JP3408992B2 - Low-voltage side ground fault relay - Google Patents
Low-voltage side ground fault relayInfo
- Publication number
- JP3408992B2 JP3408992B2 JP13196699A JP13196699A JP3408992B2 JP 3408992 B2 JP3408992 B2 JP 3408992B2 JP 13196699 A JP13196699 A JP 13196699A JP 13196699 A JP13196699 A JP 13196699A JP 3408992 B2 JP3408992 B2 JP 3408992B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- low
- voltage side
- circuit
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、低圧側巻線がＢ種
接地極に共通接地された複数の高低圧変圧器のいずれか
の低圧側電路が地絡した場合、地絡した低圧側電路を検
出し、地絡した低圧側電路の遮断器を作動させる低圧側
電路地絡方向継電器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground-faulted low-voltage side electric line when any of the high- and low-voltage transformer low-voltage side electric lines having a low-voltage side winding commonly grounded to a B-type ground electrode is grounded. The present invention relates to a low-voltage side electric circuit ground fault direction relay that detects a fault and operates a circuit breaker of the low-voltage side electric circuit that is grounded.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】従来、
ビルディングや工場などの自家用電気設備として、例え
ば高圧側が６．６ｋｖ、低圧側が２００ｖの３相３線式
高低圧変圧器や、高圧側が６．６ｋｖ、低圧側が２００
ｖ−１００ｖの単相３線式高低圧変圧器などが設置され
ている。上記３相３線式高低圧変圧器や単相３線式高低
圧変圧器の場合、電気設備の技術基準の解釈第２４条に
よれば、低圧側巻線の中性点もしくは低圧側巻線端子の
一つにＢ種接地工事（所定の接地抵抗値以下で、通常、
１需要家に１極だけ設けられる共通の接地極工事）を施
すことが義務付けられている。図５は、単相３線式高低
圧変圧器Ｔｒ１の低圧側巻線の中性点Ｎと、３相３線式
高低圧変圧器Ｔｒ２の低圧側巻線端子の一つＴＥとが、
通常、１需要家に１極だけ設けられる共通のＢ種接地極
ＥＢに接続されていることを模式的に示した電気回路図
である。2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a private electric facility such as a building or a factory, for example, a high-voltage side is 6.6 kv, a low-voltage side is a 3-phase three-wire high / low voltage transformer of 200 v, a high-voltage side is 6.6 kv, and a low-voltage side is 200 v
A v-100v single-phase three-wire high / low voltage transformer or the like is installed. In the case of the above-mentioned three-phase three-wire type high / low voltage transformer or single-phase three-wire type high / low voltage transformer, according to Article 24 of the technical standard interpretation of electrical equipment, the neutral point of the low voltage side winding or the low voltage side winding Class B grounding work for one of the terminals (usually less than the specified ground resistance value,
It is obligatory to perform common grounding work (one pole is provided for one customer). FIG. 5 shows that the neutral point N of the low-voltage side winding of the single-phase three-wire type high / low voltage transformer Tr1 and one of the low-voltage side winding terminals TE of the three-phase three-wire type high / low voltage transformer Tr2 are
It is an electric circuit diagram showing typically that it is connected to a common B-type grounding electrode EB, which is usually provided with only one pole for one consumer.
【０００３】上記単相３線式高低圧変圧器Ｔｒ１や３相
３線式高低圧変圧器Ｔｒ２の低圧側電路に接続されるケ
ーブルは、最近、長大になっており、更にコンデンサを
構成素子とするラインフィルタ等を内蔵した電子機器が
負荷として接続されることが多い。そのため、一般に、
低圧側電路の見かけ上の対地静電容量（浮遊容量）Ｃが
大きくなっている。Recently, the cables connected to the low-voltage side electric lines of the single-phase three-wire type high / low voltage transformer Tr1 and the three-phase three-wire type high / low voltage transformer Tr2 have recently become long, and a capacitor is used as a constituent element. In many cases, an electronic device having a built-in line filter or the like is connected as a load. Therefore, in general,
The apparent electrostatic capacitance (floating capacitance) C of the low-voltage side electric circuit is large.
【０００４】上記のような低圧側電路において、図５に
示すように３相３線式高低圧変圧器Ｔｒ２の低圧側電路
のケーブルが例えばＤ種接地（通常、電線管や制御盤、
操作盤などが接地される）された電線管に地絡した場
合、地絡点からの地絡電流は、破線で示すように地絡抵
抗Ｒ、電線管に接続されているＤ種接地線ＥＤＬ、対地
静電容量（浮遊容量）Ｃ、単相３線式高低圧変圧器Ｔｒ
１の低圧側電路、Ｂ種接地線ＥＢＬ、３相３線式高低圧
変圧器Ｔｒ２の低圧側電路で構成される閉回路で流れる
ため、上記地絡とは直接的に関係の無い単相３線式高低
圧変圧器Ｔｒ１の低圧側電路の地絡遮断器ＥＬＢが不要
に作動するという問題がある。In the low-voltage side electric circuit as described above, as shown in FIG. 5, the cable of the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2 is, for example, a D-type ground (usually a conduit tube or a control panel,
When the control panel etc. is grounded to a grounded conduit, the ground fault current from the ground fault point is the ground resistance R as shown by the broken line, and the D-class ground wire EDL connected to the conduit. , Ground capacitance (floating capacitance) C, single-phase three-wire high / low voltage transformer Tr
Since it flows in a closed circuit composed of the low-voltage side electric circuit of No. 1, the class B grounding wire EBL, and the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2, the single-phase 3 which is not directly related to the ground fault. There is a problem that the ground fault circuit breaker ELB of the low voltage side electric path of the wire type high / low voltage transformer Tr1 operates unnecessarily.
【０００５】このように単相３線式高低圧変圧器Ｔｒ１
及び３相３線式高低圧変圧器Ｔｒ２の共通接地極となる
Ｂ種接地極ＥＢに各変圧器の低圧側巻線の中性点Ｎや低
圧側巻線端子ＴＥが共通接続されているため、地絡した
高低圧変圧器の低圧側電路とは直接的に関係の無い地絡
遮断器ＥＬＢが作動することがあるという問題がある。Thus, the single-phase three-wire high / low voltage transformer Tr1
Also, since the neutral point N of the low-voltage side winding of each transformer and the low-voltage side winding terminal TE are commonly connected to the class B grounding electrode EB, which is the common grounding electrode of the three-phase three-wire high / low voltage transformer Tr2. However, there is a problem that the ground fault circuit breaker ELB, which is not directly related to the low-voltage side electric circuit of the ground-faulted high / low voltage transformer, may operate.
