JP2001251769A - Fault detector in power system - Google Patents
Fault detector in power systemInfo
- Publication number
- JP2001251769A JP2001251769A JP2000055392A JP2000055392A JP2001251769A JP 2001251769 A JP2001251769 A JP 2001251769A JP 2000055392 A JP2000055392 A JP 2000055392A JP 2000055392 A JP2000055392 A JP 2000055392A JP 2001251769 A JP2001251769 A JP 2001251769A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power system
- accident
- inter
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Locating Faults (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電力系統の事故
を検出する装置に関し、特に、誤検出のない装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an accident in a power system, and more particularly to an apparatus for preventing an erroneous detection.
【０００２】[0002]
【従来の技術】図２は、従来の電力系統の事故検出装置
の構成を示す回路図である。３相の連系母線７に商用系
統１が受電用変圧器２を介して接続されるとともに、自
家用の分散電源３が接続されている。負荷６が接続され
た連系母線７には分離遮断器４が介装され、商用系統１
と分散電源３とを分離することができるようになってい
る。連系母線７のそれぞれの相にその相の電流信号を出
力する計器用変流器５が介装され、この計器用変流器５
の出力側に事故検出装置８が接続されている。図にはＵ
相に接続された事故検出装置８だけが示され、その事故
検出装置８は計器用変流器５から出力されるＵ相の電流
信号Ｉ1Uを受けている。事故検出装置８の内部は、点線
の枠内に示されたようにレベル検出回路９と報知回路１
０とで構成されている。レベル検出回路９は、電流信号
Ｉ1Uを受け、この電流信号Ｉ1Uが所定の検出レベルを越
えたときに信号を出力する回路である。報知回路１０は
信号が入力されたときに電力系統に事故が発生したもの
と判断して報知信号を出力する、あるいは表示するなど
して事故を報知する回路である。なお、図示されていな
いが、事故検出装置８は、他の相のＶ相やＷ相にもそれ
ぞれの計器用変流器５を介して同じ様にして接続されて
いる。2. Description of the Related Art FIG. 2 is a circuit diagram showing a configuration of a conventional power system accident detection apparatus. The commercial system 1 is connected to the three-phase interconnection bus 7 via the power receiving transformer 2, and the private power source 3 is connected. A separation circuit breaker 4 is interposed in the interconnection bus 7 to which the load 6 is connected, and
And the distributed power source 3 can be separated. Each of the phases of the interconnection bus 7 is provided with an instrument current transformer 5 for outputting a current signal of the phase, and the instrument current transformer 5
Is connected to an accident detection device 8. The figure shows U
Only the fault detector 8 connected to the phase is shown, which receives the U-phase current signal I 1U output from the current transformer 5 for the instrument. The inside of the accident detection device 8 includes a level detection circuit 9 and a notification circuit 1 as shown in a frame of a dotted line.
0. Level detection circuit 9 receives a current signal I 1U, the current signal I 1U is a circuit for outputting a signal when it exceeds a predetermined detection level. The notification circuit 10 is a circuit that determines that an accident has occurred in the power system when a signal is input, and outputs or displays a notification signal to notify the accident. Although not shown, the accident detection device 8 is similarly connected to the other phases V and W via the respective current transformers 5 for the instruments.
