JPH10112929A - Line-to-ground fault detector for low-voltage activating panel circuit - Google Patents
Line-to-ground fault detector for low-voltage activating panel circuitInfo
- Publication number
- JPH10112929A JPH10112929A JP8282888A JP28288896A JPH10112929A JP H10112929 A JPH10112929 A JP H10112929A JP 8282888 A JP8282888 A JP 8282888A JP 28288896 A JP28288896 A JP 28288896A JP H10112929 A JPH10112929 A JP H10112929A
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- circuit
- control system
- line
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、低電圧起動盤の制
御回路の地絡検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground fault detecting device for a control circuit of a low-voltage starting board.
【０００２】[0002]
【従来の技術】従来の低電圧起動盤を図２を用いて説明
する。低電圧起動盤１は、動力電源４の電力を負荷設備
ＬＤに供給する主回路２と動力電源４の電力を所定の電
圧に変圧して低電圧起動盤１の制御回路ＣＣに供給する
制御系回路３とから構成され、主回路２又は負荷設備Ｌ
Ｄの地絡の検出は、主回路２の母線５に設けられた零相
変流器ＺＣＴからの零相電流の有無により地絡の検出を
行う地絡検出器ＧＤにより行う。2. Description of the Related Art A conventional low-voltage starting board will be described with reference to FIG. The low-voltage startup board 1 includes a main circuit 2 that supplies the power of the power supply 4 to the load equipment LD and a control system that converts the power of the power supply 4 to a predetermined voltage and supplies the power to the control circuit CC of the low-voltage startup board 1. And the main circuit 2 or the load equipment L
The ground fault of D is detected by a ground fault detector GD that detects a ground fault based on the presence or absence of a zero-phase current from the zero-phase current transformer ZCT provided on the bus 5 of the main circuit 2.
【０００３】最近主流となっている４００Ｖを採用して
いる低電圧起動盤においては、その制御回路ＣＣにＣＰ
Ｕを採用しており、絶縁レベル等の問題のため、主回路
２と制御系回路３は一つの電源を共用することなく、制
御系回路３には制御回路専用の変圧器ＣＴが別途設けら
れている。その結果、制御回路用の電源の電路は主回路
の電源の電路と切り離されるために制御回路の地絡検出
が行われていない。In a low-voltage starting panel employing 400 V, which has recently become mainstream, a control circuit CC includes a CP.
U, the main circuit 2 and the control system circuit 3 do not share one power supply, and a transformer CT dedicated to the control circuit is separately provided in the control system circuit 3 because of the problem of insulation level and the like. ing. As a result, since the electric circuit of the power supply for the control circuit is cut off from the electric circuit of the power supply of the main circuit, the ground fault detection of the control circuit is not performed.
【０００４】地絡の発生する可能性は、設置環境等によ
り異なるが、主回路２も制御系回路３も同一条件である
にもかかわらず、制御系回路３の地絡検出は電気設備技
術基準で緩和されていて、前記制御回路用の変圧器Ｔ等
を用いて一次側電路と二次側電路を絶縁した場合には、
地絡の検出を行わなくても良いことになっており、非接
地系統であることから、地絡電流が小さく絶縁不良箇所
の過熱、発火の可能性は少ない。The possibility of occurrence of a ground fault varies depending on the installation environment and the like. However, even though the main circuit 2 and the control system circuit 3 are under the same conditions, the detection of the ground fault of the control system circuit 3 is based on the technical standards of electrical equipment. In the case where the primary circuit and the secondary circuit are insulated by using the control circuit transformer T or the like,
It is not necessary to detect the ground fault, and since the system is an ungrounded system, the ground fault current is small and there is little possibility of overheating and ignition of the insulation defective portion.
【０００５】しかしながら、一線地絡の状態が検出でき
ないために、そのまま運転を継続した場合には、他の一
線が同様に地絡すると地絡短絡となり、図２に示す制御
回路用の変圧器Ｔの２次側に設けたヒューズＦが溶断
し、制御回路用電源が停電し、その結果、制御回路ＣＣ
は制御不能となり負荷が突然停止することとなるので、
操業への影響が大きくなるという問題がある。[0005] However, if the operation is continued as it is because the state of one line ground fault cannot be detected, if another line is grounded in the same way, a ground fault short circuit occurs and the transformer T for control circuit shown in FIG. The fuse F provided on the secondary side of the fuse is blown, and the power supply for the control circuit is cut off.
Becomes uncontrollable and the load suddenly stops,
There is a problem that the influence on the operation is increased.