【０００６】そこで本発明では、低圧側巻線が共通接地
される複数の高低圧変圧器のどの低圧側電路が地絡した
かを検出し、地絡した低圧側電路の遮断器のみを作動さ
せることができる低圧側電路地絡方向継電器を提供する
ことを課題とする。Therefore, in the present invention, it is detected which low-voltage side electric path of a plurality of high-voltage transformers whose low-voltage side winding is commonly grounded has a ground fault, and only the circuit breaker of the ground-faulted low-voltage side electric circuit is activated. An object of the present invention is to provide a low-voltage side electric path ground fault direction relay that can perform.
【０００７】[0007]
【課題を解決するための手段】上記課題は、特許請求の
範囲に記載した低圧側電路地絡方向継電器により解決す
ることができる。請求項１に記載の低圧側電路地絡方向
継電器は、低圧側巻線が共通接地極に接地された複数の
高低圧変圧器の地絡した低圧側電路を判定するための低
圧側電路地絡方向継電器であって、前記共通接地極は、
接地母線に接続されていて、所定の低圧側巻線の所定接
地点と前記接地母線との間に接続された接地線を流れる
地絡電流の位相が、前記接地母線を流れる地絡電流の位
相よりも進んでいるとともに、前記接地線を流れる地絡
電流が予め設定された基準値を超えている場合に、当該
低圧側巻線の低圧側電路は地絡していることを検出する
ことができる。また、請求項２に記載の低圧側電路地絡
方向継電器によれば、地絡した低圧側電路の遮断器のみ
を差動させることができ、地絡した低圧側電路以外の遮
断器の不要動作を避けることができる。The above problems can be solved by the low voltage side electric circuit ground fault direction relay described in the claims. The low-voltage side electric circuit ground fault direction relay according to claim 1 has a plurality of low-voltage side windings grounded to a common ground electrode.
Low for determining the ground fault low voltage side circuit of high voltage transformer
A pressure side electric circuit ground fault direction relay, wherein the common ground electrode is
It is connected to the ground bus and has a predetermined connection of the predetermined low voltage side winding.
Flowing through a ground wire connected between a point and the ground bus
The phase of the ground fault current is the level of the ground fault current flowing through the ground bus.
A ground fault that is more advanced than the phase and that flows through the ground wire.
If the current exceeds the preset reference value,
Detects that the low-voltage side electric line of the low-voltage side winding is grounded
You can According to the low-voltage side electric circuit ground fault direction relay of claim 2, only the circuit breaker of the ground-faulted low-voltage side electric circuit can be differentiated, and unnecessary operation of circuit breakers other than the ground-faulted low-voltage side electric circuit is possible. Can be avoided.
【０００８】[0008]
【発明の実施の形態】次に、本発明の実施の形態につい
て説明する。図1は、単相３線式高低圧変圧器Ｔｒ１の
低圧側巻線の中性点Ｎ及び３相３線式高低圧変圧器Ｔｒ
２の低圧側巻線端子の一つＴＥを所定接地点とし、この
所定接地点とＢ種接地極（共通接地極）ＥＢとが各接地
線ＥＢＬ１，ＥＢＬ２及び接地母線ＥＢＬ０を介して接
続されていることを示した電気回路図である。図１に示
すように、接地母線ＥＢＬ０を流れる地絡電流を検出す
るための電流検出器ＺＣＴ０、接地線ＥＢＬ１を流れる
地絡電流を検出するための電流検出器ＺＣＴ１、及び接
地線ＥＢＬ２を流れる地絡電流を検出するための電流検
出器ＺＣＴ２が設けられる。また、電流検出器ＺＣＴ
０、電流検出器ＺＣＴ１、及び電流検出器ＺＣＴ２の出
力端子は、単相３線式高低圧変圧器Ｔｒ１もしくは３相
３線式高低圧変圧器Ｔｒ２の低圧側電路が地絡した場
合、地絡した低圧側電路の遮断器を作動させる低圧側電
路地絡方向継電器１に接続されている。BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 shows the neutral point N of the low-voltage side winding of the single-phase three-wire high-voltage transformer Tr1 and the three-phase three-wire high-voltage transformer Tr1.
One of the two low-voltage side winding terminals TE is set as a predetermined ground point, and the predetermined ground point and the B-type ground electrode (common ground electrode) EB are connected via respective ground lines EBL1 and EBL2 and a ground bus EBL0. It is an electric circuit diagram showing that there is. As shown in FIG. 1, a current detector ZCT0 for detecting a ground fault current flowing through the ground bus EBL0, a current detector ZCT1 for detecting a ground fault current flowing through the ground line EBL1, and a ground flowing through the ground line EBL2. A current detector ZCT2 is provided for detecting a junction current. In addition, the current detector ZCT
0, the output terminals of the current detector ZCT1 and the current detector ZCT2 are grounded when the low-voltage side electric path of the single-phase three-wire high / low voltage transformer Tr1 or the three-phase three-wire high / low voltage transformer Tr2 is grounded. It is connected to the low voltage side electric circuit ground fault direction relay 1 which operates the circuit breaker of the low voltage side electric circuit.
【０００９】図２は、低圧側電路地絡方向継電器１の構
成を示したブロック図である。図２に示すように、上記
電流検出器ＺＣＴ０は端子ｚ１，ｚ２間に接続され、電
流検出器ＺＣＴ１は端子ｚ３，ｚ４間に接続され、電流
検出器ＺＣＴ２は端子ｚ５，ｚ６間に接続される。FIG. 2 is a block diagram showing the configuration of the low voltage side electric circuit ground fault direction relay 1. As shown in FIG. 2, the current detector ZCT0 is connected between terminals z1 and z2, the current detector ZCT1 is connected between terminals z3 and z4, and the current detector ZCT2 is connected between terminals z5 and z6. .
