JPH07298499A - Apparatus for detecting power fluctuation of power system - Google Patents
Apparatus for detecting power fluctuation of power systemInfo
- Publication number
- JPH07298499A JPH07298499A JP6089356A JP8935694A JPH07298499A JP H07298499 A JPH07298499 A JP H07298499A JP 6089356 A JP6089356 A JP 6089356A JP 8935694 A JP8935694 A JP 8935694A JP H07298499 A JPH07298499 A JP H07298499A
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- Prior art keywords
- circuit
- output
- detection
- power
- phase
- 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.)
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- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は電力系統において電力
動揺検出出力に応じ保護継電装置から出力される遮断指
令を阻止する電力動揺検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power fluctuation detecting device for blocking a cutoff command output from a protective relay device in response to a power fluctuation detection output in a power system.
【０００２】[0002]
【従来の技術】図１２は日本の電力会社各社と電源開発
株式会社とでＪＩＳ規格にもとづき制定された電力用規
格Ｂ−４０１「保護継電器および保護継電装置」の第９
０頁に示された、従来の直接接地系（短絡）の保護継電
方式を示す構成図、図１３は例えば昭和５６年６月５日
に社団法人電気共同研究会から発行された雑誌「電気共
同研究」の第３７巻；第１号の第６５頁に示されたモー
リレーの設置位置を原点とする一般的な動作波形図であ
って、図１３の横軸はインピーダンスの抵抗分Ｒを表
し、図１３の縦軸はインピーダンスのリアクタンス分Ｘ
を表し、この図１３上においてモーリレーの位相特性を
表現でき、図１４乃至図１７は同従来の作用を説明する
ためのタイミングチャートである。2. Description of the Related Art FIG. 12 is a ninth part of the power standard B-401 "Protective relay and protective relay device" established by the Japanese power companies and Power Development Co., Ltd. based on the JIS standard.
Fig. 13 is a block diagram showing the protection relay system of the conventional direct grounding system (short circuit) shown on page 0. Fig. 13 is, for example, the magazine "Electricity" published by the Electric Power Joint Research Group on June 5, 1981. Collaborative Research ”, Vol. 37; No. 1, p. 65, which is a general operation waveform diagram with the installation position of the mo-relay as the origin. The horizontal axis of FIG. 13 represents the resistance component R of the impedance. , The vertical axis of FIG. 13 is the reactance component X of impedance
The phase characteristics of the Mohrelay can be expressed on this FIG. 13, and FIGS. 14 to 17 are timing charts for explaining the operation of the related art.
【０００３】図１２において、１は電力系統の事故検出
に応じ遮断指令を電力系統に設けられた図外の遮断器や
図外の開閉器などに出力する保護継電装置、２は電力系
統の電力動揺検出に応じ保護継電装置１の遮断指令を阻
止する電力動揺検出装置、３，４，５は電力系統の線間
第１相、線間第２相および線間第３相それぞれの１段保
護を行う短絡１段モーリレー（図中には記号、４４Ｓ−
１Ｘ１，４４Ｓ−２Ｘ１，４４Ｓ−３Ｘ１を付してあ
る）、６，７，８は電力系統の線間第１相、線間第２相
および線間第３相それぞれの２段保護を行う短絡２段モ
ーリレー（図中には記号、４４Ｓ−１Ｘ２，４４Ｓ−２
Ｘ２，４４Ｓ−３Ｘ２を付してある）、９，１０，１１
は電力系統の線間第１相、線間第２相および線間第３相
それぞれの３段保護を行う短絡３段モーリレー（図中に
は記号、４４Ｓ−１Ｄ，４４Ｓ−２Ｄ，４４Ｓ−３Ｄを
付してある）、１２は電力系統の線間第１相、線間第２
相および線間第３相のうちでの線間１相の電力動揺を検
出する短絡オフセットモーリレー（図中には記号、４４
０Ｍを付してある）、１３，１４，１５は短絡１段モー
リレー３乃至５の出力と短絡３段モーリレー９乃至１１
の出力とを入力とするアンド回路、１６はアンド回路１
３乃至１５の出力を入力とする１段出力用オア回路、１
７は１段出力用オア回路１６の出力を入力とし電力動揺
検出装置２からの出力を禁止入力とする１段保護出力用
禁止回路、１８，１９，２０は短絡２段モーリレー６乃
至８の出力と短絡３段モーリレー９乃至１１の出力とを
入力とするアンド回路、２１はアンド回路１８乃至１９
の出力を入力とする２段出力用オア回路、２２および２
７は短絡３段モーリレー９乃至１１の出力を入力とする
３段出力用オア回路、２３はオア回路２２の出力を入力
とする２段保護用の限時動作回路を構成する２段保護用
タイマー、２４はオア回路２２の出力を入力とする３段
保護用の限時動作回路を構成する３段保護用タイマー、
２５は２段保護用タイマー２３とオア回路２１を入力と
する２段保護出力用のアンド回路、２６は１段保護出力
用禁止回路１７の１段保護出力と２段保護出力用アンド
回路２５の２段保護出力と３段保護用タイマー２４の３
段保護出力とを入力とする遮断指令出力用オア回路、２
８は３段出力用オア回路２７の３段出力を禁止入力とし
短絡オフセットモーリレー１２の出力を入力とする禁止
回路、２９は禁止回路２８の出力を入力とする限時動作
回路を構成する電力動揺検出用タイマー、３０は禁止回
路２８の出力を入力とする限時動作・限時復帰回路を構
成する電力動揺検出保持用タイマー、３１は電力動揺検
出保持用タイマー３０の出力と電力動揺検出用タイマー
２９の出力とを入力とする電力動揺検出出力用オア回路
である。In FIG. 12, 1 is a protective relay device that outputs a disconnection command to a circuit breaker (not shown) or a switch (not shown) provided in the power system in response to detection of an accident in the power system, and 2 is a power system. A power fluctuation detection device for blocking a cutoff command of the protective relay device 1 in response to the detection of power fluctuation, 3, 4 and 5 are 1 of each of the first phase between lines, the second phase between lines and the third phase between lines. Short-circuit 1-stage mo-relay for step protection (symbol in the figure, 44S-
1X1, 44S-2X1, 44S-3X1 are attached), 6, 7, and 8 are short circuits for performing two-stage protection for each of the first phase between lines, the second phase between lines, and the third phase between lines. Two-stage Morrelay (symbols in the figure, 44S-1X2, 44S-2
X2, 44S-3X2 are attached), 9, 10, 11
Is a short-circuited three-stage mo-relay (symbols 44S-1D, 44S-2D, 44S-3D in the figure) that perform three-stage protection for each of the line first phase, line second phase, and line third phase of the power system. , 12 is the first phase between lines of the power system, the second line between lines
Short circuit offset mode relay that detects the power fluctuation of one phase between the lines and the third phase between the lines (in the figure, a symbol, 44
0, M), 13, 14, and 15 are the outputs of the short-circuited first-stage Morre relays 3 to 5 and the short-circuited third-stage Morre relays 9 to 11.
AND circuit whose input is the output of and AND circuit 16 is an AND circuit 1
1-stage output OR circuit that inputs 3 to 15 outputs, 1
Reference numeral 7 is a one-stage protection output inhibition circuit that receives the output of the one-stage output OR circuit 16 as an input and the output from the power fluctuation detection device 2 as an inhibition input, and 18, 19 and 20 are outputs of the short-circuited two-stage moire relays 6 to 8. And AND circuits which receive the outputs of the short-circuited three-stage Mohre relays 9 to 11, and 21 are AND circuits 18 to 19
Two-stage output OR circuit for inputting the output of
Reference numeral 7 is a three-stage output OR circuit that receives the outputs of the short-circuited three-stage Mohre relays 9 to 11, and 23 is a two-stage protection timer that constitutes a time-delay operation circuit for two-stage protection that receives the output of the OR circuit 22. Reference numeral 24 is a timer for three-stage protection, which constitutes a time-delay operation circuit for three-stage protection, which receives the output of the OR circuit 22 as an input,
Reference numeral 25 denotes a two-stage protection output AND circuit for inputting the two-stage protection timer 23 and the OR circuit 21, and 26 denotes one-stage protection output of the one-stage protection output prohibition circuit 17 and two-stage protection output AND circuit 25. 3 of 2 steps protection output and 3 steps protection timer 24
Shutdown command output OR circuit that receives the stage protection output and 2
Reference numeral 8 is a prohibition circuit having the three-stage output of the three-stage output OR circuit 27 as a prohibition input and the output of the short-circuit offset Moire relay 12 as an input, and 29 is a power fluctuation which constitutes a time-delay operation circuit having the output of the prohibition circuit 28 as an input. A timer for detection, 30 is a timer for power fluctuation detection and holding which constitutes a time-delayed operation / time-return circuit which receives the output of the prohibition circuit 28, and 31 is an output of the timer 30 for power fluctuation detection and holding and a timer 29 for power fluctuation detection. It is an OR circuit for power fluctuation detection output that receives the output and.
【０００４】上記従来例の動作を図１３乃至図１７を参
照しつつ説明する。電力系統において電力動揺が発生す
ると、電流の変化および電圧の変化は系統事故時の電流
の変化および電圧の変化よりも緩慢に変化し、図１３に
示す動揺時のインピーダンス軌跡をたどる。この動揺時
のインピーダンス軌跡によれば、時刻ｔ１において短絡
オフセットモーリレー１２が動作した後、時刻ｔ２にお
いて短絡モーリレー９乃至１１が動作する。この動作時
刻ｔ１と動作時刻ｔ２との間の時間差ｔ１−ｔ２が電力
動揺検出用タイマー２９の限時動作値以上であれば、電
力系統に電力動揺が発生していることを意味するものと
し、電力動揺検出装置２が電力動揺検出出力として高電
位の「１」を１段保護出力用禁止回路１７の禁止入力に
出力する。よって、上記短絡モーリレー３乃至５が短絡
モーリレー９乃至１１と同時かまたは遅れて動作して
も、１段保護出力用禁止回路１７が遮断指令出力用オア
回路２６に無効信号として低電位の「０」を出力し続け
るので、遮断指令出力用オア回路２６が遮断指令を出力
しない。つまり、電力動揺検出装置２が高電位の「１」
なる電力動揺検出出力を１段保護出力用禁止回路１７の
禁止入力に出力することによって、保護継電装置１が遮
断指令を不要に出力するのを、電力動揺検出装置２があ
らかじめ阻止する。The operation of the above conventional example will be described with reference to FIGS. When the power fluctuation occurs in the power system, the change in the current and the change in the voltage change more slowly than the change in the current and the change in the voltage at the time of system failure, and follow the impedance locus during the fluctuation shown in FIG. According to the impedance locus at the time of sway, after the short circuit offset Moh relay 12 operates at the time t1, the short circuit Moh relays 9 to 11 operate at the time t2. If the time difference t1-t2 between the operation time t1 and the operation time t2 is equal to or greater than the time limit operation value of the power fluctuation detection timer 29, it means that power fluctuation is occurring in the power system, and The fluctuation detector 2 outputs a high potential "1" as a power fluctuation detection output to the prohibition input of the one-stage protection output prohibition circuit 17. Therefore, even if the short circuit mode relays 3 to 5 operate at the same time or after the short circuit mode relays 9 to 11, the one-stage protection output inhibition circuit 17 outputs the low potential "0" to the shutoff command output OR circuit 26 as an invalid signal. Is output continuously, the shutoff command output OR circuit 26 does not output the shutoff command. That is, the power fluctuation detection device 2 has a high potential "1".
