JPH0993786A - Undervoltage relay supervising circuit - Google Patents

Undervoltage relay supervising circuit

Info

Publication number
JPH0993786A
JPH0993786A JP7296054A JP29605495A JPH0993786A JP H0993786 A JPH0993786 A JP H0993786A JP 7296054 A JP7296054 A JP 7296054A JP 29605495 A JP29605495 A JP 29605495A JP H0993786 A JPH0993786 A JP H0993786A
Authority
JP
Japan
Prior art keywords
undervoltage
relay
voltage
circuit
phases
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.)
Granted
Application number
JP7296054A
Other languages
Japanese (ja)
Other versions
JP3468950B2 (en
Inventor
Tomoyoshi Komaki
友義 小牧
Tokuo Ito
徳男 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP29605495A priority Critical patent/JP3468950B2/en
Publication of JPH0993786A publication Critical patent/JPH0993786A/en
Application granted granted Critical
Publication of JP3468950B2 publication Critical patent/JP3468950B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary detection of supervisory failure even when an input voltage to an undervoltage relay changes gradually. SOLUTION: It is confirmed for the period 61 longer than the predetermined time that an output of any phase of the undervoltage relays 1A, 1B, 1C to which a phase voltage is input or the undervoltage relays 2A, 2B, 2C to which a line voltage is input or an output of the contacts 31a, 32a of auxiliary relays 31, 32 which operates in response to such undervoltage relays is in the condition of detecting the undervoltage. On the occasion of supervising failure of the relay, it is impeded to confirm the predetermined period even in any condition that three phases of the undervoltage relays 2A, 2B, 2C to which a line voltage is input are in the condition of detecting under voltage or three phases of the undervoltage relays 1A, 1B, 1C to which a phase voltage is input are in the condition of detecting undervoltage.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、電力系統を保護す
るために用いる不足電圧継電器の監視回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an undervoltage relay monitoring circuit used for protecting a power system.

【０００２】[0002]

【従来の技術】電力系統の保護には、その対象によって
各種の保護継電装置が用いられ、なかんずく不足電圧継
電器も頻繁に使用している。又、保護継電器装置は、通
常、信頼度の向上を目的として、継電器等の誤動作を監
視するために監視回路を有しており、上記の不足電圧継
電器も監視対象としている。2. Description of the Related Art In order to protect a power system, various protective relay devices are used depending on the object, and in particular, an undervoltage relay is also frequently used. Further, the protective relay device usually has a monitoring circuit for monitoring malfunctions of the relay or the like for the purpose of improving reliability, and the above-mentioned undervoltage relay is also a monitoring target.

【０００３】図16は従来の不足電圧継電器の監視回路の
ブロック図の一例である。図16において、３相交流の各
線間電圧を入力とする不足電圧継電器１Ａ，１Ｂ及び１
ＣはＯＲ回路11を介して駆動回路21に接続され、その出
力は補助継電器31に接続される。FIG. 16 is an example of a block diagram of a conventional monitoring circuit for an undervoltage relay. In FIG. 16, undervoltage relays 1A, 1B and 1 which receive the line voltages of the three-phase AC as input
C is connected to the drive circuit 21 via the OR circuit 11, and its output is connected to the auxiliary relay 31.

【０００４】３相交流の各相電圧を入力とする不足電圧
継電器２Ａ，２Ｂ及び２ＣはＯＲ回路12を回路して駆動
回路22に接続され、その出力は補助継電器32へ接続され
る。そして補助継電器31のａ接点31a ，補助継電器32の
ａ接点32a は、夫々一端を“１”信号に接続し、他端を
ＯＲ回路13に接続する。The undervoltage relays 2A, 2B and 2C which receive the respective phase voltages of the three-phase alternating current are connected to the drive circuit 22 through the circuit of the OR circuit 12, and the output thereof is connected to the auxiliary relay 32. The a-contact 31a of the auxiliary relay 31 and the a-contact 32a of the auxiliary relay 32 have one end connected to the "1" signal and the other end connected to the OR circuit 13.

【０００５】ＯＲ回路13の出力はＡＮＤ回路42を回路し
て動作遅延回路61へ接続する。不足電圧継電器１Ａ，１
Ｂ，１Ｃ及び２Ａ，２Ｂ，２ＣはＡＮＤ回路41へも接続
し、この出力はＮＯＴ回路51を介してＡＮＤ回路42の入
力へ接続される。動作遅延回路61の出力は不足電圧継電
器の監視不良を判定した結果である。The output of the OR circuit 13 is connected to the operation delay circuit 61 through the AND circuit 42. Undervoltage relay 1A, 1
B, 1C and 2A, 2B, 2C are also connected to the AND circuit 41, and the output is connected to the input of the AND circuit 42 via the NOT circuit 51. The output of the operation delay circuit 61 is the result of determining the monitoring failure of the undervoltage relay.

【０００６】次にその動作について説明する。系統事故
が発生した場合は線間電圧又は相電圧あるいは双方の電
圧が低下し、事故様相により不足電圧継電器１Ａ，１
Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃの内の該当する継電器が不
足電圧を検出して動作するため、ＯＲ回路11又は12、駆
動回路21又は22を介して補助継電器31又は32が応動す
る。Next, the operation will be described. When a system fault occurs, the line voltage, the phase voltage, or both voltages drop, and the undervoltage relays 1A, 1
Since the corresponding relay among B, 1C, 2A, 2B, and 2C detects the undervoltage and operates, the auxiliary relay 31 or 32 responds via the OR circuit 11 or 12 and the drive circuit 21 or 22.

【０００７】補助継電器31又は32が動作すると、そのａ
接点31a 又は32a を閉路するのでＯＲ回路13へ“１”信
号が入力され、ＡＮＤ回路42を介して動作遅延回路61へ
信号を与える。ここで、動作遅延回路61の限時は、系統
事故中の時間より十分長く設定してあるのでその出力を
生じない。When the auxiliary relay 31 or 32 operates, its a
Since the contact 31a or 32a is closed, the "1" signal is input to the OR circuit 13, and the signal is given to the operation delay circuit 61 via the AND circuit 42. Here, since the time delay of the operation delay circuit 61 is set to be sufficiently longer than the time during the system fault, its output is not generated.

【０００８】ところが、不足電圧継電器１Ａ，１Ｂ，１
Ｃ，２Ａ，２Ｂ．２Ｃのいずれかが誤動作した場合は、
当該継電器の出力が継続するので、動作遅延回路61の限
時後に監視不良と判定する。However, the undervoltage relays 1A, 1B, 1
C, 2A, 2B. If any of 2C malfunctions,
Since the output of the relay continues, it is determined that the monitoring delay has occurred after the time delay of the operation delay circuit 61.

【０００９】一方、電力系統では系統運用上、停電を生
じることがあるが、この場合は、不足電圧継電器１Ａ，
１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃの全てが動作し前記の説
明と同様にＯＲ回路13が出力を生じるが、ＡＮＤ回路41
も成立し、ＮＯＴ回路51がＡＮＤ回路42を阻止するの
で、動作遅延回路61は出力を生じない。On the other hand, in the power system, a power failure may occur during system operation. In this case, the undervoltage relay 1A,
Although all of 1B, 1C, 2A, 2B and 2C operate and the OR circuit 13 produces an output as in the above description, the AND circuit 41
Since the NOT circuit 51 blocks the AND circuit 42, the operation delay circuit 61 does not produce an output.

【００１０】又、図17は他の従来例であり、構成上の特
徴は、ＡＮＤ回路41の入力を不足電圧継電器１Ａ，１
Ｂ，１Ｃのみとして点にある。この構成においても、停
電時にはＡＮＤ回路42が阻止されて、動作遅延回路61に
より監視不良を判定することはなく、不足電圧継電器の
誤動作検出においても不足電圧継電器の３相が同時に不
良になることはないため、何ら不都合は生じない。FIG. 17 shows another conventional example, which is characterized in that the input of the AND circuit 41 is connected to the undervoltage relays 1A and 1A.
Only B and 1C are in point. Even in this configuration, the AND circuit 42 is not blocked at the time of a power failure, and the operation delay circuit 61 does not determine the monitoring failure, and even when the malfunction of the undervoltage relay is detected, the three phases of the undervoltage relay may fail simultaneously. Since it does not exist, no inconvenience occurs.

【００１１】更に図18は更に他の従来例であり、この場
合の特徴は各相電圧を入力とする不足電圧継電器２Ａ，
２Ｂ，２Ｃがない。したがってこの構成においても不足
電圧継電器の誤動作検出及び停電時の監視不良判定の阻
止には何ら不都合を生じない。FIG. 18 shows still another conventional example, and the characteristic of this case is that the undervoltage relay 2A, which receives the voltage of each phase,
There is no 2B or 2C. Therefore, even in this configuration, there is no inconvenience in detecting the malfunction of the undervoltage relay and preventing the monitoring failure determination at the time of power failure.

【００１２】[0012]

【発明が解決しようとする課題】上記したように不足電
圧継電器の監視回路においては、系統事故時の短時間の
電圧低下により監視不良を検出することを防止するため
に適当な確認時限を設け、停電時に不足電圧継電器が継
続して動作した場合でも監視不良を不要に検出すること
がないように、全ての不足電圧継電器あるいは代表の不
足電圧継電器が３相とも動作したことを条件に、前記の
確認時限の計数を阻止するように構成している。As described above, in the monitoring circuit of the undervoltage relay, an appropriate confirmation time limit is provided in order to prevent detection of a monitoring failure due to a short voltage drop during a system fault, Even if the undervoltage relay continues to operate during a power failure, all of the undervoltage relays or representative undervoltage relays are operated so that they do not unnecessarily detect faulty monitoring. It is configured so as to prevent counting in the confirmation time period.

【００１３】しかし、電力系統の設備の新設時には、発
電機の出力電圧を緩やかに上昇する試験を行なうことが
あり、不足電圧継電器の入力電圧が緩変化を生ずること
がある。However, when new equipment is installed in the power system, a test for gradually increasing the output voltage of the generator may be performed, and the input voltage of the undervoltage relay may change slowly.

【００１４】図19は不足電圧継電器への入力電圧が時間
と共に緩変化する様子を示すものであり、電圧軸の１
Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃは、夫々不足電圧継
電器１Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃの動作値を示
している。図19（ａ）は発電機の出力電圧を一定の割合
いで徐々に上昇していく場合を示す。FIG. 19 shows how the input voltage to the undervoltage relay changes slowly with time.
A, 1B, 1C, 2A, 2B and 2C indicate operating values of the undervoltage relays 1A, 1B, 1C, 2A, 2B and 2C, respectively. FIG. 19A shows a case where the output voltage of the generator is gradually increased at a constant rate.

【００１５】これらの場合の各不足電圧継電器は以下の
動作状態を有する。 時刻ｔ1 以前：不足電圧継電器１Ａ，１Ｂ，１Ｃ，２
Ａ，２Ｂ，２Ｃとも全て動作している。 時刻ｔ1 〜ｔ2 ：不足電圧継電器２Ａ，２Ｂ，２Ｃは動
作したままであるが不足電圧継電器１Ａ，１Ｂ，１Ｃは
復帰する。 時刻ｔ2 以降：不足電圧継電器１Ａ，１Ｂ，１Ｃ，２
Ａ，２Ｂ，２Ｃは全て復帰している。 この場合における従来の不足電圧継電器の監視回路の応
動について、図を参照しながら説明する。Each undervoltage relay in these cases has the following operating states: Before time t 1 : Undervoltage relays 1A, 1B, 1C, 2
All of A, 2B and 2C are operating. Time t 1 ~t 2: under voltage relay 2A, 2B, 2C are remains operating under voltage relay 1A, 1B, 1C returns. After time t 2 : Undervoltage relays 1A, 1B, 1C, 2
All of A, 2B and 2C have been restored. The response of the conventional monitoring circuit of the undervoltage relay in this case will be described with reference to the drawings.

【００１６】図16の回路において、時刻ｔ1 以前では、
補助継電器31，32が動作しＯＲ回路13がＡＮＤ回路42へ
動作側信号を与える。一方、ＡＮＤ回路41も成立するの
でＮＯＴ回路51がＡＮＤ回路42を阻止して動作遅延回路
61は不良判定出力を生じない。In the circuit of FIG. 16, before time t 1 ,
The auxiliary relays 31 and 32 operate and the OR circuit 13 gives an operation side signal to the AND circuit 42. On the other hand, since the AND circuit 41 is also established, the NOT circuit 51 blocks the AND circuit 42 and the operation delay circuit.
61 does not generate a defect determination output.

【００１７】時刻ｔ1 〜ｔ2 の間では、補助継電器31は
動作しているのでＯＲ回路13が成立してＡＮＤ回路42へ
動作側信号を与える。一方、不足電圧継電器１Ａ，１
Ｂ，１Ｃが復帰しているのでＡＮＤ回路41は成立せず、
ＮＯＴ回路51はＡＮＤ回路42を阻止しない。Between times t 1 and t 2 , since the auxiliary relay 31 is operating, the OR circuit 13 is established and the AND circuit 42 is supplied with an operation side signal. On the other hand, undervoltage relays 1A, 1
Since B and 1C are restored, the AND circuit 41 does not work,
The NOT circuit 51 does not block the AND circuit 42.

【００１８】従ってｔ1 〜ｔ2 までの時間が動作遅延回
路61の時限より長い場合は、不要に監視不良を検出す
る。時刻ｔ2 以降は不足電圧継電器１Ａ，１Ｂ，１Ｃが
全て復帰するので補助継電器31，32も復帰し、ＯＲ回路
13は成立せず、監視不良を検出することはない。Therefore, if the time from t 1 to t 2 is longer than the time limit of the operation delay circuit 61, the monitoring failure is unnecessarily detected. After time t 2 , all the undervoltage relays 1A, 1B, 1C are restored, so the auxiliary relays 31, 32 are also restored, and the OR circuit
13 does not hold, and no monitoring failure is detected.

【００１９】図17の回路においても、図16と同様の応動
を示す。即ち、時刻ｔ1 以前では不足電圧継電器１Ａ，
１Ｂ，１Ｃが動作しているので、ＡＮＤ回路41が成立
し、ＮＯＴ回路51によりＡＮＤ回路42を阻止して不良判
定出力を生じない。The circuit of FIG. 17 also exhibits the same response as that of FIG. That is, before the time t 1 , the undervoltage relay 1A,
Since 1B and 1C are operating, the AND circuit 41 is established, and the NOT circuit 51 prevents the AND circuit 42 from generating a defect determination output.

