JPH11136852A - Power storage system - Google Patents
Power storage systemInfo
- Publication number
- JPH11136852A JPH11136852A JP9294172A JP29417297A JPH11136852A JP H11136852 A JPH11136852 A JP H11136852A JP 9294172 A JP9294172 A JP 9294172A JP 29417297 A JP29417297 A JP 29417297A JP H11136852 A JPH11136852 A JP H11136852A
- Authority
- JP
- Japan
- Prior art keywords
- power storage
- storage device
- power
- value
- ground fault
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、非接地の直流電
力貯蔵装置と、１線が接地された交流電源と、直流電力
貯蔵装置と交流電源との間に接続される非絶縁型の双方
向電力変換装置とで構成される電力貯蔵システムにおけ
る直流電力貯蔵装置が地絡故障した時にも安全に直流電
力貯蔵装置を切り離すことを可能とする電力貯蔵システ
ムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-grounded DC power storage device, an AC power supply having one line grounded, and a non-isolated bi-directional power supply connected between the DC power storage device and the AC power supply. The present invention relates to a power storage system capable of safely disconnecting a DC power storage device even when a DC fault occurs in a DC power storage device in a power storage system including a power conversion device.
【０００２】[0002]
【従来の技術】図５は、１線が接地された商用交流電源
と、直流電力貯蔵装置と絶縁型の双方向電力変換装置と
で構成される直流電力貯蔵システムにおける直流電力貯
蔵装置の地絡故障が生じた状態とその検出方法の従来例
である。ここで、１は商用交流電源、２０は絶縁型の双
方向電力変換装置、３ａ，３ｂは双方向電力変換装置と
直流電力貯蔵装置との接続点、４は直流電力貯蔵装置、
５は直流電力貯蔵装置の一部が地絡故障を起こした場合
の地絡抵抗、６ａ，６ｂは地絡検出用抵抗、７ａ，７ｂ
は検出抵抗切替用スイッチ、８は遮断器、９は絶縁変圧
器を表す。双方向電力変換装置２０は、直流電力貯蔵装
置４への充電時は商用交流電源１の整流装置として、ま
た直流電力貯蔵装置４からの放電時は商用交流電源１へ
の連系インバータとして高周波スイッチング動作を行
う。直流電力貯蔵装置４の一部で地絡故障が発生した場
合、地絡箇所と大地間に地絡抵抗５が生じる。この地絡
抵抗５の値を検出し基準値以下になった場合に遮断器８
を動作させるなどの対策がとられる。地絡抵抗５の値の
検出方法としては、絶縁変圧器９により直流電力貯蔵装
置４と大地間が絶縁されているため、地絡検出用抵抗６
ａ，６ｂによる電圧検出法が可能である。検出抵抗切替
用スイッチ７ａをオン、検出抵抗切替用スイッチ７ｂを
オフとした状態で地絡検出用抵抗６ａの両端電圧を測定
し、逆に検出抵抗切替用スイッチ７ａをオフ、検出抵抗
切替用スイッチ７ｂをオンとした状態で地絡検出用抵抗
６ｂの両端電圧を測定する。これらの電圧値と地絡検出
用抵抗６ａ，６ｂの抵抗値および直流電力貯蔵装置４の
両端電圧より地絡抵抗５の値が算出できる。この地絡抵
抗５の値が基準値以下になった場合に遮断器８を動作さ
せる。2. Description of the Related Art FIG. 5 shows a ground fault of a DC power storage device in a DC power storage system composed of a commercial AC power supply having one line grounded, a DC power storage device and an isolated bidirectional power converter. It is a conventional example of a state in which a failure has occurred and a detection method thereof. Here, 1 is a commercial AC power supply, 20 is an insulation type bidirectional power converter, 3a and 3b are connection points between the bidirectional power converter and the DC power storage device, 4 is a DC power storage device,
5 is a ground fault resistance when a part of the DC power storage device has a ground fault, 6a and 6b are ground fault detecting resistors, 7a and 7b
Denotes a detection resistance switch, 8 denotes a circuit breaker, and 9 denotes an insulating transformer. The bidirectional power converter 20 operates as a rectifier of the commercial AC power supply 1 when charging the DC power storage device 4 and as an inverter connected to the commercial AC power supply 1 when discharging from the DC power storage device 4. Perform the operation. When a ground fault occurs in a part of the DC power storage device 4, a ground fault resistor 5 is generated between the ground fault location and the ground. When the value of the ground fault resistance 5 is detected and becomes equal to or less than the reference value, the circuit breaker 8 is activated.