【０００６】しかし、前記制御回路用の変圧器Ｔを設け
た制御回路用電源回路の地絡検出を行うには、図３に示
すように、主回路用地絡検出器ＧＤ１の他に専用の地絡
検出器ＧＤ２を設ける必要があるため、低電圧起動盤の
製作コストが上昇するという問題がある。However, in order to detect the ground fault of the power supply circuit for the control circuit provided with the transformer T for the control circuit, as shown in FIG. 3, in addition to the ground fault detector GD1 for the main circuit, a dedicated ground fault is detected. Since it is necessary to provide the short-circuit detector GD2, there is a problem that the manufacturing cost of the low-voltage starting board increases.
【０００７】[0007]
【発明が解決しようとする課題】本発明は前記のような
問題点を解消するためになされたもので、本発明の目的
は、制御回路用電源専用の変圧器を有する低電圧起動盤
の地絡検出装置を簡単な構成で、且つ製造コストを低コ
ストにすると共に、装置の小型化を実現することにあ
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a low-voltage starting board having a transformer dedicated to a power supply for a control circuit. An object of the present invention is to realize a miniaturization of the device in addition to reducing the manufacturing cost with a simple configuration of the entanglement detection device.
【０００８】[0008]
【課題を解決するための手段】本発明の低電圧起動盤
は、動力電源の電力を負荷設備に供給する主回路と動力
電源の電力を所定電圧に変圧して制御回路に供給する制
御系回路とからなり、前記主回路に設けた主回路及び負
荷設備の地絡を検知する主回路地絡検知手段に、制御系
回路及び制御回路の地絡を検知する制御系地絡検知手段
を併設したものである。A low-voltage starting board according to the present invention comprises a main circuit for supplying power of a power supply to load equipment and a control system circuit for transforming the power of the power supply to a predetermined voltage and supplying it to a control circuit. The main circuit ground fault detecting means for detecting a ground fault in the main circuit and the load equipment provided in the main circuit is provided with a control system ground fault detecting means for detecting a ground fault in the control system circuit and the control circuit. Things.
【０００９】本発明の低電圧起動盤は、前記地絡検知手
段として主回路の零相変流器を用いるものである。The low-voltage starting board of the present invention uses a zero-phase current transformer of a main circuit as the ground fault detecting means.
【００１０】本発明の低電圧起動盤は、動力電源の電力
を負荷設備に供給する主回路と動力電源の電力を所定電
圧に変圧して制御回路に供給する制御系回路とからな
り、前記主回路に設けた零相変流器と、前記制御系回路
に設けた制御回路用変圧器の２次側の中性点から地絡電
流線ＧＬを引出し、前記零相変流器のコア内を貫通し接
地する地絡検出装置である。The low-voltage starting board according to the present invention comprises a main circuit for supplying power of a power supply to load equipment, and a control system circuit for converting the power of the power supply to a predetermined voltage and supplying it to a control circuit. A ground fault current line GL is drawn from a zero-phase current transformer provided in the circuit and a neutral point on the secondary side of the control circuit transformer provided in the control system circuit, and the inside of the core of the zero-phase current transformer is drawn. This is a ground fault detection device that penetrates and grounds.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は本発明の低電圧起動盤１の
実施の一形態を示すものであり、低電圧起動盤１は、電
動機及びヒーター等の負荷設備ＬＤに所定電圧の電力を
供給する主回路２と、前記低電圧起動盤１を制御するた
めの制御回路ＣＣに所定電圧の電力を供給する制御系回
路３から構成される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a low-voltage starter board 1 according to the present invention. The low-voltage starter board 1 includes a main circuit 2 for supplying power of a predetermined voltage to load equipment LD such as an electric motor and a heater, A control system circuit 3 for supplying power of a predetermined voltage to a control circuit CC for controlling the low-voltage starting board 1 is provided.
【００１２】前記主回路２は、Ｒ、Ｓ、Ｔの３相からな
る動力電源４から分岐された母線５と、動力電源４と母
線５との間に設けられた回路遮断器ＣＢと、母線５と電
力の供給先である電動機、ヒーター等の負荷設備ＬＤと
の接続又は遮断を行う電磁接触器ＭＣと、母線５に設け
られその地絡を検出するための零相変流器ＺＣＴと、前
記零相変流器ＺＣＴの２次側電流から地絡の有無を検出
する地絡検出器ＧＤとから構成される。The main circuit 2 includes a bus 5 branched from a power supply 4 having three phases of R, S, and T; a circuit breaker CB provided between the power supply 4 and the bus 5; An electromagnetic contactor MC for connecting or disconnecting the load equipment LD such as a motor and a heater to which electric power is to be supplied, and a zero-phase current transformer ZCT provided on the bus 5 for detecting a ground fault thereof; And a ground fault detector GD for detecting the presence or absence of a ground fault from the secondary current of the zero-phase current transformer ZCT.
