JP3386193B2 - Ground fault directional relay - Google Patents
Ground fault directional relayInfo
- Publication number
- JP3386193B2 JP3386193B2 JP18859493A JP18859493A JP3386193B2 JP 3386193 B2 JP3386193 B2 JP 3386193B2 JP 18859493 A JP18859493 A JP 18859493A JP 18859493 A JP18859493 A JP 18859493A JP 3386193 B2 JP3386193 B2 JP 3386193B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- voltage
- circuit
- ground fault
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は非接地および高抵抗接地
の多相１回線送電線路の地絡方向継電器に関する。
【０００２】
【従来の技術】地絡方向継電器は、図３に示すように、
送電線路に零相電圧検出器ＺＰＣと零相変流器ＺＣＴを
設けて、その検出電圧ＥZおよび検出電流ＩZを地絡方向
継電器ＤＧＲに取り込み、この地絡方向継電器ＤＧＲに
よってこれらの電圧と電流の値が設定値より大きいとき
はその位相比較を行ない、事故が零相変流器ＺＣＴを境
にして電源側か負荷側かの方向を判別して、負荷側の地
絡事故のときに動作して保護動作を行う継電器である。
【０００３】この零相電圧を検出する零相電圧検出器Ｚ
ＰＣは、Ｒ、Ｓ、Ｔ相それぞれにコンデンサＣ１，Ｃ
２，Ｃ３を接続し、それらの中性点と接地Ｅとの間にコ
ンデンサＣ４を挿入し、コンデンサＣ４と並列に変成器
Ｔ１を接続して変成器Ｔ１の２次側から出力電圧ＥZを
得るようにしている。
【０００４】しかし、このような検出器では、Ｒ、Ｓ、
Ｔ相それぞれに耐圧の高い高価なコンデンサＣ１〜Ｃ３
を接続しなければならない為、装置が高価になると共
に、各コンデンサの静電容量の平衡を保つことが必要で
ある為、設置作業、管理等が面倒なものとなる欠点があ
った。
【０００５】また、この他にも図４に示すように、Ｒ、
Ｓ、Ｔ相それぞれに変成器Ｔ２〜Ｔ４の一次側の一端を
接続し、他端を接地し、各変成器Ｔ２〜Ｔ４の二次側を
直列に接続し、端子Ａ１，Ａ２間に現れる電圧に基づい
て地絡事故を検出するようにしたものも実施されている
が、各相に変成器Ｔ２〜Ｔ４を接続しなければならない
為、装置が高価になる欠点があった。
【０００６】そこで、本願の出願人は先に非接地あるい
は高抵抗接地の多相一回線送電線路のうちの１相にのみ
相電圧検出器を設け、この検出相の健全時の相電圧を遅
延回路で反転した出力電圧、若しくは、Ｒ、Ｓ、Ｔ相が
全て健全であるときに補助電源で相電圧検出器の出力電
圧と大きさが等しく極性が反対な出力電圧を得、これら
出力電圧と相電圧検出器から検出された地絡事故時の相
電圧とを合成回路で合成してその差によって零相電圧を
得るようになし、１相にのみ相電圧検出器を設けること
で、従来例に比べて非常に経済的な構成の地絡検出器を
提案した。（特公平４−２７７７５号、以下、先願と略
称する。）
【０００７】
【発明が解決しようとする課題】前記の先願の発明は、
１相にのみ相電圧検出器を設ければ良いので、従来の高
圧コンデンサ３回路分に比して装置が簡単で、工事等の
手数も省け、また、３相の各コンデンサの静電容量を合
わせる必要もなく、設置作業管理等が簡単である、とい
う優れた効果を有する。
【０００８】しかし、検出相の健全時の相電圧を遅延回
路で遅延した後反転して形成するので、遮断器を投入し
たとき遅延回路によって健全時の相電圧が形成されるま
での時間、相電圧検出器から地絡事故時に相当する相電
圧が合成回路から出力され誤動作するおそれがあるの
で、その間、合成回路で出力を出さないようにロックす
る必要がある。この出力にロックをかけると、送電線路
の負荷側で地絡事故が発生しているときに遮断器を投入
すると零相電圧信号が得られず、地絡方向継電器は動作
できないという課題が生じた。