【０００３】図２において、レベル検出回路９の検出レ
ベルを常時流れる負荷電流のレベルより高くしておくこ
とにより、商用系統１側あるいは分散電源３側に事故が
発生した場合、連系母線７に過電流が流れるので報知回
路１０が事故であることを報知する。それによって、連
系母線７を分離遮断器４で遮断するなどして電力系統が
保護される。In FIG. 2, by setting the detection level of the level detection circuit 9 higher than the level of the load current which always flows, if an accident occurs on the commercial system 1 side or the distributed power supply 3 side, the connection bus 7 Since an overcurrent flows, the notification circuit 10 notifies that an accident has occurred. Thus, the power system is protected by, for example, interrupting the interconnection bus 7 with the separation circuit breaker 4.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前述し
たような従来の装置は、事故の発生を誤判定する場合が
あるという問題があった。すなわち、連系母線には、事
故が生じていなくても電力系統の開閉や電圧変動などに
より、異常な波形の電流が侵入する場合があり、常時の
負荷電流と事故時の過電流とのレベル検出だけでは誤検
出する場合があった。その誤検出を避けるために、従来
は、事故と判定する検出レベルが常時の負荷電流のレベ
ルより数倍も高く設定されていた。そのために、従来の
電力系統の事故検出装置は、検出感度が低く、信頼性に
欠けるものであった。この発明の目的は、電力系統の事
故を正確に検出する装置を提供することにある。However, the conventional apparatus as described above has a problem that the occurrence of an accident may be erroneously determined. In other words, even if an accident has not occurred, current with an abnormal waveform may enter the interconnection bus due to switching of the power system or voltage fluctuations even if an accident has not occurred. In some cases, detection alone resulted in erroneous detection. In order to avoid such erroneous detection, conventionally, the detection level for determining an accident has been set several times higher than the level of the normal load current. Therefore, the conventional power system accident detection device has low detection sensitivity and lacks reliability. An object of the present invention is to provide an apparatus for accurately detecting an accident in a power system.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、この発明によれば、商用系統と自家用の分散電源と
が連系母線に挿入された分離遮断器を介して連系運転さ
れている電力系統の事故を検出する装置であって、連系
母線について正常時の相間電圧からその時の相間電圧を
差し引くことによって得られた電圧変化分がその時の相
間電圧を所定分圧比で分圧することによって得られた分
圧値より大きくなるとともに、分離遮断器を流れる電流
が所定レベル以上になったときに電力系統に事故が発生
したものと判定するようにするとよい。それによって、
分離遮断器を流れる電流の大きさに、相間電圧の電圧変
化分の大きさも加えて事故の判断をするので、電力系統
の事故を正確に検出することができる。しかも、相間電
圧の変動が激しい電力系統の場合でも分圧値がその時の
相間電圧をもとにして分圧された値なので、相間電圧の
電圧変化分の大きさが所定の値以上になったことを正確
に把握することができる。According to the present invention, in order to attain the above object, according to the present invention, a commercial power system and a private distributed power source are connected to each other via a separation circuit breaker inserted in a connection bus. A device that detects an accident in the power system in which the voltage change obtained by subtracting the inter-phase voltage at that time from the inter-phase voltage at normal time for the interconnection bus divides the inter-phase voltage at that time by a predetermined voltage division ratio. It is preferable to determine that an accident has occurred in the power system when the divided voltage becomes larger than a predetermined level and the current flowing through the separation circuit breaker exceeds a predetermined level. Thereby,
Since the accident is determined by adding the magnitude of the voltage change of the interphase voltage to the magnitude of the current flowing through the separation circuit breaker, the accident in the power system can be accurately detected. In addition, even in the case of a power system in which the inter-phase voltage fluctuates greatly, the voltage division value is a value obtained by dividing the inter-phase voltage at that time, so that the magnitude of the voltage change of the inter-phase voltage has exceeded a predetermined value. Can be accurately grasped.
【０００６】また、かかる電力系統の事故検出装置にお
いて、前記所定分圧比を任意に設定することができるよ
うにするとよい。それによって、電力系統の電圧変動の
状況が変化しても、分圧比の所定値の設定を変更するだ
けでその状況に対処することができる。[0006] Further, in the accident detection device for an electric power system, it is preferable that the predetermined voltage division ratio can be arbitrarily set. Thereby, even if the situation of the voltage fluctuation of the power system changes, the situation can be dealt with only by changing the setting of the predetermined value of the voltage dividing ratio.