【００１０】端子ｚ１，ｚ２に接続された過入力保護回
路２ａ、端子ｚ３，ｚ４に接続された過入力保護回路２
ｂ、及び端子ｚ５，ｚ６に接続された過入力保護回路２
ｃは、過大な電圧の入力を防止し、内部回路を電気的に
保護するための回路である。上記過入力保護回路２ｂに
接続された零相電流整定回路３ａ、及び過入力保護回路
２ｃに接続された零相電流整定回路３ｂは、前記電流検
出器ＺＣＴ１，ＺＣＴ２により検出された各地絡電流の
入力レンジを調整する回路である。零相電流整定回路３
ａに接続されたフィルタ・増幅回路４ｂ、過入力保護回
路２ａに接続されたフィルタ・増幅回路４ａ、零相電流
整定回路３ｂに接続されたフィルタ・増幅回路４ｃは、
高調波、高周波成分を除去し、地絡電流の基本波成分を
増幅する回路である。Over-input protection circuit 2a connected to terminals z1 and z2, and over-input protection circuit 2 connected to terminals z3 and z4.
b and the over-input protection circuit 2 connected to the terminals z5 and z6
Reference character c is a circuit for preventing an excessive voltage input and electrically protecting the internal circuit. The zero-phase current settling circuit 3a connected to the over-input protection circuit 2b and the zero-phase current settling circuit 3b connected to the over-input protection circuit 2c are connected to the ground fault currents detected by the current detectors ZCT1 and ZCT2. This is a circuit that adjusts the input range. Zero-phase current setting circuit 3
The filter / amplifier circuit 4b connected to a, the filter / amplifier circuit 4a connected to the over-input protection circuit 2a, and the filter / amplifier circuit 4c connected to the zero-phase current settling circuit 3b are
It is a circuit that removes harmonics and high frequency components and amplifies the fundamental wave component of the ground fault current.
【００１１】フィルタ・増幅回路４ｂに接続された全波
整流回路５ａ、フィルタ・増幅回路４ｃに接続された全
波整流回路５ｂは、フィルタ・増幅回路４ｂ，４ｃから
出力された交流波形を直流波形に変換する回路である。
フィルタ・増幅回路４ａに接続された波形整形回路６
ａ、フィルタ・増幅回路４ｂに接続された波形整形回路
６ｂ、フィルタ・増幅回路４ｃに接続された波形整形回
路６ｃは、フィルタ・増幅回路４ａ，４ｂ，４ｃから出
力された各正弦波信号の０ボルトからの立ち上がり時に
パルス信号を出力する（後述の図３参照）回路である。The full-wave rectifier circuit 5a connected to the filter / amplifier circuit 4b and the full-wave rectifier circuit 5b connected to the filter / amplifier circuit 4c convert the AC waveforms output from the filter / amplifier circuits 4b and 4c into DC waveforms. It is a circuit to convert to.
Waveform shaping circuit 6 connected to the filter / amplification circuit 4a
a, the waveform shaping circuit 6b connected to the filter / amplification circuit 4b, and the waveform shaping circuit 6c connected to the filter / amplification circuit 4c are used to output 0 of each sine wave signal output from the filter / amplification circuits 4a, 4b, and 4c. It is a circuit that outputs a pulse signal when rising from a volt (see FIG. 3 described later).
【００１２】全波整流回路５ａに接続された平滑回路７
ａ、全波整流回路５ｂに接続された平滑回路７ｂは、全
波整流回路５ａ，５ｂから出力された直流波形のリップ
ルを除去する回路である。平滑回路７ａに接続されたレ
ベル検出回路８ａ、平滑回路７ｂに接続されたレベル検
出回路８ｂは、平滑回路７ａ，７ｂから出力された各信
号の大きさ、即ち、前記電流検出器ＺＣＴ１，ＺＣＴ２
で検出された地絡電流が予め設定された基準値を超えて
いる場合、レベル検出信号を出力する回路である。Smoothing circuit 7 connected to full-wave rectifier circuit 5a
The smoothing circuit 7b connected to the full-wave rectifier circuit 5b is a circuit that removes ripples of the DC waveforms output from the full-wave rectifier circuits 5a and 5b. The level detection circuit 8a connected to the smoothing circuit 7a and the level detection circuit 8b connected to the smoothing circuit 7b are the magnitudes of the signals output from the smoothing circuits 7a and 7b, that is, the current detectors ZCT1 and ZCT2.
It is a circuit that outputs a level detection signal when the ground fault current detected in 1 exceeds a preset reference value.
【００１３】図３は、前記電流検出器ＺＣＴ０で検出さ
れた地絡電流の位相を基準とし、前記電流検出器ＺＣＴ
１，２で検出された地絡電流の位相が遅れているか、進
んでいるかを比較する位相比較回路９ａ，９ｂのタイミ
ングチャートである。尚、上記位相比較回路９ａ，９ｂ
による位相比較の便宜上、図４に示すように電流検出器
ＺＣＴ１，ＺＣＴ２で検出された地絡電流（２点鎖線で
示す波形）の位相を、例えばフィルタ・増幅回路４ｂ，
４ｃの出力時点で予め１８０度ずらした実線で示す波形
に反転させておき、波形整形回路６ｂ，６ｃに入力させ
る。In FIG. 3, the current detector ZCT0 is used with reference to the phase of the ground fault current detected by the current detector ZCT0.
6 is a timing chart of phase comparison circuits 9a and 9b for comparing whether the phase of the ground fault current detected in 1 or 2 is delayed or advanced. The phase comparison circuits 9a and 9b are used.
For the sake of convenience of phase comparison by, the phase of the ground fault current (waveform indicated by a chain double-dashed line) detected by the current detectors ZCT1 and ZCT2 as shown in FIG.
At the time of outputting 4c, it is inverted in advance to the waveform shown by the solid line shifted by 180 degrees, and is input to the waveform shaping circuits 6b and 6c.
【００１４】図３に示した位相比較回路９ａ，９ｂの位
相判定信号ＥＶは、各位相比較回路９ａ，９ｂ内部にお
ける信号であり、波形整形回路６ａの出力パルス信号の
立ち上がりタイミングでオンになり、波形整形回路６ｂ
又は波形整形回路６ｃの出力パルス信号の立ち上がりタ
イミングでオフになるように設定されている。そして、
電流検出器ＺＣＴ０で検出された地絡電流の位相に対し
て、
電流検出器ＺＣＴ１，ＺＣＴ２で検出された地絡電流
の位相が遅れている場合、位相判定信号ＥＶのオン時間
は地絡電流の半周期の時間より短く、
電流検出器ＺＣＴ１，ＺＣＴ２で検出された地絡電流
の位相が進んでいる場合、位相判定信号ＥＶのオン時間
は地絡電流の半周期の時間より長くなる。The phase judgment signals EV of the phase comparison circuits 9a and 9b shown in FIG. 3 are signals inside the phase comparison circuits 9a and 9b, and are turned on at the rising timing of the output pulse signal of the waveform shaping circuit 6a, Waveform shaping circuit 6b
Alternatively, it is set to turn off at the rising timing of the output pulse signal of the waveform shaping circuit 6c. And
When the phase of the ground fault current detected by the current detectors ZCT1 and ZCT2 is delayed with respect to the phase of the ground fault current detected by the current detector ZCT0, the on time of the phase determination signal EV is When the phase of the ground fault current detected by the current detectors ZCT1 and ZCT2 is shorter than the half cycle time, the ON time of the phase determination signal EV becomes longer than the half cycle time of the ground fault current.