【０００９】即ち、地絡方向継電器は、所定期間内又は
定期的に送電線路の電源を切って精密な点検が行われ
る。又、改修工事等でも遮断器を遮断させ電線路の電源
を切る。このとき、何等かの事由により、負荷側に地絡
状態が形成されたままの状態で遮断器が投入されること
を考慮しなければならない。このとき、合成回路の出力
がロックされていると、地絡方向継電器は動作せず、従
って、電源側の他の地絡方向継電器を動作させることに
なり、事故を他に波及させる。
【００１０】以上の点に鑑み、本発明は、この先願の発
明において、負荷側で地絡事故発生中に遮断器を投入し
たとき、その地絡電流値が設定値以上であれば動作して
遮断器を再び遮断するようにした此の種の継電器を提供
することを目的とする。
【００１１】
【課題を解決するための手段】、本発明における上記の
課題を解決するためのは、非接地及び高抵抗接地の多相
１回線送電線路の１相の相電圧を検出し、この検出電圧
と、該検出電圧を遅延回路で検出した後反転させて形成
した相電圧健全時の電圧とを合成して地絡電圧を取り出
し、この地絡電圧と前記送電線路に設けた零相検出手段
により検出した零相電流との位相比較により、地絡事故
の方向を判断して負荷側であり、且つ地絡電圧及び零相
電流が設定値以上のときに動作出力信号を出力して遮断
器を遮断するようにした地絡方向継電器において、遮断
器投入時に前記検出した相電圧が遅延回路の出力側で確
立するまでの時間の間、前記合成された地絡電圧の出力
をロックするとともに、零相電流信号が設定値以上ある
ときに動作出力信号を出力して遮断器を遮断する手段
を、遅延回路の出力側に設ける。
【００１２】
【作用】送電線路の遮断器が投入され、相電圧健全時の
電圧が遅延回路の出力側で確立（形成）するまでの時間
の間は地絡電圧の出力はロックされ、且つ送電線路の負
荷側に地絡事故またはそれと同じ状態が生じている場合
で、零相電流が設定レベル以上流れた場合は、出力信号
を出し、遮断器を遮断する。
【００１３】
【実施例】以下、本発明を図面に示す実施例に基づいて
説明する。図１は本発明の一実施例の回路構成図で、１
はコンデンサＣ５，Ｃ６、変成器Ｔ５から成り、Ｔ相−
大地間の電圧を検出する相電圧検出器、２は合成回路、
３はＢＢＤ（ＢｕｃｋｅｔＢｒｉｇａｄｅ Ｄｅｖｉｃ
ｅ）等から成る遅延回路、４は反転回路、５は第２のレ
ベル検出回路、６は零相変流器、７は増幅器、８は第１
のレベル検出回路、９は第１のアンドゲートで、増幅器
７，合成回路２を介した第３のアンドゲート１４，第１
のレベル検出回路８および第２のレベル検出回路５の出
力信号を入力し、これら各回路の出力信号が同時に入力
されたとき出力信号ｂを出し、ＯＲ回路１０を介して動
作出力信号Ｃが出力される。この動作出力信号で遮断器
ＣＢを動作させ遮断する。１１は第３のレベル検出回路
で、遮断器ＣＢの投入時、相電圧検出器１より相電圧を
得て遅延回路３により健全時の相電圧を造り出せる時間
ｔ秒の間、出力Ｖａは“０”の状態を保ち、この間イン
バーター１２で反転条件で“１”とし、第２のアンドゲ
ート１３へ供給する。この第２のアンドゲート１３は、
第１のレベル検出回路８の零相電流信号Ｉ0とインバー
ター１２からの信号を入力し、アンド条件が成立したと
き、ＯＲ回路１０に出力信号ａを出力する。一方、第３
のレベル検出回路１１の出力Ｖａが“１”になる時間ｔ
秒間入力を与え、合成回路の出力をロックしておく。
【００１４】次に、動作を説明する。
【００１５】相電圧検出器１内の変成器Ｔ５の出力電圧
は合成回路２及び遅延回路３に加えられる。遅延回路３
は変成器Ｔ５の出力電圧を相電圧の周期Ｔの整数倍（Ｎ
倍）、即ちＴＮ秒遅延させて反転回路４に加え、反転回
路４は遅延回路３の出力電圧を反転して合成回路２に加
え、合成回路２は変成器Ｔ５の出力電圧と反転回路４の
出力電圧とを合成して地絡電圧と大きさ及び位相の等し
い電圧を出力する。従って、地絡事故がない場合は、変
成器Ｔ５の出力電圧と反転回路４の出力電圧とは絶対値
が等しく、極性が反対のものとなるので、合成回路２の
出力電圧は零となり、また地絡事故が発生した場合は、
変成器Ｔ５の出力電圧と反転回路４の出力電圧とは大き
さと位相が異なるものとなるので、合成回路２の出力電