【００２０】時刻ｔ1 〜ｔ2 の間では、前記と同様にＯ
Ｒ回路13が成立し、ＡＮＤ回路41が不成立であるためＡ
ＮＤ回路42を阻止できず、ｔ1 〜ｔ2 までの時間が動作
遅延回路61の時限より長い場合は不要に監視不良を検出
する。時刻ｔ2 以降は前記と同様に監視不良を検出する
ことはない。Between times t 1 and t 2 , O is the same as above.
Since the R circuit 13 is established and the AND circuit 41 is not established, A
If the ND circuit 42 cannot be blocked and the time from t 1 to t 2 is longer than the time limit of the operation delay circuit 61, the monitoring failure is unnecessarily detected. Time t 2 later is not possible to detect a failure monitoring in the same manner as described above.

【００２１】図18の回路の場合は、時刻ｔ1 以前はＡＮ
Ｄ回路41が成立し、ＮＯＴ回路51によりＡＮＤ回路42を
阻止して監視不良を検出することはない。時刻ｔ1 以降
は不足電圧継電器１Ａ，１Ｂ，１Ｃとも復帰するので、
補助継電器31も復帰してＡＮＤ回路42に動作側信号を与
えないので監視不良を検出することはない。In the case of the circuit of FIG. 18, before time t 1, AN
The D circuit 41 is established, and the NOT circuit 51 does not block the AND circuit 42 to detect the monitoring failure. After time t 1, all the undervoltage relays 1A, 1B, 1C are restored, so
Since the auxiliary relay 31 also recovers and the operation side signal is not given to the AND circuit 42, the monitoring failure is not detected.

【００２２】次に図19（ｂ）は発電機の出力電圧を徐々
に上昇する過程を段階的に実施する場合を示す。 時刻ｒ3 以前：不足電圧継電器１Ａ，１Ｂ，１Ｃ，２
Ａ，２Ｂ，２Ｃは全て動作している。 時刻ｔ3 〜ｔ4 ：３相の不足電圧継電器１Ａ，１Ｂ，１
Ｃの動作値のばらつき範囲内で電圧上昇が暫時停滞した
ため、不足電圧継電器１Ｂ，１Ｃのみ復帰している。Next, FIG. 19B shows a case where the process of gradually increasing the output voltage of the generator is carried out stepwise. Time r 3 before: under voltage relay 1A, 1B, 1C, 2
All of A, 2B and 2C are operating. Time t 3 ~t 4: 3-phase under voltage relay 1A of, 1B, 1
Since the voltage rise temporarily stagnates within the variation range of the operating value of C, only the undervoltage relays 1B and 1C are restored.

【００２３】時刻ｔ4 〜ｔ2 ；不足電圧継電器１Ａ，１
Ｂ，１Ｃは復帰し、不足電圧継電器２Ａ，２Ｂ，２Ｃは
動作している。 時刻ｔ2 以降；不足電圧継電器１Ａ，１Ｂ，１Ｃ，２
Ａ，２Ｂ，２Ｃとも復帰している。この場合の従来の不
足電圧継電器の監視回路の応動について各場合毎に説明
する。Times t 4 to t 2 ; undervoltage relays 1A, 1
B and 1C are restored, and the undervoltage relays 2A, 2B and 2C are operating. Time t 2 later; under voltage relay 1A, 1B, 1C, 2
All of A, 2B and 2C have returned. The response of the conventional monitoring circuit of the undervoltage relay in this case will be described in each case.

【００２４】先ず図16の回路において時刻ｔ3 以前は図
19（ａ）の説明と同様に監視不良を検出することはな
い。時刻ｔ3 〜ｔ4 の間では図19（ａ）の説明と同様に
ＡＮＤ回路41が不成立となるので、ｔ3 〜ｔ4 の時間が
動作遅延回路61の限時より長い場合は、不要に監視不良
を検出する。時刻ｔ4 〜ｔ2 の間は図19（ａ）の説明と
同様に不要に監視不良を検出する。時刻ｔ2 以降は監視
不良を検出することなない。[0024] First time t 3 earlier in the circuit of FIG. 16 Fig.
As in the case of 19 (a), no monitoring failure is detected. Since the AND circuit 41 similar to the description shown in FIG. 19 (a) is not satisfied between the time t 3 ~t 4, if the time t 3 ~t 4 is longer than the time limit of the operation delay circuit 61, unnecessary monitoring Detect defects. Time between t 4 ~t 2 detects Similarly unnecessarily monitor defective and described in FIG. 19 (a). There is no such that time t 2 and later to detect the monitoring failure.

【００２５】図17の回路においても、上記と同様である
ので説明は省略する。図18の回路において、時刻ｔ3 〜
ｔ4 の間では不足電圧継電器１Ｂ，１Ｃが復帰している
ので、ＡＮＤ回路41が不成立となり、不要に監視不良を
検出する。The circuit shown in FIG. 17 is similar to the above, and its explanation is omitted. In the circuit of FIG. 18, from time t 3 onward.
under voltage relay 1B Between t 4, since 1C is restored, the AND circuit 41 becomes unsatisfied, unnecessarily to detect the monitored defect.

【００２６】上記説明したように、電力系統の設備の試
験のために発電機の出力電圧を緩やかに上昇する場合な
どのように、不足電圧継電器への入力電圧が緩変化を生
じる場合には、不足電圧継電器の監視回路において、不
要に監視不良を検出することがある。As described above, when the input voltage to the undervoltage relay causes a gradual change, such as when the output voltage of the generator is gradually increased for testing the equipment of the power system, The monitoring circuit of the undervoltage relay may unnecessarily detect a monitoring failure.

【００２７】この結果、複数の装置から一斉に不良警報
が発せられたり、不良時の処置として装置の自動ロック
回路が動作することにより電力系統を保護する装置が使
用されなくなったりして、信頼性の低下を招き、装置の
運用上の不都合を生じる。As a result, a plurality of devices simultaneously issue a failure alarm, or the device for protecting the electric power system is not used because the automatic lock circuit of the devices operates as a measure for the failure, so that the reliability is improved. Is caused, which causes inconvenience in the operation of the device.

【００２８】本発明は上記課題を解決するためになされ
たものであり、不足電圧継電器の入力電圧が緩変化を生
じる時でも、不要に監視不良を検出しない信頼性の高い
不足電圧継電器の監視回路を提供することを目的として
いる。The present invention has been made to solve the above problems, and has a highly reliable monitoring circuit for an undervoltage relay that does not unnecessarily detect a monitoring failure even when the input voltage of the undervoltage relay changes slowly. Is intended to provide.

【００２９】[0029]

【課題を解決するための手段】本発明の請求項１に係る
不足電圧継電器の監視回路は、３相に設けた相電圧を入
力とする不足電圧継電器あるいは線間電圧を入力とする
不足電圧継電器のいずれかの相の出力又はこれに応動す
る補助継電器の設定出力が、所定時間以上にわたって不
足電圧を検出した状態にあることを確認して当該継電器
の不良と判定する不足電圧継電器の監視回路において、
前記相電圧を入力とする不足電圧継電器が３相とも不足
電圧を検出した状態にあるか、又は前記線間電圧を入力
とする不足電圧継電器が３相とも不足電圧を検出した状
態にあるかのいずれの条件にても、前記所定時間の確認
を阻止する構成とした。A monitoring circuit for an undervoltage relay according to claim 1 of the present invention is an undervoltage relay for inputting a phase voltage provided for three phases or an undervoltage relay for inputting a line voltage. In the monitoring circuit of the undervoltage relay, it is determined that the output of any of the phases or the set output of the auxiliary relay responding to this is in the state of detecting the undervoltage for a predetermined time or longer and it is determined that the relay is defective. ,
Whether the undervoltage relay having the phase voltage as an input detects the undervoltage in all three phases, or whether the undervoltage relay having the line voltage as an input detects the undervoltage in all three phases Under any of the conditions, the confirmation of the predetermined time is prevented.

【００３０】上記構成において徐々に電圧が上昇する系
統現象が生じた場合に、相電圧を入力とする不足電圧継
電器と線間電圧を入力とする不足電圧継電器の検出感度
に差を生じていても、いずれか一方の継電器の出力で監
視不良を検出する所定時限の確認を阻止する。When a system phenomenon in which the voltage gradually rises occurs in the above configuration, even if there is a difference in detection sensitivity between the undervoltage relay inputting the phase voltage and the undervoltage relay inputting the line voltage. , The confirmation of the monitoring failure is detected by the output of either one of the relays for a predetermined period of time.

【００３１】本発明の請求項２に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器又はこれに
応動する補助継電器の接点出力については、相電圧を入
力とする不足電圧継電器が３相とも不足電圧を検出した
状態にあることを条件に、又、線間電圧を入力とする不
足電圧継電器又はこれに応動する補助継電器の接点出力
については、線間電圧を入力とする不足電圧継電器が３
相とも不足電圧を検出した状態にあることを条件に構成
した。そして不足電圧を検出している継電器の出力で監
視不良を検出する所定時限の確認を阻止する。A monitoring circuit for an undervoltage relay according to claim 2 of the present invention is the undervoltage relay monitoring circuit according to claim 1, wherein the condition for preventing confirmation of a predetermined time is an undervoltage relay having a phase voltage as an input or an auxiliary relay responsive thereto. Regarding contact output, on condition that the undervoltage relay that inputs the phase voltage is in the state of detecting the undervoltage for all three phases, the undervoltage relay that inputs the line voltage or the auxiliary relay that responds to this Regarding the contact output of, the undervoltage relay that inputs the line voltage is 3
Both phases were configured on condition that the undervoltage was detected. Then, the confirmation of the monitoring failure is detected at the predetermined time limit by the output of the relay detecting the undervoltage.

【００３２】本発明の請求項３に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器及び線間電
圧を入力とする不足電圧継電器のいずれもが３相とも不
足電圧を検出した状態にあることを一定時間だけ引き延
ばすことを条件に構成した。従っていずれかの不足電圧
継電器が不足電圧を検出しない状態になった後も、監視
不良を検出する所定時限の確認を一定時間の間は阻止す
る。According to a third aspect of the present invention, in the monitoring circuit of the undervoltage relay according to the first aspect, the condition for preventing confirmation of a predetermined time is the undervoltage relay having a phase voltage as an input and the line voltage as an input. All of the undervoltage relays are configured so that all three phases are in a state where the undervoltage is detected, and the delay is extended for a certain period of time. Therefore, even after one of the undervoltage relays is in a state where the undervoltage is not detected, the confirmation of the predetermined time period for detecting the monitoring failure is blocked for a certain period of time.

【００３３】本発明の請求項４に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器及び線間電
圧を入力とする不足電圧継電器のいずれもが３相とも不
足電圧を検出した状態にあることを、一定時間だけ確認
した後、一定時間だけ引き延ばすことを条件に構成し
た。According to a fourth aspect of the present invention, in the monitoring circuit for an undervoltage relay according to the first aspect, the condition for preventing confirmation of a predetermined time is an undervoltage relay having a phase voltage as an input and a line voltage as an input. All of the undervoltage relays were configured to be under the condition that the undervoltages were detected in all three phases for a certain period of time, and then extended for a certain period of time.

【００３４】そして線間電圧，相電圧ともに低下したこ
とを一定時間の間確認した後に、いずれかの不足電圧継
電器が不足電圧を検出しない状態になっても、監視不良
を検出する所定時限の確認を一定時間の間阻止する。After confirming that both the line voltage and the phase voltage have decreased for a certain period of time, even if any of the undervoltage relays does not detect the undervoltage, a confirmation of a predetermined time period for detecting a monitoring failure is performed. For a certain period of time.

【００３５】本発明の請求項５に係る不足電圧継電器の
監視回路は、３相に設けた不足電圧継電器のいずれかの
相の出力又はこれに応動する補助継電器の出力接点が、
所定時間以上にわたって不足電圧を検出した状態にある
ことを確認して、当該継電器の不良と判定する不足電圧
継電器の監視回路において、当該不足電圧継電器が３相
とも不足電圧を検出した状態にあることを一定時間引き
延ばした条件にて前記所定時間の確認を阻止させるよう
に構成した。In the undervoltage relay monitoring circuit according to claim 5 of the present invention, the output contact of any one of the phases of the undervoltage relay provided in the three phases or the output contact of the auxiliary relay responding to the output,
Confirm that the undervoltage has been detected for a predetermined time or more, and judge that the relay is defective. In the monitoring circuit of the undervoltage relay, the undervoltage relay must be in a state in which all three phases have detected the undervoltage. Is configured to be prevented from being confirmed for the predetermined period of time under the condition of being extended for a certain period of time.

【００３６】従って徐々に電圧上昇する系統現象が生
じ、３相の不足電圧継電器の不足電圧の検出に不揃いを
生じる電圧で暫く停滞しても、監視不良を検出する所定
時限の確認を一定時間の間は阻止する。Therefore, a system phenomenon in which the voltage gradually rises occurs, and even if there is a temporary stagnation at the voltage that causes uneven detection of the undervoltage of the three-phase undervoltage relay, the confirmation of the predetermined time period for detecting the monitoring failure is confirmed for a certain time. Stop for a while.

【００３７】本発明の請求項６に係る不足電圧継電器の
監視回路は、請求項５において、所定時間の確認の阻止
条件を、３相とも不足電圧を検出した状態にあることを
一定時間だけ確認した後に、一定時間だけ引き延ばすこ
とを条件に構成した。そこで３相の不足電圧継電器が電
圧低下したことを一定時間確認した後に、上記の電圧停
滞を生じても、監視不良を検出する所定時限の確認を一
定時間の間は阻止する。According to a sixth aspect of the present invention, in the undervoltage relay monitoring circuit of the fifth aspect, the check condition for confirming a predetermined time is confirmed for a certain period of time in which the undervoltage is detected in all three phases. After that, it was constructed on the condition that it was extended for a certain period of time. Therefore, after confirming that the voltage of the three-phase undervoltage relay has dropped for a certain period of time, even if the above-mentioned voltage stagnation occurs, confirmation of a predetermined time period for detecting a monitoring failure is blocked for a certain period of time.