【００１５】上記のように、位相比較回路９ａ，９ｂ
は、位相判定信号ＥＶのオン時間と地絡電流の半周期の
時間とを比較することにより、電流検出器ＺＣＴ０で検
出された地絡電流の位相に対して、電流検出器ＺＣＴ
１，ＺＣＴ２で検出された地絡電流の位相が遅れている
か、進んでいるかを判定する。As described above, the phase comparison circuits 9a and 9b
Compares the on-time of the phase determination signal EV with the time of a half cycle of the ground fault current, so that the current detector ZCT is detected with respect to the phase of the ground fault current detected by the current detector ZCT0.
1, it is determined whether the phase of the ground fault current detected by ZCT2 is delayed or advanced.
【００１６】ここで、位相比較回路９ａ，９ｂが、電流
検出器ＺＣＴ０で検出された地絡電流の位相に対して、
電流検出器ＺＣＴ１，ＺＣＴ２で検出された地絡電流の
位相が遅れているか、進んでいるかを比較した結果に基
づいて、どの高低圧変圧器の低圧側電路が地絡している
かを判定するための作用を図１を参照して説明する。
尚、図１に示した地絡電流Ｉ１，Ｉ２，Ｉ３及びＩ４の
矢印の方向は、各地絡電流の正の周期における電流方向
を示している。また、電流検出器ＺＣＴ０，ＺＣＴ１，
ＺＣＴ２の傍に付した矢印は、各電流検出器を設置する
場合に各電流検出器のコイルの巻方向に基づく向き（方
向極性）を示している。Here, the phase comparison circuits 9a and 9b compare the phase of the ground fault current detected by the current detector ZCT0 with
In order to determine which of the high-and low-voltage transformers the low-voltage side electric circuit is ground-faulted based on the result of comparing whether the phase of the ground-fault current detected by the current detectors ZCT1 and ZCT2 is delayed or advanced. The operation of will be described with reference to FIG.
The directions of the arrows of the ground fault currents I1, I2, I3, and I4 shown in FIG. 1 indicate the current directions in the positive cycle of the local fault currents. Further, the current detectors ZCT0, ZCT1,
The arrow attached to the side of ZCT2 indicates the direction (direction polarity) based on the winding direction of the coil of each current detector when each current detector is installed.
【００１７】最初、位相比較回路９ａにより、地絡した
低圧側電路を判定する作用について説明する。
単相３線式高低圧変圧器Ｔｒ１の低圧側電路が、Ｄ種
接地された例えば電線管に地絡した場合、地絡電流は、
地絡抵抗Ｒ１、Ｄ種接地線ＥＤＬ１、Ｄ種接地極ＥＤ、
地中、Ｂ種接地極ＥＢ、接地母線ＥＢＬ０、接地線ＥＢ
Ｌ１、単相３線式高低圧変圧器Ｔｒ１の低圧側電路で構
成される閉回路に流れる電流Ｉ１と、地絡抵抗Ｒ１、Ｄ
種接地線ＥＤＬ１、３相３線式高低圧変圧器Ｔｒ２の浮
遊容量Ｃ２、３相３線式高低圧変圧器Ｔｒ２の低圧側電
路、接地線ＥＢＬ２、接地線ＥＢＬ１、単相３線式高低
圧変圧器Ｔｒ１の低圧側電路で構成される閉回路に流れ
る電流Ｉ２とに分流する。First, the operation of determining the ground-faulted low-voltage side electric path by the phase comparison circuit 9a will be described. When the low-voltage side electric circuit of the single-phase three-wire type high / low voltage transformer Tr1 is grounded to, for example, a conduit tube that is grounded in class D, the ground fault current is:
Ground fault resistance R1, D-type ground line EDL1, D-type ground electrode ED,
Underground, type B grounding electrode EB, grounding bus EBL0, grounding wire EB
L1, a current I1 flowing in a closed circuit constituted by the low-voltage side electric circuit of the single-phase three-wire high / low voltage transformer Tr1, and ground resistances R1, D
Seed ground line EDL1, stray capacitance C2 of 3-phase 3-wire high / low voltage transformer Tr2, low-voltage side electric circuit of 3-phase 3-wire high / low voltage transformer Tr2, ground line EBL2, ground line EBL1, single-phase 3-wire high / low voltage The current is divided into a current I2 flowing in a closed circuit formed by the low-voltage side electric circuit of the transformer Tr1.
【００１８】上記地絡電流Ｉ１は接地母線ＥＢＬ０を流
れるため、電流検出器ＺＣＴ０により検出される。ま
た、上記地絡電流Ｉ１，Ｉ２は接地線ＥＢＬ１を流れる
ため、電流検出器ＺＣＴ１により検出される。この場
合、地絡電流Ｉ２は、３相３線式高低圧変圧器Ｔｒ２の
浮遊容量Ｃ２を流れるため、地絡電流Ｉ１より位相がほ
ぼ９０°進んでいる。従って、電流検出器ＺＣＴ０によ
り検出された地絡電流Ｉ１の位相を基準とした場合、電
流検出器ＺＣＴ１により検出された地絡電流は進み位相
となる。このように、電流検出器ＺＣＴ０により検出さ
れた地絡電流Ｉ１の位相を基準とし、電流検出器ＺＣＴ
１により検出された地絡電流が進み位相となる場合、位
相比較回路９ａは、単相３線式高低圧変圧器Ｔｒ１の低
圧側電路が地絡したと判定し、単相３線式高低圧変圧器
Ｔｒ１の低圧側電路が地絡したことを示す地絡判定信号
を出力する。Since the ground fault current I1 flows through the ground bus EBL0, it is detected by the current detector ZCT0. The ground fault currents I1 and I2 flow through the ground line EBL1 and are detected by the current detector ZCT1. In this case, since the ground fault current I2 flows through the stray capacitance C2 of the three-phase three-wire high / low voltage transformer Tr2, the phase is advanced by 90 ° from the ground fault current I1. Therefore, when the phase of the ground fault current I1 detected by the current detector ZCT0 is used as a reference, the ground fault current detected by the current detector ZCT1 has an advanced phase. In this way, the current detector ZCT0 is used as a reference with respect to the phase of the ground fault current I1 detected by the current detector ZCT0.