圧は地絡電圧に等しいものとなる。
【００１６】第２のレベル検出回路５は予め設定されて
いる設定レベルを超えたときその出力信号を“１”と
し、第１のアンドゲート９に入力する。また、第１のレ
ベル検出回路８は、零相変流器６の検出電流が設定レベ
ルより大となったとき出力信号Ｉ0を出し、第１のアン
ドゲート９に入力され、この第１のアンドゲート９は、
増幅器７を介して変流器６から加えられる電流の位相と
合成回路２の出力電圧との位相とに基づいて、地絡事故
が電源側、負荷側の何れで発生したかの方向を判断し、
負荷側で発生したと判断した場合に出力信号を出し、そ
の出力信号はＯＲ回路１０を介して動作出力信号Ｃを出
力し、遮断器ＣＢを遮断させる。
【００１７】次に、遮断器ＣＢを開放した状態のとき
に、遮断器ＣＢの負荷側で地絡事故発生中に遮断器ＣＢ
を投入した場合を図２（Ａ），（Ｂ）のタイムチャート
によって説明する。
【００１８】図２（Ａ）はＲ，Ｓ相のどちらかの相の地
絡事故時を想定したもので、今、遮断器ＣＢを投入する
と、遮断器ＣＢより負荷側の送電線路が充電される。こ
のとき、相電圧検出器１から地絡事故状態の相電圧が検
出されて遅延回路３の出力がｔ秒間遅れて“１”になる
までの間、第２のアンドゲート１３の入力は“１”の状
態になる。また、零相変流器６からは零相電流が検出さ
れて第１のレベル検出回路８に入力され、その電流値が
設定値を超えていれば零相電流信号Ｉ0が出力され、こ
れら２つの信号が第２のアンドゲート１３に入力され
る。従って、アンドゲート１３から出力信号ａが出さ
れ、ＯＲ回路１０を介して動作出力信号ｃを出力して投
入した遮断器ＣＢを再び遮断する。遮断器を投入したと
き、相電圧検出器１からの出力信号は、合成回路２に入
力されるが、遅延回路３、反転回路４で健全時相電圧を
造り出せる時間、合成回路２の出力はレベル検出回路１
１でロックされ、第３のアンドゲート１４からは出力さ
れない。
【００１９】図２（Ｂ）ではＴ相の完全地絡事故を想定
したものである。遮断器ＣＢが投入され、負荷側の送電
線路が充電されても、相電圧検出器１がＴ相に接続され
ており、地絡事故時の相電圧は検出されない。
【００２０】従って、第３のレベル検出回路１１の出力
は“０”の状態を保ち続けるので、第２のアンドゲート
１３の入力を“１”の状態になり続ける。このとき、零
相変流器６からは零相電流が検出されて第１のレベル検
出回路８に入力され、その電流値が設定値を超えていれ
ば零相電流信号Ｉ0が出力され、これら２つの信号が第
２のアンドゲート１３に入力される。
【００２１】よって、アンドゲート１３から出力信号ａ
が出され、ＯＲ回路１０を介して動作出力信号Ｃを出力
して投入した遮断器ＣＢを再び遮断する。不完全地絡の
場合は図２（Ａ）と同様となる。
【００２２】尚、本実施例に於いては相電圧検出器１と
してコンデンサ形のものを示したが、これに限られるの
ではなく、リアクトル形等の検出器を用いても良いこと
は勿論である。また、本実施例に於いては反転回路４を
介して遅延回路３の出力電圧を合成回路２に加えるよう
にしたが、遅延回路３の遅延時間をｔ／２（２Ｎ＋１）
とすれば反転回路４を用いる必要はない。また、本実施
例に於いてはＴ相に相電圧検出器１を接続するようにし
たが、Ｒ、Ｓ相に接続するようにしても良いことは勿論
である。
【００２３】
【発明の効果】以上のように本発明は、１相に設けた地
絡検出器で、地絡が検出できるので、高圧コンデンサ３
回路分に比して装置が簡単で、しかも３相の各コンデン
サの静電容量を合わせる必要もないので、工事の手間、
設置場所の省略化等が図れる上に、更に、地絡事故が発
生中に遮断器を投入しても確実に動作して遮断器を遮断
し、他の回線等への事故の波及を防止するという優れた
効果を発揮する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground-fault directional relay for an ungrounded and high-resistance grounded polyphase one-line transmission line. 2. Description of the Related Art As shown in FIG.