【００３８】本発明の請求項７に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器及び線間電
圧を入力とする不足電圧継電器のいずれもが３相とも不
足電圧を検出したことを記憶し、前記不足電圧継電器の
いずれもが３相とも不足電圧を検出していないことを条
件に、前記記憶を解除するように構成した。According to a seventh aspect of the present invention, in the monitoring circuit for an undervoltage relay according to the first aspect, the condition for preventing confirmation of a predetermined time is an undervoltage relay having a phase voltage as an input and a line voltage as an input. It is stored that any of the undervoltage relays has detected an undervoltage in all three phases, and the storage is canceled on the condition that none of the undervoltage relays has detected an undervoltage in all three phases. Configured.

【００３９】そして、一旦、線間電圧，相電圧とも低下
したことを不足電圧継電器で検出した場合は、これらの
不足電圧継電器が全て不足電圧を検出しなくなるまでは
監視不良を検出する所定時限の確認を阻止する。When the undervoltage relay detects once that both the line voltage and the phase voltage have dropped, a predetermined time limit for detecting a monitoring failure is detected until these undervoltage relays no longer detect the undervoltage. Block confirmation.

【００４０】本発明の請求項８に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器が３相とも
不足電圧を検出した状態にあるか、又は線間電圧を入力
とする不足電圧継電器が３相とも不足電圧を検出した状
態にあるかのいずれかが成立した場合に、一定時間だけ
引き延ばすことを条件に構成した。The undervoltage relay monitoring circuit according to claim 8 of the present invention is the undervoltage relay monitoring circuit according to claim 1, wherein the undervoltage relay having the phase voltage as an input detects the undervoltage for all three phases. It is configured under the condition that the voltage is extended for a certain period of time when either of the above conditions is satisfied or the undervoltage relay that receives the line voltage as an input detects all three phases of the undervoltage.

【００４１】低感度の整定にある一方の不足電圧継電器
が復帰した後、残りの不足電圧継電器の不足電圧の検出
状態が３相で不揃いとなる電圧値で暫く電圧が停滞して
も、監視不良を検出する所定時限の確認を一定時間の間
は阻止する。After one of the undervoltage relays in the settling with low sensitivity is restored, the remaining undervoltage relays are not monitored even if the voltage is stagnated for a while at a voltage value at which the detection state of the undervoltage is uneven in three phases. Confirmation of a predetermined time period for detecting is blocked for a certain period of time.

【００４２】本発明の請求項９に係る不足電圧継電器の
監視回路は、請求項１において、所定時間の確認の阻止
条件を、相電圧を入力とする不足電圧継電器が３相とも
不足電圧を検出した状態にあるか、又は線間電圧を入力
とする不足電圧継電器が３相とも不足電圧を検出した状
態にあるかのいずれかを一定時間だけ確認した後に、一
定時間だけ引き延ばすことを条件に構成した。The undervoltage relay monitoring circuit according to claim 9 of the present invention is the undervoltage relay monitoring circuit according to claim 1, wherein the undervoltage relay having the phase voltage as an input detects the undervoltage for all three phases. It is configured to extend for a certain period of time after confirming for a certain period of time whether it is in a state where it is in a state of being under-voltage or an undervoltage relay that inputs the line voltage is in a state where all three phases have detected an undervoltage. did.

【００４３】そして相電圧，線間電圧のいずれかが一定
時間以上低下したことを確認の後、電圧が徐々に上昇し
いずれか一方の不足電圧継電器が復帰し、更に電圧が上
昇し残りの不足電圧継電器の不足電圧の検出状態が３相
不揃いとなる電圧値で、暫く停滞しても、監視不良を検
出する所定時限の確認を一定時間の間は阻止する。After confirming that either the phase voltage or the line voltage has dropped for a certain period of time or more, the voltage gradually rises and one of the undervoltage relays recovers, and the voltage further rises and the remaining shortage occurs. The voltage value at which the undervoltage detection state of the voltage relay is uneven in three phases, and even if the voltage is stagnated for a while, confirmation of a predetermined time period for detecting a monitoring failure is blocked for a certain period of time.

【００４４】本発明の請求項１０に係る不足電圧継電器
の監視回路は、請求項５において、所定時間の確認の阻
止条件を、不足電圧継電器が３相とも不足電圧を検出し
たことを記憶し、前記不足電圧継電器が３相とも不足電
圧を検出していないことにより前記記憶を解除するよう
に構成した。According to a tenth aspect of the present invention, in the monitoring circuit of the undervoltage relay according to the fifth aspect, the condition for preventing confirmation of a predetermined time is stored by the undervoltage relay detecting that all three phases have detected the undervoltage. The memory is released when the undervoltage relay does not detect an undervoltage in all three phases.

【００４５】そして３相の不足電圧継電器が３相とも不
足電圧を検出したことを条件に一旦これを保持し、３相
の不足電圧継電器が全て不足電圧を検出しなくなるまで
は保持を継続して、監視不良を検出する所定時限の確認
を阻止する。Then, the three-phase undervoltage relay is once held under the condition that all three phases have detected the undervoltage, and is maintained until all the three-phase undervoltage relays detect no undervoltage. , Blocking confirmation for a predetermined time period for detecting a monitoring failure.

【００４６】本発明の請求項１１に係る不足電圧継電器
の監視回路は、請求項５において、所定時間の確認の阻
止条件を、前記不足電圧継電器が３相とも不足電圧を検
出したことを一定時間だけ確認した後に記憶し、前記不
足電圧継電器が３相とも不足電圧を検出していないこと
により前記記憶を解除するように構成した。The monitoring circuit for an undervoltage relay according to claim 11 of the present invention is the monitoring circuit according to claim 5, wherein the condition for preventing confirmation of a predetermined time is that the undervoltage relay detects undervoltage for all three phases for a certain time. It is stored after confirming only the above, and the memory is released when the undervoltage relay does not detect an undervoltage in all three phases.

【００４７】そして３相の不足電圧継電器が３相とも不
足電圧を一定時間以上検出したことを条件にこれを一旦
保持し、この不足電圧継電器が３相とも不足電圧を検出
しなくなるまでは保持を継続して監視不良を検出する所
定限時の確認を阻止する。Then, the three-phase undervoltage relay is temporarily held under the condition that all three phases have detected the undervoltage for a certain time or more, and is held until the three-phase undervoltage relay stops detecting the undervoltage for all three phases. Prevents confirmation of a predetermined time limit for continuously detecting monitoring failure.

【００４８】本発明の請求項１２に係る不足電圧継電器
の監視回路は、３相に設けた相電圧を入力とする不足電
圧継電器あるいは線間電圧を入力とする不足電圧継電器
のいずれかの相の出力又はこれに応動する補助継電器の
接点出力が、所定時間以上にわたって不足電圧を検出し
た状態にあることを確認して当該継電器の不良と判定す
る不足電圧継電器の監視回路において、前記相電圧を入
力とする不足電圧継電器及び線間電圧を入力とする不足
電圧継電器のいずれもが３相とも不足電圧を検出した状
態にあるか、又は所定時間内における電圧の変化が所定
量以上であることを検出して一定時間だけ引き延ばした
状態にあるかのいずれかの条件で、前記所定時間の確認
を阻止させるよう構成した。According to a twelfth aspect of the present invention, there is provided an undervoltage relay monitoring circuit, which is provided for three phases of an undervoltage relay inputting a phase voltage or an undervoltage relay inputting a line voltage. Input the phase voltage in the monitoring circuit of the undervoltage relay that confirms that the output or the contact output of the auxiliary relay responding to this is in the state of detecting the undervoltage for a predetermined time or longer. It is detected that both the undervoltage relay and the undervoltage relay that inputs the line voltage are in the state of detecting the undervoltage in all three phases, or that the change of the voltage within the predetermined time is more than the predetermined amount. Then, the confirmation for the predetermined time is prevented under any condition that the condition is extended for a predetermined time.

【００４９】そして線間電圧，相電圧ともに３相とも低
下している間及び所定時間内に電圧が一定値以上変化し
ている間及びこの変化が停滞してから一定時間の間は、
監視不良を検出するして時限の確認を阻止する。Then, while both the line voltage and the phase voltage decrease in all three phases, the voltage changes by a certain value or more within a predetermined time, and the fixed time after the change stops,
Prevents timed confirmation by detecting poor monitoring.

【００５０】本発明の請求項１３に係る不足電圧継電器
の監視回路は、３相に設けた不足電圧継電器のいずれか
の相の出力又はこれに応動する補助継電器の出力接点
が、所定時間以上にわたって不足電圧を検出した状態に
あることを確認して、当該継電器の不良と判定する不足
電圧継電器の監視回路において、前記不足電圧継電器が
３相とも不足電圧を検出した状態にあるか又は所定時間
内における電圧の変化が所定量以上であることを検出し
て一定時間だけ引き延ばした状態にあるかのいずれかの
条件で、前記所定時間の確認を阻止させるよう構成し
た。According to a thirteenth aspect of the present invention, there is provided an undervoltage relay monitoring circuit, wherein an output of any one of the undervoltage relays provided in three phases or an output contact of an auxiliary relay responding to the output is provided for a predetermined time or more. In the monitoring circuit of the undervoltage relay, which confirms that the undervoltage is detected and determines that the relay is defective, the undervoltage relay is in a state where all three phases have detected the undervoltage, or within a predetermined time. The confirmation of the predetermined time is prevented under any condition that the change in the voltage at 1 is detected to be equal to or more than a predetermined amount and the voltage is extended for a predetermined time.

【００５１】そして３相の不足電圧継電器が３相とも不
足電圧を検出している間及び所定時間内に電圧が一定値
以上変化している間及びこの変化が停滞してから一定時
間の間は、監視不良を検出する所定時限の確認を阻止す
る。Then, while the three-phase undervoltage relay detects undervoltage in all three phases, while the voltage is changing by a certain value or more within a predetermined time, and during a certain time after the change is stopped. , Blocking confirmation for a predetermined time period for detecting a monitoring failure.

【００５２】本発明の請求項１４に係る不足電圧継電器
の監視回路は、請求項２において、所定時間の確認の阻
止条件の１つである電圧の変化に関する条件は、所定時
間内における電圧の変化が所定量以上であることを一定
時間だけ確認した後に、一定時間だけ引き延ばすように
構成した。According to a fourteenth aspect of the present invention, in the undervoltage relay monitoring circuit of the present invention, in the second aspect, the condition regarding the voltage change, which is one of the check conditions for confirming the predetermined time, is the change of the voltage within the predetermined time. Was confirmed to be not less than a predetermined amount for a certain period of time, and then extended for a certain period of time.

【００５３】そして線間電圧，相電圧ともに３相とも低
下している間及び所定時間内に電圧が一定値以上変化し
ていることを一定時間確認をした後に、続いて変化して
いる間及びこの変化が停滞してから一定時間の間は、監
視不良を検出する所定時間の確認を阻止する。Then, while both the line voltage and the phase voltage decrease in all three phases, and after confirming for a certain time that the voltage has changed by a certain value or more within a predetermined time, while the voltage continues to change, For a certain period of time after this change has stagnated, confirmation of a predetermined period of time for detecting a monitoring failure is blocked.

【００５４】本発明の請求項１５に係る不足電圧継電器
の監視回路は、請求項１３において、所定時間の確認の
阻止条件の１つである電圧の変化に関する条件は、所定
時間内における電圧の変化が所定量以上であることを一
定時間だけ確認した後に、一定時間だけ引き延ばすよう
に構成した。According to a fifteenth aspect of the present invention, in the undervoltage relay monitoring circuit according to the thirteenth aspect, the condition regarding the voltage change, which is one of the check conditions for the predetermined time, is the change in the voltage within the predetermined time. Was confirmed to be not less than a predetermined amount for a certain period of time, and then extended for a certain period of time.

【００５５】そして３相の不足電圧継電器が３相とも不
足電圧を検出している間及び所定時間内に電圧が一定値
以上変化していることを一定時間確認した後に続いて変
化している間及びこの変化が停滞してから一定時間の間
は、監視不良を検出する所定時限の確認を阻止する。While the three-phase undervoltage relay detects the undervoltages in all three phases, and while the voltage is changing for a certain period of time after confirming that the voltage has changed by a certain value or more within a predetermined time, the voltage continuously changes. Also, for a certain period of time after this change has stagnated, confirmation at a predetermined time period for detecting a monitoring failure is blocked.

【００５６】[0056]

【発明の実施の形態】以下図面を参照して実施例を説明
する。図１は本発明の請求項１に係る不足電圧継電器の
監視回路の一実施例の構成図である。図１において図16
と同一部分については同一符号を付して説明を省略す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. 1 is a block diagram of an embodiment of a monitoring circuit for an undervoltage relay according to claim 1 of the present invention. 16 in FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof is omitted.

【００５７】図１に示すブロック図の構成上記の特徴
は、各線間電圧を入力とする不足電圧継電器１Ａ，１
Ｂ，１Ｃ及び相電圧を入力とする不足電圧継電器２Ａ，
２Ｂ，２Ｃの出力を、夫々ＡＮＤ回路40，ＡＮＤ回路41
に接続し、更にこれらの出力をＯＲ回路14を介してＮＯ
Ｔ回路51へ入力したことにある。なお、その他の構成は
図16と同様である。Structure of Block Diagram Shown in FIG. 1 The above-mentioned characteristic is that the undervoltage relays 1A, 1 which receive each line voltage as an input.
B, 1C and undervoltage relay 2A with phase voltage as input,
The outputs of 2B and 2C are supplied to AND circuit 40 and AND circuit 41, respectively.
To the output of the OR circuit 14
It is input to the T circuit 51. The rest of the configuration is the same as in FIG.

【００５８】次に請求項１に係る不足電圧継電器の監視
回路の作用について説明する。系統事故時及び継電器不
良時の応動については図16の説明と同様である。停電時
の応動では、不足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，
２Ｂ，２Ｃが動作するのでＡＮＤ回路40，41、ＯＲ回路
14が成立して、ＮＯＴ回路51によりＡＮＤ回路42を阻止
するため、動作遅延回路61は出力を生じない。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 1 will be described. The response at the time of system failure and at the time of relay failure is the same as the explanation of Fig. 16. In response to a power failure, undervoltage relays 1A, 1B, 1C, 2A,
Since 2B and 2C operate, AND circuits 40 and 41, OR circuit
Since 14 is satisfied and the NOT circuit 51 blocks the AND circuit 42, the operation delay circuit 61 does not generate an output.