【００１３】前記制御系回路３は、前記３線の母線５の
内の２相の電路と接続し、制御回路用の電力を取り出し
制御回路ＣＣに供給する制御回路用電力線６と、前記電
力線６の途中に設けられ母線５から供給された２相の電
圧を制御回路ＣＣに適した電圧に変圧する制御回路用変
圧器Ｔと、前記制御回路用変圧器Ｔの２次側の制御回路
用電力線６に設けられたヒューズＦと、制御回路用電源
及び制御回路ＣＣの地絡状態を検出する地絡検出器ＧＤ
から構成され、前記地絡検出器ＧＤは前記制御回路用変
圧器Ｔの２次側の中性点Ｏから低電圧起動盤１の主回路
である母線５に設けられた零相変流器ＺＣＴのコア内を
貫通した後、接地する地絡電流線ＧＬとから構成され
る。The control system circuit 3 is connected to a two-phase circuit of the three buses 5 to take out power for the control circuit and supply it to the control circuit CC. And a control circuit transformer T for converting a two-phase voltage supplied from the bus 5 to a voltage suitable for the control circuit CC, and a control circuit power line on the secondary side of the control circuit transformer T. 6 and a ground fault detector GD for detecting a ground fault state of the control circuit power supply and the control circuit CC.
And the ground fault detector GD is a zero-phase current transformer ZCT provided from a neutral point O on the secondary side of the control circuit transformer T to a bus 5 which is a main circuit of the low-voltage starting board 1. And a ground fault current line GL which is grounded after passing through the core.
【００１４】以下に低電圧起動盤１の動作を説明する。
先ず、主回路２の動作及び主回路２の地絡検出動作を説
明する。動力電源４から供給されたＲ、Ｓ、Ｔの３相の
所定電圧の電力が、母線５から回路遮断器ＣＢ、零相変
流器ＺＣＴ及び電磁接触器ＭＣを介して電動機及びヒー
ター等の負荷設備ＬＤに供給される。The operation of the low-voltage starting board 1 will be described below.
First, the operation of the main circuit 2 and the ground fault detection operation of the main circuit 2 will be described. Power of a predetermined voltage of three phases R, S, and T supplied from the power source 4 is supplied from the bus 5 to loads such as an electric motor and a heater through the circuit breaker CB, the zero-phase current transformer ZCT, and the electromagnetic contactor MC. It is supplied to the equipment LD.
【００１５】通常、主回路２の電流の３相ベクトルの和
は零であるため、前記零相変流器ＺＣＴの２次側には電
流Ｉo が誘起されないが、主回路２又は負荷設備ＬＤに
地絡事故が発生すると、前記３相ベクトルの和が崩れた
状態となり、零相変流器ＺＣＴの２次側に微小電流Ｉo
が誘起され、これを地絡検出器ＧＤが検出し、主回路２
に地絡が発生したことをディスプレイＤＰ等により知ら
せる。Usually, since the sum of the three-phase vectors of the current in the main circuit 2 is zero, no current Io is induced on the secondary side of the zero-phase current transformer ZCT. When a ground fault occurs, the sum of the three-phase vectors is broken, and a small current Io is applied to the secondary side of the zero-phase current transformer ZCT.
Is induced by the ground fault detector GD, and the main circuit 2
Inform the display DP that a ground fault has occurred.
【００１６】次に、制御系回路用３の動作を説明する。
制御回路用の電圧に適合した電力を供給するため制御回
路用電力線６により前記母線５の内の２相の電路と接続
し、制御回路用電力線６に流れる電流を制御回路用変圧
器Ｔにより所定の電圧に変圧した後、ヒューズＦを介し
て供給先の制御回路ＣＣに所定電圧の電力を供給する。Next, the operation of the control system circuit 3 will be described.
In order to supply electric power suitable for the voltage for the control circuit, the control circuit power line 6 is connected to the two-phase electric path in the bus 5 and the current flowing through the control circuit power line 6 is determined by the control circuit transformer T. After that, the power of a predetermined voltage is supplied to the control circuit CC of the supply destination via the fuse F.