By outputting the power fluctuation detection output to the prohibition input of the one-stage protection output prohibition circuit 17, the power fluctuation detection apparatus 2 blocks in advance the protection relay device 1 from outputting the interruption command unnecessarily.
【０００５】また、図１３に示す動揺時のインピーダン
ス軌跡が短絡モーリレー９乃至１１の保護範囲内から短
絡オフセットモーリレー１２の保護範囲内に移動する
と、３段出力用オア回路２７が低電位の「０」を禁止回
路２８の禁止入力に出力し、禁止回路２８が高電位の
「１」を動揺検出用タイマ２９および動揺検出保持用タ
イマ３０に出力し、電力動揺検出出力用オア回路３１が
上記動揺検出用タイマ２９または動揺検出保持用タイマ
３０のいずれか一方の短い方の限時動作を以て高電位の
「１」を１段保護出力用禁止回路１７の禁止入力に出力
する。引き続き、動揺時のインピーダンス軌跡が上記短
絡モーリレー９乃至１１の保護範囲と短絡オフセットモ
ーリレー１２の保護範囲との間から短絡オフセットモー
リレー１２の保護範囲外に移動すると、禁止回路２８が
低電位の「０」を動揺検出用タイマ２９および動揺検出
保持用タイマ３０に出力し、動揺検出用タイマ２９から
の出力が低電位の「０」となった状態において、電力動
揺検出出力用オア回路３１が動揺検出保持用タイマ３０
の限時復帰を以て低電位の「０」を１段保護出力用禁止
回路１７の禁止入力に出力する。よって、上記動揺時の
インピーダンス軌跡が短絡モーリレー９乃至１１の保護
範囲内から短絡オフセットモーリレー１２の保護範囲外
に移動すると、１段保護出力用禁止回路１７が動揺検出
保持用タイマ３０の限時復帰後に遮断指令出力用オア回
路２６に有効信号として高電位の「１」を出力し得るこ
とになる。つまり、電力動揺検出装置２が動揺検出保持
用タイマ３０の限時復帰後に低電位の「０」なる電力動
揺検出出力を１段保護出力用禁止回路１７の禁止入力に
出力することによって、保護継電装置１が遮断指令を出
力し得る状態に復帰する。Further, when the impedance locus during oscillation shown in FIG. 13 moves from within the protection range of the short circuit mode relays 9 to 11 to within the protection range of the short circuit offset mode relay 12, the three-stage output OR circuit 27 has a low potential. 0 "is output to the prohibition input of the prohibition circuit 28, the prohibition circuit 28 outputs high potential" 1 "to the fluctuation detection timer 29 and the fluctuation detection holding timer 30, and the OR circuit 31 for power fluctuation detection output outputs the above. Higher potential "1" is output to the inhibition input of the one-stage protection output inhibition circuit 17 by the shorter time-delaying operation of either the oscillation detection timer 29 or the oscillation detection holding timer 30. Subsequently, when the impedance locus at the time of shaking moves from between the protection range of the short circuit mode relays 9 to 11 and the protection range of the short circuit offset mode relay 12 to the outside of the protection range of the short circuit mode relay 12, the prohibition circuit 28 has a low potential. "0" is output to the shaking detection timer 29 and the shaking detection holding timer 30, and when the output from the shaking detection timer 29 becomes "0" of low potential, the power shaking detection output OR circuit 31 Motion detection and holding timer 30
The low potential "0" is output to the prohibition input of the one-stage protection output prohibition circuit 17 after the time delay recovery. Therefore, when the impedance locus at the time of sway moves from within the protection range of the short circuit mode relays 9 to 11 to outside the protection range of the short circuit offset mode relay 12, the one-stage protection output prohibiting circuit 17 resets the sway detection holding timer 30 in time. Later, a high potential "1" can be output to the shutoff command output OR circuit 26 as an effective signal. In other words, the power fluctuation detection device 2 outputs the power fluctuation detection output of low potential “0” after the time limit recovery of the fluctuation detection holding timer 30 to the prohibition input of the one-stage protection output prohibition circuit 17, whereby the protection relay is protected. The device 1 returns to a state in which it can output the cutoff command.
【０００６】一方、動揺検出中において短絡モーリレー
９乃至１１の保護範囲内に図１３に符号Ｆ１で示す系統
事故が発生すると、図１４に示すように動揺検出保持用
タイマ３０の限時復帰Ｔｒが２段保護用タイマー２３お
よび３段保護用タイマー２４の限時動作Ｔｔより大きい
場合（Ｔｒ＞Ｔｔ）には、２段保護用タイマー２３およ
び３段保護用タイマー２４が限時動作後に動作信号とし
て高電位の「１」を遮断指令出力用オア回路２６に出力
し、この遮断指令出力用オア回路２６が遮断指令を出力
し、逆に図１５に示すように動揺検出保持用タイマ３０
の限時復帰Ｔｒが２段保護用タイマー２３および３段保
護用タイマー２４の限時動作Ｔｔより小さい場合（Ｔｒ
＜Ｔｔ）には、電力動揺検出保持用タイマー３０が限時
復帰を待って動作信号として低電位の「０」を１段保護
出力用禁止回路１７の禁止入力に出力し、この１段保護
出力用禁止回路１７が有効信号として「１」を遮断指令
出力用オア回路２６に出力し、この遮断指令出力用オア
回路２６が遮断指令を出力する。On the other hand, when a system fault indicated by the symbol F1 in FIG. 13 occurs within the protection range of the short circuit mode relays 9 to 11 during vibration detection, the time delay recovery Tr of the vibration detection holding timer 30 becomes 2 as shown in FIG. When it is larger than the time-delayed operation Tt of the stage protection timer 23 and the 3-stage protection timer 24 (Tr> Tt), the 2-stage protection timer 23 and the 3-stage protection timer 24 have a high potential as an operation signal after the time-delayed operation. "1" is output to the shutoff command output OR circuit 26, and this shutoff command output OR circuit 26 outputs the shutoff command. Conversely, as shown in FIG.
If the time delay recovery Tr is smaller than the time delay operation Tt of the two-stage protection timer 23 and the three-stage protection timer 24 (Tr
At <Tt, the power fluctuation detection and holding timer 30 waits for the time-limit recovery and outputs a low potential "0" as an operation signal to the prohibition input of the one-stage protection output prohibition circuit 17, and the one-stage protection output The prohibition circuit 17 outputs "1" as an effective signal to the cutoff command output OR circuit 26, and the cutoff command output OR circuit 26 outputs a cutoff command.
【０００７】また、短絡オフセットモーリレー１２が動
作し、短絡モーリレー９乃至１１が不動作となる図１３
に符号Ｆ２で示す遠方の系統事故に引き続き、短絡モー
リレー９乃至１１の保護範囲内に図１３に符号Ｆ１で示
す系統事故が発生すると、図１６に示すように動揺検出
保持用タイマ３０の限時復帰Ｔｒが２段保護用タイマー
２３および３段保護用タイマー２４の限時動作Ｔｔより
大きい場合（Ｔｒ＞Ｔｔ）には、２段保護用タイマー２
３および３段保護用タイマー２４が限時動作後に動作信
号として高電位の「１」を遮断指令出力用オア回路２６
に出力し、この遮断指令出力用オア回路２６が遮断指令
を出力し、逆に図１７に示すように動揺検出保持用タイ
マ３０の限時復帰Ｔｒが２段保護用タイマー２３および
３段保護用タイマー２４の限時動作Ｔｔより小さい場合
（Ｔｒ＜Ｔｔ）には、電力動揺検出保持用タイマー３０
が限時復帰を待って動作信号として低電位の「０」を１
段保護出力用禁止回路１７の禁止入力に出力し、この１
段保護出力用禁止回路１７が有効信号として「１」を遮
断指令出力用オア回路２６に出力し、この遮断指令出力
用オア回路２６が遮断指令を出力する。Further, the short circuit offset mode relay 12 operates and the short circuit mode relays 9 to 11 are inoperative.
When the system fault indicated by the symbol F1 in FIG. 13 occurs within the protection range of the short-circuit Moire relays 9 after the distant system fault indicated by the symbol F2 in FIG. When Tr is larger than the time-limit operation Tt of the two-step protection timer 23 and the three-step protection timer 24 (Tr> Tt), the two-step protection timer 2
The OR circuit 26 for outputting a cutoff command outputs "1" of high potential as an operation signal after the timer 24 for three- and three-stage protection has timed
The OR circuit 26 for outputting the cutoff command outputs the cutoff command, and conversely, as shown in FIG. 17, the time delay recovery Tr of the shaking detection and holding timer 30 is the two-step protection timer 23 and the three-step protection timer. When it is smaller than the time-delay operation Tt of 24 (Tr <Tt), the power fluctuation detection and holding timer 30
Waits for the timed return and sets the low potential "0" to 1 as the operation signal.
This is output to the inhibit input of the stage protection output inhibit circuit 17
The stage protection output inhibition circuit 17 outputs "1" as an effective signal to the cutoff command output OR circuit 26, and the cutoff command output OR circuit 26 outputs a cutoff command.
【０００８】さらに、図外の地絡保護継電装置の保護区
間内の１相地絡事故が発生した場合でも、上記短絡オフ
セットモーリレー１２の保護範囲が広いために、この短
絡オフセットモーリレー１２が動作し、電力動揺検出装
置２が高電位の「１」なる電力動揺検出出力を１段保護
出力用禁止回路１７の禁止入力に出力し、保護継電装置
１の遮断指令が不要に阻止される状態となる。このよう
な１相地絡事故に引き続き２相以上の系統事故が発生し
た場合には、短絡オフセットモーリレー１２が動作し、
保護継電装置１からの電力系統を遮断するための遮断指
令が、上記と同様に動揺検出保持用タイマ３０の限時復
帰Ｔｒと２段保護用タイマー２３および３段保護用タイ
マー２４の限時動作Ｔｔとの大小関係にもとづき、２段
保護用タイマー２３および３段保護用タイマー２４の限
時動作後に、または電力動揺検出保持用タイマー３０の
限時復帰を待って、遮断指令出力用オア回路２６が遮断
指令を出力する。Further, even when a one-phase ground fault occurs in the protection section of the ground fault protection relay device (not shown), since the protection range of the short-circuit offset Mo relay 12 is wide, this short-circuit offset Mo relay 12 is present. Is activated, the power fluctuation detection device 2 outputs a high-potential “1” power fluctuation detection output to the prohibition input of the one-stage protection output prohibition circuit 17, and the cutoff command of the protection relay device 1 is unnecessarily blocked. It will be in a state of being. When a system fault of two or more phases continues following such a one-phase ground fault, the short-circuit offset moire relay 12 operates,
The shutoff command for shutting off the power system from the protective relay device 1 is the timed reset Tr of the oscillation detection and holding timer 30 and the timed operation Tt of the two-stage protection timer 23 and the three-stage protection timer 24, as in the above. Based on the magnitude relationship between the two-step protection timer 23 and the three-step protection timer 24, or after waiting for the time limit recovery of the power fluctuation detection and holding timer 30, the cut-off command output OR circuit 26 outputs the cut-off command. Is output.