【００５９】図19（ａ）に示すように不足電圧継電器の
入力電圧が緩やかに上昇する場合は、ｔ1 時刻で不足電
圧継電器１Ａ，１Ｂ，１Ｃが復帰するとＡＮＤ回路40は
不成立となるが、ＡＮＤ回路41は成立したままであり、
ＮＯＴ回路51によりＡＮＤ回路42は阻止される。時刻ｔ
2 以降では不足電圧継電器２Ａ，２Ｂ，２Ｃも復帰して
ＡＮＤ回路41が不成立となるが、ＯＲ回路13も不成立で
あり、監視不良を検出することはない。When the input voltage of the undervoltage relay gradually rises as shown in FIG. 19A, when the undervoltage relays 1A, 1B and 1C recover at time t 1 , the AND circuit 40 is not established. The AND circuit 41 remains established,
The AND circuit 42 is blocked by the NOT circuit 51. Time t
After 2 , the undervoltage relays 2A, 2B, 2C are also restored and the AND circuit 41 is not established, but the OR circuit 13 is also not established and no monitoring failure is detected.

【００６０】上記した請求項１に係る不足電圧継電器の
監視回路によれば、不足電圧継電器の入力電圧が発電機
の出力電圧を徐々に上昇する試験等により緩変化を生じ
る場合に、相電圧を入力する不足電圧継電器と線間電圧
を入力する不足電圧継電器の不足電圧を検出する状態が
不揃いになっても、いずれか感度の高い方の不足電圧継
電器が３相とも不足電圧を検出している条件により、監
視不良の判定時間の確認を阻止することができ、監視不
良を不要に検出することはない。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 1, when the input voltage of the undervoltage relay causes a gradual change due to a test such as gradually increasing the output voltage of the generator, the phase voltage is changed. Even if the state of detecting the undervoltage of the input undervoltage relay and the undervoltage relay of inputting the line voltage becomes uneven, the undervoltage relay with the higher sensitivity detects the undervoltage for all three phases. Depending on the conditions, it is possible to prevent the confirmation time of the monitoring failure determination time from being checked, and the monitoring failure is not unnecessarily detected.

【００６１】図２は本発明の請求項２に係る不足電圧継
電器の監視回路の実施例の構成図である。図２におい
て、図１と同一部分には同一符号を付して説明を省略す
る。図２に示すブロック図の構成上の特徴は、ＡＮＤ回
路40の出力はＮＯＴ回路51を介してＡＮＤ回路42へ、
又、ＡＮＤ回路41の出力はＮＯＴ回路52を介してＡＮＤ
回路43へ接続し、これらＡＮＤ回路42，ＡＮＤ回路43の
他の入力には夫々補助継電器接点31a ，32a を夫々接続
し、ＡＮＤ回路42，43の出力はＯＲ回路13を介して動作
遅延回路61へ接続することにある。FIG. 2 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 2 of the present invention. 2, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The structural feature of the block diagram shown in FIG. 2 is that the output of the AND circuit 40 is passed through the NOT circuit 51 to the AND circuit 42,
The output of the AND circuit 41 is ANDed via the NOT circuit 52.
Auxiliary relay contacts 31a and 32a are connected to the other inputs of the AND circuit 42 and the AND circuit 43, respectively, and the outputs of the AND circuits 42 and 43 are connected to the operation delay circuit 61 via the OR circuit 13. To connect to.

【００６２】次に請求項２に係る不足電圧継電器の監視
回路の作用について説明する。系統事故時及び継電器不
良時の応動については図１のＯＲ回路13，ＡＮＤ回路4
2，43の位置が異なるのみであり、その応動は同様とな
るため説明は省略する。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 2 will be described. Regarding the response at the time of system failure and at the time of relay failure, OR circuit 13 and AND circuit 4 in FIG.
Only the positions of 2 and 43 are different, and the response is the same, so the description is omitted.

【００６３】停電時の応動では、ＡＮＤ回路40，41が共
に成立しＮＯＴ回路51，52を介してＡＮＤ回路42，43を
阻止するので、ＯＲ回路13も不成立となり動作遅延回路
61は出力を生じない。In response to a power failure, the AND circuits 40 and 41 are both established and the AND circuits 42 and 43 are blocked via the NOT circuits 51 and 52. Therefore, the OR circuit 13 is also not established and the operation delay circuit
61 produces no output.

【００６４】図19（ａ）に示す電圧が不足電圧継電器へ
入力された場合は、ｔ1 時刻で不足電圧継電器１Ａ，１
Ｂ，１Ｃが復帰するので、ＡＮＤ回路40が復帰してＮＯ
Ｔ回路51が成立しＡＮＤ回路42を成立させるが、補助継
電器31も復帰するので接点31a が復帰しＡＮＤ回路42を
阻止する。When the voltage shown in FIG. 19 (a) is input to the undervoltage relay, the undervoltage relays 1A, 1 at t 1 time.
Since B and 1C are restored, the AND circuit 40 is restored and NO
Although the T circuit 51 is established and the AND circuit 42 is established, since the auxiliary relay 31 is also restored, the contact 31a is restored and the AND circuit 42 is blocked.

【００６５】このため動作遅延回路61は出力を生じず監
視不良は生じない。時刻ｔ2 では不足電圧継電器２Ａ，
２Ｂ，２Ｃが復帰して、上記の不足電圧継電器１Ａ，１
Ｂ，１Ｃの場合と同様の応動を示すので監視不良は生じ
ない。For this reason, the operation delay circuit 61 does not produce an output and no monitoring failure occurs. At time t 2 , the undervoltage relay 2A,
2B, 2C are restored, and the above-mentioned undervoltage relays 1A, 1
Since the same response as in the cases of B and 1C is shown, no monitoring failure occurs.

【００６６】上記した請求項２に係る不足電圧継電器の
監視回路によれば、不足電圧継電器の入力電圧が上記の
緩変化を生じる場合に、相電圧を入力する不足電圧継電
器と線間電圧を入力する不足電圧継電器の不足電圧を検
出する状態が不揃いになっても、以下のように監視不良
を誤検出することはない。According to the undervoltage relay monitoring circuit of the second aspect, when the input voltage of the undervoltage relay causes the above-mentioned slow change, the undervoltage relay for inputting the phase voltage and the line voltage are input. Even if the state of detecting the undervoltage of the undervoltage relay becomes irregular, the monitoring failure will not be erroneously detected as described below.

【００６７】つまり、相電圧を入力とする不足電圧継電
器の監視については相電圧を入力とする不足電圧継電器
が３相とも不足電圧を検出している条件により、線間電
圧を入力とする不足電圧継電器の監視については線間電
圧を入力とする不足電圧継電器が３相とも不足電圧を検
出している条件により監視不良の判定時間の確認を阻止
することができ、監視不良を不要に検出することはな
い。That is, regarding the monitoring of the undervoltage relay having the phase voltage as the input, the undervoltage relay having the line voltage as the input is used depending on the condition that the undervoltage relay having the phase voltage as the input detects the undervoltage in all three phases. Regarding the monitoring of the relay, it is possible to prevent the monitoring failure judgment time from being confirmed unnecessarily by the condition that the undervoltage relay that receives the line voltage as the input detects the undervoltage in all three phases. There is no.

【００６８】図３は本発明の請求項３に係る不足電圧継
電器の監視回路の実施例の構成図である。図３において
図16と同一部分には同一符号を付して説明を省略する。
図３に示すブロック図の構成上の特徴は、ＡＮＤ回路41
とＮＯＴ回路51の間に復帰遅延回路71を追加したことに
ある。その他の構成は図16と同様である。FIG. 3 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 3 of the present invention. In FIG. 3, the same parts as those in FIG. 16 are designated by the same reference numerals and the description thereof will be omitted.
The structural feature of the block diagram shown in FIG.
This is because a return delay circuit 71 is added between the NOT circuit 51 and the NOT circuit 51. Other configurations are the same as those in FIG.

【００６９】次に請求項３に係る不足電圧継電器の監視
回路の作用について説明する。系統事故時及び継電器不
良時の応動及び停電時の応動については図16の説明と同
様である。図19（ａ）に示す電圧が不足電圧継電器に入
力された場合、ｔ1 時刻で不足電圧継電器１Ａ，１Ｂ，
１Ｃが復帰してＡＮＤ回路41が不成立となるが、復帰遅
延回路71はその出力をＬＴ時間継続して、ＮＯＴ回路51
を介してＡＮＤ回路42を阻止できる。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 3 will be described. The response at the time of system accident and relay failure and at the time of power failure is the same as the explanation of FIG. If the voltage shown in FIG. 19 (a) is inputted to the under voltage relay, undervoltage relay 1A at t 1 time, 1B,
Although 1C is restored and the AND circuit 41 is not established, the restoration delay circuit 71 continues its output for the LT time and the NOT circuit 51.
The AND circuit 42 can be blocked via.

【００７０】試験時の電圧上昇に要する時間の場合は、
予め判明しているので時刻ｔ1 からｔ2 に要する時間も
求められる。従って、復帰遅延時間ＬＴを、ｔ2 −ｔ1
の時間より長く設定して監視不良を阻止し、時刻ｔ2 以
降は不足電圧継電器２Ａ，２Ｂ，２Ｃが復帰して監視不
良を阻止する。In the case of the time required to increase the voltage during the test,
Since it is known in advance, the time required from time t 1 to t 2 can also be obtained. Therefore, the return delay time LT is t 2 −t 1
Is set to be longer than the time of 1 to prevent the monitoring failure, and after time t 2, the undervoltage relays 2A, 2B, 2C are restored to prevent the monitoring failure.

【００７１】３線短絡時にも不足電圧継電器１Ａ，１
Ｂ，１Ｃが動作してＡＮＤ回路41が成立するので、事故
回復後もＬＴ時間だけは不足電圧継電器の監視を阻止す
ることになるが、この期間は装置の運用期間に比べると
極めて短期間である。Undervoltage relays 1A, 1 even when the three wires are short-circuited
Since B and 1C operate and the AND circuit 41 is established, the monitoring of the undervoltage relay is blocked only for the LT time even after the accident recovery, but this period is extremely short compared with the operation period of the device. is there.

【００７２】上記した請求項３に係る不足電圧継電器の
監視回路によれば、不足電圧継電器の入力が上記の緩変
化を生じる場合に、相電圧を入力とする不足電圧継電器
と線間電圧を入力とする不足電圧継電器の不足電圧を検
出する状態が不揃いになっても、以下のように監視不良
を検出することはない。According to the undervoltage relay monitoring circuit of the third aspect, when the input of the undervoltage relay causes the above-mentioned slow change, the undervoltage relay having the phase voltage as the input and the line voltage are input. Even if the state of detecting the undervoltage of the undervoltage relay is uneven, the monitoring failure is not detected as described below.

【００７３】即ち、これら不足電圧継電器のいずれもが
３相とも不足電圧を検出していたことを一定時間だけ、
引き延ばした条件により、監視不良の判定時間の確認を
阻止することができ、監視不良を不要に検出することは
ない。That is, it is confirmed that all of these undervoltage relays detected the undervoltage in all three phases for a certain period of time.
Due to the extended condition, it is possible to prevent confirmation of the monitoring failure determination time, and the monitoring failure is not unnecessarily detected.

【００７４】図４は本発明の請求項４に係る不足電圧継
電器の監視回路の実施例の構成図である。図４において
図３と同一部分には同一符号を付して説明を省略する。
図４に示すブロック図の構成上の特徴は、復帰遅延回路
71の前段に動作遅延回路62を追加したことにある。その
他の構成は図３と同様である。FIG. 4 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 4 of the present invention. 4, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.
The structural characteristic of the block diagram shown in FIG.
This is because the operation delay circuit 62 is added to the stage before 71. Other configurations are the same as those in FIG.

【００７５】次に請求項４に係る不足電圧継電器の監視
回路の作用について図３との相違を説明する。図３では
３線短絡時に不足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，
２Ｂ，２Ｃが動作し、即座に復帰遅延回路71が動作した
のに対し、図４では通常の事故除去時間以上に動作遅延
回路62の限時を設定しているので、所定時間以内に事故
除去されれば、不足電圧継電器１Ａ，１Ｂ，１Ｃが復帰
し、遅延回路62は出力を生じないので、復帰遅延回路71
によるＬＴ時間の監視の阻止も生じない。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 4 will be described by referring to differences from FIG. In Fig. 3, undervoltage relays 1A, 1B, 1C, 2A,
2B and 2C operate, and the recovery delay circuit 71 operates immediately, whereas in FIG. 4, the time delay of the operation delay circuit 62 is set to be longer than the normal accident elimination time, so the accident elimination is performed within a predetermined time. If so, the undervoltage relays 1A, 1B, 1C are restored, and the delay circuit 62 does not produce an output, so the restoration delay circuit 71
There is no blocking of LT time monitoring by.

【００７６】上記した請求項４に係る不足電圧継電器の
監視回路によれば、相電圧を入力とする不足電圧継電器
及び線間電圧を入力とする不足電圧継電器のいずれもが
３相とも不足電圧を検出したことを一定時間だけ確認し
た後に一定時間だけ引き延ばした条件により監視不良の
判定時間の確認を阻止しているので、前記請求項３の効
果に加え、系統事故時においても上記の監視不良の判定
時間の確認を阻止することが生じず、速やかに監視不良
を検出できる。According to the above-mentioned undervoltage relay monitoring circuit of claim 4, both of the undervoltage relay having the phase voltage as an input and the undervoltage relay having the line voltage as an input generate the undervoltage in all three phases. In addition to the effect of claim 3, in addition to the effect of claim 3, the above-mentioned monitoring failure can be confirmed even if a system fault occurs because the detection time is checked for a certain time and then extended for a certain time. The monitoring failure can be detected promptly without blocking the confirmation of the determination time.

【００７７】図５は請求項５に係る不足電圧継電器の監
視回路の実施例の構成図である。図５において図18と同
一部分には同一符号を付して説明を省略する。図５に示
すブロック図の構成上の特徴は、ＮＯＴ回路51の前段に
復帰遅延回路71を追加したことにある。その他の構成は
図18と同様である。FIG. 5 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 5. 5, the same parts as those in FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. A structural feature of the block diagram shown in FIG. 5 is that a return delay circuit 71 is added to the previous stage of the NOT circuit 51. Other configurations are the same as those in FIG.