【０００７】[0007]
【発明の実施の形態】以下、この発明を実施例に基づい
て説明する。図１は、この発明の実施例にかかる電力系
統の事故検出装置の構成を示す回路図である。３相の連
系母線７に分離遮断器４が介装され、分離遮断器４の両
側に商用系統１と自家用の分散電源３とが接続されてい
る。この連系母線７の負荷６が接続されている構成は、
図２と同じである。連系母線７のそれぞれの相間にその
相間電圧を出力する計器用変圧器１５が介装されるとと
もに、連系母線７のそれぞれの相にその相の電流を出力
する計器用変流器５が介装されている。事故検出装置１
４がこの電力系統の事故を検出する装置であって、計器
用変圧器１５の出力側および計器用変流器５の出力側に
接続されている。すなわち、事故検出装置１４は、計器
用変圧器１５から出力されるＵ相とＶ相の間の電圧信号
ＶUV、Ｖ相とＷ相の間の電圧信号ＶVW，Ｗ相とＵ相の間
の電圧信号ＶWUをそれぞれ受けるとともに、計器用変流
器５から出力されるＵ相の電流信号Ｉ1U、Ｖ相の電流信
号Ｉ1V、Ｗ相の電流信号Ｉ1Wを受けている。図には、そ
の内の電圧信号ＶUVと電流信号Ｉ1Uだけが示されてい
る。事故検出装置１４の内部は、点線の枠内に示されて
いる。すなわち、電圧変化分検出回路１６は電圧信号Ｖ
UVを受け、連系母線７が正常時のときの電圧信号ＶUVか
らその時の電圧信号ＶUVを差し引いた電圧変化分を比較
器２０側に出力する。また、連系母線７のその時の電圧
信号ＶUVを，整流回路２１が全波整流した信号に成形
し、この整流回路２１の出力信号を分圧回路１７が所定
分圧比でもって分圧し、この分圧された電圧を比較器２
０側に出力する。比較器２０は、電圧変化分検出回路１
６と分圧回路１７との出力信号を受け、電圧変化分検出
回路１６の出力信号が分圧回路１７のそれより大きいと
きに信号を出力する。なお、電圧変化分検出回路１６の
出力信号は、上記のように連系母線７が正常時のときの
電圧信号ＶUVからその時の電圧信号ＶUVを差し引いた電
圧変化分であるため、その極性は、その時の位相によっ
て正極性および負極性のいずれにもなるが、比較器２０
は、その内部回路で、電圧変化分検出回路１６の出力信
号の絶対値と分圧回路１７の出力信号とを比較するよう
に構成されている。一方、レベル検出回路９は、電流信
号Ｉ1Uを受け、この電流信号Ｉ1Uが所定のレベルを越え
たときに信号を出力する。アンド回路１８は、比較器２
０とレベル検出回路９との双方から信号を受けたときに
オア回路１９に信号を出力する。この事故検出装置１４
において、アンド回路１８までの構成は図では１つしか
示されていないが、同じ構成のものが全部で３相分配さ
れてあり、残りの相の構成はそれぞれ電圧信号ＶVWと電
流信号Ｉ1V、電圧信号ＶWUと電流信号Ｉ1Wを受けてい
る。オア回路１９は、各相からのアンド回路１８の出力
信号Ｗ1 を受け、どの相か１相からでも出力信号を受け
たとき報知回路１０に信号を出力するようになってい
る。報知回路１０は、オア回路１９からの信号を受けた
ときに報知信号を出力する、あるいは表示するなどして
事故を報知する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a circuit diagram showing a configuration of an apparatus for detecting an accident in a power system according to an embodiment of the present invention. A separation circuit breaker 4 is interposed in the three-phase interconnection bus 7, and the commercial system 1 and the private distributed power supply 3 are connected to both sides of the separation circuit breaker 4. The configuration of the interconnection bus 7 to which the load 6 is connected is as follows.
It is the same as FIG. An instrument transformer 15 for outputting an inter-phase voltage is interposed between each phase of the interconnection bus 7, and an instrument current transformer 5 for outputting a current of the phase to each phase of the interconnection bus 7 is provided. It is interposed. Accident detection device 1
Reference numeral 4 denotes a device for detecting an accident in the power system, which is connected to the output side of the instrument transformer 15 and the output side of the instrument current transformer 5. That is, the fault detection device 14 outputs the voltage signal V UV between the U-phase and the V-phase output from the instrument transformer 15, the voltage signal V VW between the V-phase and the W-phase, and the voltage signal V VW between the V-phase and the W-phase. with receiving of a voltage signal V WU respectively, receiving U-phase current signals I 1U output from the current transformer 5, V-phase current signals I 1V, the current signal I 1W of W-phase. In the figure, only the voltage signal VUV and the current signal I1U are shown. The inside of the accident detection device 14 is shown in a dotted frame. That is, the voltage change detection circuit 16 outputs the voltage signal V
In response to the UV , the voltage change obtained by subtracting the voltage signal VUV at that time from the voltage signal VUV when the interconnection bus 7 is normal is output to the comparator 20 side. Further, a voltage signal V UV at that time the interconnection bus 7, and formed into a signal rectifier circuit 21 is full-wave rectified, the output signal of the rectifier circuit 21 the voltage dividing circuit 17 divides with at ratio predetermined amount, this The divided voltage is applied to the comparator 2
Output to the 0 side. The comparator 20 includes a voltage change detection circuit 1
6 and the output signal of the voltage dividing circuit 17, and outputs a signal when the output signal of the voltage change detecting circuit 16 is larger than that of the voltage dividing circuit 17. Since the output signal of the voltage change detection circuit 16 is a voltage change obtained by subtracting the voltage signal VUV at that time from the voltage signal VUV when the interconnection bus 7 is normal as described above, Becomes positive or negative depending on the phase at that time.