When the ground fault current detected by 1 has a lead phase, the phase comparison circuit 9a determines that the low-voltage side electric path of the single-phase three-wire high / low voltage transformer Tr1 is ground-faulted, and the single-phase three-wire high / low voltage. A ground fault determination signal indicating that the low-voltage side electric path of the transformer Tr1 is grounded is output.
【００１９】次に、３相３線式高低圧変圧器Ｔｒ２の
低圧側電路が、Ｄ種接地された電線管に地絡した場合、
地絡電流は、地絡抵抗Ｒ２、Ｄ種接地線ＥＤＬ２、単相
３線式高低圧変圧器Ｔｒ１の浮遊容量Ｃ１、単相３線式
高低圧変圧器Ｔｒ１の低圧側電路、接地線ＥＢＬ１、接
地線ＥＢＬ２、３相３線式高低圧変圧器Ｔｒ２の低圧側
電路で構成される閉回路を流れる電流Ｉ３と、地絡抵抗
Ｒ２、Ｄ種接地線ＥＤＬ２、Ｄ種接地極ＥＤ、地中、Ｂ
種接地極ＥＢ、接地母線ＥＢＬ０、接地線ＥＢＬ２、３
相３線式高低圧変圧器Ｔｒ２の低圧側電路で構成される
閉回路を流れる電流Ｉ４とに分流する。Next, when the low-voltage side electric path of the three-phase three-wire type high / low voltage transformer Tr2 is ground-faulted to the D-type grounded conduit tube,
The ground fault current includes a ground fault resistance R2, a D-type ground wire EDL2, a stray capacitance C1 of the single-phase three-wire high / low voltage transformer Tr1, a low voltage side electric path of the single-phase three-wire high / low voltage transformer Tr1, a ground wire EBL1, The ground line EBL2, the current I3 flowing through the closed circuit configured by the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2, the ground fault resistance R2, the D type ground line EDL2, the D type ground electrode ED, the ground, B
Seed ground electrode EB, ground bus EBL0, ground lines EBL2, 3
It is shunted to the current I4 flowing through the closed circuit constituted by the low-voltage side electric path of the phase 3-wire high / low voltage transformer Tr2.
【００２０】上記地絡電流Ｉ４は接地母線ＥＢＬ０を流
れるため、電流検出器ＺＣＴ０により検出される。ま
た、上記地絡電流Ｉ３は接地線ＥＢＬ１を流れるため、
電流検出器ＺＣＴ１により検出される。この場合、地絡
電流Ｉ３は、単相３線式高低圧変圧器Ｔｒ１の浮遊容量
Ｃ１を流れるため、地絡電流Ｉ４より位相がほぼ９０°
進んでいるが、地絡電流Ｉ３の方向は、電流検出器ＺＣ
Ｔ１の前記方向極性（矢印の向き）と反対であるため、
電流検出器ＺＣＴ１により検出された地絡電流Ｉ３の位
相は地絡電流Ｉ４の位相よりほぼ９０°遅れる。このよ
うに、電流検出器ＺＣＴ１により検出された地絡電流Ｉ
３の位相が地絡電流Ｉ４の位相よりほぼ９０°遅れの場
合、位相比較回路９ａは、３相３線式高低圧変圧器Ｔｒ
２の低圧側電路が地絡したと判定し、前記地絡判定信号
を出力しない。Since the ground fault current I4 flows through the ground bus EBL0, it is detected by the current detector ZCT0. Further, since the ground fault current I3 flows through the ground line EBL1,
It is detected by the current detector ZCT1. In this case, since the ground fault current I3 flows through the stray capacitance C1 of the single-phase three-wire high / low voltage transformer Tr1, the ground fault current I3 is approximately 90 ° in phase than the ground fault current I4.
Although it is proceeding, the direction of the ground fault current I3 is the current detector ZC.
Since it is opposite to the direction polarity (direction of the arrow) of T1,
The phase of the ground fault current I3 detected by the current detector ZCT1 lags behind the phase of the ground fault current I4 by approximately 90 °. Thus, the ground fault current I detected by the current detector ZCT1
When the phase of 3 is behind the phase of the ground fault current I4 by approximately 90 °, the phase comparison circuit 9a determines that the 3-phase 3-wire high / low voltage transformer Tr
It is determined that the low voltage side electric circuit 2 has a ground fault, and the ground fault determination signal is not output.
