力との論理積を条件に第１起動信
号を出力する第１起動信号発生手段と、第２地絡検出手
段の検出出力と第３地絡検出手段の検出出力との論理積
を条件に第２起動信号を出力する第２起動信号発生手段
と、第１起動信号を一定時間以上入力したときに第１タ
イマ信号を出力する第１タイマと、第２起動信号を一定
時間以上入力したときに第２タイマ信号を出力する第２
タイマと、第１タイマ信号とトリップ検出手段の検出出
力との論理積を条件に第１トリップ信号を出力する第１
トリップ信号発生手段と、第２タイマ信号とトリップ検
出手段の検出出力との論理積を条件に第２トリップ信号
を出力する第２トリップ信号発生手段と、第１トリップ
信号により第１遮断器をトリップする第１トリップ手段
と、第２トリップ信号により第２遮断器をトリップする
第２トリップ手段と、トリップ検出手段の検出出力によ
り母線連絡遮断器をトリップする第３トリップ手段とを
備えている電力系統保護装置。6. A first circuit breaker inserted in a first bus connecting a first load connected to a first AC power supply to a first load, and a second transformer connected to a second AC power supply. A second circuit breaker inserted in a second bus connecting the power supply and the second load, and a bus connection cut-off inserted in a bus connection connecting the output side of the first circuit breaker and the output side of the second circuit breaker A first ground fault detecting means for detecting a ground fault from a zero-sequence current generated in the first bus, a second ground fault detecting means for detecting a ground fault from a zero-sequence current generated in the second bus, A third ground fault detecting means for detecting a ground fault from a zero-phase current generated in one of the first bus and the second bus, a trip detecting means for detecting that the bus communication breaker has tripped, The detection output of the first ground fault detection means and the third
A first activation signal generating means for outputting a first activation signal on condition of a logical product of the detection output of the ground fault detecting means and a detection output of the second ground fault detecting means and a detection output of the third ground fault detecting means; A second activation signal generating means for outputting a second activation signal on condition of a logical product; a first timer for outputting a first timer signal when the first activation signal is inputted for a predetermined time or more; Output the second timer signal when input for more than the second time
A first timer for outputting a first trip signal on condition of a logical product of a timer, a first timer signal and a detection output of the trip detecting means;
Trip signal generating means, second trip signal generating means for outputting a second trip signal on condition of a logical product of the second timer signal and the detection output of the trip detecting means, and tripping the first breaker by the first trip signal Power system comprising: a first trip unit that trips; a second trip unit that trips a second circuit breaker according to a second trip signal; and a third trip unit that trips a bus connection circuit breaker based on a detection output of a trip detection unit. Protective equipment.
線中に挿入された第１遮断器と、第２交流電源と第２負
荷とを結ぶ第２母線中に挿入された第２遮断器と、第１
遮断器の出力側と第２遮断器の出力側とを結ぶ母線連絡
線中に挿入された母線連絡遮断器と、第１母線に短絡事
故が発生したことを検出する第１短絡事故検出手段と、
第２母線に短絡事故が発生したことを検出する第２短絡
事故検出手段と、第１母線と第２母線のうちいずれか一
方の母線に短絡事故が発生したことを検出する第３短絡
事故検出手段と、母線連絡遮断器がトリップしたことを
検出するトリップ検出手段と、第１地絡検出手段の検出
出力と第３地絡検出手段の検出出力との論理積を条件に
第１起動信号を出力する第１起動信号発生手段と、第２
地絡検出手段の検出出力と第３地絡検出手段の検出出力
との論理積を条件に第２起動信号を出力する第２起動信
号発生手段と、第１起動信号を一定時間以上入力したと
きに第１タイマ信号を出力する第１タイマと、第２起動
信号を一定時間以上入力したときに第２タイマ信号を出
力する第２タイマと、第１タイマ信号とトリップ検出手
段の検出出力との論理積を条件に第１トリップ信号を出
力する第１トリップ信号発生手段と、第２タイマ信号と
トリップ検出手段の検出出力との論理積を条件に第２ト
リップ信号を出力する第２トリップ信号発生手段と、第
１トリップ信号により第１遮断器をトリップする第１ト
リップ手段と、第２トリップ信号により第２遮断器をト
リップする第２トリップ手段と、トリップ検出手段の検
出出力により母線連絡遮断器をトリップする第３トリッ
プ手段とを備えている電力系統保護装置。7. A first circuit breaker inserted in a first bus connecting the first AC power supply and the first load, and a first circuit breaker inserted in a second bus connecting the second AC power supply and the second load. 2 circuit breakers and 1st
A bus connection breaker inserted into a bus connection line connecting the output side of the circuit breaker and the output side of the second circuit breaker, and first short-circuit fault detection means for detecting that a short-circuit fault has occurred in the first bus. ,
Second short-circuit fault detection means for detecting that a short-circuit fault has occurred in the second bus, and third short-circuit fault detection for detecting that a short-circuit fault has occurred in one of the first bus and the second bus. Means, a trip detection means for detecting that the bus communication circuit breaker has tripped, and a first start signal on the condition of a logical product of a detection output of the first ground fault detection means and a detection output of the third ground fault detection means. A first activation signal generating means for outputting;