【０００９】[0009]
【発明が解決しようとする課題】従来の系統電力動揺検
出装置２は以上のように構成されているので、電力動揺
検出中に系統事故が発生した場合、または遠方の系統事
故に引き続く保護区間内の系統事故が発生した場合、さ
らには１相地絡事故に引き続く２相以上の系統事故が発
生した場合などにあっては、動揺検出保持用タイマ３０
の限時復帰Ｔｒが２段保護用タイマー２３および３段保
護用タイマー２４の限時動作Ｔｔより小さい（Ｔｒ＜Ｔ
ｔ）と、電力動揺検出保持タイマー３０の限時復帰後で
ないと、保護継電装置２が遮断指令を出力できないとい
う問題が内在した。Since the conventional system power fluctuation detecting device 2 is constructed as described above, if a system accident occurs during power fluctuation detection, or within a protection section following a distant system accident. In the case where a system accident of 1) occurs, or when a system accident of 2 or more phases following the 1-phase ground fault occurs, the shaking detection and holding timer 30
Is smaller than the time limit operation Tt of the two-stage protection timer 23 and the three-stage protection timer 24 (Tr <T
There is an inherent problem that the protective relay device 2 cannot output the cutoff command unless the time t) and after the time limit reset of the power fluctuation detection hold timer 30.
【００１０】また、系統電力動揺において商用周波数が
変化する場合がある。この場合、地絡事故検出要素を構
成する零相過電流リレーなどの検出動作の設定の仕方に
よっては、系統電力動揺検出装置２が動作し、地絡保護
継電装置から不必要な遮断指令が出力されるという問題
もあった。Further, the commercial frequency may change due to system power fluctuation. In this case, depending on how the detection operation of the zero-phase overcurrent relay or the like that constitutes the ground fault accident detection element is set, the system power fluctuation detection device 2 operates and an unnecessary disconnection command is issued from the ground fault protection relay device. There was also a problem that it was output.
【００１１】この発明は上記のような課題を解決するた
めになされたものであり、第１の目的は電力系統の系統
電力動揺中に、系統電力動揺検出装置により保護継電装
置の遮断指令の出力が阻止された状態において、系統事
故が発生した場合に、動揺検出保持用タイマの限時復帰
と２段保護用タイマーおよび３段保護用タイマーの限時
動作との大小関係に左右されることなく、保護継電装置
の遮断指令出力に対する阻止を速やかに解除し、保護継
電装置が遮断指令を出力して電力系統を保護することで
ある。The present invention has been made to solve the above problems. A first object of the present invention is to issue a shutoff command for a protective relay device by a system power fluctuation detector during system power fluctuation of a power system. When a system accident occurs in a state where the output is blocked, regardless of the magnitude relation between the time limit return of the motion detection and holding timer and the time limit operation of the second stage protection timer and the third stage protection timer, The purpose is to promptly release the blocking of the output of the protection relay device for the interruption command, and the protection relay device outputs the interruption command to protect the power system.
【００１２】この発明の第２の目的は電力動揺検出リレ
ーだけが動作するような遠方事故後に、保護区間内事故
に進展した場合でも、動揺検出保持用タイマの限時復帰
と２段保護用タイマーおよび３段保護用タイマーの限時
動作との大小関係に左右されることなく、上記保護継電
装置の遮断指令出力に対する阻止を速やかに解除し、保
護継電装置が遮断指令を出力して電力系統を保護するこ
とである。A second object of the present invention is to provide a time limit return of the oscillation detection and holding timer and a two-stage protection timer even when the accident in the protection zone progresses after a distant accident in which only the power oscillation detection relay operates. Regardless of the magnitude relation with the time limit operation of the three-stage protection timer, the protection relay device immediately releases the blocking of the output of the interruption command, and the protection relay device outputs the interruption command to turn on the power system. To protect.
【００１３】この発明の第３の目的は１相地絡事故後
に、２相以上の事故に進展した場合でも、電力動揺検出
検出リレーの整定の大きさによらず、上記保護継電装置
の遮断指令出力に対する阻止を速やかに解除し、保護継
電装置が遮断指令を出力して電力系統を保護することで
ある。A third object of the present invention is to shut off the protective relay device regardless of the size of the settling of the power fluctuation detection and detection relay even when a two-phase or more accident progresses after the one-phase ground fault. The purpose is to promptly release the blocking for the command output, and the protection relay device outputs the cutoff command to protect the power system.
【００１４】この発明の第４の目的は電力系統の電力動
揺により商用周波数に変化が生じた場合においても、地
絡保護継電装置が不要な遮断指令を出力しないようにす
ることである。A fourth object of the present invention is to prevent the ground fault protection relay device from outputting an unnecessary shutoff command even when the commercial frequency changes due to power fluctuations in the power system.
【００１５】[0015]
【課題を解決するための手段】請求項１に記載した第１
の発明に係る電力動揺検出装置は、インピーダンス変化
率検出回路と事故検出タイマーと解除回路とを備えたも
のである。[Means for Solving the Problem] A first aspect described in claim 1.
The power fluctuation detection device according to the invention of claim 1 is provided with an impedance change rate detection circuit, an accident detection timer, and a release circuit.
【００１６】請求項２に記載した第２の発明に係る電力
動揺検出装置は、第１の発明のインピーダンス変化率検
出回路の出力が電力動揺検出出力を入力とする系統潮流
不動作用回路にて第１の発明の事故検出タイマーの入力
に接続されたものである。According to a second aspect of the present invention, there is provided a power fluctuation detecting device, wherein the output of the impedance change rate detecting circuit of the first invention is a system power flow non-operation circuit to which the power fluctuation detecting output is input. It is connected to the input of the accident detection timer of the first invention.
【００１７】請求項３に記載した第３の発明に係る電力
動揺検出装置は、第２の発明の系統潮流不動作用回路が
３入力の論理回路にて構成され、この論理回路の３入力
それぞれにはインピーダンス変化率検出回路の出力と電
力動揺検出出力と電力系統の過電流を検出する事故検出
回路の出力とを入力とする構成としたものである。According to a third aspect of the present invention, there is provided a power fluctuation detecting apparatus in which the system power flow non-operation circuit of the second aspect is composed of a 3-input logic circuit. Is a configuration in which the output of the impedance change rate detection circuit, the power fluctuation detection output, and the output of the accident detection circuit that detects an overcurrent in the power system are input.
【００１８】請求項４に記載した第４の発明に係る電力
動揺検出装置は、第１の発明のインピーダンス変化率検
出回路と事故検出タイマーおよび解除回路が電力系統の
相ごとに設けられたもである。According to a fourth aspect of the present invention, there is provided a power fluctuation detecting device, wherein the impedance change rate detection circuit, the accident detection timer and the release circuit of the first invention are provided for each phase of the power system. is there.
【００１９】請求項５に記載した第５の発明に係る電力
動揺検出装置は、第４の発明のインピーダンス変化率検
出回路が電力系統の線間および相ごとに設けられたもで
ある。According to a fifth aspect of the present invention, there is provided a power fluctuation detecting device in which the impedance change rate detecting circuit of the fourth invention is provided for each line and each phase of the power system.
【００２０】請求項６に記載した第６の発明に係る電力
動揺検出装置は、地絡１相検出回路を備え、この地絡１
相検出回路の検出出力にて電力系統の電力動揺を検出す
る電力動揺検出リレーの電力動揺検出出力を禁止する構
成としたものである。According to a sixth aspect of the present invention, there is provided a power fluctuation detecting apparatus including a ground fault 1-phase detecting circuit.
The configuration is such that the power fluctuation detection relay for detecting the power fluctuation of the power system is prohibited by the detection output of the phase detection circuit.
【００２１】[0021]
【作用】第１の発明の電力動揺検出装置は、インピーダ
ンス変化率検出回路が電力系統のインピーダンスの変化
が一定値以下であることを検出し、このインピーダンス
変化率検出回路の検出動作が事故検出タイマーに設定さ
れた一定時間以上継続すると、解除回路が保護継電装置
への遮断指令出力阻止を解除する。In the power fluctuation detecting device of the first aspect of the invention, the impedance change rate detecting circuit detects that the change in the impedance of the power system is less than a certain value, and the detecting operation of the impedance change rate detecting circuit is an accident detection timer. When it continues for a certain period of time or more set to, the release circuit releases the blocking command output blocking to the protective relay device.
【００２２】第２の発明の電力動揺検出装置は、インピ
ーダンス変化率検出回路の出力を受けた系統潮流不動作
用回路が電力動揺検出出力を入力として事故検出タイマ
ーを不要に起動しない。In the power fluctuation detecting apparatus of the second invention, the system power flow non-operation circuit which receives the output of the impedance change rate detecting circuit does not start the accident detection timer unnecessarily with the power fluctuation detecting output as an input.
【００２３】第３の発明の電力動揺検出装置は、インピ
ーダンス変化率検出回路の出力を受けた系統潮流不動作
用回路が電力動揺検出出力または電力系統の事故時の過
電流検出出力を入力として事故検出タイマーを不要に起
動しない。In the power fluctuation detecting apparatus of the third invention, the system power flow non-operation circuit which receives the output of the impedance change rate detecting circuit receives the power fluctuation detection output or the overcurrent detection output at the time of the power system accident as an input to detect the accident. Do not start the timer unnecessarily.
【００２４】第４の発明の電力動揺検出装置は、電力系
統の相ごとに設けられたインピーダンス変化率検出回路
が電力系統の電力動揺時に商用周波数が変化した場合で
も地絡保護継電装置が遮断指令を不要に出力しないよう
に阻止する。In the power fluctuation detecting device of the fourth invention, the impedance change rate detecting circuit provided for each phase of the power system shuts off the ground fault protection relay device even when the commercial frequency changes during power fluctuation of the power system. Prevents commands from being output unnecessarily.