【００２１】次に、位相比較回路９ｂにより，地絡した
低圧側電路を判定する作用について説明する。
３相３線式高低圧変圧器Ｔｒ２の低圧側電路が、Ｄ種
接地された電線管に地絡した場合、地絡電流は、地絡抵
抗Ｒ２、Ｄ種接地線ＥＤＬ２、単相３線式高低圧変圧器
Ｔｒ１の低圧側電路の浮遊容量Ｃ１、単相３線式高低圧
変圧器Ｔｒ１の低圧側電路、接地線ＥＢＬ１、接地線Ｅ
ＢＬ２、３相３線式高低圧変圧器Ｔｒ２の低圧側電路で
構成される閉回路を流れる電流Ｉ３と、地絡抵抗Ｒ２、
Ｄ種接地線ＥＤＬ２、Ｄ種接地極ＥＤ、地中、Ｂ種接地
極ＥＢ、接地母線ＥＢＬ０、接地線ＥＢＬ２、３相３線
式高低圧変圧器Ｔｒ２の低圧側電路で構成される閉回路
を流れる電流Ｉ４とに分流する。従って、接地母線ＥＢ
Ｌ０には地絡電流Ｉ４が流れ、接地線ＥＢＬ２には地絡
電流Ｉ４とＩ３が流れるため、地絡電流Ｉ４は電流検出
器ＺＣＴ０により検出され、地絡電流Ｉ３，Ｉ４は電流
検出器ＺＣＴ２により検出される。この場合、地絡電流
Ｉ３は、単相３線式高低圧変圧器Ｔｒ１の低圧側電路の
浮遊容量Ｃ１を流れるため、地絡電流Ｉ４より位相がほ
ぼ９０°進んでいる。そのため、電流検出器ＺＣＴ０に
より検出された地絡電流Ｉ４の位相を基準とした場合、
電流検出器ＺＣＴ２により検出された地絡電流は進み位
相となる。このように、電流検出器ＺＣＴ０により検出
された地絡電流Ｉ４の位相を基準とし、電流検出器ＺＣ
Ｔ２により検出された地絡電流が進み位相となる場合、
位相比較回路９ｂは、３相３線式高低圧変圧器Ｔｒ２の
低圧側電路が地絡したと判定し、３相３線式高低圧変圧
器Ｔｒ２の低圧側電路が地絡したことを示す地絡判定信
号を出力する。Next, the operation of determining the ground-faulted low voltage side electric circuit by the phase comparison circuit 9b will be described. When the low-voltage side electric path of the three-phase three-wire type high / low voltage transformer Tr2 is ground-faulted to the D-type grounded conduit tube, the ground fault current is ground fault resistance R2, D-type ground line EDL2, single-phase three-wire type. The stray capacitance C1 of the low-voltage side electric circuit of the high / low voltage transformer Tr1, the low-voltage side electric circuit of the single-phase three-wire high / low voltage transformer Tr1, the ground line EBL1, the ground line E
BL2, a current I3 flowing through a closed circuit constituted by a low-voltage side electric circuit of a three-phase three-wire type high / low voltage transformer Tr2, and a ground fault resistance R2,
A closed circuit composed of the D-type ground line EDL2, the D-type ground electrode ED, the ground, the B-type ground electrode EB, the ground bus EBL0, the ground line EBL2, and the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2. The current is divided into the flowing current I4. Therefore, the ground bus EB
Since the ground fault current I4 flows through L0 and the ground fault currents I4 and I3 flow through the ground line EBL2, the ground fault current I4 is detected by the current detector ZCT0, and the ground fault currents I3 and I4 are detected by the current detector ZCT2. To be detected. In this case, since the ground fault current I3 flows through the stray capacitance C1 of the low voltage side electric circuit of the single-phase three-wire high / low voltage transformer Tr1, the phase is advanced by 90 ° from the ground fault current I4. Therefore, when the phase of the ground fault current I4 detected by the current detector ZCT0 is used as a reference,
The ground fault current detected by the current detector ZCT2 has a lead phase. In this way, the current detector ZC0 is used as a reference, and the current detector ZC0 is used as a reference.
When the ground fault current detected by T2 has a lead phase,
The phase comparison circuit 9b determines that the low-voltage side electric path of the three-phase three-wire type high / low voltage transformer Tr2 is grounded, and indicates that the low-voltage side electric path of the three-phase three-wire type high / low voltage transformer Tr2 is grounded. Outputs a fault determination signal.
【００２２】次に、単相３線式高低圧変圧器Ｔｒ１の
低圧側電路が、Ｄ種接地された電線管に地絡した場合、
地絡電流は、地絡抵抗Ｒ１、Ｄ種接地線ＥＤＬ１、Ｄ種
接地極ＥＤ、地中、Ｂ種接地極ＥＢ、接地母線ＥＢＬ
０、接地線ＥＢＬ１、単相３線式高低圧変圧器Ｔｒ１の
低圧側電路で構成される閉回路に流れる電流Ｉ１と、地
絡抵抗Ｒ１、Ｄ種接地線ＥＤＬ１、３相３線式高低圧変
圧器Ｔｒ２の浮遊容量Ｃ２、３相３線式高低圧変圧器Ｔ
ｒ２の低圧側電路、接地線ＥＢＬ２、接地線ＥＢＬ１、
単相３線式高低圧変圧器Ｔｒ１の低圧側電路で構成され
る閉回路に流れる電流Ｉ２とに分流する。Next, when the low-voltage side electric circuit of the single-phase three-wire type high / low voltage transformer Tr1 is ground-faulted to a conduit tube grounded by class D,
The ground fault current is the ground fault resistance R1, the D type ground wire EDL1, the D type ground electrode ED, the ground, the B type ground electrode EB, and the ground bus EBL.
0, the ground wire EBL1, the current I1 flowing in the closed circuit constituted by the low-voltage side electric circuit of the single-phase three-wire high / low voltage transformer Tr1, the ground fault resistance R1, the D type ground wire EDL1, and the three-phase three-wire high / low voltage Stray capacitance C2 of transformer Tr2, three-phase three-wire high / low voltage transformer T
r2 low-voltage side electric circuit, ground line EBL2, ground line EBL1,
It is shunted to the current I2 flowing in the closed circuit constituted by the low-voltage side electric circuit of the single-phase three-wire high / low voltage transformer Tr1.
【００２３】上記地絡電流Ｉ１は接地母線ＥＢＬ０を流
れるため電流検出器ＺＣＴ０により検出される。また、
上記地絡電流Ｉ２は接地線ＥＢＬ２を流れるため電流検
出器ＺＣＴ２により検出される。この場合、地絡電流Ｉ
２は、３相３線式高低圧変圧器Ｔｒ２の浮遊容量Ｃ２を
流れるため、地絡電流Ｉ１より位相がほぼ９０°進んで
いるが、地絡電流Ｉ２の方向は、電流検出器ＺＣＴ２の
前記方向極性（矢印方向）と反対であるため、電流検出
器ＺＣＴ２により検出された地絡電流Ｉ１の位相は地絡
電流Ｉ４の位相より、ほぼ９０°遅れる。このように、
電流検出器ＺＣＴ２により検出された地絡電流Ｉ１の位
相が地絡電流Ｉ４の位相より、ほぼ９０°遅れている場
合、位相比較回路９ｂは、単相３線式高低圧変圧器Ｔｒ
１の低圧電路が地絡したと判定し、前述の地絡判定信号
を出力しない。The ground fault current I1 flows through the ground bus EBL0 and is detected by the current detector ZCT0. Also,
The ground fault current I2 flows through the ground line EBL2 and is detected by the current detector ZCT2. In this case, the ground fault current I
Since 2 flows through the stray capacitance C2 of the three-phase three-wire high / low voltage transformer Tr2, the phase is advanced by 90 ° from the ground fault current I1, but the direction of the ground fault current I2 is the direction of the current detector ZCT2. Since it is opposite to the direction polarity (arrow direction), the phase of the ground fault current I1 detected by the current detector ZCT2 lags behind the phase of the ground fault current I4 by approximately 90 °. in this way,
When the phase of the ground fault current I1 detected by the current detector ZCT2 is behind the phase of the ground fault current I4 by approximately 90 °, the phase comparison circuit 9b determines that the single-phase three-wire high-voltage transformer Tr
It is determined that the low-voltage road of No. 1 has a ground fault, and the above-mentioned ground fault determination signal is not output.