A second start signal generating means for outputting a second start signal on condition of a logical product of a detection output of the ground fault detection means and a detection output of the third ground fault detection means, and when the first start signal is inputted for a predetermined time or more A first timer signal that outputs a first timer signal, a second timer that outputs a second timer signal when a second activation signal is input for a predetermined time or more, and a first timer signal and a detection output of a trip detection unit. First trip signal generating means for outputting a first trip signal on condition of logical product, and second trip signal generating means for outputting a second trip signal on condition of logical product of a second timer signal and a detection output of the trip detecting means Means, first trip means for tripping the first circuit breaker in response to the first trip signal, second trip means for tripping the second circuit breaker in response to the second trip signal, and busbar in accordance with the detection output of the trip detecting means. Power system protection device and a third trip means to trip the fault breaker.
とを結ぶ第１母線中に挿入された第１遮断器と、発電機
と第２負荷とを結ぶ第２母線中に挿入された第２遮断器
と、第１遮断器の出力側と第２遮断器の出力側とを結ぶ
母線連絡線中に挿入された母線連絡遮断器と、第１母線
に短絡事故が発生したことを検出する第１短絡事故検出
手段と、第２母線に短絡事故が発生したことを検出する
第２短絡事故検出手段と、第１母線と第２母線のうちい
ずれか一方の母線に短絡事故が発生したことを検出する
第３短絡事故検出手段と、母線連絡遮断器がトリップし
たことを検出するトリップ検出手段と、第１地絡検出手
段の検出出力と第３地絡検出手段の検出出力との論理積
を条件に第１起動信号を出力する第１起動信号発生手段
と、第２地絡検出手段の検出出力と第３地絡検出手段の
検出出力との論理積を条件に第２起動信号を出力する第
２起動信号発生手段と、第１起動信号を一定時間以上入
力したときに第１タイマ信号を出力する第１タイマと、
第２起動信号を一定時間以上入力したときに第２タイマ
信号を出力する第２タイマと、第１タイマ信号とトリッ
プ検出手段の検出出力との論理積を条件に第１トリップ
信号を出力する第１トリップ信号発生手段と、第２タイ
マ信号とトリップ検出手段の検出出力との論理積を条件
に第２トリップ信号を出力する第２トリップ信号発生手
段と、第１トリップ信号により第１遮断器をトリップす
る第１トリップ手段と、第２トリップ信号により第２遮
断器をトリップする第２トリップ手段と、トリップ検出
手段の検出出力により母線連絡遮断器をトリップする第
３トリップ手段とを備えている電力系統保護装置。8. A first circuit breaker inserted in a first bus connecting the transformer connected to the AC power supply and the first load, and a first circuit breaker inserted in a second bus connecting the generator and the second load. A short circuit accident has occurred in the second circuit breaker, the bus communication circuit breaker inserted in the bus communication line connecting the output side of the first circuit breaker and the output side of the second circuit breaker, and the first bus. First short-circuit accident detecting means for detecting, short-circuit accident detecting means for detecting that a short-circuit accident has occurred in the second bus, and short-circuit accident occurring in one of the first bus and the second bus. A third short-circuit accident detecting means for detecting the occurrence of the fault, a trip detecting means for detecting that the bus communication circuit breaker has tripped, a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means. First activation signal generating means for outputting a first activation signal on condition of a logical product; A second activation signal generating means for outputting a second activation signal on condition of a logical product of a detection output of the stage and a detection output of the third ground fault detection means, and a first activation signal when the first activation signal is inputted for a predetermined time or more. A first timer for outputting a timer signal;
A second timer that outputs a second timer signal when the second start signal is input for a predetermined time or more, and a second timer that outputs a first trip signal on the condition of a logical product of the first timer signal and the detection output of the trip detection means. A first trip signal generating means, a second trip signal generating means for outputting a second trip signal on condition of a logical product of a second timer signal and a detection output of the trip detecting means, and a first trip circuit breaker by the first trip signal. An electric power comprising: first trip means for tripping; second trip means for tripping the second circuit breaker in response to a second trip signal; and third trip means for tripping the bus connection circuit breaker in response to a detection output of the trip detecting means. System protection device.
