JPH05103417A - Directional-ground relay - Google Patents
Directional-ground relayInfo
- Publication number
- JPH05103417A JPH05103417A JP25916591A JP25916591A JPH05103417A JP H05103417 A JPH05103417 A JP H05103417A JP 25916591 A JP25916591 A JP 25916591A JP 25916591 A JP25916591 A JP 25916591A JP H05103417 A JPH05103417 A JP H05103417A
- Authority
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- Prior art keywords
- zero
- ground fault
- phase
- circuit
- phase voltage
- 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
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- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は地絡方向継電器に関し、
一線完全接地時の地絡電流が大きく、零相電圧の発生が
しにくい配電系統の地絡検出に適した地絡方向継電器に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground fault direction relay,
The present invention relates to a ground fault direction relay suitable for detecting a ground fault in a distribution system in which a ground fault current when the line is completely grounded is large and a zero-phase voltage is unlikely to be generated.
【０００２】[0002]
【従来の技術】地絡方向継電器は、地絡事故時に発生す
る零相電圧と零相電流を検出して、両検出信号が設定レ
ベルを越えたときこれらの電圧分と電流分の信号の位相
比較を行いその事故が零相変流器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保護
動作を行う継電器である。図３はかかる従来の地絡方向
継電器の回路構成図を示している。同図において、２０
は零相電流要素で、該要素は図示省略した零相変流器で
検出した零相電流Ｉｏの基本波成分を取り出すフィルタ
２１と、該フィルタ２１の出力を増幅器２２で増幅し、
設定レベルを越えたとき出力信号を出すレベル検出回路
２３と、フィルタ２１の出力を矩形波に整形する波形整
形回路２４と、この波形整形回路２４の出力とレベル検
出回路２３の出力のアンド条件が成立したときに零相電
流分の信号を出力するアンド回路２５より成る。また、
３０は零相電圧要素で、該要素は図示省略した零相電圧
検出器で検出した零相電圧Ｖｏの基本波成分を取り出す
フィルタ３１と、これを増幅する増幅器３２、増幅器の
出力が設定レベルを越えたときに出力信号を出すレベル
検出回路３３、フィルタ３１の出力を矩形波又はパルス
状に波形整形する波形整形回路３４、該波形整形回路３
４とレベル検出回路３３の出力信号のアンド条件をと
り、アンド条件が成立したときに零相電圧分の信号を出
力するアンド回路３５とから成る。４０は位相判別回路
で、零相電流分と零相電圧分の信号を入力し、両信号の
位相比較をし、地絡事故が零相変流器の電源側か、ある
いは負荷側かを判別し、負荷側のとき出力を時限回路５
０に送出する。時限回路５０は、この出力を入力したと
きは所定時間経過後出力リレーＸの接点を閉じ、しゃ断
器をしゃ断する等の所定の保護動作を行う。2. Description of the Related Art A ground fault directional relay detects a zero-phase voltage and a zero-phase current generated in the event of a ground fault, and when both detection signals exceed a set level, the phase of the voltage component and the current component signal is detected. It is a relay that compares and determines the direction of the power source side or the load side with the zero-phase current transformer as the boundary, and performs a protective action in the event of a ground fault on the load side. FIG. 3 shows a circuit configuration diagram of such a conventional ground fault direction relay. In the figure, 20
Is a zero-phase current element, which is a filter 21 for extracting a fundamental wave component of the zero-phase current Io detected by a zero-phase current transformer (not shown), and an output of the filter 21 is amplified by an amplifier 22.
A level detection circuit 23 that outputs an output signal when the set level is exceeded, a waveform shaping circuit 24 that shapes the output of the filter 21 into a rectangular wave, and an AND condition for the output of the waveform shaping circuit 24 and the output of the level detection circuit 23 The AND circuit 25 outputs a signal corresponding to the zero-phase current when it is satisfied. Also,
Reference numeral 30 denotes a zero-phase voltage element, which is a filter 31 for extracting the fundamental wave component of the zero-phase voltage Vo detected by a zero-phase voltage detector (not shown), an amplifier 32 for amplifying the fundamental wave component, and an output of the amplifier having a set level. A level detection circuit 33 that outputs an output signal when it exceeds, a waveform shaping circuit 34 that shapes the output of the filter 31 into a rectangular wave or a pulse, and the waveform shaping circuit 3
4 and an AND condition for the output signal of the level detection circuit 33, and when the AND condition is satisfied, an AND circuit 35 that outputs a signal for the zero phase voltage is formed. Reference numeral 40 is a phase discrimination circuit, which inputs the signals of the zero-phase current component and the zero-phase voltage component, compares the phases of both signals, and discriminates whether the ground fault is on the power supply side or the load side of the zero-phase current transformer. Output on the load side.