【００７８】次に請求項５に係る不足電圧継電器の監視
回路の作用について説明する。系統事故時及び継電器不
良時の応動については図18の説明と同様である。ここで
図19（ｂ）に示す電圧が不足電圧継電器に入力された場
合、ｔ3 時刻でしばらく電圧の上昇が停滞し、３相の不
足電圧継電器１Ａ，１Ｂ，１Ｃが不揃いに不足電圧を検
出した状態になると、ＡＮＤ回路41が不成立となる。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 5 will be described. The response at the time of system failure and at the time of relay failure is the same as the explanation of FIG. Here, when the voltage shown in FIG. 19 (b) is input to the undervoltage relay, the increase in the voltage stagnates for a while at time t 3 , and the three-phase undervoltage relays 1A, 1B, 1C detect the undervoltage unevenly. When it becomes the state, the AND circuit 41 is not established.

【００７９】この後、復帰遅延回路71の限時ＬＴ時間は
ＮＯＴ回路51を介してＡＮＤ回路42を阻止できる。その
後再び電圧上昇を開始し、ｔ4 時刻以降では不足電圧継
電器１Ａ，１Ｂ，１Ｃは３相とも復帰するので、補助継
電器31が設定31a を開き、ＡＮＤ回路42を阻止して監視
不良を生じない。Thereafter, the time delay LT time of the return delay circuit 71 can be blocked by the AND circuit 42 via the NOT circuit 51. After that, the voltage starts to rise again, and after time t 4 , all three phases of the undervoltage relays 1A, 1B and 1C are restored, so that the auxiliary relay 31 opens the setting 31a and blocks the AND circuit 42 to prevent the monitoring failure. .

【００８０】即ち、試験時に予め決めた電圧上昇を行な
う際に、時刻ｔ4 −ｔ3 の時間以上に復帰遅延回路71の
限時ＬＴを設定すれば、不足電圧継電器の検出感度付近
での電圧のしばらくの停滞があったとしても、監視不良
を生じない。That is, if the time delay LT of the return delay circuit 71 is set to be longer than the time t 4 -t 3 when performing a predetermined voltage rise during the test, the voltage near the detection sensitivity of the undervoltage relay will be increased. Even if there is a stagnation for a while, the poor monitoring does not occur.

【００８１】一方、３線短絡時にも不足電圧継電器１
Ａ，１Ｂ，１Ｃが動作してＡＮＤ回路41が成立するの
で、事故回復後も復帰遅延回路71の限時ＬＴ時間だけは
不足電圧継電器の監視を阻止することになるが、この期
間は装置の運用期間と比較して短期間であり全体の信頼
性に与える影響は小さい。On the other hand, undervoltage relay 1 even when the three wires are short-circuited
Since A, 1B, and 1C operate and the AND circuit 41 is established, the monitoring of the undervoltage relay is blocked only by the time delay LT time of the recovery delay circuit 71 even after the accident recovery, but during this period, operation of the device is performed. The period is short compared to the period and the impact on the overall reliability is small.

【００８２】上記した請求項５に係る不足電圧継電器の
監視回路によれば、不足電圧継電器の入力電圧が、発電
機の出力電圧を徐々に上昇する試験等により緩やかに上
昇し、途中の電圧でしばらく停滞した後に再び緩やかに
上昇する場合であっても、以下のように監視不良を検出
することはない。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 5, the input voltage of the undervoltage relay is gradually increased by a test or the like in which the output voltage of the generator is gradually increased, and the voltage in the middle is increased. Even if the stagnation is continued for a while and then the gradual increase again, the monitoring failure is not detected as described below.

【００８３】即ち、しばらく停滞した電圧において不足
電圧継電器の３相の不足電圧の検出状態が不揃いになっ
ても、３相とも不足電圧を検出していたことを一定時間
だけ引き延ばした条件により、監視不良の判定時間の確
認を阻止することができ、監視不良を不要に検出するこ
とはない。That is, even if the three-phase undervoltage detection states of the three-phase undervoltage relay become uneven when the voltage is stagnant for a while, it is monitored by the condition that the undervoltage is detected for all three phases for a certain period of time. It is possible to prevent confirmation of the defect determination time, and it is possible to prevent unnecessary detection of monitoring defects.

【００８４】図６は本発明の請求項６に係る不足電圧継
電器の監視回路の実施例の構成図である。図６において
図５と同一部分には同一符号を付してその説明を省略す
る。図６に示すブロック図の構成上の特徴は、復帰遅延
回路71の前段に動作遅延回路62を追加していることにあ
る。FIG. 6 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 6 of the present invention. 6, the same parts as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. A structural feature of the block diagram shown in FIG. 6 is that an operation delay circuit 62 is added to the preceding stage of the return delay circuit 71.

【００８５】次に請求項６に係る不足電圧継電器の監視
回路の作用について図５との相違を説明する。図５では
３線短絡時に不足電圧継電器１Ａ，１Ｂ，１Ｃが動作
し、即座に復帰遅延回路71が動作したのに対して、図６
では通常の事故除去で不足電圧継電器１Ａ，１Ｂ，１Ｃ
が動作継続している時間以上に動作遅延回路62の限時を
設定している。従って、所定時間以内に事故除去されれ
ば動作遅延回路62は出力を生じることはないので、復帰
遅延回路71によるＬＴ時間の監視の阻止も生じない。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 6 will be described by referring to differences from FIG. In FIG. 5, the undervoltage relays 1A, 1B and 1C were activated when the three wires were short-circuited, and the restoration delay circuit 71 was immediately activated, whereas in FIG.
Under normal voltage removal, then undervoltage relays 1A, 1B, 1C
The time limit of the operation delay circuit 62 is set to be longer than the time when the operation continues. Therefore, if the accident is removed within a predetermined time, the operation delay circuit 62 does not produce an output, so that the recovery delay circuit 71 does not prevent the LT time from being monitored.

【００８６】上記した請求項６に係る不足電圧継電器の
監視回路によれば、不足電圧継電器が３相とも不足電圧
を検出したことを一定時間だけ確認した後に、一定時間
だけ引き延ばした条件により監視不良の判定時間の確認
を阻止しているので、前記図５の効果に加え、系統事故
時においても上記の監視不良の判定時間の確認を阻止す
ることが生じず、速やかに監視不良を検出できる。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 6, after confirming that the undervoltage relay has detected the undervoltage in all three phases for a certain time, the monitoring failure is caused by the condition of extending the voltage for a certain time. Since the confirmation of the determination time is blocked, the monitoring failure can be promptly detected without blocking the confirmation failure determination time described above even in the event of a system fault.

【００８７】図７は本発明の請求項７に係る不足電圧継
電器の監視回路の実施例の構成図である。図７において
図１と同一部分には同一符号を付してその説明を省略す
る。図７に示すブロック図の構成上の特徴はＮＯＴ回路
51の前段にフリップフロップ回路81を設け、そのリセッ
ト条件に不足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，２
Ｂ，２Ｃの出力をＯＲ回路15を経由の上、ＮＯＴ回路53
を介して接続したことにある。FIG. 7 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 7 of the present invention. 7, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The NOT circuit is the structural feature of the block diagram shown in FIG.
A flip-flop circuit 81 is provided in front of 51, and its reset condition is set to an undervoltage relay 1A, 1B, 1C, 2A, 2
The outputs of B and 2C are passed through the OR circuit 15 and then the NOT circuit 53
It has been connected through.

【００８８】次に請求項７に係る不足電圧継電器の監視
回路の作用について説明する。フリップフロップ回路81
はセット端子（Ｓ）に入力が与えられると、リセット
（Ｒ）に入力が与えられるまでその出力端子（Ｑ）より
出力を生じる記憶回路である。従って、系統事故時及び
継電器不良時の応動は図１の説明と同様である。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 7 will be described. Flip-flop circuit 81
Is a memory circuit which, when an input is given to the set terminal (S), produces an output from its output terminal (Q) until an input is given to the reset (R). Therefore, the response at the time of system failure and at the time of relay failure is the same as that of the description of FIG.

【００８９】又、図19（ｂ）に示す電圧が不足電圧継電
器に入力された場合は、ｔ3 時刻以前では不足電圧継電
器１Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃが動作してＡＮ
Ｄ回路41，ＯＲ回路15とも成立するので、フリップフロ
ップ回路81のＳ端子に入力が与えられ、ＮＯＴ回路53を
介してフリップフロップ回路81のＲ端子には入力は与え
られない。When the voltage shown in FIG. 19 (b) is input to the undervoltage relay, the undervoltage relays 1A, 1B, 1C, 2A, 2B and 2C operate before the time t 3 and the AN operates.
Since both the D circuit 41 and the OR circuit 15 are established, an input is given to the S terminal of the flip-flop circuit 81, and no input is given to the R terminal of the flip-flop circuit 81 via the NOT circuit 53.

【００９０】これによりフリップフロップ回路81のＱ端
子に出力が生じＮＯＴ回路51を介してＡＮＤ回路42を阻
止して動作遅延回路61の監視不良出力を生じない。ｔ4
時刻においては不足電圧継電器１Ａ，１Ｂ，１Ｃ，２
Ａ，２Ｂ，２Ｃのいずれかは復帰し、いずれかは動作し
てＡＮＤ回路41は不成立となるがＯＲ回路15は成立して
いる。As a result, an output is generated at the Q terminal of the flip-flop circuit 81, and the AND circuit 42 is blocked via the NOT circuit 51, and the monitoring failure output of the operation delay circuit 61 is not generated. t 4
Undervoltage relays 1A, 1B, 1C, 2 at time
Any one of A, 2B, and 2C is restored, and any one of them operates and the AND circuit 41 is not established, but the OR circuit 15 is established.

【００９１】従って、ＮＯＴ回路51を介したフリップフ
ロップ回路81のＲ端子に入力は与えられず、Ｑ端子の出
力は生じたままとなる。この結果、ＡＮＤ回路42は阻止
されたままであり、監視不良は生じない。Therefore, no input is given to the R terminal of the flip-flop circuit 81 via the NOT circuit 51, and the output of the Q terminal remains generated. As a result, the AND circuit 42 remains blocked and no monitoring failure occurs.

【００９２】ｔ2 時刻において、仮に電圧の上昇が停滞
して不足電圧継電器２Ａ，２Ｂ，２Ｃの３相出力に不揃
いを生じたとしても、補助継電器32を動作させてＡＮＤ
回路42へ監視用の信号を与えていても、ＯＲ回路15も成
立するので、フリップフロップ回路81のＱ端子の出力に
よりＮＯＴ回路51を介してＡＮＤ回路42を阻止して監視
不良を生じない。At time t 2 , even if the rise in voltage stagnates and the three-phase outputs of the undervoltage relays 2A, 2B, and 2C become irregular, the auxiliary relay 32 is operated and the AND operation is performed.
Even if the signal for monitoring is given to the circuit 42, the OR circuit 15 is also established, so that the output of the Q terminal of the flip-flop circuit 81 blocks the AND circuit 42 via the NOT circuit 51 and the monitoring failure does not occur.

【００９３】又、ＡＮＤ回路42の阻止条件として復帰遅
延回路を利用していないので、電圧上昇の停滞時間によ
らず、監視不良を阻止できる反面、不足電圧継電器１
Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃの復帰不良時には、
監視不良を阻止するという盲点を有しているが、この盲
点の発生確率は極めて小さい。Further, since the return delay circuit is not used as the blocking condition of the AND circuit 42, the monitoring failure can be blocked regardless of the stagnation time of the voltage rise, but the undervoltage relay 1
When the recovery failure of A, 1B, 1C, 2A, 2B, 2C,
Although it has a blind spot to prevent poor monitoring, the probability of occurrence of this blind spot is extremely low.

【００９４】上記した請求項７に係る不足電圧継電器の
監視回路によれば、不足電圧継電器の入力電圧が、徐々
に上昇し途中の電圧でしばらく停滞した後に再び上昇す
る変化を生じる場合に、相電圧を入力とする不足電圧継
電器及び線間電圧を入力とする不足電圧継電器のいずれ
もが３相とも不足電圧を検出していたことを記憶してい
る。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 7, when the input voltage of the undervoltage relay changes gradually and gradually changes and then stagnates at the intermediate voltage for a while and then rises again, the phase It is memorized that both the undervoltage relay which inputs the voltage and the undervoltage relay which inputs the line voltage detect the undervoltage in all three phases.

【００９５】しかもこれらの不足電圧継電器のいずれの
相も不足電圧を検出していないことにより、この記憶を
解除するように構成した条件により監視不良の判定時間
の確認を阻止することができ、監視不良を不要に検出す
ることはない。なお、本監視回路によれば、途中の電圧
の停滞時間には制約を与えない。Moreover, since the undervoltage is not detected in any of the phases of these undervoltage relays, it is possible to prevent the confirmation time of the monitoring failure from being confirmed by the condition configured to release the memory. Defects are not unnecessarily detected. According to this monitoring circuit, no restriction is imposed on the stagnation time of the voltage on the way.

【００９６】図８は本発明の請求項８に係る不足電圧継
電器の監視回路の一実施例の構成図である。図８におい
て図１と同一部分には同一符号を付してその説明を省略
する。図１に示すブロック図の構成上の特徴は、ＮＯＴ
回路51の前段に復帰遅延回路71を追加したことにある。FIG. 8 is a block diagram of an embodiment of a monitoring circuit of an undervoltage relay according to claim 8 of the present invention. 8, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The structural feature of the block diagram shown in FIG.
This is because a return delay circuit 71 was added to the previous stage of the circuit 51.

【００９７】次に請求項８に係る不足電圧継電器の監視
回路の作用について図１との相違を説明する。図１の回
路に図19（ｂ）の電圧が不足電圧継電器に入力され、ｔ
2 時刻で電圧上昇がしばらく停滞した場合を想定する
と、不足電圧継電器２Ａ，２Ｂ，２Ｃの３相の検出感度
の不揃いによりＡＮＤ回路41が不成立となりＡＮＤ回路
42の阻止ができず、動作遅延回路61が出力を生じて監視
不良に至ることが考えられる。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 8 will be described by referring to differences from FIG. The voltage of FIG. 19 (b) is input to the undervoltage relay in the circuit of FIG.
Assuming that the voltage rise has stagnated for a while at two times, the AND circuit 41 fails because the detection sensitivity of the three phases of the undervoltage relays 2A, 2B, 2C is not uniform, and the AND circuit 41 is not established.
It is conceivable that the operation delay circuit 61 produces an output and leads to monitoring failure due to failure in blocking 42.