【００１７】以下に前記制御系回路３及び制御回路ＣＣ
の地絡検出動作について説明する。前記地絡検出器ＧＤ
として設けられた地絡電流線ＧＬは、前記制御回路用変
圧器Ｔの２次側の中性点Ｏから引き出し、且つ低電圧起
動盤１の主回路２である母線５に設けられた零相変流器
ＺＣＴのコア内を貫通した後、接地する構成となってい
るため、制御系回路用３及び制御回路ＣＣに地絡が発生
すると、制御系回路３又は制御回路ＣＣから地中を介し
て前記地絡電流線ＧＬの接地Ｇ側から制御回路用変圧器
Ｔの２次側の中性点Ｏに地絡電流Ｉg が流れる。The control system circuit 3 and the control circuit CC will be described below.
Will be described. The ground fault detector GD
A ground-fault current line GL is drawn from the neutral point O on the secondary side of the control circuit transformer T, and a zero-phase current line GL provided on the bus 5 which is the main circuit 2 of the low-voltage starter board 1. Since the grounding occurs after passing through the core of the current transformer ZCT, when a ground fault occurs in the control system circuit 3 and the control circuit CC, the control system circuit 3 or the control circuit CC passes through the ground. Thus, a ground fault current Ig flows from the ground G side of the ground fault current line GL to the neutral point O on the secondary side of the control circuit transformer T.
【００１８】通常、主回路２の電流の３相ベクトルの和
は零であるため、前記零相変流器ＺＣＴの２次側には零
相電流Ｉo が誘起されないが、前記制御系回路用３及び
制御回路ＣＣに地絡が発生して前記前記地絡電流線ＧＬ
に地絡電流Ｉg が流れると、前記３相ベクトルの和が崩
れた状態となり、零相変流器ＺＣＴの２次側に零相電流
Ｉo が誘起され、これを地絡検出器ＧＤが検出し、主回
路２に地絡が発生したことをディスプレイＤＰ等の表示
装置又は警報音等により知らせる。Normally, since the sum of the three-phase vectors of the current in the main circuit 2 is zero, no zero-phase current Io is induced on the secondary side of the zero-phase current transformer ZCT. And a ground fault occurs in the control circuit CC, and the ground fault current line GL is generated.
When a ground fault current Ig flows through the zero-phase current transformer ZCT, a zero-phase current Io is induced on the secondary side of the zero-phase current transformer ZCT, and this is detected by the ground fault detector GD. The occurrence of a ground fault in the main circuit 2 is notified by a display device such as the display DP or an alarm sound.
【００１９】以上のように、本発明においては、低電圧
起動盤１の主回路２又は負荷設備ＬＤの地絡検出用に設
けられた零相変流器ＺＣＴ及び地絡検出器ＧＤを、制御
系回路３及び制御回路ＣＣの地絡検出用に兼用したの
で、制御系回路３及び制御回路ＣＣのための地絡検出器
を別途設ける必要がなくなり、装置が小型化し製造コス
トが低減する。As described above, in the present invention, the zero-phase current transformer ZCT and the ground fault detector GD provided for detecting the ground fault of the main circuit 2 of the low-voltage starting board 1 or the load equipment LD are controlled. Since the system circuit 3 and the control circuit CC are also used for ground fault detection, it is not necessary to separately provide a ground fault detector for the control system circuit 3 and the control circuit CC, and the device is downsized and the manufacturing cost is reduced.
【００２０】前記のように零相変流器ＺＣＴ及び地絡検
出器ＧＤを、主回路２又は負荷設備ＬＤの地絡検出用と
制御系回路３及び制御回路ＣＣの地絡検出用に兼用した
ことにより、装置が簡素化されているが、地絡検出器Ｇ
Ｄにおいては、主回路２又は負荷設備ＬＤの地絡と制御
系回路３及び制御回路ＣＣの地絡とを瞬時に区別する手
段は設けられていない。As described above, the zero-phase current transformer ZCT and the ground fault detector GD are used both for detecting the ground fault of the main circuit 2 or the load equipment LD and for detecting the ground fault of the control system circuit 3 and the control circuit CC. This simplifies the device, but the ground fault detector G
In D, means for instantaneously distinguishing a ground fault of the main circuit 2 or the load equipment LD from a ground fault of the control system circuit 3 and the control circuit CC is not provided.