Send to 0. When this output is input, the time limit circuit 50 closes the contact of the output relay X after a lapse of a predetermined time, and performs a predetermined protection operation such as breaking the breaker.
【０００３】[0003]
【発明が解決しようとする課題】地絡方向継電器は上述
のように零相電流と零相電圧の両方が設定レベル以上と
なったときにのみ動作するものであるが、しかし、非接
地系三相三線式配電線で、一線完全接地時の地絡電流が
大きい配電系統では、零相電圧が発生しにくく、高抵抗
検出がなさない。即ち、一線完全地絡事故が発生したに
もかかわらず、零相電圧が設定レベルに達しないため地
絡方向継電器は動作しない。As described above, the ground fault direction relay operates only when both the zero-phase current and the zero-phase voltage exceed the set level. In a three-phase distribution line with a large ground fault current when one line is completely grounded, zero-phase voltage is less likely to occur and high resistance detection is not possible. That is, the ground fault relay does not operate because the zero-phase voltage does not reach the set level even though the one-line complete ground fault has occurred.
【０００４】非接地系三相三線式配電線で一線地絡事故
が発生したときの地絡電圧に対する地絡電流の位相は配
電線の対地静電容量の比率により同相から９０度進相の
範囲で変化する。従って地絡方向継電器は、地絡電圧に
対する地絡電流の位相が同相から９０度進相の範囲で変
化しても、その位相変化により感度変化を生じない特性
が要求される。When a one-line ground fault occurs in a non-grounded three-phase three-wire type distribution line, the phase of the ground fault current with respect to the ground fault voltage is in the range of in-phase to 90-degree advance depending on the ratio of the capacitance of the distribution line to the ground. Changes with. Therefore, the ground fault direction relay is required to have a characteristic that even if the phase of the ground fault current with respect to the ground fault voltage changes within the range of the in-phase to the 90-degree advance, the sensitivity does not change due to the phase change.
【０００５】図４は非接地式６ＫＶ配電線路に例をとっ
た地絡現象の分析グラフで、横軸にオープンデルタ零相
電圧ｖ△（Ｖ）（完全地絡時１９０Ｖ）と、零相電圧百
分率％（ｖ△／１９０Ｖ×１００％）をとり、左縦軸に
検出地絡電流Ｉｇ（Ａ）、右縦軸に検出地絡抵抗値Ｒｇ
（ＫΩ）をとり、一線完全地絡電流Ｉｇｏ（Ａ）との関
係を示したもので、例えば、８Ａバンク（Ｉｇｏ＝８
Ａ）で、絶縁不良が進行するとき、指示点は放射状直線
の８Ａ線上を０から右方向に進行し、９ＫΩまで低下す
ると（Ｒｇ＝９ＫΩ）ｖ△は１０Ｖ（５．３％）発生
し、地絡電流Ｉｇ＝０．４２Ａ流れることを示してい
る。FIG. 4 is an analysis graph of a ground fault phenomenon using an ungrounded 6KV distribution line as an example. The horizontal axis shows an open delta zero-phase voltage vΔ (V) (190V when a complete ground fault) and a zero-phase voltage. Percentage% (vΔ / 190V × 100%) is taken, the left vertical axis shows the detected ground fault current Ig (A), and the right vertical axis shows the detected ground fault resistance value Rg.
(KΩ) and shows the relationship with the one-line complete ground fault current Igo (A). For example, 8A bank (Igo = 8
In A), when the insulation failure progresses, the indicator point advances from 0 to the right on the radial straight line 8A, and when it drops to 9 KΩ (Rg = 9 KΩ) vΔ is 10 V (5.3%), It shows that the ground fault current Ig = 0.42A flows.