Is configured to compare the absolute value of the output signal of the voltage change detecting circuit 16 with the output signal of the voltage dividing circuit 17 in its internal circuit. On the other hand, level detection circuit 9 receives current signal I 1U and outputs a signal when current signal I 1U exceeds a predetermined level. The AND circuit 18 includes the comparator 2
When a signal is received from both 0 and the level detection circuit 9, the signal is output to the OR circuit 19. This accident detection device 14
In the figure, only one configuration up to the AND circuit 18 is shown in the figure, but the same configuration is divided into three phases in total, and the configurations of the remaining phases are the voltage signal V VW and the current signal I 1V, respectively. , A voltage signal V WU and a current signal I 1W . OR circuit 19 receives the output signal W 1 of the AND circuit 18 from the respective phases, and outputs a signal to the informing circuit 10 when receiving the output signal from any phase or one phase. The notification circuit 10 outputs or displays a notification signal when receiving a signal from the OR circuit 19, and notifies the accident.
【０００８】図１において、電圧変化分検出回路１６は
内部に記憶回路を備え、正常な時の電圧波形を予め記憶
し、連系母線７の正常時の相間電圧からその時の相間電
圧を差し引いた電圧変化分を出力するようになってい
る。事故時には、必ず連系母線７の電圧変化分が増大す
るとともに、分離遮断器４を流れる電流が増大するの
で、連系母線７の電圧変化分および分離遮断器４の電流
がいずれも所定のレベル以上になったときに電力系統に
事故が発生したものと判断して報知するようになってい
る。その場合、分圧回路１７および整流回路２１を除外
するとともに比較器２０を入力電圧が所定のレベルを越
えたときに信号を出力するレベル検出回路としてもよ
い。それによって、アンド回路１８が連系母線７の正常
時の相間電圧からその時の相間電圧を差し引いた電圧変
化分と、分離遮断器４を流れる電流とがいずれも所定の
レベル以上になった時に電力系統に事故が発生したもの
と判断するようになる。しかし、この構成では、事故で
なくてもその時の相間電圧自体が激しく変動した場合に
電圧変化分が大きくなる瞬間があり、装置が誤検出する
可能性がある。図１の実施例のように、その時の相間電
圧値を分圧回路１７に入力させ、この分圧回路１７の出
力電圧をベースにして電圧変化分の大きさを比較するこ
とによって、相間電圧が激しく変動しても装置が誤検出
することがなくなった。In FIG. 1, the voltage change detecting circuit 16 has a storage circuit therein, stores a normal voltage waveform in advance, and subtracts the normal phase voltage of the interconnection bus 7 from the normal phase voltage. A voltage change is output. In the event of an accident, the voltage change of the interconnection bus 7 always increases and the current flowing through the separation circuit breaker 4 increases, so that both the voltage variation of the interconnection bus 7 and the current of the separation circuit breaker 4 have a predetermined level. When this happens, it is determined that an accident has occurred in the power system and the system is notified. In that case, the voltage dividing circuit 17 and the rectifying circuit 21 may be omitted, and the comparator 20 may be a level detecting circuit that outputs a signal when the input voltage exceeds a predetermined level. As a result, when the AND circuit 18 subtracts the phase voltage at that time from the normal phase voltage of the interconnection bus 7 and the current flowing through the separation circuit breaker 4 both become higher than a predetermined level, The system will determine that an accident has occurred. However, in this configuration, even if it is not an accident, when the inter-phase voltage itself fluctuates drastically, there is a moment when the voltage change becomes large, and the device may erroneously detect. As in the embodiment of FIG. 1, the inter-phase voltage value at that time is input to the voltage dividing circuit 17, and the magnitude of the voltage change is compared based on the output voltage of the voltage dividing circuit 17, so that the inter-phase voltage is reduced. The device no longer erroneously detects even if it fluctuates violently.