【００２４】次に、出力リレーＸ１，Ｘ２を作動させる
回路の構成について説明する。レベル検出回路８ａと位
相比較回路９ａに接続されたＡＮＤ回路１０ａは、位相
比較回路９ａから前述の地絡判定信号が出力されるとと
もに、レベル検出回路８ａから前記レベル検出信号が出
力されると、ＡＮＤ信号を出力する。また、レベル検出
回路８ｂと位相比較回路９ｂとに接続されたＡＮＤ回路
１０ｂは、位相比較回路９ｂから前述の地絡判定信号が
出力されるとともに、レベル検出回路８ｂから前記レベ
ル検出信号が出力されると、ＡＮＤ信号を出力する。Next, the structure of the circuit for operating the output relays X1 and X2 will be described. The AND circuit 10a connected to the level detection circuit 8a and the phase comparison circuit 9a outputs the above-mentioned ground fault determination signal from the phase comparison circuit 9a and the level detection signal from the level detection circuit 8a. Output an AND signal. The AND circuit 10b connected to the level detection circuit 8b and the phase comparison circuit 9b outputs the above-mentioned ground fault determination signal from the phase comparison circuit 9b and the level detection signal from the level detection circuit 8b. Then, an AND signal is output.
【００２５】ＡＮＤ回路１０ａに接続された時間整定回
路１１ａ，及びＡＮＤ回路１０ｂに接続された時間整定
回路１１ｂは、ＡＮＤ回路１０ａ，１０ｂから前記ＡＮ
Ｄ信号が予め整定された所定時間、継続して出力された
場合、出力回路１２ａ，１２ｂにリレー作動信号を出力
する。出力回路１２ａ，１２ｂは、時間整定回路１１
ａ，１１ｂからリレー作動信号が出力されると、出力リ
レーＸ１，Ｘ２のコイルに励磁電圧を出力し、出力リレ
ーＸ１，Ｘ２を作動させる。尚、以上の説明から明らか
なように、出力リレーＸ１が作動された場合は、単相３
線式高低圧変圧器Ｔｒ１の低圧側電路が地絡し、所定レ
ベル以上の地絡電流が流れた場合である。また、出力リ
レーＸ２が作動された場合は、３相３線式高低圧変圧器
Ｔｒ２の低圧側電路が地絡し、所定レベル以上の地絡電
流が流れた場合である。The time settling circuit 11a connected to the AND circuit 10a and the time settling circuit 11b connected to the AND circuit 10b are connected from the AND circuits 10a and 10b to the AN circuit.
When the D signal is continuously output for a preset time, the relay operating signal is output to the output circuits 12a and 12b. The output circuits 12a and 12b are the time settling circuit 11
When the relay operating signal is output from a and 11b, the exciting voltage is output to the coils of the output relays X1 and X2 to operate the output relays X1 and X2. As is clear from the above description, when the output relay X1 is activated, the single phase 3
This is a case where the low-voltage side electric path of the wire type high / low voltage transformer Tr1 is ground-faulted and a ground-fault current of a predetermined level or more flows. Further, when the output relay X2 is activated, the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2 is ground-faulted and a ground-fault current of a predetermined level or more flows.
【００２６】出力リレーＸ１のＡ接点は、単相３線式高
低圧変圧器Ｔｒ１の低圧側電路に接続された図示してい
ない遮断器の引外しコイルに接続されており、出力リレ
ーＸ１のＡ接点が閉じると引外しコイルが励磁され、遮
断器が作動する。また、出力リレーＸ１のＢ接点は、例
えばブザー及びランプから成る図示していない警報器と
接続されており、上記Ｂ接点が開くと警報器が作動さ
れ、単相３線式高低圧変圧器Ｔｒ１の低圧側電路が地絡
したことを警報する。The A contact of the output relay X1 is connected to the trip coil of a circuit breaker (not shown) connected to the low-voltage side electric circuit of the single-phase three-wire type high / low voltage transformer Tr1. When the contact is closed, the trip coil is excited and the breaker is activated. Further, the B contact of the output relay X1 is connected to an alarm device (not shown) composed of, for example, a buzzer and a lamp. When the B contact is opened, the alarm device is activated and the single-phase three-wire high / low voltage transformer Tr1. It warns that the low voltage side electric circuit of has been grounded.
【００２７】出力リレーＸ２のＡ接点は、３相３線式高
低圧変圧器Ｔｒ２の低圧側電路に接続された図示してい
ない遮断器の引外しコイルに接続されており、出力リレ
ーＸ２のＡ接点が閉じると引外しコイルが励磁され、遮
断器が作動する。また、出力リレーＸ２のＢ接点は、上
記同様に構成された警報器と接続されており、上記Ｂ接
点が開くと警報器が作動され、３相３線式高低圧変圧器
Ｔｒ２の低圧側電路が地絡したことを警報する。The A contact of the output relay X2 is connected to the trip coil of a circuit breaker (not shown) connected to the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2. When the contact is closed, the trip coil is excited and the breaker is activated. Further, the B contact of the output relay X2 is connected to an alarm device having the same configuration as described above, and when the B contact is opened, the alarm device is activated and the low-voltage side electric circuit of the three-phase three-wire high / low voltage transformer Tr2. Warns that there is a ground fault.
【００２８】尚、前記出力回路１２ａ，１２ｂに接続さ
れた動作表示器１３ａ，１３ｂは、例えば発光ダイオー
ドで構成され、上記出力リレーＸ１，Ｘ２が動作してい
るときに点灯される。また、低圧側電路地絡方向継電器
１の各回路に供給される直流電圧を生成するための電源
回路１４が設けられている。The operation indicators 13a and 13b connected to the output circuits 12a and 12b are, for example, light emitting diodes, and are lit when the output relays X1 and X2 are operating. Further, a power supply circuit 14 for generating a DC voltage supplied to each circuit of the low voltage side electric circuit ground fault direction relay 1 is provided.