【００２５】第５の発明の電力動揺検出装置は、電力系
統の線間および相ごとに設けられたインピーダンス変化
率検出回路が電力系統の電力動揺時に商用周波数が変化
した場合でも地絡保護継電装置が遮断指令を不要に出力
しないように阻止する。In the power fluctuation detecting device of the fifth aspect of the invention, the impedance change rate detecting circuit provided for each line and each phase of the power system protects against the ground fault even when the commercial frequency changes during the power fluctuation of the power system. Prevents the device from outputting a shutoff command unnecessarily.
【００２６】第６の発明の電力動揺検出装置は、地絡１
相検出回路が１相地絡事故に引き続き２相以上の事故に
進展した場合に電力動揺検出リレーの電力動揺検出出力
を禁止する。The power fluctuation detecting apparatus of the sixth invention comprises a ground fault 1
When the phase detection circuit progresses to a two-phase or more accident following the one-phase ground fault accident, the power fluctuation detection output of the power fluctuation detection relay is prohibited.
【００２７】[0027]
【実施例】以下、この発明の各実施例を図１乃至図１１
を用い上記従来例と同一部分に同一符号を付して説明す
る。 実施例１（請求項１に対応）．図１はこの発明の実施例
１としての電力系統の保護継電装置を含む電力動揺検出
装置を示す構成図である。図１において、保護継電装置
１は短絡１段モーリレー３乃至５と短絡２段モーリレー
６乃至８と短絡３段モーリレー９乃至１１とアンド回路
１３乃至１５と１段出力用オア回路１６と１段保護出力
用禁止回路１７とアンド回路１８乃至２０と２段出力用
オア回路２１と３段出力用オア回路２２と限時動作回路
を構成する２段保護用タイマー２３と限時動作回路を構
成する３段保護用タイマー２４と２段保護出力用アンド
回路２５と遮断指令出力用オア回路２６とを備えてい
る。電力動揺検出装置２は短絡オフセットモーリレー１
２と３段保護出力用オア回路２７と禁止回路２８と限時
動作回路を構成する電力動揺検出用タイマー２９と限時
動作・限時復帰回路を構成する電力動揺検出保持用タイ
マー３０と電力動揺検出出力用オア回路３１とインピー
ダンスリレー３２と事故検出タイマー３３と解除回路３
４とを備えている。インピーダンスリレー３２は電力系
統の電流および電圧によるインピーダンスの変化率を検
出し、その変化率（変化幅）が一定値以下であれば動作
するインピーダンス変化率検出回路を構成している。事
故検出タイマー３３はインピーダンスリレー３２の出力
に接続され、解除回路３４は事故検出タイマー３３の出
力を禁止入力とするとともに電力動揺検出出力用オア回
路３１の出力を入力とする禁止回路になっており、この
解除回路３４の出力が保護継電器１の１段保護出力用禁
止回路１７の禁止入力に入力されている。上記インピー
ダンスリレー３２は、具体的には、 ｜Ｒ（ｔ）−Ｒ（ｔ−１８０）｜＜０．５Ω ………（１） ｜Ｘ（ｔ）−Ｘ（ｔ−１８０）｜＜０．５Ω ………（２） の両式が成立するとき、動作する。上記式において、Ｒ
（ｔ）、Ｘ（ｔ）はインピーダンスの抵抗分とリアクタ
ンス分を各々示し、Ｒ（ｔ−１８０）、Ｘ（ｔ−１８
０）は半サイクル前のデータを示す。よって、図３にお
いて、例えば、Ｆ３＝１０Ω、Ｆ４＝２Ωとすれば、
（１）式が不成立、（２）が成立、したがって、インピ
ーダンスリレー３２は不動作となる。また、Ｆ３＝１０
Ω、Ｆ４＝９．６Ωとすれば、（１）式と（２）とが共
に成立、したがって、インピーダンスリレー３２は動作
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, each embodiment of the present invention will be described with reference to FIGS.
In the following description, the same parts as those in the above-mentioned conventional example are designated by the same reference numerals. Example 1 (corresponding to claim 1). 1 is a configuration diagram showing a power fluctuation detecting device including a protective relay device of a power system as a first embodiment of the present invention. In FIG. 1, the protective relay device 1 includes a short-circuit 1-stage Mo relay 3 to 5, a short-circuit 2 stage Mo relay 6 to 8, a short-circuit 3 stage Mo relay 9 to 11, an AND circuit 13 to 15, a 1-stage output OR circuit 16 and 1-stage. Protection output prohibiting circuit 17, AND circuits 18 to 20, two-stage output OR circuit 21, three-stage output OR circuit 22, two-stage protection timer 23 forming a time-limit operation circuit, and three-stage forming time-limit operation circuit A protection timer 24, a two-stage protection output AND circuit 25, and a shutoff command output OR circuit 26 are provided. The power fluctuation detector 2 is a short-circuit offset mode relay 1.
Two or three-stage protection output OR circuit 27, prohibition circuit 28, power fluctuation detection timer 29 that constitutes the time delay operation circuit, power fluctuation detection holding timer 30 that configures the time delay operation / time delay recovery circuit, and power fluctuation detection output OR circuit 31, impedance relay 32, accident detection timer 33, and release circuit 3
4 and. Impedance relay 32 constitutes an impedance change rate detection circuit that detects the rate of change of impedance due to current and voltage of the power system, and operates if the rate of change (change width) is a certain value or less. The accident detection timer 33 is connected to the output of the impedance relay 32, and the release circuit 34 serves as a prohibition circuit that receives the output of the accident detection timer 33 as a prohibition input and the power oscillation detection output OR circuit 31 as an input. The output of the release circuit 34 is input to the inhibition input of the one-stage protection output inhibition circuit 17 of the protection relay 1. Specifically, the impedance relay 32 has: | R (t) -R (t-180) | <0.5Ω ... (1) | X (t) -X (t-180) | <0. 5Ω ............ Operates when both equations (2) are satisfied. In the above formula, R
(T) and X (t) represent the resistance component and the reactance component of the impedance, respectively, and R (t-180), X (t-18)
0) shows the data before half cycle. Therefore, in FIG. 3, for example, if F3 = 10Ω and F4 = 2Ω,
The equation (1) is not satisfied, and the equation (2) is satisfied, so that the impedance relay 32 does not operate. Also, F3 = 10
If Ω and F4 = 9.6Ω, both equations (1) and (2) are established, and therefore the impedance relay 32 operates.
【００２８】次に実施例１の動作について図２を参照し
つつ説明する。電力系統において電力動揺が発生する
と、電流の変化および電圧の変化は系統事故時のそれよ
りも緩慢に変化し、図２に示すようなインピーダンス軌
跡をたどる。この動揺時のインピーダンス軌跡によれ
ば、時刻ｔ１において短絡オフセットモーリレー１２が
動作した後、時刻ｔ２において短絡モーリレー９乃至１
１が動作する。この動作時刻ｔ１と動作時刻ｔ２との間
の時間差ｔ１−ｔ２が電力動揺検出用タイマー２９の限
時動作値以上であれば、前記従来例と同様に、電力系統
に電力動揺が発生しているとみなし、電力動揺検出装置
２が高電位の「１」なる電力動揺検出出力を１段保護出
力用禁止回路１７の禁止入力に出力することによって、
保護継電装置１が遮断指令を不要に出力するのを、電力
動揺検出装置２があらかじめ阻止する。また、図２に示
す動揺時のインピーダンス軌跡が短絡モーリレー９乃至
１１の保護範囲内から短絡オフセットモーリレー１２の
保護範囲外に移動した場合も、前記従来例と同様に、電
力動揺検出装置２が動揺検出保持用タイマ３０の限時復
帰後に低電位の「０」なる電力動揺検出出力を１段保護
出力用禁止回路１７の禁止入力に出力することによっ
て、保護継電装置１が遮断指令を出力し得る状態に復帰
する。Next, the operation of the first embodiment will be described with reference to FIG. When the power fluctuation occurs in the power system, the change in the current and the change in the voltage change more slowly than those at the time of the system failure, and follow the impedance locus as shown in FIG. According to the impedance locus at the time of the sway, after the short circuit offset Mohre relay 12 operates at the time t1, the short circuit Mohre relays 9 to 1 at the time t2.
1 works. If the time difference t1−t2 between the operation time t1 and the operation time t2 is equal to or greater than the time limit operation value of the power fluctuation detection timer 29, it is determined that power fluctuation has occurred in the power system as in the conventional example. Assuming that the power fluctuation detection device 2 outputs the power fluctuation detection output of high potential “1” to the prohibition input of the one-stage protection output prohibition circuit 17,
The power fluctuation detection device 2 blocks in advance the protection relay device 1 from outputting an interruption command unnecessarily. Also, when the impedance locus during oscillation shown in FIG. 2 moves from within the protection range of the short circuit mode relays 9 to 11 to outside the protection range of the short circuit offset mode relay 12, the power fluctuation detection device 2 operates in the same manner as the conventional example. The protection relay device 1 outputs a cutoff command by outputting a power fluctuation detection output of low potential “0” after the time limit recovery of the vibration detection and holding timer 30 to the prohibition input of the one-stage protection output prohibition circuit 17. Return to the earned state.
【００２９】一方、電力動揺検出中において短絡モーリ
レー９乃至１１の保護範囲内に系統事故が発生すると、
それまで緩慢に変化していたインピーダンスの軌跡は、
図２に示すような事故点Ｆ１に移動する。事故点Ｆ１の
インピーダンスはほぼ一定した値となるため、インピー
ダンスリレー３２がその系統事故を検出し、検出タイマ
ー３３が一定時間後に限時動作し、オア回路３１による
保護継電装置１への高電位の「１」なる電力動揺検出出
力がアンド回路３４により解除される。結果として、動
作検出保持用タイマー３０の限時復帰と２段保護用タイ
マー２３および３段保護用タイマー２４の限時動作との
大小に関係なく、２段保護用タイマー２３および３段保
護用タイマー２４の限時動作後に、または、動作検出保
持用タイマー３０の限時復帰を待つことなく、遮断指令
出力用オア回路２６が遮断指令を出力する。On the other hand, if a system accident occurs within the protection range of the short circuit relays 9 to 11 during power fluctuation detection,
The locus of impedance, which had been changing slowly until then, was
It moves to the accident point F1 as shown in FIG. Since the impedance at the fault point F1 has a substantially constant value, the impedance relay 32 detects the system fault, the detection timer 33 operates for a fixed time after a certain time, and the OR circuit 31 causes a high potential to the protective relay device 1. The power fluctuation detection output of "1" is released by the AND circuit 34. As a result, the two-step protection timer 23 and the three-step protection timer 24 are protected regardless of the magnitude of the time limit return of the operation detection holding timer 30 and the time-limit operation of the two-step protection timer 23 and the three-step protection timer 24. After the time delay operation or without waiting for the time detection reset of the operation detection and holding timer 30, the shutoff command output OR circuit 26 outputs the shutoff command.