【０００９】なお、分圧回路１７は所定の分圧比を任意
に設定できるように構成され、分圧比の所定値の設定を
変更するだけで電力系統の電圧変動の状況に対処するこ
とができるようになっている。その分圧比は、例えば１
０％，２０％，３０％、・・と変えることができ、電力
系統の電圧変動の状況が時間的に変化しても、また、こ
の装置を別の系統に移しても簡単に分圧比の設定を変え
ることができ装置の取り扱いが容易になった。The voltage dividing circuit 17 is configured to be able to arbitrarily set a predetermined voltage dividing ratio, and can cope with the situation of voltage fluctuation of the power system only by changing the setting of the predetermined value of the voltage dividing ratio. It has become. The partial pressure ratio is, for example, 1
0%, 20%, 30%,... Even if the situation of voltage fluctuation of the power system changes over time, or if this device is moved to another system, the division ratio can be easily changed. The settings can be changed, and the handling of the device has become easier.
【００１０】また、上述の図１の実施例における事故検
出装置１４において、分圧回路１７の入力側の整流回路
２１は設けないで、比較器２０の内部回路で電圧変化分
検出回路１６の出力信号の絶対値と分圧回路１７の出力
信号の絶対値とを比較するようにした構成とすることも
できる。Further, in the accident detecting apparatus 14 in the embodiment of FIG. 1 described above, the rectifier circuit 21 on the input side of the voltage dividing circuit 17 is not provided, and the output of the voltage change detecting circuit 16 is output by the internal circuit of the comparator 20. It is also possible to adopt a configuration in which the absolute value of the signal is compared with the absolute value of the output signal of the voltage dividing circuit 17.
【００１１】[0011]
【発明の効果】この発明は前述のように、連系母線につ
いて正常時の相間電圧からその時の相間電圧を差し引く
ことによって得られた電圧変化分がその時の相間電圧を
所定分圧比で分圧することによって得られた分圧値より
大きくなるとともに、分離遮断器を流れる電流が所定レ
ベル以上になったときに電力系統に事故が発生したもの
と判定するようにすることによって、電力系統の事故を
正確に検出することができ、相間電圧の変動が激しい電
力系統の場合でも装置が誤検出することがなくなった。As described above, according to the present invention, the voltage change obtained by subtracting the inter-phase voltage at that time from the inter-phase voltage at the normal time with respect to the interconnection bus is to divide the inter-phase voltage at that time by a predetermined division ratio. The power system fault can be accurately determined by determining that a fault has occurred in the power system when the current flowing through the separation circuit breaker exceeds a predetermined level, as well as when the voltage becomes larger than the divided voltage value obtained by This prevents the device from erroneously detecting even in a power system in which the inter-phase voltage fluctuates greatly.
【００１２】また、かかる電力系統の事故検出装置にお
いて、前記所定分圧比を任意に設定することができるよ
うにするとよい。それによって、分圧比の所定値の設定
を変更するだけで電力系統の電圧変動の状況に対処する
ことができ、装置の取り扱いが容易になった。また、こ
の装置を別の系統に移すことも容易である。[0012] Further, in the power system accident detection device, it is preferable that the predetermined voltage division ratio can be arbitrarily set. As a result, it is possible to cope with the situation of the voltage fluctuation of the power system only by changing the setting of the predetermined value of the division ratio, and the handling of the device is facilitated. It is also easy to transfer this device to another system.
【図１】この発明の実施例にかかる電力系統の事故検出
装置の構成を示す回路図FIG. 1 is a circuit diagram showing a configuration of an accident detection device for a power system according to an embodiment of the present invention.
【図２】従来の電力系統の事故検出装置の構成を示す回
路図FIG. 2 is a circuit diagram showing the configuration of a conventional power system accident detection device.