【０００６】一般に電力会社の変電所では、地絡抵抗値
Ｒｇを６ＫΩ検出を目標としている。今、一線完全地絡
事故時に一線完全地絡電流Ｉｇｏが３０Ａ流れる配電線
で、６ＫΩ地絡事故が発生すると、地絡電流Ｉｇは約
０．６３Ａ流れることになる。In general, substations of electric power companies aim to detect the ground fault resistance value Rg of 6 KΩ. Now, when a 6KΩ ground fault accident occurs in a distribution line in which the 1-line complete ground fault current Igo flows at 30A at the time of the 1-line complete ground fault, the ground fault current Ig will flow about 0.63A.
【０００７】従来の地絡方向継電器では、上述したよう
に、零相電圧と零相電流の両方が設定レベル値に達した
ときに動作するので、例えば地絡方向継電器の動作設定
値を零相電流Ｉｏが０．２Ａ、零相電圧（百分率）５％
に設定したとすると、地絡電流Ｉｇが０．２Ａ流れたと
き、零相電圧は約０．７５％（図４参照）しか発生せず
地絡方向継電器は動作できない。動作するには、零相電
圧ｖ△は５％に設定してあるので、この５％零相電圧を
発生するための零相電流Ｉｇは１．５Ａ必要となる。即
ち、零相電流Ｉｇが１．５Ａ流れなければ動作しないの
で、上記の完全地絡事故時の０．６３Ａでは動作しない
ことになる。As described above, the conventional ground fault direction relay operates when both the zero phase voltage and the zero phase current reach the set level values. Therefore, for example, the operation set value of the ground fault direction relay is set to the zero phase. Current Io is 0.2A, zero phase voltage (percentage) 5%
When the ground fault current Ig flows 0.2A, the zero-phase voltage is only about 0.75% (see FIG. 4) and the ground fault direction relay cannot operate. In order to operate, since the zero phase voltage vΔ is set to 5%, the zero phase current Ig for generating this 5% zero phase voltage requires 1.5A. That is, if the zero-phase current Ig does not flow at 1.5 A, it does not operate, so it does not operate at 0.63 A at the time of the complete ground fault.
【０００８】このように一線完全接地時の地絡電流が大
きい配電系統では、地絡電流感度を高めても意味がな
く、電力会社の地絡方向継電器が先に動作し、不必要な
停電事故を惹起させることになる。In such a distribution system in which the ground fault current is large when the ground is completely grounded, it is meaningless to increase the ground fault current sensitivity, and the ground fault direction relay of the electric power company operates first, resulting in an unnecessary power failure accident. Will be caused.
【０００９】以上の点に鑑み、本発明は一線完全接地時
の地絡電流が大きい配電系統での地絡事故で零相電圧の
発生が僅少でも確実に動作する地絡方向継電器を提供す
ることを目的とする。In view of the above points, the present invention provides a ground fault direction relay that operates reliably even if the occurrence of a zero-phase voltage is small due to a ground fault in a distribution system in which the ground fault current is large when the grounding is complete. With the goal.
【００１０】[0010]
【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手段は、零相電圧と零相電流が設定
レベルに達したとき、波形整形した零相電圧分と零相電
流分との信号を位相判別回路で位相比較して地絡事故を
検出する地絡方向継電器において、前記零相電圧が設定
レベルに達しないときでも零相電流が設定レベルを越え
たときは地絡検出信号を出力し、且つ零相電圧が設定レ
ベルに達したときには地絡検出信号の出力を停止する高
感度回路を付設する。Means for solving the above-mentioned problems in the present invention are as follows: When the zero-phase voltage and the zero-phase current reach a set level, the waveform-shaped zero-phase voltage component and zero-phase current component. In the ground fault direction relay which detects the ground fault accident by comparing the signals of and with the phase in the phase discrimination circuit, the ground fault is detected when the zero phase current exceeds the set level even when the zero phase voltage does not reach the set level. A high-sensitivity circuit that outputs a signal and that stops the output of the ground fault detection signal when the zero-phase voltage reaches a set level is additionally provided.