Power transmission line to be provided the zero-phase voltage detector ZPC and the zero-phase current transformer ZCT, captures the detected voltage E Z and the detection current I Z ground fault directional relay DGR, and these voltages by the earth fault directional relay DGR When the value of the current is larger than the set value, the phase is compared, and the direction of the fault is determined on the power supply side or the load side with respect to the zero-phase current transformer ZCT. It is a relay that operates and performs a protection operation. A zero-phase voltage detector Z for detecting this zero-phase voltage
PC has capacitors C1 and C for R, S and T phases, respectively.
2, C3 connect, insert the capacitor C4 between their neutral and ground E, the output voltage E Z from the secondary side of the transformer T1 by connecting the transformer T1 in parallel with the capacitor C4 I'm trying to get. However, in such a detector, R, S,
Expensive capacitors C1 to C3 with high withstand voltage for each T phase
Must be connected, so that the apparatus becomes expensive, and it is necessary to maintain the balance of the capacitance of each capacitor, so that installation work, management and the like are troublesome. [0005] In addition, as shown in FIG.
One end of the primary side of the transformers T2 to T4 is connected to each of the S and T phases, the other end is grounded, the secondary sides of the transformers T2 to T4 are connected in series, and the voltage appearing between the terminals A1 and A2. However, there has been a disadvantage that the transformers T2 to T4 must be connected to each phase, so that the apparatus becomes expensive. Accordingly, the applicant of the present application has previously provided a phase voltage detector only in one phase of a non-grounded or high-resistance grounded polyphase one-line transmission line, and delays the phase voltage of this detected phase when it is normal. When the output voltage inverted by the circuit or the R, S, and T phases are all sound, the auxiliary power supply obtains an output voltage having the same magnitude and opposite polarity as the output voltage of the phase voltage detector. By combining a phase voltage at the time of a ground fault detected by the phase voltage detector with a combining circuit and obtaining a zero-phase voltage based on the difference, a phase voltage detector is provided for only one phase. A very economical ground fault detector is proposed. (Japanese Patent Publication No. 4-27775, hereinafter abbreviated to the prior application) [0007] The invention of the prior application is
Since it is sufficient to provide a phase voltage detector only for one phase, the device is simpler than the conventional three high-voltage capacitor circuits, the work and the like are omitted, and the capacitance of each capacitor of the three phases is reduced. There is no need to match, and there is an excellent effect that installation work management and the like are simple. However, since the phase voltage of the detection phase when the sound phase is normal is delayed by a delay circuit and then inverted, the phase voltage is formed by turning on the circuit breaker. Since there is a possibility that a phase voltage corresponding to a ground fault is output from the voltage detector from the combining circuit and malfunctions, it is necessary to lock the combining circuit so that no output is output during that time. When this output is locked, a zero-phase voltage signal cannot be obtained if a breaker is turned on when a ground fault has occurred on the load side of the transmission line, and the ground fault directional relay cannot operate. . That is, the ground fault directional relay is subjected to precise inspection by turning off the power of the transmission line within a predetermined period or periodically. Also, in case of renovation work, the circuit breaker is cut off and the power supply of the power line is turned off. At this time, it is necessary to consider that the circuit breaker is closed in a state where the ground fault state is