【００９８】一方、図８の回路においては上記電圧の停
滞以上の時間に復帰遅延回路71の限時を設定することに
より、ＡＮＤ回路42の成立を阻止して動作遅延回路61が
出力を生じず、監視不良には至らない。On the other hand, in the circuit of FIG. 8, by setting the time limit of the return delay circuit 71 to a time longer than the voltage stagnation, the establishment of the AND circuit 42 is blocked and the operation delay circuit 61 does not produce an output. It does not lead to poor monitoring.

【００９９】上記した請求項８に係る不足電圧継電器の
監視回路によれば、相電圧を入力とする不足電圧継電器
が３相とも不足電圧を検出するか、又は線間電圧を入力
とする不足電圧継電器が３相とも不足電圧を検出するか
のいずれかを一定時間だけ延ばした条件により監視不良
の判定時間の確認を阻止することができる。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 8, the undervoltage relay which inputs the phase voltage detects the undervoltage in all three phases or the undervoltage which inputs the line voltage. It is possible to prevent confirmation of the monitoring failure determination time by the condition that any one of the three phases of the relay detecting the undervoltage is extended for a certain time.

【０１００】前記図１の効果に加え、電圧上昇の途中で
不足電圧継電器の３相が不足電圧を検出する状態が不揃
いになる電圧にしばらく停滞することがあっても、監視
不良を不要に検出することはない。In addition to the effect shown in FIG. 1, even if the three phases of the undervoltage relay are stagnation for a while during the voltage rise, the state of detecting the undervoltage is not uniform. There is nothing to do.

【０１０１】図９は本発明の請求項９に係る不足電圧継
電器の監視回路の一実施例の構成図である。図９におい
て図８と同一部分には同一符号を付してその説明を省略
する。図９に示すブロック図の構成上の特徴は、復帰遅
延回路71の前段に動作遅延回路62を追加したことにあ
る。FIG. 9 is a block diagram of an embodiment of a monitoring circuit for an undervoltage relay according to claim 9 of the present invention. 9, the same parts as those in FIG. 8 are designated by the same reference numerals and the description thereof will be omitted. The structural feature of the block diagram shown in FIG. 9 is that an operation delay circuit 62 is added to the preceding stage of the return delay circuit 71.

【０１０２】次に請求項９に係る不足電圧継電器の監視
回路の作用について図８との相違を説明する。図８では
３線短絡時に不足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，
２Ｂ，２Ｃが動作し、即座に復帰遅延回路71が動作する
ので事故回復後もその限時ＬＴ時間だけＡＮＤ回路42を
阻止したのに対して、図９では通常の事故発生除去の際
に不足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃ
が動作している時間以上に、動作遅延回路62の限時を設
定している。従って、所定時間以内に事故除去されれ
ば、動作遅延回路62は出力を生じることはないので、復
帰遅延回路71によるＬＴ時間の監視の阻止も生じない。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 9 will be described by referring to differences from FIG. In FIG. 8, undervoltage relays 1A, 1B, 1C, 2A,
2B and 2C operate and the recovery delay circuit 71 operates immediately, so the AND circuit 42 is blocked for the time limit LT time even after the accident recovery, whereas in FIG. Relays 1A, 1B, 1C, 2A, 2B, 2C
The time limit of the operation delay circuit 62 is set to be longer than the operating time. Therefore, if the accident is removed within a predetermined time, the operation delay circuit 62 does not produce an output, and therefore the monitoring of the LT time by the return delay circuit 71 does not occur.

【０１０３】上記した請求項９に係る不足電圧継電器の
監視回路によれば、相電圧を入力とする不足電圧継電器
が３相とも不足電圧を検出するか、又は線間電圧を入力
とする不足電圧継電器が３相とも不足電圧を検出するか
のいずれかの状態を一定時間だけ確認した後に、一定時
間だけ引き延ばした条件により監視不良の判定時間の確
認を阻止することができる。従って、前記請求項８の効
果に加え、系統事故時においても上記の監視不良の判定
時間の確認を阻止することが生じず、速やかに監視不良
を検出できる。According to the monitoring circuit for an undervoltage relay according to claim 9 described above, an undervoltage relay having a phase voltage as an input detects an undervoltage in all three phases, or an undervoltage having a line voltage as an input. It is possible to prevent confirmation of the monitoring failure determination time by checking the condition in which the relay detects an undervoltage in all three phases for a certain period of time and then extending the state for a certain period of time. Therefore, in addition to the effect of claim 8, the monitoring failure can be promptly detected without blocking the confirmation of the monitoring failure determination time even during a system fault.

【０１０４】図10は本発明の請求項１０に係る不足電圧
継電器の監視回路の一実施例の構成図である。図10にお
いて図18と同一部分には同一符号を付してその説明を省
略する。図10に示すブロック図の構成上の特徴は、ＮＯ
Ｔ回路51の前段にフリップフロップ回路81を設け、その
リセット条件に不足電圧継電器１Ａ，１Ｂ，１Ｃの出力
をＯＲ回路15を経由しＮＯＴ回路53を介して接続したこ
とにある。FIG. 10 is a block diagram of an embodiment of a monitoring circuit for an undervoltage relay according to claim 10 of the present invention. 10, the same parts as those in FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. The structural feature of the block diagram shown in FIG.
The flip-flop circuit 81 is provided in the preceding stage of the T circuit 51, and the outputs of the undervoltage relays 1A, 1B, and 1C are connected via the OR circuit 15 and the NOT circuit 53 to the reset condition.

【０１０５】次に請求項１０に係る不足電圧継電器の監
視回路の作用について説明する。フリップフロップ回路
81の動作は前述の図７の説明と同様であるので、系統事
故時及び継電器不良時の応動は図18の説明と同様とな
る。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 10 will be described. Flip-flop circuit
Since the operation of 81 is the same as that of the description of FIG. 7 described above, the response at the time of a system fault and the relay failure is the same as that of the description of FIG.

【０１０６】図19（ｂ）に示す電圧が不足電圧継電器に
入力された場合には、ｔ3 時刻以前では不足電圧継電器
１Ａ，１Ｂ，１Ｃが動作して、フリップフロップ回路81
のＳ端子へセット入力を与え、Ｒ端子のリセット入力は
与えないので、Ｑ端子の出力を生じてＮＯＴ回路51を介
してＡＮＤ回路42を阻止することにより監視不良を阻止
する。When the voltage shown in FIG. 19B is input to the undervoltage relay, the undervoltage relays 1A, 1B and 1C operate before the time t 3 and the flip-flop circuit 81
Since the set input is given to the S terminal and the reset input is not given to the R terminal, the output from the Q terminal is generated and the AND circuit 42 is blocked via the NOT circuit 51 to prevent the monitoring failure.

【０１０７】ｔ3 時刻で電圧の上昇が停滞して不足電圧
継電器１Ａ，１Ｂ，１Ｃの３相が不揃い動作になった場
合でも、ＯＲ回路15は成立したままであるため、ＮＯＴ
回路53の出力は生じず、フリップフロップ回路81はリセ
ットされないのでＱ端子の出力を生じたままとなり、Ａ
ＮＤ回路42を阻止する。Even when the voltage rise is stagnated at time t 3 and the three phases of the undervoltage relays 1A, 1B, and 1C are in an irregular operation, the OR circuit 15 is still established, and therefore NOT
Since the output of the circuit 53 is not generated and the flip-flop circuit 81 is not reset, the output of the Q terminal remains generated, and A
The ND circuit 42 is blocked.

【０１０８】ｔ4 時刻以降では不足電圧継電器１Ａ，１
Ｂ，１Ｃは３相とも復帰するのでＯＲ回路15が不成立と
なり、ＮＯＴ回路53を介してフリップフロップ回路81を
リセットしてＱ端子の出力が生じなくなり、ＡＮＤ回路
42の阻止を解除する。一方、補助継電器31も復帰するの
で、接点31a も開路しＡＮＤ回路42は不成立となって、
動作遅延回路61は出力を生じず監視不良は検出しない。After time t 4, undervoltage relays 1A, 1
Since the three phases of B and 1C are restored, the OR circuit 15 is not established, the flip-flop circuit 81 is reset through the NOT circuit 53, and the output of the Q terminal is not generated.
Unblock 42. On the other hand, since the auxiliary relay 31 is also restored, the contact 31a is also opened and the AND circuit 42 is not established,
The operation delay circuit 61 does not produce an output and does not detect a monitoring failure.

【０１０９】図10の回路ではＡＮＤ回路42の阻止条件と
して復帰遅延回路を利用していないので、電圧上昇の停
滞時間によらず監視不良を阻止できる反面、不足電圧継
電器１Ａ，１Ｂ，１Ｃのいずれかの復帰不良時でも監視
不良を阻止するという盲点を生じるが、この発生確率は
極めて小さい。In the circuit of FIG. 10, since the return delay circuit is not used as the blocking condition of the AND circuit 42, the monitoring failure can be blocked regardless of the stagnation time of the voltage rise, but any of the undervoltage relays 1A, 1B and 1C. Although a blind spot is generated even if the recovery fails, the occurrence probability is extremely small.

【０１１０】上記した請求項１０に係る不足電圧継電器
の監視回路によれば、不足電圧継電器が３相とも不足電
圧を検出していたことを記憶し、いずれの相も不足電圧
を検出していないことによりこの記憶を解除するように
構成した条件により、監視不良の判定時間の確認を阻止
することができる。According to the monitoring circuit of the undervoltage relay according to the tenth aspect, it is stored that the undervoltage relay has detected the undervoltage in all three phases, and the undervoltage is not detected in any of the phases. As a result, it is possible to prevent confirmation of the monitoring failure determination time under the condition that the storage is released.

【０１１１】従って電圧上昇の途中で不足電圧継電器の
３相が不揃い動作となる電圧で、電圧の停滞が生じたと
しても監視不良を不要に検出することはない。なお、本
監視回路によれば、途中の電圧の停滞時間には制約を与
えない。Therefore, even if a voltage stagnation occurs, the monitoring failure is not unnecessarily detected at a voltage at which the three phases of the undervoltage relay operate irregularly during the voltage rise. According to this monitoring circuit, no restriction is imposed on the stagnation time of the voltage on the way.

【０１１２】図11は本発明の請求項１１に係る不足電圧
継電器の監視回路の一実施例の構成図である。図11にお
いて図10と同一部分には同一符号を付してその説明を省
略する。図11に示すブロック図の構成上の特徴はフリッ
プフロップ回路81のＳ端子の前段に動作遅延回路62を追
加したことにある。FIG. 11 is a block diagram of an embodiment of a monitoring circuit for an undervoltage relay according to claim 11 of the present invention. 11, parts that are the same as those in FIG. 10 are given the same reference numerals, and descriptions thereof will be omitted. The structural feature of the block diagram shown in FIG. 11 is that an operation delay circuit 62 is added to the front stage of the S terminal of the flip-flop circuit 81.

【０１１３】次に請求項１１に係る不足電圧継電器の監
視回路の作用について図10との相違を説明する。図10に
おいてはフリップフロップ回路81のセットは、通常の３
線短絡事故で不足電圧継電器１Ａ，１Ｂ，１Ｃが動作し
た際にも行なわれるのに対し、図11では動作遅延回路62
の限時以上、不足電圧継電器１Ａ，１Ｂ，１Ｃが３相と
も動作した時に限られるため、フリップフロップ回路81
がセットされる確率は図10に比較して著しく小さくな
り、不足電圧継電器の復帰不良を検出できない確率は図
10に比較して更に小さくなる。Next, the operation of the monitoring circuit of the undervoltage relay according to the eleventh aspect of the present invention, which is different from that of FIG. 10, will be described. In FIG. 10, the flip-flop circuit 81 is set to a normal 3
While this is also performed when the undervoltage relays 1A, 1B, 1C operate due to a line short-circuit accident, the operation delay circuit 62 in FIG.
This is only when the three phases of the undervoltage relays 1A, 1B and 1C are operating for the time period of
The probability that is set is significantly smaller than that in Fig. 10, and the probability that an undervoltage relay recovery failure cannot be detected is
It will be even smaller than 10.

【０１１４】上記した請求項１１に係る不足電圧継電器
の監視回路によれば、不足電圧継電器が３相とも不足電
圧を検出していたことを一定時間だけ確認の後これを記
憶し、いずれの相も不足電圧を検出していないことによ
りこの記憶を解除するように構成した。According to the monitoring circuit of the undervoltage relay according to the above-mentioned claim 11, after confirming that the undervoltage relay has detected the undervoltage in all three phases for a certain period of time, it is stored and stored. Also, the memory is released by not detecting the undervoltage.

【０１１５】従って監視不良の判定時間の確認を阻止す
ることができ、前記図10の効果に加え、系統事故時にい
ずれかの相の不足電圧継電器の復帰不良があったとして
も、これを検出できる。Therefore, it is possible to prevent confirmation of the monitoring failure determination time, and in addition to the effect shown in FIG. 10, even if there is a recovery failure of the undervoltage relay of either phase at the time of a system fault, this can be detected. .

【０１１６】図12は本発明の請求項１２に係る不足電圧
継電器の監視回路の一実施例を示す。図12において図16
と同一部分には同一符号を付してその説明を省略する。
図12に示すブロック図の構成上の特徴は、電圧変化率継
電器３の出力を不良遅延回路71を介してＡＮＤ回路41の
出力とＯＲ回路14によりＯＲ接続の上でＮＯＴ回路51へ
接続したことにある。FIG. 12 shows an embodiment of a monitoring circuit for an undervoltage relay according to claim 12 of the present invention. 16 in FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.
The structural feature of the block diagram shown in FIG. 12 is that the output of the voltage change rate relay 3 is connected to the output of the AND circuit 41 through the defective delay circuit 71 and the OR circuit 14 and is connected to the NOT circuit 51 by OR connection. It is in.

【０１１７】次に請求項１２に係る不足電圧継電器の監
視回路の作用について説明する。図19（ｂ）の電圧が不
足電圧継電器に入力された場合には、ｔ3 時刻以前は不
足電圧継電器１Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃが動
作してＡＮＤ回路41，ＯＲ回路14が成立し、ＮＯＴ回路
51を介してＡＮＤ回路42を阻止する。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 12 will be described. When the voltage of FIG. 19 (b) is input to the undervoltage relay, the undervoltage relays 1A, 1B, 1C, 2A, 2B, 2C operate before the time t 3 and the AND circuit 41 and the OR circuit 14 operate. Established, NOT circuit
AND circuit 42 is blocked via 51.