第１負荷とを結ぶ第１母線中に挿入された第１遮断器
と、第２交流電源に接続された第２変圧器と第２負荷と
を結ぶ第２母線中に挿入された第２遮断器と、第１遮断
器の出力側と第２遮断器の出力側とを結ぶ母線連絡線中
に挿入された母線連絡遮断器と、第１母線に短絡事故が
発生したことを検出する第１短絡事故検出手段と、第２
母線に短絡事故が発生したことを検出する第２短絡事故
検出手段と、第１母線と第２母線のうちいずれか一方の
母線に短絡事故が発生したことを検出する第３短絡事故
検出手段と、母線連絡遮断器がトリップしたことを検出
するトリップ検出手段と、第１地絡検出手段の検出出力
と第３地絡検出手段の検出出力との論理積を条件に第１
起動信号を出力する第１起動信号発生手段と、第２地絡
検出手段の検出出力と第３地絡検出手段の検出出力との
論理積を条件に第２起動信号を出力する第２起動信号発
生手段と、第１起動信号を一定時間以上入力したときに
第１タイマ信号を出力する第１タイマと、第２起動信号
を一定時間以上入力したときに第２タイマ信号を出力す
る第２タイマと、第１タイマ信号とトリップ検出手段の
検出出力との論理積を条件に第１トリップ信号を出力す
る第１トリップ信号発生手段と、第２タイマ信号とトリ
ップ検出手段の検出出力との論理積を条件に第２トリッ
プ信号を出力する第２トリップ信号発生手段と、第１ト
リップ信号により第１遮断器をトリップする第１トリッ
プ手段と、第２トリップ信号により第２遮断器をトリッ
プする第２トリップ手段と、トリップ検出手段の検出出
力により母線連絡遮断器をトリップする第３トリップ手
段とを備えている電力系統保護装置。9. A first circuit breaker inserted in a first bus connecting the first load connected to the first AC power supply to the first load, and a second transformer connected to the second AC power supply. A second circuit breaker inserted in a second bus connecting the power supply and the second load, and a bus connection cut-off inserted in a bus connection connecting the output side of the first circuit breaker and the output side of the second circuit breaker A first short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the first bus;
A second short-circuit fault detecting means for detecting that a short-circuit fault has occurred in the bus, a third short-circuit fault detecting means for detecting that a short-circuit fault has occurred in one of the first bus and the second bus; A trip detecting means for detecting that the bus communication circuit breaker has tripped, and a first output provided by a logical product of a detection output of the first ground fault detecting means and a detection output of the third ground fault detecting means.
A first activation signal generating means for outputting an activation signal, and a second activation signal for outputting a second activation signal on condition of a logical product of a detection output of the second ground fault detection means and a detection output of the third ground fault detection means. Generating means, a first timer for outputting a first timer signal when a first start signal is input for a predetermined time or more, and a second timer for outputting a second timer signal when a second start signal is input for a certain time or more A first trip signal generating means for outputting a first trip signal on condition of a logical product of the first timer signal and a detection output of the trip detecting means, and a logical product of a second timer signal and a detection output of the trip detecting means A second trip signal generating means for outputting a second trip signal on condition of: a first trip means for tripping the first circuit breaker by the first trip signal; and a second means for tripping the second circuit breaker by the second trip signal. Trick Means and, in which electric power system protection device and a third trip means to trip the busbar breaker by detecting the output of the trip detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33844391A JP3223302B2 (en) | 1991-12-20 | 1991-12-20 | Power system protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33844391A JP3223302B2 (en) | 1991-12-20 | 1991-12-20 | Power system protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05176448A JPH05176448A (en) | 1993-07-13 |
| JP3223302B2 true JP3223302B2 (en) | 2001-10-29 |
Family
ID=18318205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33844391A Expired - Fee Related JP3223302B2 (en) | 1991-12-20 | 1991-12-20 | Power system protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3223302B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5564770B2 (en) * | 2008-08-19 | 2014-08-06 | 富士電機株式会社 | Protecting method of electric propulsion system |
| JP5361620B2 (en) * | 2009-09-07 | 2013-12-04 | 株式会社東芝 | Ground fault protection system for substation equipment |
| JP5549297B2 (en) * | 2010-03-19 | 2014-07-16 | 富士電機株式会社 | Protection method of electric propulsion system |
-
1991
- 1991-12-20 JP JP33844391A patent/JP3223302B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05176448A (en) | 1993-07-13 |
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