formed on the load side for some reason. At this time, if the output of the synthesis circuit is locked, the ground fault directional relay does not operate, so that another ground fault directional relay on the power supply side is operated, thereby spreading the accident to another. In view of the above points, the present invention relates to the invention of the prior application, in which, when the circuit breaker is turned on during the occurrence of a ground fault on the load side, if the ground fault current value is equal to or greater than a set value, the circuit is activated. It is an object of the invention to provide a relay of this kind in which the circuit breaker is switched off again. [0011] In order to solve the above-mentioned problems in the present invention, a phase voltage of one phase of an ungrounded and high-resistance grounded multi-phase one-line transmission line is detected, and this is detected. The detected voltage is combined with a voltage at the time of sound phase voltage formed by detecting and inverting the detected voltage with a delay circuit to obtain a ground fault voltage, and this ground fault voltage and a zero-phase detection provided on the transmission line are extracted. the phase comparison between the zero-phase current detected by the means, a load side to determine the direction of the ground fault, and ground voltage and zero sequence
In a ground fault directional relay that outputs an operation output signal when the current is equal to or more than a set value to shut off the circuit breaker, when the circuit breaker is turned on, the detected phase voltage is confirmed at the output side of the delay circuit. Output of the combined ground fault voltage during the time until
And the zero-phase current signal exceeds the set value
Means for occasionally outputting an operation output signal to shut off the circuit breaker is provided on the output side of the delay circuit. The time from when the circuit breaker of the transmission line is turned on until the voltage when the phase voltage is normal is established (formed) at the output side of the delay circuit.
During the locked output of the ground fault voltage, and when the same state ground fault or a load side of the power transmission line has occurred, when flowing zero-phase current is larger than a predetermined level, out the output signal , Shut off the circuit breaker. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is a circuit diagram of an embodiment of the present invention.
Is composed of capacitors C5 and C6 and a transformer T5.
Phase voltage detector for detecting the voltage between the ground, 2 is a synthesis circuit,
3 is BBD (BucketBrigade Device)
e) delay circuit, 4 an inverting circuit, 5 a second level detecting circuit, 6 a zero-phase current transformer, 7 an amplifier, and 8 a first
Is a first AND gate, a third AND gate 14 via the amplifier 7 and the synthesizing circuit 2, and a first AND gate 9.
The output signals of the level detection circuit 8 and the second level detection circuit 5 are inputted. When the output signals of these circuits are inputted simultaneously, the output signal b is outputted, and the operation output signal C is outputted through the OR circuit 10. Is done. The circuit breaker CB is operated and cut off by the operation output signal. Reference numeral 11 denotes a third level detection circuit. When the circuit breaker CB is turned on, the output Va is “t” during a time t seconds during which a phase voltage can be obtained from the phase voltage detector 1 and a normal phase voltage can be produced by the delay circuit 3. The state of "0" is maintained, and during this time, "1" is set by the inverter 12 under the inversion condition and supplied to the second AND gate 13. This second AND gate 13
The zero-phase current signal I 0 of the first level detection circuit 8 and a signal from the inverter 12 are input, and when the AND condition is satisfied, an output signal a is output to the OR circuit 10. Meanwhile, the third
Time t when the output Va of the level detection circuit 11 of FIG.