【００３０】また、短絡オフセットモーリレー１２が動
作し、短絡モーリレー９乃至１１が不動作となる図２に
符号Ｆ２で示す遠方の系統事故に引き続き、短絡モーリ
レー９乃至１１の保護区間内に符号Ｆ１で示す系統事故
が発生した場合には、上記と同様に、インピーダンスリ
レー３２がその系統事故Ｆ１を検出することにより、検
出タイマー３３が限時動作し、この限時動作による一定
の遅れ時間後に、検出タイマー３３が高電位の「１」を
アンド回路３４の禁止入力に出力し、このアンド回路３
４が動作検出出力用オア回路３１による保護継電装置１
への高電位の「１」なる電力動揺検出出力を解除し、動
作検出保持用タイマー３０の限時復帰と２段保護用タイ
マー２３および３段保護用タイマー２４の限時動作との
大小に関係なく、２段保護用タイマー２３および３段保
護用タイマー２４の限時動作後に、または、動作検出保
持用タイマー３０の限時復帰を待つことなく、遮断指令
出力用オア回路２６が遮断指令を出力する。Further, following the distant system fault indicated by the reference symbol F2 in FIG. 2 in which the short-circuit offset relay 12 operates and the short-circuit relays 9 to 11 do not operate, the reference symbol F1 is set in the protection section of the short-circuit relays 9 to 11. When a system fault indicated by (4) occurs, the impedance relay 32 detects the system fault F1 in the same manner as described above, so that the detection timer 33 operates for a time limit. After a certain delay time due to this time delay operation, the detection timer 33 outputs a high potential "1" to the prohibition input of the AND circuit 34, and the AND circuit 3
4 is a protective relay device 1 by an OR circuit 31 for operation detection output
Irrespective of the magnitude of the power fluctuation detection output of the high potential “1” to the, the time detection return of the operation detection holding timer 30 and the time delay operation of the second stage protection timer 23 and the third stage protection timer 24. The cutoff command output OR circuit 26 outputs a cutoff command after the time limit operation of the two-step protection timer 23 and the three-step protection timer 24 or without waiting for the time detection return of the operation detection holding timer 30.
【００３１】さらに、図外の地絡保護装置の保護区間内
の１相地絡事故が発生した場合でも、短絡オフセットモ
ーリレー１２の保護範囲が広いために、この短絡オフセ
ットモーリレー１２が動作し、系統電力動作検出装置２
が高電位の「１」なる系統動作検出出力を１段保護出力
用禁止回路１７の禁止入力に出力し、保護継電装置１の
遮断指令が不要に阻止される。このような１相地絡事故
に引き続き２相以上の系統事故が発生した場合、上記と
同様に、インピーダンスリレー３２が上記系統事故を検
出することにより、アンド回路３４が動作検出出力用オ
ア回路３１による保護継電装置１への阻止信号を解除す
るので、遮断指令出力用オア回路２６が遮断指令を出力
する。Further, even if a one-phase ground fault accident occurs in the protection section of the ground fault protection device (not shown), the short-circuit offset mode relay 12 operates because the protection range of the short-circuit offset mode relay 12 is wide. , System power operation detection device 2
Outputs a system operation detection output having a high potential of "1" to the prohibition input of the one-stage protection output prohibition circuit 17, and the cutoff command of the protection relay device 1 is unnecessarily blocked. When a system fault of two or more phases continues after such a one-phase ground fault, the AND circuit 34 detects the system fault and the AND circuit 34 causes the operation detection output OR circuit 31 to operate in the same manner as described above. Since the blocking signal to the protective relay device 1 due to is released, the shutoff command output OR circuit 26 outputs a shutoff command.
【００３２】実施例２（請求項２に対応）．図４はこの
発明の実施例２としての電力系統の保護継電装置を含む
電力動揺検出装置を示す構成図である。図４において、
この実施例２は上記実施例１のインピーダンスリレー３
２（図中には記号ΔＲＸを付してある）と検出タイマー
３３との間に系統潮流不動作用アンド回路３５を挿入
し、この系統潮流不動作用アンド回路３５にインピーダ
ンスリレー３２の出力と電力動揺検出出力用オア回路３
１の出力とを入力し、この系統潮流不動作用アンド回路
３５の出力を検出タイマー３３に入力した点に特徴があ
る。Embodiment 2 (corresponding to claim 2). Second Embodiment FIG. 4 is a configuration diagram showing a power fluctuation detecting device including a power system protection relay device according to a second embodiment of the present invention. In FIG.
The second embodiment is the impedance relay 3 of the first embodiment.
2 (denoted by symbol ΔRX in the figure) and the detection timer 33 are inserted with a system power flow non-operation AND circuit 35, and the output of the impedance relay 32 and the power fluctuation are inserted into the system power flow non-operation AND circuit 35. Detection output OR circuit 3
1 is input, and the output of the system power flow non-operation AND circuit 35 is input to the detection timer 33.
【００３３】したがって、この実施例２によれば、系統
潮流不動作用アンド回路３５が電力動揺検出出力用オア
回路３１の出力とインピーダンスリレー３２の出力とを
起動条件とするので、電力系統の潮流状態において、検
出タイマー３３が動作することがなくなるため、電力系
統に電力動揺が発生した場合、電力動揺検出装置２がそ
の電力動揺を速やかに検出し、実施例１の動作に加え、
保護継電装置１の遮断指令が出力されるを阻止すること
ができる。具体的には、電力系統は、通常、その電圧お
よび電流をほぼ一定とするように潮流が流れるため、イ
ンピーダンスの値が或る一定値以下で動作するインピー
ダンスリレー３２は動作状態となっている。したがっ
て、系統潮流不動作用アンド回路３５がない場合は、解
除回路３４から出力される電力動揺検出出力が阻止され
た状態となるので、電力動揺が発生した場合、インピー
ダンスリレー３２の復帰時間だけ遅れて電力動揺検出出
力が動作し、保護継電装置１の遮断指令への阻止が遅れ
る可能性がある。このことから、電力系統が正常であれ
ば、系統潮流不動作用アンド回路３５が電力動揺検出出
力を阻止しないように動作し、結果として、電力動揺検
出装置２がその電力動揺を速やかに検出して保護継電装
置１の遮断指令が出力されるを阻止することができる。Therefore, according to the second embodiment, since the grid power flow non-operation AND circuit 35 sets the output of the power fluctuation detection output OR circuit 31 and the output of the impedance relay 32 as the starting conditions, the power grid power flow state. In the above, since the detection timer 33 does not operate, when power fluctuation occurs in the power system, the power fluctuation detection device 2 promptly detects the power fluctuation, and in addition to the operation of the first embodiment,
It is possible to prevent the shutdown command of the protective relay device 1 from being output. Specifically, in the electric power system, a tidal current normally flows so that its voltage and current are substantially constant, so that the impedance relay 32 that operates at an impedance value of a certain fixed value or less is in an operating state. Therefore, when the power flow inactivation AND circuit 35 does not exist, the power fluctuation detection output output from the canceling circuit 34 is blocked. Therefore, when the power fluctuation occurs, the impedance relay 32 is delayed by the recovery time. There is a possibility that the power fluctuation detection output operates and that the blocking of the protection relay device 1 to the shutoff command is delayed. From this, if the power system is normal, the system power flow non-operation AND circuit 35 operates so as not to block the power fluctuation detection output, and as a result, the power fluctuation detection device 2 quickly detects the power fluctuation. It is possible to prevent the shutdown command of the protective relay device 1 from being output.
【００３４】実施例３（請求項３に対応）．図５はこの
発明の実施例３としての電力系統の保護継電装置を含む
電力動揺検出装置を示す構成図である。図５において、
この実施例３は上記実施例２の系統潮流不動作用アンド
回路３５を３入力の素子構成とするとともに、過電流検
出リレーなどのような事故検出回路３６を設け、この事
故検出回路３６の出力をアンド回路３５の増加分の入力
に接続した点に特徴がある。Embodiment 3 (corresponding to claim 3). FIG. 5 is a configuration diagram showing a power fluctuation detecting device including a power system protection relay device according to a third embodiment of the present invention. In FIG.
In the third embodiment, the AND circuit 35 for system power flow non-operation of the second embodiment has a three-input element structure, and an accident detection circuit 36 such as an overcurrent detection relay is provided and the output of the accident detection circuit 36 is provided. It is characterized in that it is connected to the increased input of the AND circuit 35.
【００３５】したがって、この実施例３によれば、事故
検出回路３６が一定の系統事故電流値以上あるいは一定
の系統電圧値以下で動作するので、電力動揺検出装置２
が不要に不動作状態となることなく、電力系統に電力動
揺が発生した場合、電力動揺検出装置２がその電力動揺
を速やかに検出し、実施例２の動作に加え、保護継電装
置１の遮断指令が出力されるのを阻止することができ
る。Therefore, according to the third embodiment, since the fault detection circuit 36 operates at a constant system fault current value or more or at a constant system voltage value or less, the power fluctuation detecting device 2
When the power fluctuation occurs in the power system without causing an unnecessary operation, the power fluctuation detection device 2 promptly detects the power fluctuation, and in addition to the operation of the second embodiment, It is possible to prevent the cutoff command from being output.
【００３６】実施例４（請求項４に対応）．図６はこの
発明の実施例４としての電力動揺検出装置を示す構成
図、図７はこの実施例４の動作を説明するためのタイミ
ングチャートである。図６において、この実施例４は上
記実施例２のインピーダンスリレー３２を地絡第１相イ
ンピーダンスリレー５１（図中には記号ΔＲＸＧ−１を
付してある）と地絡第２相インピーダンスリレー５２
（図中には記号ΔＲＸＧ−２を付してある）と地絡第３
相インピーダンスリレー５３（図中には記号ΔＲＸＧ−
３を付してある）とで構成し、上記実施例２の系統潮流
不動作用アンド回路３５を地絡第１相アンド回路５４と
地絡第２相アンド回路５５と地絡第３相アンド回路５６
とで構成し、これら地絡第１相・地絡第２相・地絡第３
相アンド回路５４乃至５６の１つの入力に電力動揺検出
出力用オア回路３１の出力を入力し、地絡第１相・地絡
第２相・地絡第３相アンド回路５４乃至５６のもう１つ
の入力それぞれに地絡第１相・地絡第２相・地絡第３相
インピーダンスリレー５１乃至５３の出力を個別に入力
し、上記実施例２の事故検出タイマー３３を地絡第１相
事故検出タイマー６６と地絡第２相事故検出タイマー６
７と地絡第３相検出タイマー６８と短絡事故検出タイマ
ー６９とで構成し、上記実施例２の解除回路３３を地絡
第１相解除回路７０と地絡第２相解除回路７１と地絡第
３相解除回路７２と短絡解除回路７３とで構成する一
方、地絡第１相・地絡第２相・地絡第３相アンド回路５
４乃至５６の出力を入力とするアンド回路５７と、地絡
第１相・地絡第２相アンド回路５４，５５の出力を入力
とするアンド回路５８と、地絡第２相・地絡第３相アン
ド回路５５，５６の出力を入力とするアンド回路５９
と、地絡第１相・地絡第３相アンド回路５４，５６の出
力を入力とするアンド回路６０と、これらアンド回路５
８乃至６０の出力を入力とするオア回路６１と、このオ
ア回路６１の出力を入力とするとともにアンド回路５７
の出力を禁止入力とする禁止回路６２と、この禁止回路
６２の出力を禁止入力とするとともに地絡第１相・地絡
第２相・地絡第３相アンド回路５４乃至５６の出力を入
力とする禁止回路６３乃至６５とを備え、これら禁止回
路６３乃至６５の出力それぞれが地絡第１相・地絡第２
相・地絡第３相検出タイマー６６乃至６８に個別に接続
され、オア回路６１の出力が短絡事故検出タイマー６９
に接続され、この短絡事故検出タイマー６９の出力が短
絡解除回路７３の禁止入力に接続され、この短絡解除回
路７３の入力に電力動揺検出出力用オア回路３１の出力
が接続されている。Embodiment 4 (corresponding to claim 4). 6 is a block diagram showing a power fluctuation detecting device as a fourth embodiment of the present invention, and FIG. 7 is a timing chart for explaining the operation of the fourth embodiment. In FIG. 6, in the fourth embodiment, the impedance relay 32 of the second embodiment is replaced by a ground fault first phase impedance relay 51 (denoted by a symbol ΔRXG-1 in the drawing) and a ground fault second phase impedance relay 52.