【０１１８】又、電圧が上昇している過程では電圧変化
率継電器３が出力を生じ、復帰遅延回路71が動作してＯ
Ｒ回路14を成立させる。ｔ3 時刻からｔ4 時刻の間では
電圧がしばらく停滞し、不足電圧継電器１Ａ，１Ｂ，１
Ｃの３相が不揃い動作となるのでＡＮＤ回路41は不成立
となり、電圧変化率継電器３も電圧が変化しないので復
帰する。Also, in the process of increasing the voltage, the voltage change rate relay 3 produces an output, and the return delay circuit 71 operates to turn on O.
The R circuit 14 is established. t 3 time while stagnant voltage between t 4 time from, under voltage relay 1A, 1B, 1
Since the three phases C are not aligned, the AND circuit 41 is not established, and the voltage change rate relay 3 also recovers because the voltage does not change.

【０１１９】しかも、復帰遅延回路71が限時ＬＴ時間は
引き続いて出力を生じるので、ＯＲ回路14は成立したま
まとなりＡＮＤ回路42を阻止できる。ここで復帰遅延回
路71の限時は、試験時に予定する電圧上昇の休止時間よ
り十分長く設定されればよい。Moreover, since the return delay circuit 71 continuously outputs during the time limit LT time, the OR circuit 14 remains established and the AND circuit 42 can be blocked. Here, the time delay of the return delay circuit 71 may be set to be sufficiently longer than the pause time for the voltage increase planned during the test.

【０１２０】ｔ4 時刻以降で電圧が上昇する過程では電
圧変化率継電器３が動作して、上記と同様にＡＮＤ回路
42を阻止する。その後、定格電圧に達すると電圧が一定
になるので電圧変化率継電器３が復帰し、復帰遅延回路
71が限時後に復帰してＡＮＤ回路42の阻止を解除する。
以上の動作により監視不良は阻止される。During the process in which the voltage rises after time t 4 , the voltage change rate relay 3 operates, and the AND circuit operates in the same manner as above.
Stop 42. After that, when the rated voltage is reached, the voltage becomes constant, so the voltage change rate relay 3 recovers, and the recovery delay circuit
71 returns after the time limit and cancels the blocking of the AND circuit 42.
The above operation prevents the monitoring failure.

【０１２１】一方、系統事故時には電圧の急変が生じる
ので電圧変化率継電器３が動作することがあり、この時
には復帰遅延回路71により限時ＬＴ時間だけ監視が阻止
されるが、その期間は短いので影響は小さい。On the other hand, in the event of a system fault, the voltage change rate relay 3 may operate due to a sudden change in voltage. At this time, the recovery delay circuit 71 blocks the monitoring for the time limit LT time, but since that period is short, it is affected. Is small.

【０１２２】上記した請求項１２に係る不足電圧継電器
の監視回路によれば、不足電圧継電器及び電圧変化率継
電器の入力電圧が徐々に変化する場合、相電圧を入力と
する不足電圧継電器及び線間電圧を入力とする不足電圧
継電器のいずれもが３相とも不足電圧を検出している条
件に、所定時間内における所定量以上の電圧変化（即
ち、電圧変化率）を検出したことを一定時間だけ引き延
ばした条件を加えて、いずれかの条件により監視不良の
判定時間の確認を阻止することができ、監視不良を不要
に検出することはない。According to the undervoltage relay monitoring circuit of the twelfth aspect, when the input voltage of the undervoltage relay and the voltage change rate relay gradually changes, the undervoltage relay and the line between which the phase voltage is input are input. Under the condition that all of the undervoltage relays that input voltage are detecting the undervoltage in all three phases, it is necessary to detect the voltage change (that is, the voltage change rate) more than the predetermined amount within the predetermined time for a certain time. In addition to the extended condition, it is possible to prevent the confirmation time of the monitoring failure from being confirmed by any of the conditions, and the monitoring failure is not unnecessarily detected.

【０１２３】図13は本発明の請求項１３に係る不足電圧
継電器の監視回路の一実施例である。図13において図18
と同一部分には同一符号を付して説明を省略する。図13
に示すブロック図の構成上の特徴は、電圧変化率継電器
３の出力を復帰遅延回路71へ入力し、その出力をＯＲ回
路14によりＡＮＤ回路41の出力とＯＲ接続した上で、Ｎ
ＯＴ回路51へ接続したことにある。FIG. 13 shows an embodiment of a monitoring circuit for an undervoltage relay according to claim 13 of the present invention. In FIG. 13, FIG.
The same parts as those in FIG. FIG.
The structural feature of the block diagram shown in is that the output of the voltage change rate relay 3 is input to the return delay circuit 71, the output thereof is OR-connected to the output of the AND circuit 41 by the OR circuit 14, and then N
It is connected to the OT circuit 51.

【０１２４】上記した請求項１３に係る不足電圧継電器
の監視回路によれば、上記の電圧変化が生じた場合で
も、不足電圧継電器が３相とも不足電圧を検出している
条件に、電圧変化率継電器が電圧の変化を検出したこと
を一定時間だけ引き延ばした条件を加えて、いずれかの
条件により監視不良の判定時間の確認を阻止することが
でき、監視不良を不要に検出することはない。According to the undervoltage relay monitoring circuit of the thirteenth aspect, even if the above-mentioned voltage change occurs, the voltage change rate is set in the condition that the undervoltage relay detects the undervoltage in all three phases. By adding a condition that the change of the voltage detected by the relay is delayed for a certain period of time, it is possible to prevent the confirmation time of the monitoring failure from being confirmed under any condition, and the monitoring failure is not unnecessarily detected.

【０１２５】図14は本発明の請求項１４に係る不足電圧
継電器の監視回路の一実施例である。図14において図12
と同一部分には同一符号を付して説明を省略する。図14
に示すブロック図の構成上の特徴は、復帰遅延回路71の
前段に動作遅延回路62を追加したことにある。FIG. 14 shows an embodiment of a monitoring circuit for an undervoltage relay according to claim 14 of the present invention. In FIG. 14, FIG.
The same parts as those in FIG. Fig. 14
The structural feature of the block diagram shown in (1) is that an operation delay circuit 62 is added in the preceding stage of the return delay circuit 71.

【０１２６】次に請求項１４に係る不足電圧継電器の監
視回路の作用について図12との相違を説明する。図12に
おいては系統事故時に電圧変化率継電器３が動作して即
座に復帰遅延回路71が動作したのに対し、本実施例では
電圧変化率継電器３が動作遅延回路62の限時以上動作し
た場合に復帰遅延回路71を動作させるため、系統事故時
における電圧変化率継電器３の出力中の時間以上に動作
遅延回路62の限時を設定することにより、系統事故時に
監視が阻止されるのを防止することができる。Next, the operation of the monitoring circuit of the undervoltage relay according to claim 14 will be described by referring to differences from FIG. In FIG. 12, the voltage change rate relay 3 operates at the time of a system fault and the return delay circuit 71 immediately operates, whereas in the present embodiment, when the voltage change rate relay 3 operates for the time delay of the operation delay circuit 62 or more. In order to operate the return delay circuit 71, the time delay of the operation delay circuit 62 is set to be longer than the time during the output of the voltage change rate relay 3 at the time of a system fault, thereby preventing the monitoring from being interrupted at the time of the system fault. You can

【０１２７】上記した請求項１４に係る不足電圧継電器
の監視回路によれば、前記図12の所定以上の電圧変化率
を検出したことを一定時間だけ引き延ばす条件に、引き
延ばしの前段に一定時間の確認時間を追加しているの
で、前記図12の効果に加え、系統事故時においても前記
の監視不良の判定時間の確認を阻止することが生じず、
速やかに監視不良を検出することができる。According to the undervoltage relay monitoring circuit of the fourteenth aspect, the detection of the voltage change rate of the predetermined value or more in FIG. 12 is confirmed for a certain period of time before the extension under the condition of extending the detection for a certain period of time. Since time is added, in addition to the effect of FIG. 12, it does not occur that the confirmation time of the monitoring failure is prevented from being confirmed even in the event of a system fault,
Improper monitoring can be detected promptly.

【０１２８】図15は本発明の請求項１５に係る不足電圧
継電器の監視回路の一実施例である。図15において図13
と同一部分には同一符号を付してその説明を省略する。
図15に示すブロック図の構成上の特徴は、復帰遅延回路
71の前段に動作遅延回路62を追加したことにある。な
お、作用についての説明は、図14の実施例の説明と同様
であるため省略する。FIG. 15 shows an embodiment of a monitoring circuit for an undervoltage relay according to claim 15 of the present invention. In FIG. 15, FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.
The structural feature of the block diagram shown in FIG.
This is because the operation delay circuit 62 is added to the stage before 71. The description of the operation is the same as the description of the embodiment of FIG.

【０１２９】上記した請求項１５に係る不足電圧継電器
の監視回路によれば、前記図13の電圧変化率継電器によ
り所定以上の電圧の変化率を検出したことを一定時間だ
け引き延ばす条件に、引き延ばしの前段に一定時間の確
認時間を追加しているので、前記図13の効果に加え、系
統事故時においても前記の監視不良の判定時間の確認を
阻止することが生じず、速やかに監視不良を検出するこ
とができる。According to the undervoltage relay monitoring circuit of the fifteenth aspect, when the voltage change rate relay of FIG. 13 detects a voltage change rate of a predetermined value or more, it is extended for a certain period of time. Since a confirmation time of a fixed time is added in the previous stage, in addition to the effect of Fig. 13, in the event of a system fault, the confirmation time of the above-mentioned monitoring failure is not prevented from being confirmed, and the monitoring failure can be detected promptly. can do.

【０１３０】[0130]

【発明の効果】以上説明したように、本発明によれば入
力電圧が緩変化する場合においても監視不良を不要に検
出することがないため、信頼性の高い不足電圧継電器の
監視回路を提供でき、この入力に応動して監視不良を検
出した場合に生じる多数の保護継電装置の一斉の自動ロ
ックという危険要因を解消でき、系統設備の試験及び装
置の運用に利便を図ることができる。As described above, according to the present invention, it is possible to provide a highly reliable monitoring circuit for an undervoltage relay because a monitoring failure is not unnecessarily detected even when the input voltage changes slowly. The risk factor of simultaneous automatic locking of a large number of protective relay devices that occurs when a monitoring failure is detected in response to this input can be eliminated, and it is possible to conveniently test the system equipment and operate the device.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の請求項１に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 1 is a diagram showing an embodiment of a monitoring circuit for an undervoltage relay according to claim 1 of the present invention.

【図２】本発明の請求項２に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 2 is a diagram showing an embodiment of a monitoring circuit for an undervoltage relay according to claim 2 of the present invention.

【図３】本発明の請求項３に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 3 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 3 of the present invention.

【図４】本発明の請求項４に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 4 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 4 of the present invention.

【図５】本発明の請求項５に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 5 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 5 of the present invention.

【図６】本発明の請求項６に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 6 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 6 of the present invention.

【図７】本発明の請求項７に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 7 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 7 of the present invention.

【図８】本発明の請求項８に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 8 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 8 of the present invention.

【図９】本発明の請求項９に係る不足電圧継電器の監視
回路の一実施例を示す図。FIG. 9 is a diagram showing an embodiment of a monitoring circuit for an undervoltage relay according to claim 9 of the present invention.

【図10】本発明の請求項１０に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 10 is a diagram showing an embodiment of a monitoring circuit for an undervoltage relay according to claim 10 of the present invention.

【図11】本発明の請求項１１に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 11 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 11 of the present invention.

【図12】本発明の請求項１２に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 12 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 12 of the present invention.

【図13】本発明の請求項１３に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 13 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 13 of the present invention.

【図14】本発明の請求項１４に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 14 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 14 of the present invention.

【図15】本発明の請求項１５に係る不足電圧継電器の監
視回路の一実施例を示す図。FIG. 15 is a diagram showing an embodiment of a monitoring circuit of an undervoltage relay according to claim 15 of the present invention.

【図16】従来の不足電圧継電器の監視回路を示す図。FIG. 16 is a diagram showing a conventional monitoring circuit for an undervoltage relay.

【図17】従来の不足電圧継電器の監視回路を示す図。FIG. 17 is a diagram showing a conventional monitoring circuit for an undervoltage relay.

【図18】従来の不足電圧継電器の監視回路を示す図。FIG. 18 is a diagram showing a conventional monitoring circuit for an undervoltage relay.

【図19】入力電圧の緩変化を示す図。FIG. 19 is a diagram showing a gradual change in input voltage.