Input is given for a second and the output of the synthesis circuit is locked. Next, the operation will be described. The output voltage of the transformer T5 in the phase voltage detector 1 is applied to the synthesizing circuit 2 and the delay circuit 3. Delay circuit 3
Sets the output voltage of the transformer T5 to an integral multiple of the period T of the phase voltage (N
Multiplied), that is, delayed by TN seconds and added to the inverting circuit 4, the inverting circuit 4 inverts the output voltage of the delay circuit 3 and adds it to the combining circuit 2, and the combining circuit 2 outputs the output voltage of the transformer T5 and the output voltage of the inverting circuit 4. The output voltage is combined with the ground fault voltage to output a voltage having the same magnitude and phase. Therefore, if there is no ground fault, the output voltage of the transformer T5 and the output voltage of the inverting circuit 4 are equal in absolute value and opposite in polarity, so that the output voltage of the synthesizing circuit 2 becomes zero, and If a ground fault occurs,
Since the output voltage of the transformer T5 and the output voltage of the inverting circuit 4 have different magnitudes and phases, the output voltage of the combining circuit 2 becomes equal to the ground fault voltage. The second level detection circuit 5 sets its output signal to "1" when it exceeds a preset level, and inputs it to the first AND gate 9. Further, the first level detection circuit 8 outputs an output signal I 0 when the detection current of the zero-phase current transformer 6 becomes larger than the set level, and the output signal I 0 is inputted to the first AND gate 9. AND gate 9
Based on the phase of the current applied from the current transformer 6 via the amplifier 7 and the phase of the output voltage of the synthesis circuit 2, it is determined whether the ground fault has occurred on the power supply side or the load side. ,
If it is determined that the load has occurred, an output signal is output, and the output signal outputs an operation output signal C via the OR circuit 10 to shut off the circuit breaker CB. Next, when the circuit breaker CB is in the open state, the circuit breaker CB is disconnected during a ground fault on the load side of the circuit breaker CB.
Will be described with reference to the time charts of FIGS. 2A and 2B. FIG. 2A is based on the assumption that a ground fault has occurred in either of the R and S phases. When the circuit breaker CB is turned on, the transmission line on the load side of the circuit breaker CB is charged. You. At this time, the input of the second AND gate 13 is “1” until the phase voltage in the ground fault state is detected from the phase voltage detector 1 and the output of the delay circuit 3 becomes “1” after a delay of t seconds. "State. Further, a zero-phase current is detected from the zero-phase current transformer 6 and input to the first level detection circuit 8. If the current value exceeds a set value, a zero-phase current signal I 0 is output. Two signals are input to the second AND gate 13. Therefore, the output signal a is output from the AND gate 13, and the operation output signal c is output via the OR circuit 10, and the turned-off circuit breaker CB is cut off again. When the circuit breaker is turned on, the output signal from the phase voltage detector 1 is input to the synthesizing circuit 2, but the output of the synthesizing circuit 2 takes a time during which the delay circuit 3 and the inverting circuit 4 can produce a healthy time phase voltage. Level detection circuit 1
The signal is locked at 1 and is not output from the third AND gate 14. FIG. 2 (B) is based on the assumption that a T-phase complete ground fault has occurred. Even if the circuit breaker CB is turned on and the transmission line on the load side is charged, the phase voltage detector 1 is connected to the T phase, and the phase voltage at the time of the ground fault is not detected. Therefore, the output of the third level detection circuit 11 keeps the state of "0", so that the input of the second AND gate 13 keeps the state of "1". At this time, a zero-phase current is detected from the zero-phase current transformer 6 and input to the first level detection circuit 8, and if the current value exceeds a set value, a zero-phase current signal I 0 is output. These two signals are input to the second AND gate 13. Therefore, the output signal a from the AND gate 13
Is output, the operation output signal C is output via the OR circuit 10, and the turned-off circuit breaker CB is cut off again. The case of an incomplete ground fault is the same as in FIG. In this embodiment, a capacitor type detector is shown as the phase voltage detector 1. However, the present invention is not limited to this, and it is needless to say that a reactor type detector or the like may be used. is there. In the present embodiment, the output voltage of the delay circuit 3 is applied to the synthesis circuit 2 via the inversion circuit 4, but the delay time of the delay circuit 3 is set to t / 2 (2N + 1).
Then, it is not necessary to use the inverting circuit 4. Further, in the present embodiment, the phase voltage detector 1 is connected to the T phase, but may be connected to the R and S phases. As described above, according to the present invention, a ground fault can be detected by a ground fault detector provided in one phase.
The equipment is simpler than the circuit, and there is no need to match the capacitance of each of the three-phase capacitors.