(The symbol ΔRXG-2 is attached in the figure) and the ground fault No. 3
Phase impedance relay 53 (in the figure, symbol ΔRXG-
3) is added, and the AND circuit 35 for system power flow non-operation of the above-described second embodiment is used as a ground fault first phase AND circuit 54, a ground fault second phase AND circuit 55, and a ground fault third phase AND circuit. 56
And a ground fault 1st phase / ground fault 2nd phase / ground fault 3rd
The output of the power oscillation detection output OR circuit 31 is input to one input of the phase AND circuits 54 to 56, and the other of the ground fault first phase / ground fault second phase / ground fault third phase AND circuits 54 to 56 is input. The outputs of the ground fault first phase / ground fault second phase / ground fault third phase impedance relays 51 to 53 are individually input to each of the two inputs, and the fault detection timer 33 of the second embodiment is set to the ground fault first phase fault. Detection timer 66 and ground fault second phase accident detection timer 6
7, a ground fault third phase detection timer 68, and a short-circuit accident detection timer 69. The release circuit 33 of the second embodiment is used as a ground fault first phase release circuit 70, a ground fault second phase release circuit 71, and a ground fault. The third-phase canceling circuit 72 and the short-circuit canceling circuit 73 are provided, while the ground fault first phase / ground fault second phase / ground fault third phase AND circuit 5
AND circuit 57 which receives the outputs of 4 to 56, an AND circuit 58 which receives the outputs of the ground fault first phase / ground fault second phase AND circuits 54 and 55, and a ground fault second phase / ground fault first An AND circuit 59 which receives the outputs of the three-phase AND circuits 55 and 56
An AND circuit 60 that receives the outputs of the ground fault first phase / ground fault third phase AND circuits 54 and 56, and these AND circuits 5
An OR circuit 61 which receives the outputs of 8 to 60, and an AND circuit 57 which receives the output of the OR circuit 61
And the output of the ground fault first phase / ground fault second phase / ground fault third phase AND circuits 54 to 56 are input. And prohibiting circuits 63 to 65, and outputs of the prohibiting circuits 63 to 65 are ground fault first phase / ground fault second
The phase / ground fault third phase detection timers 66 to 68 are individually connected, and the output of the OR circuit 61 is short-circuit accident detection timer 69.
The output of the short circuit accident detection timer 69 is connected to the inhibit input of the short circuit release circuit 73, and the output of the power fluctuation detection output OR circuit 31 is connected to the input of the short circuit release circuit 73.
【００３７】したがって、この実施例４によれば、地絡
第１相・地絡第２相・地絡第３相検出出力および短絡検
出出力を個別に出力するように構成したので、電力系統
の電力動揺において、商用周波数が変化した場合でも、
上記実施例１の動作に加え、地絡保護継電装置からの不
要な遮断指令を阻止することができる。具体的には、１
相地絡事故が発生した場合、図７のＡ図に示すように、
地絡第１相・地絡第２相・地絡第３相インピーダンスリ
レー５１乃至５３のうちの事故相に対応した１要素が動
作し、アンド回路５７乃至６０とオア回路６１および禁
止回路６２が不動作となり、アンド回路６３乃至６５の
うちの１回路のみ動作する。また、２相地絡事故が発生
した場合、図７のＢ図に示すように、地絡第１相・地絡
第２相・地絡第３相インピーダンスリレー５１乃至５３
のうちの事故相に対応した２要素が動作し、アンド回路
５８乃至６０およびオア回路６１が動作し、アンド回路
５７が不動作となり、禁止回路６２が動作し、アンド回
路６３乃至６５が不動作となる。さらに、３相地絡事故
が発生した場合、図７のＣ図に示すように、地絡第１相
・地絡第２相・地絡第３相インピーダンスリレー５１乃
至５３の全要素が動作し、アンド回路５７乃至６０およ
びオア回路６１が動作し、禁止回路６２が不動作とな
り、アンド回路６３乃至６５が動作する。結果として、
電力系統の電力動揺において、商用周波数が変化した場
合でも、地絡保護継電装置からの不要な遮断指令を阻止
することができる。Therefore, according to the fourth embodiment, the ground fault first phase / ground fault second phase / ground fault third phase detection output and the short circuit detection output are individually output. Even if the commercial frequency changes due to power fluctuations,
In addition to the operation of the first embodiment, it is possible to prevent an unnecessary shutoff command from the ground fault protection relay device. Specifically, 1
When a phase-to-ground fault occurs, as shown in Fig. 7A,
One of the ground fault first phase / ground fault second phase / ground fault third phase impedance relays 51 to 53 corresponding to the fault phase operates, and the AND circuits 57 to 60, the OR circuit 61, and the prohibition circuit 62 operate. It becomes inoperative and only one of the AND circuits 63 to 65 operates. When a two-phase ground fault accident occurs, as shown in FIG. 7B, the ground fault first phase / ground fault second phase / ground fault third phase impedance relays 51 to 53.
2 elements corresponding to the accident phase among the two operate, the AND circuits 58 to 60 and the OR circuit 61 operate, the AND circuit 57 does not operate, the prohibition circuit 62 operates, and the AND circuits 63 to 65 do not operate. Becomes Further, when a three-phase ground fault accident occurs, all the elements of the ground fault first phase / ground fault second phase / ground fault third phase impedance relays 51 to 53 are activated, as shown in FIG. 7C. The AND circuits 57 to 60 and the OR circuit 61 operate, the prohibition circuit 62 does not operate, and the AND circuits 63 to 65 operate. as a result,
In the power fluctuation of the power system, even if the commercial frequency changes, it is possible to prevent an unnecessary cutoff command from the ground fault protection relay device.
【００３８】実施例５（請求項５に対応）．図８はこの
発明の実施例５としての電力動揺検出装置を示す構成図
である。図８において、この実施例５は上記実施例４の
インピーダンスリレー３２を地絡第１相・地絡第２相・
地絡第３相インピーダンスリレー５１乃至５３に加え短
絡第１相インピーダンスリレー（図中には記号ΔＲＸＳ
−１を付してある）８１と短絡第２相インピーダンスリ
レー（図中には記号ΔＲＸＳ−２を付してある）８２と
短絡第３相インピーダンスリレー（図中には記号ΔＲＸ
Ｓ−３を付してある）８３とで構成し、上記実施例５の
系統潮流不動作用アンド回路３５を地絡第１相・地絡第
２相・地絡第３相アンド回路５４乃至５６に加え短絡第
１相・短絡第２相・短絡第３相アンド回路８４乃至８６
とで構成し、上記実施例５の事故検出タイマー３３を地
絡第１相・地絡第２相・地絡第３相検出タイマー６６乃
至６８に加え短絡第１相・短絡第２相・短絡第３相事故
検出タイマー８７乃至８９とで構成した点に特徴があ
る。なお、この実施例５においても、上記実施例４と同
様に、解除回路３３は地絡第１相解除回路７０と地絡第
２相解除回路７１と地絡第３相解除回路７２と短絡解除
回路７３とで構成されている。Embodiment 5 (corresponding to claim 5). FIG. 8 is a configuration diagram showing a power fluctuation detecting device as a fifth embodiment of the present invention. In FIG. 8, in the fifth embodiment, the impedance relay 32 of the fourth embodiment is connected to the ground fault first phase / ground fault second phase.
In addition to the ground fault third phase impedance relays 51 to 53, a short circuit first phase impedance relay (in the figure, symbol ΔRXS
-1) 81 and short-circuited second phase impedance relay (denoted by symbol ΔRXS-2 in the figure) 82 and short-circuited third phase impedance relay (symbol ΔRX in the figure)
S3) 83) and the system power flow non-operation AND circuit 35 of the fifth embodiment described above, and the ground fault first phase / ground fault second phase / ground fault third phase AND circuits 54 to 56. In addition to short circuit 1st phase / short circuit 2nd phase / short circuit 3rd phase AND circuit 84 to 86
In addition to the ground fault first phase / ground fault second phase / ground fault third phase detection timers 66 to 68, the fault detection timer 33 of the fifth embodiment is short-circuited first-phase / short-circuited second-phase / short-circuited. It is characterized in that it is composed of the third phase accident detection timers 87 to 89. In the fifth embodiment, as in the fourth embodiment, the canceling circuit 33 includes the ground fault first phase canceling circuit 70, the ground fault second phase canceling circuit 71, the ground fault third phase canceling circuit 72, and the short circuit canceling. And a circuit 73.
【００３９】したがって、この実施例５によれば、上記
実施例４に比べて、インピーダンスリレーおよび事故検
出タイマーを全相ごとに設けたので、論理回路構成を簡
素にしつつ、電力系統の電力動揺において、商用周波数
が変化した場合でも、地絡保護継電装置からの不要な遮
断指令を阻止することができる。Therefore, according to the fifth embodiment, as compared with the fourth embodiment, the impedance relay and the accident detection timer are provided for each phase, so that the logic circuit configuration is simplified and the power fluctuation of the power system is prevented. Even if the commercial frequency changes, it is possible to prevent an unnecessary cutoff command from the ground fault protection relay device.
【００４０】実施例６（請求項５に対応）．図９はこの
発明の実施例６としての電力動揺検出装置を示す構成図
である。この実施例６は図９に示すように、上記実施例
５における短絡解除回路７３を短絡第１相・短絡第２相
・短絡第３相解除回路９１乃至９３で構成し、短絡事故
検出出力を各相ごとに出力するようにしたものである。Embodiment 6 (corresponding to claim 5). FIG. 9 is a configuration diagram showing a power fluctuation detecting device as a sixth embodiment of the present invention. In the sixth embodiment, as shown in FIG. 9, the short circuit canceling circuit 73 in the fifth embodiment is constituted by short circuiting first phase / short circuiting second phase / short circuiting third phase canceling circuits 91 to 93, and a short circuit accident detection output is generated. The output is made for each phase.