【００１１】[0011]
【作用】高感度回路は、零相電圧が設定レベル値以下の
場合でも、零相電流が設定レベル値以上になれば地絡検
出信号を出して保護動作を行わせる。従って、一線完全
接地時の地絡電流が大きい配電系統で、零相電圧の発生
が小さく設定レベル以下の場合でも動作し、電力会社と
の保護協調が完全に保つことができる。The high-sensitivity circuit outputs the ground fault detection signal to perform the protection operation even when the zero-phase voltage is less than the set level value and the zero-phase current is more than the set level value. Therefore, in a distribution system with a large ground fault current when the line is completely grounded, it operates even when the generation of zero-phase voltage is small and below a set level, and protection cooperation with the electric power company can be perfectly maintained.
【００１２】また、零相電圧が設定レベル値に達する
と、高感度回路はロックされて地絡検出信号を停止する
ので、零相電流要素と零相電圧要素の出力を位相判別回
路で位相判別し、本来の地絡方向継電器の動作を行う。
即ち付設した高感度回路は、本来の地絡方向継電器の機
能には何等の影響も与えることがない。When the zero-phase voltage reaches the set level value, the high-sensitivity circuit is locked and the ground fault detection signal is stopped. Therefore, the outputs of the zero-phase current element and the zero-phase voltage element are discriminated by the phase discrimination circuit. Then, the operation of the original ground fault direction relay is performed.
That is, the attached high-sensitivity circuit does not affect the original function of the ground fault direction relay.
【００１３】[0013]
【実施例】以下、本発明を図面に示す一実施例に基づい
て詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings.
【００１４】図１は本発明の一実施例の構成図で、図３
の従来例と同一名称又は同機能を有する部分には、図３
と同一符号を付して説明を省略する。FIG. 1 is a block diagram of an embodiment of the present invention.
The parts having the same names or the same functions as those of the conventional example in FIG.
The same reference numerals are given to omit the description.
【００１５】しかして、本発明は従来の地絡方向継電器
要素に高感度回路１０を付設したことに特徴を有する。
この高感度回路１０は、アンド回路１１を設け、このア
ンド回路１１の一方の入力側に零相電流要素側のレベル
検出回路２３の出力を入力し、他方の入力側に零相電圧
要素側のレベル検出回路３３からインバータ回路１２を
介して入力する。そして、アンド回路１１の出力信号は
直接又はオア回路ＯＲを介して時限回路５０に入力す
る。インバータ回路１２は、零相電圧要素側のレベル検
出回路３３の出力信号が０のとき、即ち、零相電圧が設
定レベル以下のときは、アンド回路１１に出力信号を出
し、レベル検出回路３３の出力信号が有るときはアンド
回路１１への出力を停止する。Therefore, the present invention is characterized in that the high-sensitivity circuit 10 is attached to the conventional ground fault direction relay element.
The high-sensitivity circuit 10 is provided with an AND circuit 11, the input of the output of the level detection circuit 23 on the zero-phase current element side is input to one input side of the AND circuit 11, and the output of the zero-phase voltage element side is input to the other input side. Input from the level detection circuit 33 via the inverter circuit 12. The output signal of the AND circuit 11 is input to the time limit circuit 50 directly or via the OR circuit OR. The inverter circuit 12 outputs an output signal to the AND circuit 11 to output the output signal to the AND circuit 11 when the output signal of the level detection circuit 33 on the zero phase voltage element side is 0, that is, when the zero phase voltage is equal to or lower than the set level. When there is an output signal, the output to the AND circuit 11 is stopped.
【００１６】本発明はこのように構成しているので、零
相電圧要素３０側の検出値が動作設定値（感度値）以下
のときでも、零相電流要素２０側の検出値が動作設定値
以上になると、この両条件でアンド回路１１は地絡検出
信号を出し、時限回路５０を介して所定の時限経過後に
出力リレーＸを動作させる。Since the present invention is configured as described above, even when the detected value on the zero-phase voltage element 30 side is less than the operation set value (sensitivity value), the detected value on the zero phase current element 20 side is set to the operation set value. Under the above conditions, the AND circuit 11 outputs a ground fault detection signal under both of these conditions, and operates the output relay X after a predetermined time period has passed via the time circuit 50.
【００１７】そして、零相電圧要素３０側の検出値が動
作設定値以上になると、高感度回路１０は出力信号を出
さないようにロックされる。従って、地絡方向継電器の
本来の動作を妨げることはない。When the detected value on the side of the zero-phase voltage element 30 exceeds the operation set value, the high sensitivity circuit 10 is locked so as not to output an output signal. Therefore, the original operation of the ground fault direction relay is not hindered.