In addition to simplifying the installation location, even if a breaker is turned on during a ground fault accident, it will operate reliably and shut off the circuit breaker to prevent the accident from spreading to other lines. It exerts an excellent effect.
【図面の簡単な説明】 【図１】本発明の一実施例の回路構成図 【図２】本発明を説明するためのタイムチャート （Ａ）はＲ、Ｓ相地絡の場合、（Ｂ）はＴ相地絡の場合 【図３】従来例の地絡方向継電器の構成図 【図４】従来例の説明図 【符号の説明】 １…相電圧検出器 ２…合成回路 ３…遅延回路 ４…反転回路 ５，８，１１…レベル検出回路 ６…零相変流器 ７…増巾器 ９，１３，１４…アンドゲート １０…ＯＲ回路 １２…インバーター[Brief description of the drawings] FIG. 1 is a circuit configuration diagram of an embodiment of the present invention. FIG. 2 is a time chart for explaining the present invention. (A) R and S phase ground fault, (B) T phase ground fault FIG. 3 is a configuration diagram of a conventional earth fault directional relay; FIG. 4 is an explanatory view of a conventional example. [Explanation of symbols] 1 ... Phase voltage detector 2 ... Synthesis circuit 3. Delay circuit 4: Inverting circuit 5, 8, 11 ... level detection circuit 6. Zero-phase current transformer 7 ... Amplifier 9,13,14 ... and gate 10 ... OR circuit 12… Inverter
Claims (1)
線路の１相の相電圧を検出し、この検出電圧と、該検出
電圧を遅延回路で遅延した後反転させて形成した相電圧
健全時の電圧とを合成して地絡電圧を取り出し、この地
絡電圧と前記送電線路に設けた零相電流検出手段により
検出した零相電流信号との位相比較により、地絡事故の
方向を判断して負荷側であり、且つ地絡電圧及び零相電
流が設定値以上のときに動作出力信号を出力して遮断器
を遮断するようにした地絡方向継電器において、遮断器
投入時に前記検出した相電圧が遅延回路の出力側で確立
するまでの時間の間、前記合成された地絡電圧の出力を
ロックするとともに、零相電流信号が設定値以上である
ときに動作出力信号を出力して遮断器を遮断する手段
を、遅延回路の出力側に設けたことを特徴とする地絡方
向継電器。(57) [Claim 1] A phase voltage of one phase of a non-grounded and high-resistance grounded polyphase one-line transmission line is detected, and this detected voltage and the detected voltage are delayed by a delay circuit. Then, the ground voltage is taken out by synthesizing the phase voltage when the phase voltage is normal and formed by inverting the phase voltage, and the phase of the ground fault voltage and the zero-phase current signal detected by the zero-phase current detection means provided on the transmission line. by comparison, load due side der to determine the direction of the ground fault, and ground voltage and zero-phase electricity
In a ground-fault directional relay that outputs an operation output signal when a current is equal to or greater than a set value and shuts off the circuit breaker, a time until the detected phase voltage is established at the output side of the delay circuit when the circuit breaker is turned on. The output of the combined ground fault voltage
Locked and the zero-phase current signal is above the set value
Means for interrupting the circuit breaker and outputs an operation output signal when
The ground fault directional relay, characterized in that the only set on the output side of the delay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18859493A JP3386193B2 (en) | 1993-07-30 | 1993-07-30 | Ground fault directional relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18859493A JP3386193B2 (en) | 1993-07-30 | 1993-07-30 | Ground fault directional relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0746750A JPH0746750A (en) | 1995-02-14 |
| JP3386193B2 true JP3386193B2 (en) | 2003-03-17 |
Family
ID=16226396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18859493A Expired - Lifetime JP3386193B2 (en) | 1993-07-30 | 1993-07-30 | Ground fault directional relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3386193B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10598715B2 (en) | 2015-08-25 | 2020-03-24 | Eaton Intelligent Power Limited | System and method for automatic high resistance ground pulse activation and detection |
-
1993
- 1993-07-30 JP JP18859493A patent/JP3386193B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0746750A (en) | 1995-02-14 |
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