１ 商用系統 ２ 受電用変圧器 ３ 分散電源 ４ 分離遮断器 ５ 計器用変流器 ６ 負荷 ７ 連系母線 ８，１４，１４Ａ 事故検出装置 ９ レベル検出回路 １０ 報知回路 １５ 計器用変圧器 １６ 電圧変化分検出回路 １７ 分圧回路 １８ アンド回路 １９ オア回路 ２０ 比較器 ２１ 整流回路 ＶUV，ＶVW，ＶWU 電圧信号 Ｉ1U，Ｉ1V，Ｉ1W， 電流信号 Ｗ1 他相からの信号DESCRIPTION OF SYMBOLS 1 Commercial system 2 Power receiving transformer 3 Distributed power supply 4 Separation circuit breaker 5 Instrument current transformer 6 Load 7 Interconnection bus 8,14,14A Accident detection device 9 Level detection circuit 10 Notification circuit 15 Instrument transformer 16 Voltage change min detection circuit 17 dividing circuit 18 and circuit 19 OR circuit 20 comparator 21 rectifier circuit V UV, V VW, V WU voltage signal I 1U, I 1V, I 1W , current signal W 1 signals from other phases
Claims (2)
に挿入された分離遮断器を介して連系運転されている電
力系統の事故を検出する装置であって、連系母線につい
て正常時の相間電圧からその時の相間電圧を差し引くこ
とによって得られた電圧変化分がその時の相間電圧を所
定分圧比で分圧することによって得られた分圧値より大
きくなるとともに、分離遮断器を流れる電流が所定レベ
ル以上になったときに電力系統に事故が発生したものと
判定することを特徴とする電力系統の事故検出装置。An apparatus for detecting an accident in a power system in which a commercial system and a private distributed power supply are connected to each other via a disconnecting circuit breaker inserted in a connection bus, and detects an abnormality in the connection bus. The voltage change obtained by subtracting the current inter-phase voltage from the current inter-phase voltage becomes larger than the divided voltage obtained by dividing the current inter-phase voltage by a predetermined voltage division ratio, and the current flowing through the separation circuit breaker. An accident detection device for an electric power system, wherein it is determined that an accident has occurred in the electric power system when is higher than a predetermined level.
において、前記所定分圧比を任意に設定することができ
ることを特徴とする電力系統の事故検出装置。2. An apparatus for detecting an accident in a power system according to claim 1, wherein said predetermined division ratio can be set arbitrarily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000055392A JP2001251769A (en) | 2000-03-01 | 2000-03-01 | Fault detector in power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000055392A JP2001251769A (en) | 2000-03-01 | 2000-03-01 | Fault detector in power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001251769A true JP2001251769A (en) | 2001-09-14 |
Family
ID=18576522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000055392A Pending JP2001251769A (en) | 2000-03-01 | 2000-03-01 | Fault detector in power system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001251769A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075498A (en) * | 2001-09-03 | 2003-03-12 | Osaka Gas Co Ltd | Outage detection apparatus of power system |
| CN104090212A (en) * | 2014-07-16 | 2014-10-08 | 国家电网公司 | Circuit phase-to-phase fault locating method needless of voltage memory before fault occurs |
| CN114720902A (en) * | 2022-04-07 | 2022-07-08 | 国网黑龙江省电力有限公司佳木斯供电公司 | Direct-current power supply fault rapid isolation system for transformer substation |
-
2000
- 2000-03-01 JP JP2000055392A patent/JP2001251769A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075498A (en) * | 2001-09-03 | 2003-03-12 | Osaka Gas Co Ltd | Outage detection apparatus of power system |
| CN104090212A (en) * | 2014-07-16 | 2014-10-08 | 国家电网公司 | Circuit phase-to-phase fault locating method needless of voltage memory before fault occurs |
| CN104090212B (en) * | 2014-07-16 | 2016-06-08 | 国家电网公司 | Without the need to the line inter-phase fault localization method of the memory of voltage before fault |
| CN114720902A (en) * | 2022-04-07 | 2022-07-08 | 国网黑龙江省电力有限公司佳木斯供电公司 | Direct-current power supply fault rapid isolation system for transformer substation |
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