【００１８】零相電圧発生前は、零相電流だけで動作さ
せることは、その間、無方向性の継電器となり、負荷側
の対地静電容量の大きさにより、方向性を検出する範囲
は決まってしまう。例えば、図２に示すように、零相変
流器ＺＣＴの電源側で地絡事故が発生したことを想定す
ると、負荷側の対地静電容量ＣＬに流れる電流をＩｇL
とすると、このＩｇLが零相変流器ＺＣＴを貫流する。Before the zero-phase voltage is generated, operating with only the zero-phase current makes a non-directional relay during that time, and the range of detecting the directivity is determined by the magnitude of the ground capacitance on the load side. End up. For example, as shown in FIG. 2, assuming that a ground fault has occurred on the power supply side of the zero-phase current transformer ZCT, the current flowing in the ground capacitance CL on the load side is Ig L
Then, this Ig L flows through the zero-phase current transformer ZCT.
【００１９】今、電源側で完全地絡が発生したときにＣ
Ｌに流れる電流ＩｇLを４Ａとすると、そのときの零相
電圧ｖ△と零相電流Ｉｇとの関係は、図４の最下位の放
射線の通りとなり、電源側で零相電圧５％の地絡事故が
発生すると、このときＣＬには０．２Ａの電流が流れる
ことになる。従って、本発明の地絡方向継電器の感度設
定をＩｏ＝０．２Ａ、Ｖｏ＝５％とした場合は、負荷側
の対地静電容量ＣＬに流れる電流ＩｏL＜４Ａである必
要がある。Now, when a complete ground fault occurs on the power source side, C
Assuming that the current Ig L flowing through L is 4 A, the relationship between the zero-phase voltage vΔ and the zero-phase current Ig at that time is as shown in the lowest radiation in FIG. If a fault occurs, a current of 0.2 A will flow through CL at this time. Therefore, when the sensitivity setting of the earth fault directional relay of the present invention Io = 0.2 A, and Vo = 5% is required to be a current Io L <4A flowing to earth capacitance CL of the load side.
【００２０】このときのＣＬの範囲は ＣＬ＜４／２π×５０×１１４００＝１．１μＦとな
る。The range of CL at this time is CL <4 / 2π × 50 × 11400 = 1.1 μF.
【００２１】これは、３８ｍｍ2のケーブル（０．３３
μＦ／ｋｍ）の場合、長さＬは、Ｌ＜３．３ｋｍとな
る。This is a 38 mm 2 cable (0.33
In the case of (μF / km), the length L is L <3.3 km.
【００２２】従って、検出零相電流Ｉｏ＝０．２Ａ、検
出零相電圧Ｖｏ＝５％に設定した場合、３８ｍｍ2ケー
ブルを３．３ｋｍの長さまでの負荷において、電源側で
零相電圧５％までの地絡事故に対し、貰い動作をせず方
向性の機能を発揮することができる。Therefore, when the detected zero-phase current Io = 0.2 A and the detected zero-phase voltage Vo = 5% are set, the zero-phase voltage 5% on the power supply side when the 38 mm 2 cable is a load up to 3.3 km long. With respect to the ground fault up to, it is possible to exert a directional function without performing any action.
【００２３】なお、高感度回路１０の出力は２点鎖線で
示すように、別個の時限回路５０′を設けて警報リレー
Ｙ等を動作させるようにしてもよい。The output of the high-sensitivity circuit 10 may be provided with a separate time limit circuit 50 'as shown by the chain double-dashed line to activate the alarm relay Y or the like.
【００２４】[0024]
【発明の効果】本発明は上述したように、零相電圧が設
定値以下であっても零相電流が設定値以上発生した場合
には高感度回路により地絡検出信号を出して出力リレー
を動作させるようにしたので、一線完全接地時の地絡電
流が大きい配電系統で零相電圧の発生がしにくい場合で
も高抵抗検出ができ、確実に動作して電力会社との完全
な保護協調が可能となり、不必要な停電を防止すること
ができる等優れた効果を発揮する。As described above, according to the present invention, even if the zero-phase voltage is below the set value, if the zero-phase current is above the set value, the high-sensitivity circuit outputs the ground fault detection signal to the output relay. Since it is made to operate, even if it is difficult to generate zero-phase voltage in the distribution system where the ground fault current when the line is completely grounded is large, high resistance detection can be performed, and it operates reliably and complete protection cooperation with the power company is possible. It is possible and can exert an excellent effect such as preventing unnecessary power failure.