【００２１】その結果、前記地絡検出器ＧＤが地絡検出
をしても、それが主回路２又は負荷設備ＬＤの地絡で
あるのか、制御系回路３及び制御回路ＣＣの地絡であ
るのか、判別ができない。そこで、前記の地絡検出用
に設けた地絡電流線ＧＬにＯＮ、ＯＦＦスイッチＳＷを
設け、常時スイッチをＯＮの状態にしておき地絡が発生
した時、このスイッチＳＷをＯＦＦ状態にし、地絡検出
器ＧＤが地絡を検出した場合は、前記主回路２又は負
荷設備ＬＤの地絡であり、同様にスイッチＳＷがＯＦＦ
状態で、地絡検出器ＧＤが地絡を検出しない場合は、前
記制御系回路３及び制御回路ＣＣの地絡であると、判
断できる。As a result, even if the ground fault detector GD detects a ground fault, it is a ground fault of the main circuit 2 or the load equipment LD, or a ground fault of the control system circuit 3 and the control circuit CC. Cannot be determined. Therefore, an ON / OFF switch SW is provided on the ground fault current line GL provided for detecting the ground fault, and the switch is always kept ON, and when a ground fault occurs, the switch SW is turned OFF, and the ground fault current line GL is turned OFF. When the ground fault detector GD detects a ground fault, it is a ground fault of the main circuit 2 or the load equipment LD, and the switch SW is similarly turned off.
If the ground fault detector GD does not detect a ground fault in this state, it can be determined that a ground fault has occurred in the control system circuit 3 and the control circuit CC.
【００２２】また、主回路２又は負荷設備ＬＤの地絡
電流と制御系回路３及び制御回路ＣＣの地絡電流とで
は、主回路２又は負荷設備ＬＤの地絡電流の電流値
が、制御系回路３及び制御回路ＣＣの地絡電流の電流
値よりも多少大きく、その方向（＋、−）も異なるの
で、地絡検出器ＧＤに電流の大小を判別する電流値判別
手段又は電流の方向を判別する電流方向判別手段を設け
ることにより、発生した地絡が、主回路２又は負荷設
備ＬＤの地絡であるのか、制御系回路３及び制御回路
ＣＣの地絡であるかがを判別でき、この判定結果をディ
スプレイＤＰ等によ表示することができる。The ground fault current of the main circuit 2 or the load equipment LD and the ground fault current of the control system circuit 3 and the control circuit CC are equal to the current value of the ground fault current of the main circuit 2 or the load equipment LD. Since the current values of the ground fault currents of the circuit 3 and the control circuit CC are slightly larger and their directions (+,-) are different, the current value discriminating means for discriminating the magnitude of the current or the direction of the current is supplied to the ground fault detector GD. By providing the current direction determining means for determining, it is possible to determine whether the generated ground fault is the ground fault of the main circuit 2 or the load equipment LD or the ground fault of the control system circuit 3 and the control circuit CC, This determination result can be displayed on the display DP or the like.
【００２３】[0023]
【発明の効果】本発明においては、低電圧起動盤１の主
回路２及び負荷設備ＬＤの地絡検出用に設けられた零相
変流器ＺＣＴ及び地絡検出器ＧＤを、制御系回路３及び
制御回路ＣＣの地絡検出用に兼用したので、制御系回路
３及び制御回路ＣＣのための地絡検出機構を別途設ける
必要がなくなり、制御系回路の地絡検出と制御回路の地
絡が原因で負荷設備が停電が停電することを未然に防止
することができる。更に装置が小型化し製造コストを低
減できる。According to the present invention, the main circuit 2 of the low-voltage starting board 1 and the zero-phase current transformer ZCT and the ground fault detector GD provided for detecting the ground fault of the load equipment LD are connected to the control system circuit 3. And ground fault detection of the control circuit CC, it is not necessary to separately provide a ground fault detection mechanism for the control system circuit 3 and the control circuit CC. It is possible to prevent the power failure from occurring in the load equipment due to the cause. Further, the size of the apparatus can be reduced and the manufacturing cost can be reduced.
【図１】本発明の低電圧起動盤の概略構成を示す図であ
る。FIG. 1 is a diagram showing a schematic configuration of a low-voltage starting board of the present invention.
【図２】従来の制御系回路及び制御回路の地絡検出が行
われていない低電圧起動盤の概略構成を示す図である。FIG. 2 is a diagram showing a schematic configuration of a conventional control system circuit and a low-voltage starting board in which a ground fault is not detected in the control circuit.
【図３】従来の制御系回路及び制御回路の地絡検出を行
っている低電圧起動盤の概略構成を示す図である。FIG. 3 is a diagram showing a schematic configuration of a conventional control system circuit and a low-voltage start-up board that detects a ground fault in the control circuit.