【００２９】以上のように、低圧側電路地絡方向継電器
１の位相比較回路９ａ，９ｂにおいて、前記単相３線式
高低圧変圧器Ｔｒ１、３相３線式高低圧変圧器Ｔｒ２の
いずれの低圧側電路が地絡したかを判定することができ
るとともに、地絡した低圧側電路の遮断器のみを確実に
作動させることができる。As described above, in the phase comparison circuits 9a and 9b of the low voltage side circuit ground fault direction relay 1, whichever of the single-phase three-wire type high / low voltage transformer Tr1 and the three-phase three-wire type high / low voltage transformer Tr2 is used. It is possible to determine whether or not the low-voltage side electric circuit is ground-faulted, and it is possible to reliably operate only the circuit breaker of the ground-faulted low-voltage side electric circuit.
【００３０】以上の実施の形態では、地絡判定の対象と
なる高低圧変圧器を単相３線式高低圧変圧器Ｔｒ１と３
相３線式高低圧変圧器Ｔｒ２の２台としたが、低圧側電
路地絡方向継電器１内の各回路を地絡判定の対象となる
高低圧変圧器の台数に応じて増やせば、任意の台数の高
低圧変圧器を地絡判定の対象とすることができる。In the above embodiment, the high and low voltage transformers to be the object of the ground fault judgment are the single-phase three-wire type high and low voltage transformers Tr1 and Tr3.
Two phase 3-wire type high / low voltage transformers Tr2 have been used, but if each circuit in the low voltage side electric circuit ground fault direction relay 1 is increased according to the number of high / low voltage transformers subject to ground fault determination, it will be arbitrary. The number of high-voltage transformers can be the target of the ground fault determination.
【００３１】[0031]
【発明の効果】本発明によれば、低圧側巻線が共通接地
される複数の高低圧変圧器のどの低圧側電路が地絡した
かを検出することができるとともに、地絡した低圧側電
路の遮断器のみを確実に作動させることができるという
効果がある。According to the present invention, it is possible to detect which low voltage side electric path of a plurality of high and low voltage transformers in which the low voltage side winding is commonly grounded has a ground fault, and at the same time, the ground faulted low voltage side electric path. There is an effect that only the circuit breaker can be operated reliably.
【図１】本発明の実施の形態を示した電気回路図であ
る。FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.
【図２】低圧側電路地絡方向継電器の構成を示したブロ
ック図である。FIG. 2 is a block diagram showing a configuration of a low voltage side electric circuit ground fault direction relay.
【図３】位相比較回路の作用説明図である。FIG. 3 is an explanatory diagram of the operation of a phase comparison circuit.
【図４】位相比較回路の作用説明図である。FIG. 4 is a diagram for explaining the operation of the phase comparison circuit.
【図５】従来の問題点を説明するための電気回路図であ
る。FIG. 5 is an electric circuit diagram for explaining a conventional problem.
１ 低圧側電路地絡方向継電器 ９ａ，９ｂ 位相比較回路 １０ａ，１０ｂ ＡＮＤ回路 １１ａ，１１ｂ 時間整定回路 １２ａ，１２ｂ 出力回路 Ｘ１，Ｘ２ 出力リレー Ｔｒ１ 単相３線式高低圧変圧器 Ｔｒ２ ３相３線式高低圧変圧器 Ｎ 中性点 ＴＥ 低圧側巻線端子 ＺＣＴ０ 電流検出器 ＺＣＴ１ 電流検出器 ＺＣＴ２ 電流検出器 ＥＢ Ｂ種接地極 ＥＢＬ０ 接地母線 ＥＢＬ１ 接地線 ＥＢＬ２ 接地線 1 Low voltage side electric circuit ground fault direction relay 9a, 9b Phase comparison circuit 10a, 10b AND circuit 11a, 11b time setting circuit 12a, 12b output circuit X1, X2 output relay Tr1 Single-phase 3-wire high / low voltage transformer Tr2 3-phase 3-wire high / low voltage transformer N neutral point TE Low voltage side winding terminal ZCT0 current detector ZCT1 current detector ZCT2 current detector EB Class B grounding electrode EBL0 ground bus EBL1 ground wire EBL2 ground wire
Claims (2)
数の高低圧変圧器の地絡した低圧側電路を判定するため
の低圧側電路地絡方向継電器であって、前記共通接地極は、接地母線に接続されていて、 所定の低圧側巻線の所定接地点と前記接地母線との間に
接続された接地線を流れる地絡電流の位相が、前記接地
母線を流れる地絡電流の位相よりも進んでいるととも
に、前記接地線を流れる地絡電流が予め設定された基準
値を超えている場合に、当該低圧側巻線の低圧側電路は
地絡していることを検出する検出手段を備えた 低圧側電
路地絡方向継電器。1. A low voltage side circuit ground fault direction relay for determining a ground fault low voltage side circuit of a plurality of high and low voltage transformers in which a low voltage side winding is grounded to a common ground electrode , the common ground electrode. Is connected to the ground busbar, and is connected between the predetermined ground point of the predetermined low-voltage side winding and the ground busbar.
The phase of the ground fault current flowing through the connected ground wire is
It is said that it is ahead of the phase of the ground fault current flowing through the bus.
, The ground current flowing through the ground wire is a preset reference
If the value exceeds the value, the low voltage side electric circuit of the low voltage side winding
A low-voltage side circuit ground fault direction relay equipped with detection means that detects a ground fault .
電器であって、 前記検出手段は、地絡検出した低圧側電路の遮断器を作
動させる低圧側電路地絡方向継電器。2. The low voltage side electric circuit ground fault direction joint according to claim 1.
An electric appliance, wherein the detection means operates a circuit breaker of the low-voltage side electric circuit that has detected a ground fault, and a low-voltage side electric circuit ground fault direction relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196699A JP3408992B2 (en) | 1999-05-12 | 1999-05-12 | Low-voltage side ground fault relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196699A JP3408992B2 (en) | 1999-05-12 | 1999-05-12 | Low-voltage side ground fault relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000324679A JP2000324679A (en) | 2000-11-24 |
| JP3408992B2 true JP3408992B2 (en) | 2003-05-19 |
Family
ID=15070397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13196699A Expired - Fee Related JP3408992B2 (en) | 1999-05-12 | 1999-05-12 | Low-voltage side ground fault relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3408992B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101225449B1 (en) | 2012-09-19 | 2013-01-24 | 백용호 | Integrated high resistance ground device |
-
1999
- 1999-05-12 JP JP13196699A patent/JP3408992B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000324679A (en) | 2000-11-24 |
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