【００４１】なお、図６、図８および図９では、図面を
簡明にするために、短絡および地絡保護継電器の図は省
略してある。In FIG. 6, FIG. 8 and FIG. 9, the short-circuit and ground fault protection relays are omitted for the sake of simplicity.
【００４２】実施例７（請求項６に対応）．図１０はこ
の発明の実施例７としての電力系統の保護継電装置を含
む電力動揺検出装置を示す構成図、図１１はこの実施例
７の動作を説明するためのタイミングチャートである。
図１０において、この実施例７は上記実施例１の禁止回
路２８を２つの禁止入力を有する３入力の素子構成とす
るとともに、この禁止回路２８の１つの禁止入力に地絡
１相検出回路４７の出力を入力する点に特徴がある。こ
の地絡１相検出回路４７は、地絡３段モーリレー３７，
３８，３９（図中には記号、４４Ｇ−１Ｄ、４４Ｇ−２
Ｄ、４４Ｇ−３Ｄを付してある）と、この地絡３段モー
リレー３７乃至３９の出力を入力とするオア回路４０
と、地絡３段モーリレー３７，３８の出力を入力とする
アンド回路４１と、地絡３段モーリレー３８，３９の出
力を入力とするアンド回路４２と、地絡３段モーリレー
３７，３９の出力を入力とするアンド回路４３と、これ
らのアンド回路４１乃至４３の出力を入力とするオア回
路４４と、このオア回路４４の出力およびオア回路４０
の出力を入力とするアンド回路４５と、このアンド回路
４５の出力を入力とする限時動作回路を構成する地絡１
相検出用タイマー４６とで構成され、この地絡１相検出
用タイマー４６の出力が禁止回路２８の禁止入力に接続
されている。Embodiment 7 (corresponding to claim 6). FIG. 10 is a configuration diagram showing a power fluctuation detecting device including a power system protection relay device as a seventh embodiment of the present invention, and FIG. 11 is a timing chart for explaining the operation of the seventh embodiment.
10, in the seventh embodiment, the prohibition circuit 28 of the first embodiment has a three-input element structure having two prohibition inputs, and one prohibition input of the prohibition circuit 28 has a ground fault one-phase detection circuit 47. The feature is that the output of is input. The ground fault 1-phase detection circuit 47 includes a ground fault 3-stage moh relay 37,
38, 39 (in the figure, symbols, 44G-1D, 44G-2
D, 44G-3D), and an OR circuit 40 that receives the outputs of the ground fault three-stage mohre relays 37 to 39 as inputs.
And an AND circuit 41 that receives the outputs of the ground fault three-stage mower relays 37 and 38, an AND circuit 42 that receives the outputs of the ground fault three-stage moire relays 38 and 39, and the outputs of the ground fault three-stage mower relays 37 and 39. And an OR circuit 44 that receives the outputs of the AND circuits 41 to 43, an output of the OR circuit 44, and an OR circuit 40.
AND circuit 45 that receives the output of the AND circuit and the ground fault 1 that constitutes the time-delay operating circuit that receives the output of the AND circuit 45 as the input
And a phase detection timer 46, and the output of the ground fault 1-phase detection timer 46 is connected to the inhibition input of the inhibition circuit 28.
【００４３】したがって、この実施例７によれば、地絡
１相検出回路４７の出力を保護継電装置１の遮断指令阻
止信号として使用するようにしたので、１相地絡事故に
引き続く２相以上の系統事故に進展した場合でも、実施
例１の動作に加え、電力動揺検出装置２が保護継電装置
１の遮断指令を阻止しないようにすることができる。具
体的には、１相地絡事故が発生した場合、図１１のＡ図
に示すように、地絡３段モーリレー３７乃至３９のうち
の事故相に対応した１要素が動作し、次段のオア回路４
０が動作し、アンド回路４１乃至４３が不動作となり、
アンド回路４５が動作し、地絡１相検出用タイマー４６
が限時動作する。また、２相以上の地絡事故が発生した
場合、図１１のＢ図に示すように、地絡３段モーリレー
３７乃至３９のうちの事故相に対応した２要素が動作
し、次段のオア回路４０とアンド回路４１乃至４３とが
共に動作し、アンド回路４５が不動作となり、地絡１相
検出用タイマー４６が起動しない。結果として、１相地
絡事故に引き続く２相以上の系統事故に進展した場合で
も、動揺検出保持用タイマー３０の限時復帰と２段保護
用タイマー２３および３段保護用タイマー２４の限時動
作の大小関係に左右されることなく、保護継電装置１が
遮断指令を速やかに出力する。Therefore, according to the seventh embodiment, since the output of the ground fault 1-phase detection circuit 47 is used as the shutoff command blocking signal of the protective relay device 1, the 2-phase following the 1-phase ground fault accident is performed. Even when the above-mentioned system accident progresses, in addition to the operation of the first embodiment, it is possible to prevent the power fluctuation detection device 2 from blocking the cutoff command of the protective relay device 1. Specifically, when a one-phase ground fault accident occurs, as shown in FIG. 11A, one of the ground fault three-stage Mohre relays 37 to 39 corresponding to the fault phase operates and the next stage OR circuit 4
0 operates and AND circuits 41 to 43 do not operate,
The AND circuit 45 operates and the ground fault 1-phase detection timer 46
Works for a limited time. In addition, when a ground fault of two or more phases occurs, as shown in FIG. 11B, two elements of the ground fault three-stage motor relays 37 to 39 corresponding to the fault phase are activated, and the next stage OR The circuit 40 and AND circuits 41 to 43 operate together, the AND circuit 45 does not operate, and the ground fault 1-phase detection timer 46 does not start. As a result, even when a system accident of two or more phases following the one-phase ground fault occurs, the time delay of the oscillation detection and holding timer 30 and the time delay operation of the second stage protection timer 23 and the third stage protection timer 24 are large or small. The protective relay device 1 promptly outputs the cutoff command regardless of the relationship.
【００４４】[0044]
【発明の効果】第１の発明によれば、インピーダンス変
化率検出回路が電力系統のインピーダンスの変化が一定
値以下であることを検出し、このインピーダンス変化率
検出回路の検出動作が事故検出タイマーに設定された一
定時間以上継続すると、解除回路が保護継電装置への遮
断指令出力阻止を解除する構成としたので、電力系統に
電力動揺が発生している状態において系統事故が発生し
た場合でも、また、電力動揺検出リレーだけが動作する
ような遠方事故後に保護区間内事故に進展した場合で
も、動揺検出保持用タイマーの限時復帰と２段保護用タ
イマーおよび３段保護用タイマーの限時動作の大小関係
に左右されることなく、保護継電装置が遮断指令を速や
かに出力できるという効果がある。According to the first aspect of the invention, the impedance change rate detection circuit detects that the change in the impedance of the power system is less than a certain value, and the detection operation of the impedance change rate detection circuit is performed by the accident detection timer. Since the release circuit releases the blocking command output to the protective relay device if it continues for a set period of time or longer, even if a system accident occurs in the state where power fluctuation is occurring in the power system, In addition, even if the accident in the protection zone progresses after a distant accident in which only the power fluctuation detection relay operates, the time detection return of the fluctuation detection holding timer and the time delay operation of the two-step protection timer and the three-step protection timer are large or small. There is an effect that the protection relay device can promptly output the cutoff command regardless of the relationship.
【００４５】第２の発明によれば、インピーダンス変化
率検出回路の出力を受けた系統潮流不動作用回路が電力
動揺検出出力を入力として事故検出タイマーを不要に起
動しない構成としたので、電力系統の潮流に対する電力
動揺検出装置の誤動作を防止できるという効果がある。According to the second aspect of the present invention, the system power flow non-operation circuit which receives the output of the impedance change rate detection circuit is configured to use the power fluctuation detection output as an input and not to activate the accident detection timer unnecessarily. There is an effect that it is possible to prevent a malfunction of the power fluctuation detection device with respect to a power flow.
【００４６】第３の発明によれば、インピーダンス変化
率検出回路の出力を受けた系統潮流不動作用回路が電力
動揺検出出力または電力系統の事故時の過電流検出出力
を入力として事故検出タイマーを不要に起動しない構成
としたので、電力動揺検出装置を不要に不動作とせず、
系統潮流に対する電力動揺検出装置の誤動作を確実に阻
止できるという効果がある。According to the third aspect of the invention, the system power flow non-operation circuit which receives the output of the impedance change rate detection circuit receives the power fluctuation detection output or the overcurrent detection output at the time of a power system accident and does not need an accident detection timer. Since it is configured not to start up, the power fluctuation detector is not unnecessarily inoperative,
There is an effect that it is possible to surely prevent a malfunction of the power fluctuation detector with respect to the system power flow.
【００４７】第４の発明によれば、インピーダンス変化
率検出回路を各相ごとに設け、電力動揺検出装置が地絡
各相ごとと短絡とを出力する構成としたので、系統電力
動揺時において商用周波数が変化しても地絡保護継電装
置が遮断指令を不要に出力しないようにできるという効
果がある。According to the fourth aspect of the invention, the impedance change rate detection circuit is provided for each phase, and the power fluctuation detector outputs the ground fault for each phase and the short circuit. Even if the frequency changes, it is possible to prevent the ground fault protection relay device from unnecessarily outputting the cutoff command.
【００４８】第５の発明によれば、インピーダンス変化
率検出回路を電力系統の線間および相ごとに設け、電力
動揺検出装置が地絡各相ごとと短絡とを出力する構成と
したので、系統電力動揺時において商用周波数が変化し
ても地絡保護継電装置が遮断指令を不要に出力しないよ
うにできるという効果がある。According to the fifth aspect of the invention, the impedance change rate detection circuit is provided for each line and each phase of the power system, and the power fluctuation detector outputs the ground fault for each phase and the short circuit. Even if the commercial frequency changes during power fluctuation, there is an effect that the ground fault protection relay device can prevent the cutoff command from being output unnecessarily.
【００４９】第６の発明によれば、地絡１相検出回路を
設け、１相地絡事故に引き続き２相以上の事故に進展し
た場合に電力系統の電力動揺を検出する電力動揺検出リ
レーの出力を禁止する構成としてたので、動揺検出保持
用タイマーの限時復帰と２段保護用タイマーおよび３段
保護用タイマーの限時動作の大小関係に左右されること
なく、保護継電装置が遮断指令を速やかに出力できると
いう効果がある。According to the sixth aspect of the present invention, there is provided a ground fault 1-phase detection circuit, and a power fluctuation detection relay for detecting a power fluctuation of a power system when a 1-phase ground fault accident progresses to a 2-phase accident or more. Since the output is prohibited, the protection relay device sends the cutoff command regardless of the size relation between the time limit return of the motion detection and hold timer and the time limit operation of the two-step protection timer and the three-step protection timer. There is an effect that it can be output promptly.