【符号の説明】[Explanation of symbols]

１Ａ，１Ｂ，１Ｃ，２Ａ，２Ｂ，２Ｃ 不足電圧継電器 ３ 電圧変化率継電器 11，12，13，14，15 ＯＲ回路 21，22 駆動回路 31，32 補助継電器 31a ，32a 補助継電器の接点 40，41，42，43 ＡＮＤ回路 51，52，53 ＮＯＴ回路 61，62 動作遅延回路 71 復帰遅延回路 81 フリップフロップ回路 1A, 1B, 1C, 2A, 2B, 2C Undervoltage relay 3 Voltage change rate relay 11, 12, 13, 14, 15 OR circuit 21, 22 Drive circuit 31, 32 Auxiliary relay 31a, 32a Auxiliary relay contact 40, 41 , 42, 43 AND circuit 51, 52, 53 NOT circuit 61, 62 Operation delay circuit 71 Recovery delay circuit 81 Flip-flop circuit

Claims (15)

【特許請求の範囲】[Claims] 【請求項１】 ３相に設けた相電圧を入力とする不足電
圧継電器あるいは線間電圧を入力とする不足電圧継電器
のいずれかの相の出力又はこれに応動する補助継電器の
設定出力が、所定時間以上にわたって不足電圧を検出し
た状態にあることを確認して当該継電器の不良と判定す
る不足電圧継電器の監視回路において、前記相電圧を入
力とする不足電圧継電器が３相とも不足電圧を検出した
状態にあるか、又は前記線間電圧を入力とする不足電圧
継電器が３相とも不足電圧を検出した状態にあるかのい
ずれの条件にても、前記所定時間の確認を阻止させるこ
とを特徴とする不足電圧継電器の監視回路。1. An output of either phase of an undervoltage relay inputting a phase voltage provided for three phases or an undervoltage relay inputting a line voltage or a set output of an auxiliary relay responding to the phase output is predetermined. In the monitoring circuit of the undervoltage relay, which is determined to be defective by confirming that the undervoltage has been detected for over time, the undervoltage relay that inputs the phase voltage detects the undervoltage in all three phases. It is characterized in that the confirmation for the predetermined time is prevented under any condition of being in a state or being in a state in which an undervoltage relay that receives the line voltage as an input detects an undervoltage in all three phases. Undervoltage relay monitoring circuit. 【請求項２】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器又はこれに応動する補助継電
器の接点出力については、相電圧を入力とする不足電圧
継電器が３相とも不足電圧を検出した状態にあることを
条件に、又、線間電圧を入力とする不足電圧継電器又は
これに応動する補助継電器の接点出力については、線間
電圧を入力とする不足電圧継電器が３相とも不足電圧を
検出した状態にあることを条件に構成したことを特徴と
する請求項１記載の不足電圧継電器の監視回路。2. Regarding a contact output of an undervoltage relay that inputs a phase voltage or an auxiliary relay that responds to this as a check condition for confirmation for a predetermined time, an undervoltage relay that inputs a phase voltage is insufficient for all three phases. Under the condition that the voltage is detected, and for the contact output of the undervoltage relay that inputs the line voltage or the auxiliary relay that responds to this, the undervoltage relay that inputs the line voltage is a three-phase The monitoring circuit for the undervoltage relay according to claim 1, wherein the monitoring circuit is configured on the condition that the undervoltage is detected. 【請求項３】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器及び線間電圧を入力とする不
足電圧継電器のいずれもが３相とも不足電圧を検出した
状態にあることを一定時間だけ引き延ばすことを条件に
構成したことを特徴とする請求項１記載の不足電圧継電
器の監視回路。3. A condition for preventing confirmation for a predetermined time is that both an undervoltage relay having a phase voltage as an input and an undervoltage relay having a line voltage as an input are in a state of detecting an undervoltage for all three phases. 2. The undervoltage relay monitoring circuit according to claim 1, wherein the monitoring circuit is configured on the condition that the voltage is extended for a predetermined time. 【請求項４】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器及び線間電圧を入力とする不
足電圧継電器のいずれもが３相とも不足電圧を検出した
状態にあることを、一定時間だけ確認した後、一定時間
だけ引き延ばすことを条件に構成したことを特徴とする
請求項１記載の不足電圧継電器の監視回路。4. The condition for preventing confirmation for a predetermined time is that both of an undervoltage relay having a phase voltage as an input and an undervoltage relay having a line voltage as an input are in a state of detecting an undervoltage in all three phases. The monitoring circuit for an undervoltage relay according to claim 1, wherein the monitoring circuit is configured under the condition that after confirming for a certain time, it is extended for a certain time. 【請求項５】 ３相に設けた不足電圧継電器のいずれか
の相の出力又はこれに応動する補助継電器の出力接点
が、所定時間以上にわたって不足電圧を検出した状態に
あることを確認して、当該継電器の不良と判定する不足
電圧継電器の監視回路において、当該不足電圧継電器が
３相とも不足電圧を検出した状態にあることを一定時間
引き延ばした条件にて前記所定時間の確認を阻止させる
ことを特徴とする不足電圧継電器の監視回路。5. It is confirmed that the output of one of the phases of the undervoltage relay provided in the three phases or the output contact of the auxiliary relay responding to the output is in a state of detecting the undervoltage for a predetermined time or more, In a monitoring circuit for an undervoltage relay that determines that the relay is defective, it is possible to prevent confirmation of the undervoltage relay for a predetermined time by confirming that the undervoltage of all three phases is in a state of detecting the undervoltage for a predetermined time. Characteristic undervoltage relay monitoring circuit. 【請求項６】 所定時間の確認の阻止条件を、３相とも
不足電圧を検出した状態にあることを一定時間だけ確認
した後に、一定時間だけ引き延ばすことを条件に構成し
たことを特徴とする請求項５記載の不足電圧継電器の監
視回路。6. The check condition for a predetermined time is configured such that after confirming that all three phases are in a state of detecting an undervoltage for a predetermined time, the check condition is extended for a predetermined time. Item 5. An undervoltage relay monitoring circuit according to Item 5. 【請求項７】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器及び線間電圧を入力とする不
足電圧継電器のいずれもが３相とも不足電圧を検出した
ことを記憶し、前記不足電圧継電器のいずれもが３相と
も不足電圧を検出していないことを条件に、前記記憶を
解除するように構成したことを特徴とする請求項１記載
の不足電圧継電器の監視回路。7. A condition for preventing confirmation for a predetermined time is that the undervoltage relay having a phase voltage as an input and the undervoltage relay having a line voltage as an input both detect that an undervoltage is detected in all three phases. 2. The undervoltage relay monitoring circuit according to claim 1, wherein the memory is released on the condition that none of the undervoltage relays detects an undervoltage in all three phases. 【請求項８】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器が３相とも不足電圧を検出し
た状態にあるか、又は線間電圧を入力とする不足電圧継
電器が３相とも不足電圧を検出した状態にあるかのいず
れかが成立した場合に、一定時間だけ引き延ばすことを
条件に構成したことを特徴とする請求項１記載の不足電
圧継電器の監視回路。8. The condition for preventing confirmation for a predetermined time is that an undervoltage relay inputting a phase voltage is in a state of detecting an undervoltage for all three phases, or an undervoltage relay inputting a line voltage is 3 2. The undervoltage relay monitoring circuit according to claim 1, wherein if either of the phases is in a state where an undervoltage is detected, the voltage is extended for a certain period of time. 【請求項９】 所定時間の確認の阻止条件を、相電圧を
入力とする不足電圧継電器が３相とも不足電圧を検出し
た状態にあるか、又は線間電圧を入力とする不足電圧継
電器が３相とも不足電圧を検出した状態にあるかのいず
れかを一定時間だけ確認した後に、一定時間だけ引き延
ばすことを条件に構成したことを特徴とする請求項１記
載の不足電圧継電器の監視回路。9. A check condition for confirmation for a predetermined time is that an undervoltage relay that inputs a phase voltage is in a state where an undervoltage is detected in all three phases, or an undervoltage relay that inputs a line voltage is 3 The monitoring circuit for an undervoltage relay according to claim 1, wherein the monitoring circuit for the undervoltage relay is configured on the condition that either one of the phases in which the undervoltage is detected is confirmed for a certain time and then extended for the certain time. 【請求項１０】 所定時間の確認の阻止条件を、不足電
圧継電器が３相とも不足電圧を検出したことを記憶し、
前記不足電圧継電器が３相とも不足電圧を検出していな
いことにより前記記憶を解除するように構成したことを
特徴とする請求項５記載の不足電圧継電器の監視回路。10. A check condition for confirmation for a predetermined time is stored by the fact that an undervoltage relay detects undervoltage in all three phases,
6. The undervoltage relay monitoring circuit according to claim 5, wherein the memory is released when the undervoltage relay does not detect an undervoltage in all three phases. 【請求項１１】 所定時間の確認の阻止条件を、前記不
足電圧継電器が３相とも不足電圧を検出したことを一定
時間だけ確認した後に記憶し、前記不足電圧継電器が３
相とも不足電圧を検出していないことにより前記記憶を
解除するように構成したことを特徴とする請求項５記載
の不足電圧継電器の監視回路。11. The check condition for confirmation for a predetermined time is stored after confirming that the undervoltage relay of all three phases has detected an undervoltage for a certain period of time, and then stored.
6. The undervoltage relay monitoring circuit according to claim 5, wherein the storage is canceled when neither undervoltage is detected in either phase. 【請求項１２】 ３相に設けた相電圧を入力とする不足
電圧継電器あるいは線間電圧を入力とする不足電圧継電
器のいずれかの相の出力又はこれに応動する補助継電器
の接点出力が、所定時間以上にわたって不足電圧を検出
した状態にあることを確認して当該継電器の不良と判定
する不足電圧継電器の監視回路において、前記相電圧を
入力とする不足電圧継電器及び線間電圧を入力とする不
足電圧継電器のいずれもが３相とも不足電圧を検出した
状態にあるか、又は所定時間内における電圧の変化が所
定量以上であることを検出して一定時間だけ引き延ばし
た状態にあるかのいずれかの条件で、前記所定時間の確
認を阻止させることを特徴とする不足電圧継電器の監視
回路。12. The output of either phase of an undervoltage relay inputting a phase voltage provided in three phases or an undervoltage relay inputting a line voltage, or a contact output of an auxiliary relay responding to this is predetermined. In the monitoring circuit of the undervoltage relay that confirms that the undervoltage is detected for a period of time or more and determines that the relay is defective, the undervoltage relay that inputs the phase voltage and the shortage that inputs the line voltage Either of the voltage relays is in a state of detecting an undervoltage for all three phases, or is in a state of being extended for a certain period of time by detecting that the change in voltage within a prescribed period of time is greater than a prescribed amount. The monitoring circuit for the undervoltage relay, which is characterized in that the confirmation of the predetermined time is blocked under the condition. 【請求項１３】 ３相に設けた不足電圧継電器のいずれ
かの相の出力又はこれに応動する補助継電器の出力接点
が、所定時間以上にわたって不足電圧を検出した状態に
あることを確認して、当該継電器の不良と判定する不足
電圧継電器の監視回路において、前記不足電圧継電器が
３相とも不足電圧を検出した状態にあるか又は所定時間
内における電圧の変化が所定量以上であることを検出し
て一定時間だけ引き延ばした状態にあるかのいずれかの
条件で、前記所定時間の確認を阻止させることを特徴と
する不足電圧継電器の監視回路。13. It is confirmed that the output of any one of the undervoltage relays provided in the three phases or the output contact of the auxiliary relay responding to the output is in a state of detecting the undervoltage for a predetermined time or more, In the monitoring circuit of the undervoltage relay that is determined to be defective, the undervoltage relay detects that all three phases have detected the undervoltage or that the change in the voltage within the predetermined time is equal to or more than the predetermined amount. A monitoring circuit for an undervoltage relay, characterized in that the confirmation of the predetermined time is blocked under any condition of being extended for a certain time. 【請求項１４】 所定時間の確認の阻止条件の１つであ
る電圧の変化に関する条件は、所定時間内における電圧
の変化が所定量以上であることを一定時間だけ確認した
後に、一定時間だけ引き延ばすように構成したことを特
徴とする請求項１２記載の不足電圧継電器の監視回路。14. A condition relating to a voltage change, which is one of the check conditions for confirming a predetermined time, is to extend the predetermined time after confirming that the change of the voltage within the predetermined time is equal to or more than a predetermined amount for a predetermined time. 13. The undervoltage relay monitoring circuit according to claim 12, wherein the monitoring circuit is configured as described above. 【請求項１５】 所定時間の確認の阻止条件の１つであ
る電圧の変化に関する条件は、所定時間内における電圧
の変化が所定量以上であることを一定時間だけ確認した
後に、一定時間だけ引き延ばすように構成したことを特
徴とする請求項１３記載の不足電圧継電器の監視回路。15. A condition relating to a voltage change, which is one of the check conditions for confirmation for a predetermined time, is to extend for a predetermined time after confirming that the change in the voltage within the predetermined time is a predetermined amount or more for a predetermined time. 14. The undervoltage relay monitoring circuit according to claim 13, wherein the monitoring circuit is configured as described above.
JP29605495A 1995-09-25 1995-09-25 Monitoring circuit for undervoltage relay Expired - Fee Related JP3468950B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29605495A JP3468950B2 (en) 1995-09-25 1995-09-25 Monitoring circuit for undervoltage relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29605495A JP3468950B2 (en) 1995-09-25 1995-09-25 Monitoring circuit for undervoltage relay

Publications (2)

Publication Number Publication Date
JPH0993786A true JPH0993786A (en) 1997-04-04
JP3468950B2 JP3468950B2 (en) 2003-11-25

Family

ID=17828510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29605495A Expired - Fee Related JP3468950B2 (en) 1995-09-25 1995-09-25 Monitoring circuit for undervoltage relay

Country Status (1)

Country Link
JP (1) JP3468950B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018506016A (en) * 2014-12-29 2018-03-01 ランディス＋ギア インコーポレイテッド Load side voltage detection for utility meters
US10614985B2 (en) 2017-01-05 2020-04-07 Lsis Co., Ltd. 3 phase undervoltage trip device and molded case circuit breaker therewith

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018506016A (en) * 2014-12-29 2018-03-01 ランディス＋ギア インコーポレイテッド Load side voltage detection for utility meters
US10614985B2 (en) 2017-01-05 2020-04-07 Lsis Co., Ltd. 3 phase undervoltage trip device and molded case circuit breaker therewith

Also Published As

Publication number Publication date
JP3468950B2 (en) 2003-11-25

Similar Documents

Publication Publication Date Title
CA2537063C (en) A method and an apparatus for supervising the operation of current transformers
JPH0993786A (en) Undervoltage relay supervising circuit
JP3256639B2 (en) Digital relay device
JPH0522850A (en) Apparatus for countermeasure against breaker operation failure
JPH0315235A (en) Uninterruptible power supply
JPH04200223A (en) Protective relay unit
JPH04127819A (en) Protective relay
JP2670291B2 (en) Protective relay
JP2986267B2 (en) Digital relay device
JPH0254009B2 (en)
JP3269693B2 (en) Protective relay
JPH09182273A (en) Protective relay device
JPH0159813B2 (en)
JP2000201426A (en) Protective relay device
JPH02294237A (en) Ac power supply
JPH08289475A (en) Failure detection method and system switching method for inverter parallel operation system
JPS6245770B2 (en)
JPH02303334A (en) Ac power source device
JP2001016784A (en) Protective device for system interconnecting system
JPH061943B2 (en) Method for automatic abnormality monitoring of shiya disconnector automatic loading device
JPH0125295B2 (en)
JPH0270220A (en) Protective relay
JPH02184219A (en) Automatic monitoring system
JPH0256007B2 (en)
JPS5911721A (en) Protecting repeating device

Legal Events

Date Code Title Description
S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20070905

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080905

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080905

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090905

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090905

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100905

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110905

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110905

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120905

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120905

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130905

Year of fee payment: 10

LAPS Cancellation because of no payment of annual fees