【図１】本発明の一実施例の構成図。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】地絡電流説明図。FIG. 2 is an explanatory diagram of a ground fault current.
【図３】従来例の構成図。FIG. 3 is a configuration diagram of a conventional example.
【図４】地絡現象の分析グラフ。FIG. 4 is an analysis graph of a ground fault phenomenon.
１０…高感度回路、１１…アンド回路、１２…インバー
タ回路、２０…零相電流要素、３０…零相電圧要素、２
１，３１…フィルタ、２２，３２…増幅器、２３，３３
…レベル検出回路、２４，３４…波形整形回路、２５，
３５…アンド回路、４０…位相判別回路、５０…時限回
路。10 ... High-sensitivity circuit, 11 ... AND circuit, 12 ... Inverter circuit, 20 ... Zero-phase current element, 30 ... Zero-phase voltage element, 2
1, 31 ... Filter, 22, 32 ... Amplifier, 23, 33
... Level detection circuit, 24, 34 ... Waveform shaping circuit, 25,
35 ... AND circuit, 40 ... Phase discrimination circuit, 50 ... Time circuit.
Claims (1)
たとき、波形整形した零相電圧分と零相電流分との信号
を位相判別回路で位相比較して地絡事故を検出する地絡
方向継電器において、 前記零相電圧が設定レベルに達しないときでも零相電流
が設定レベルを越えたときは地絡検出信号を出力し、且
つ零相電圧が設定レベルに達したときには地絡検出信号
の出力を停止する高感度回路を付設したことを特徴とす
る地絡方向継電器。1. When a zero-phase voltage and a zero-phase current reach a set level, the phase discrimination circuit detects the ground fault by comparing the waveform-shaped signals of the zero-phase voltage component and the zero-phase current component. In the ground fault direction relay, a ground fault detection signal is output when the zero phase current exceeds the set level even when the zero phase voltage does not reach the set level, and a ground fault is detected when the zero phase voltage reaches the set level. A ground fault direction relay, which is provided with a high-sensitivity circuit that stops the output of detection signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3259165A JP2554217B2 (en) | 1991-10-07 | 1991-10-07 | Ground fault directional relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3259165A JP2554217B2 (en) | 1991-10-07 | 1991-10-07 | Ground fault directional relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05103417A true JPH05103417A (en) | 1993-04-23 |
| JP2554217B2 JP2554217B2 (en) | 1996-11-13 |
Family
ID=17330256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3259165A Expired - Fee Related JP2554217B2 (en) | 1991-10-07 | 1991-10-07 | Ground fault directional relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554217B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010172085A (en) * | 2009-01-21 | 2010-08-05 | Mitsubishi Electric Corp | Zero-phase reference input device, and ground fault protection relay |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5020508B2 (en) * | 2005-12-07 | 2012-09-05 | 北陸電力株式会社 | Ground fault direction detector |
| JP4873763B2 (en) * | 2010-05-24 | 2012-02-08 | 有限会社 ライフテクノス | Earth leakage detector with scoop lock |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5128334A (en) * | 1974-09-03 | 1976-03-10 | Nippon Concrete Ind Co Ltd | CHUKUKONKURIITOCHUTAI NO ASHIBAKANAGUTORITSUKEHOHO OYOBI ASHIBAKANAGU |
-
1991
- 1991-10-07 JP JP3259165A patent/JP2554217B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5128334A (en) * | 1974-09-03 | 1976-03-10 | Nippon Concrete Ind Co Ltd | CHUKUKONKURIITOCHUTAI NO ASHIBAKANAGUTORITSUKEHOHO OYOBI ASHIBAKANAGU |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010172085A (en) * | 2009-01-21 | 2010-08-05 | Mitsubishi Electric Corp | Zero-phase reference input device, and ground fault protection relay |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2554217B2 (en) | 1996-11-13 |
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