【図１】 実施例１の保護継電装置を含む電力動揺検出
装置を示す構成図である。FIG. 1 is a configuration diagram illustrating a power fluctuation detection device including a protective relay device according to a first embodiment.
【図２】 実施例１の作用を説明するためのモーリレー
の動作波形図である。FIG. 2 is an operation waveform diagram of a moray relay for explaining the operation of the first embodiment.
【図３】 実施例１のインピーダンスリレーの作用を示
す説明図である。FIG. 3 is an explanatory diagram showing an operation of the impedance relay of the first embodiment.
【図４】 実施例２の保護継電装置を含む電力動揺検出
装置を示す構成図である。FIG. 4 is a configuration diagram showing a power fluctuation detecting device including a protective relay device according to a second embodiment.
【図５】 実施例３の保護継電装置を含む電力動揺検出
装置を示す構成図である。FIG. 5 is a configuration diagram showing a power fluctuation detection device including a protective relay device according to a third embodiment.
【図６】 実施例４の電力動揺検出装置を示す構成図で
ある。FIG. 6 is a configuration diagram illustrating a power fluctuation detection device according to a fourth embodiment.
【図７】 実施例４の作用を示すタイミングチャートで
ある。FIG. 7 is a timing chart showing the operation of the fourth embodiment.
【図８】 実施例５の電力動揺検出装置を示す構成図で
ある。FIG. 8 is a configuration diagram showing a power fluctuation detection device according to a fifth embodiment.
【図９】 実施例６の電力動揺検出装置を示す構成図で
ある。FIG. 9 is a configuration diagram illustrating a power fluctuation detection device according to a sixth embodiment.
【図１０】 実施例７の電力動揺検出装置を示す構成図
である。FIG. 10 is a configuration diagram showing a power fluctuation detector according to a seventh embodiment.
【図１１】 実施例７の作用を示すタイミングチャート
である。FIG. 11 is a timing chart showing the operation of the seventh embodiment.
【図１２】 従来の保護継電装置を含む電力動揺検出装
置を示す構成図である。FIG. 12 is a configuration diagram showing a power fluctuation detection device including a conventional protection relay device.
【図１３】 従来例の作用を説明するためのモーリレー
の動作波形図である。FIG. 13 is an operation waveform diagram of a moh relay for explaining the operation of the conventional example.
【図１４】 従来例の作用を説明するためのタイミング
チャートである。FIG. 14 is a timing chart for explaining the operation of the conventional example.
【図１５】 従来例の作用を説明するためのタイミング
チャートである。FIG. 15 is a timing chart for explaining the operation of the conventional example.
【図１６】 従来例の作用を説明するためのタイミング
チャートである。FIG. 16 is a timing chart for explaining the operation of the conventional example.
【図１７】 従来例の作用を説明するためのタイミング
チャートである。FIG. 17 is a timing chart for explaining the operation of the conventional example.
【符号の説明】 １ 保護継電装置、２ 電力動揺検出装置、３〜１１
短絡モーリレー、１２ 短絡オフセットモーリレー（電
力動揺検出リレー）、３１ 電力動揺検出出力用オア回
路、３２ インピーダンスリレー（インピーダンス変化
率検出回路）、３３ 事故検出タイマー、３４ 解除回
路、３５ 系統潮流不動作用アンド回路（系統潮流不動
作用回路）、３６ 過電流検出リレー（事故検出回
路）、３７〜３９ 地絡３段モーリレー、４６ 地絡検
出タイマー、４７ 地絡１相検出回路、５１ 地絡第１
相検出リレー、５２ 地絡第２相検出リレー、５３ 地
絡第３相検出リレー、８１ 短絡第１相検出リレー、８
２ 短絡第２相検出リレー、８３ 短絡第３相検出リレ
ー。[Explanation of reference numerals] 1 protection relay device, 2 power fluctuation detection device, 3 to 11
Short circuit mode relay, 12 short circuit offset mode relay (power fluctuation detection relay), 31 power fluctuation detection output OR circuit, 32 impedance relay (impedance change rate detection circuit), 33 accident detection timer, 34 release circuit, 35 system power flow non-operation AND Circuit (system power flow non-operation circuit), 36 Overcurrent detection relay (accident detection circuit), 37-39 Ground fault three-stage Mo relay, 46 Ground fault detection timer, 47 Ground fault 1-phase detection circuit, 51 Ground fault 1st
Phase detection relay, 52 Ground fault second phase detection relay, 53 Ground fault third phase detection relay, 81 Short circuit first phase detection relay, 8
2 short circuit second phase detection relay, 83 short circuit third phase detection relay.
Claims (6)
電力系統の保護を行うための保護継電装置から出力され
る遮断指令を阻止する電力系統の電力動揺検出装置にお
いて、 電力系統のインピーダンスの変化率を検出するインピー
ダンス変化率検出回路と、 このインピーダンス変化率検出回路の出力によって動作
する事故検出タイマーと、 この事故検出タイマーの出力および上記電力揺動検出出
力の論理積によって上記保護継電装置への遮断指令阻止
を解除する解除回路と、を備えたことを特徴とする電力
系統の電力動揺検出装置。1. A power fluctuation detection device for a power system that blocks a cutoff command output from a protection relay device for protecting the power system according to a power fluctuation detection output of the power system, comprising: An impedance change rate detection circuit that detects a change rate, an accident detection timer that operates by the output of this impedance change rate detection circuit, and the protection relay device by the logical product of the output of this accident detection timer and the power fluctuation detection output. A power fluctuation detection device for a power system, comprising: a release circuit that releases the blocking command to the power supply.
力と事故検出タイマーの入力とが電力動揺検出出力を入
力とする系統潮流不動作用回路を介して接続されたこと
を特徴とする請求項第１項記載の電力系統の電力動揺検
出装置。2. The system according to claim 1, wherein the output of the impedance change rate detection circuit and the input of the accident detection timer are connected via a system power flow non-operation circuit having the power fluctuation detection output as an input. A power fluctuation detection device for the power system described.
ンス変化率検出回路の出力と電力動揺検出出力と電力系
統の過電流を検出する事故検出回路の出力とを入力とす
る論理回路にて構成されたことを特徴とする請求項第２
項記載の電力系統の電力動揺検出装置。3. The system power flow non-operation circuit is composed of a logic circuit which receives an output of an impedance change rate detection circuit, a power fluctuation detection output, and an output of an accident detection circuit for detecting an overcurrent of the power system. The second aspect of the present invention.
A power fluctuation detection device for a power system according to the item.
故検出タイマーおよび解除回路が電力系統の相ごとに設
けられたことを特徴とする請求項第１項記載の電力系統
の電力動揺検出装置。4. The power system power fluctuation detection device according to claim 1, wherein the impedance change rate detection circuit, the accident detection timer, and the release circuit are provided for each phase of the power system.
力系統の線間および相ごとに設けられたことを特徴とす
る請求項第４項記載の電力系統の電力動揺検出装置。5. The power fluctuation detection device for a power system according to claim 4, wherein the impedance change rate detection circuit is provided for each line and each phase of the power system.
検出リレーを備え、この電力動揺検出リレーの検出出力
に応じ上記電力系統の保護を行うための保護継電装置か
ら出力される遮断指令を阻止する電力系統の電力動揺検
出装置において、 前記電力系統の地絡１相事故を検出しこの検出出力にて
電力動揺検出リレーの出力を禁止する地絡１相検出回路
を備えたことを特徴とする電力系統の電力動揺検出装
置。6. A power fluctuation detection relay for detecting a power fluctuation of the power system, and a cutoff command output from a protection relay device for protecting the power system according to a detection output of the power fluctuation detection relay. A power fluctuation detecting device for a power system for blocking, comprising: a ground fault 1-phase detection circuit for detecting a ground fault 1-phase accident in the power system and for prohibiting the output of the power fluctuation detection relay by the detection output. Power fluctuation detection device for power system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6089356A JP2798885B2 (en) | 1994-04-27 | 1994-04-27 | Power fluctuation detection device for power system |
| CN95103484A CN1045849C (en) | 1994-04-27 | 1995-04-27 | Power swing detection apparatus for electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6089356A JP2798885B2 (en) | 1994-04-27 | 1994-04-27 | Power fluctuation detection device for power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07298499A true JPH07298499A (en) | 1995-11-10 |
| JP2798885B2 JP2798885B2 (en) | 1998-09-17 |
Family
ID=13968440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6089356A Expired - Fee Related JP2798885B2 (en) | 1994-04-27 | 1994-04-27 | Power fluctuation detection device for power system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2798885B2 (en) |
| CN (1) | CN1045849C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468797B1 (en) * | 2001-08-27 | 2005-02-02 | 가부시끼가이샤 도시바 | Protective relay system |
| WO2010006632A1 (en) * | 2008-07-17 | 2010-01-21 | Siemens Aktiengesellschaft | Method for producing a fault signal and electric protective device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2471274C2 (en) * | 2008-07-07 | 2012-12-27 | Абб Рисерч Лтд | Method and device for quick unlocking of remote protection in case of power oscillation in power system |
| RU2525841C2 (en) * | 2009-12-16 | 2014-08-20 | Сименс Акциенгезелльшафт | Protection of parallel lines of power supply grid |
| CN104037741B (en) * | 2009-12-16 | 2017-10-24 | 西门子公司 | The protection of the parallel wire of electrical energy supply system |
| CN111323644B (en) * | 2020-03-17 | 2022-11-18 | 广东恒港电力科技股份有限公司 | Intelligent monitoring method and system based on electric energy meter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045666A (en) * | 1989-03-15 | 1990-09-26 | 刘联和 | Commutating distribution-difference type relay-protection part |
| CN2101940U (en) * | 1991-10-23 | 1992-04-15 | 张护民 | Reactive power compensating controller for current fluctuation |
| CN2147674Y (en) * | 1993-01-14 | 1993-11-24 | 赵根田 | Wire distribution section protection and grounding display device |
-
1994
- 1994-04-27 JP JP6089356A patent/JP2798885B2/en not_active Expired - Fee Related
-
1995
- 1995-04-27 CN CN95103484A patent/CN1045849C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468797B1 (en) * | 2001-08-27 | 2005-02-02 | 가부시끼가이샤 도시바 | Protective relay system |
| WO2010006632A1 (en) * | 2008-07-17 | 2010-01-21 | Siemens Aktiengesellschaft | Method for producing a fault signal and electric protective device |
| US8736297B2 (en) | 2008-07-17 | 2014-05-27 | Siemens Aktiengesellschaft | Method for production of a fault signal, and an electrical protective device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1045849C (en) | 1999-10-20 |
| CN1122962A (en) | 1996-05-22 |
| JP2798885B2 (en) | 1998-09-17 |
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