１ 低電圧起動盤 ２ 主回路 ３ 制御系回路 ４ 動力電源 ５ 母線 ６ 制御回路用電力線 Ｔ 制御回路用変圧器 Ｏ 中性点 Ｆ ヒューズ ＣＣ 制御回路 ＣＢ 回路遮断器 ＺＣＴ 零相変流器 ＭＣ 電磁接触器 ＬＤ 負荷設備（電動機、ヒーター等） ＧＬ 地絡電流線 ＳＷ 地絡電流線ＯＮ、ＯＦＦスイッチ ＧＤ 地絡検出器 Ｇ 接地 Ｉg 地絡電流 Ｉo 零相電流 DESCRIPTION OF SYMBOLS 1 Low voltage start board 2 Main circuit 3 Control system circuit 4 Power supply 5 Bus 6 Control circuit power line T Control circuit transformer O Neutral point F Fuse CC Control circuit CB Circuit breaker ZCT Zero-phase current transformer MC Electromagnetic contact Device LD Load equipment (motor, heater, etc.) GL Ground fault current line SW Ground fault current line ON / OFF switch GD Ground fault detector G Ground Ig Ground fault current Io Zero-phase current
Claims (1)
回路と動力電源の電力を所定の電圧に変圧して制御回路
に供給する制御系回路とからなる低電圧起動盤におい
て、 主回路及び負荷設備の地絡を検知する主回路零相変流器
に、制御系回路用電圧に変圧するための変圧器の２次側
の中性点から、前記零相変流器のコア内を貫通し、接地
させた制御系回路に発生した地絡電流を流す地絡電流線
と、前記零相変流器の２次側に前記主回路又は制御系回
路の地絡を検出する地絡検出器と、前記地絡検出器の検
出出力が地絡が主回路のものか、制御系回路のものかを
判別する地絡判別機能を設けたことを特徴とする低電圧
起動盤回路用地絡検出装置。1. A low-voltage starting board comprising a main circuit for supplying power of a power supply to load equipment and a control system circuit for transforming the power of the power supply to a predetermined voltage and supplying the voltage to a control circuit. The main circuit zero-phase current transformer that detects the ground fault of the load equipment passes through the core of the zero-phase current transformer from the neutral point on the secondary side of the transformer for transforming to the voltage for the control system circuit. A ground fault current line for flowing a ground fault current generated in a grounded control system circuit, and a ground fault detector for detecting a ground fault of the main circuit or the control system circuit on a secondary side of the zero-phase current transformer. And a ground fault detecting function for determining whether a ground fault is detected by the main circuit or the control system circuit by a detection output of the ground fault detector. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282888A JPH10112929A (en) | 1996-10-07 | 1996-10-07 | Line-to-ground fault detector for low-voltage activating panel circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282888A JPH10112929A (en) | 1996-10-07 | 1996-10-07 | Line-to-ground fault detector for low-voltage activating panel circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10112929A true JPH10112929A (en) | 1998-04-28 |
Family
ID=17658402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8282888A Pending JPH10112929A (en) | 1996-10-07 | 1996-10-07 | Line-to-ground fault detector for low-voltage activating panel circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10112929A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334458C (en) * | 2005-06-02 | 2007-08-29 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN100348990C (en) * | 2005-05-09 | 2007-11-14 | 昆明理工大学 | Adaptive approach for route selection of grounded system connected to arc suppression coil |
| CN100367043C (en) * | 2004-06-03 | 2008-02-06 | 昆明理工大学 | Fault selecting method by attenuated DC component |
| CN108535680A (en) * | 2018-03-30 | 2018-09-14 | 上海电机学院 | Residual current transformer fault self-diagnosis system and method |
-
1996
- 1996-10-07 JP JP8282888A patent/JPH10112929A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367043C (en) * | 2004-06-03 | 2008-02-06 | 昆明理工大学 | Fault selecting method by attenuated DC component |
| CN100348990C (en) * | 2005-05-09 | 2007-11-14 | 昆明理工大学 | Adaptive approach for route selection of grounded system connected to arc suppression coil |
| CN100334458C (en) * | 2005-06-02 | 2007-08-29 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN108535680A (en) * | 2018-03-30 | 2018-09-14 | 上海电机学院 | Residual current transformer fault self-diagnosis system and method |
| CN108535680B (en) * | 2018-03-30 | 2020-04-14 | 上海电机学院 | Fault self-diagnosis system and method for residual current transformer |
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