And other measures are taken. The method of detecting the value of the ground fault resistance 5 is as follows. Since the DC power storage device 4 is insulated from the ground by the insulating transformer 9,
The voltage detection method by a and 6b is possible. With the detection resistance switching switch 7a turned on and the detection resistance switching switch 7b turned off, the voltage across the ground fault detection resistance 6a is measured. Conversely, the detection resistance switching switch 7a is turned off, and the detection resistance switching switch is turned off. With the switch 7b turned on, the voltage between both ends of the ground fault detecting resistor 6b is measured. The value of the ground fault resistor 5 can be calculated from these voltage values, the resistance values of the ground fault detecting resistors 6a and 6b, and the voltage across the DC power storage device 4. When the value of the ground fault resistance 5 becomes equal to or less than the reference value, the circuit breaker 8 is operated.
【０００３】[0003]
【発明が解決しようとする課題】従来の方法は、絶縁変
圧器で直流電力貯蔵装置と大地間が絶縁されている場合
のみに適用でき、直流電力貯蔵装置と大地間が非絶縁の
場合には適用できないという問題があった。The conventional method can be applied only when the DC power storage device and the ground are insulated by an insulating transformer, and when the DC power storage device and the ground are not insulated. There was a problem that it could not be applied.
【０００４】本発明は上記の事情に鑑みてなされたもの
で、非絶縁型の電力貯蔵システムにおける直流電力貯蔵
装置の地絡故障検出を容易に行い、地絡時に安全に電力
貯蔵装置を切り離す電力貯蔵システムを提供することを
目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to easily detect a ground fault in a DC power storage device in a non-insulated type power storage system and to safely disconnect the power storage device in the event of a ground fault. It is intended to provide a storage system.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明の電力貯蔵システムは、商用交流電源と直流電
力貯蔵装置との間に接続される非絶縁型の双方向電力変
換装置よりなる電力貯蔵システムにおいて、前記直流電
力貯蔵装置の充放電電流のうち不平衡電流の交流成分を
検出値として検出する検出手段と、前記検出手段で検出
した検出値が基準値を超えたとき直流電力貯蔵装置を切
り離す切離手段とを具備したことを特徴とするものであ
る。In order to achieve the above object, a power storage system according to the present invention comprises a non-isolated bidirectional power converter connected between a commercial AC power supply and a DC power storage device. In the power storage system, detecting means for detecting, as a detection value, an AC component of an unbalanced current among charging and discharging currents of the DC power storage device, and detecting the DC power when the detection value detected by the detecting means exceeds a reference value. And separating means for separating the device.
【０００６】また本発明の電力貯蔵システムは、非接地
の直流電力貯蔵装置と、１線が接地された商用交流電源
と、前記直流電力貯蔵装置と前記商用交流電源との間に
接続される非絶縁型の双方向電力変換装置とで構成され
る電力貯蔵システムにおいて、前記直流電力貯蔵装置を
充放電する双方向電力変換装置の充放電電流の不平衡電
流を検出する電流センサと、前記電流センサで検出され
た不平衡電流の交流電源周波数成分を通過させる帯域通
過フィルタと、前記帯域通過フィルタの出力値が前記直
流電力貯蔵装置の両端電圧を許容される地絡抵抗値で除
した値を超えたとき信号を出力する比較器と、前記比較
器の出力信号により前記直流電力貯蔵装置を切り離す手
段とを具備したことを特徴とするものである。[0006] The power storage system of the present invention comprises an ungrounded DC power storage device, a commercial AC power supply having one line grounded, and a non-grounded DC power storage device connected between the DC power storage device and the commercial AC power supply. In a power storage system including an insulated bidirectional power conversion device, a current sensor for detecting an unbalanced charging / discharging current of the bidirectional power conversion device for charging / discharging the DC power storage device, and the current sensor A band-pass filter that passes the AC power supply frequency component of the unbalanced current detected in the above, and the output value of the band-pass filter exceeds a value obtained by dividing the voltage across the DC power storage device by an allowable ground fault resistance value. And a means for disconnecting the DC power storage device according to the output signal of the comparator.
【０００７】また本発明の電力貯蔵システムは、前記帯
域通過フィルタの出力値が直流電力貯蔵装置の両端電圧
を地絡抵抗値の２倍で割った値であることを特徴とする
ものである。本発明は前記のような手段を講ずるので、
非絶縁型の電力貯蔵システムにおける直流電力貯蔵装置
の地絡故障検出を行うことができる。In the power storage system according to the present invention, the output value of the band-pass filter is a value obtained by dividing a voltage between both ends of the DC power storage device by twice a ground fault resistance value. Since the present invention takes the above measures,
A ground fault of a DC power storage device in a non-insulated power storage system can be detected.
【０００８】[0008]
【発明の実施の形態】以下図面を参照して本発明の実施
の形態例を詳細に説明する。図１は本発明の一実施形態
例を示す回路図である。ここで、１はｕ相、ｖ相、ｗ相
よりなり１線が接地された商用交流電源、２は直流電力
貯蔵装置を充放電する絶縁トランスを用いていない非絶
縁型の双方向電力変換装置、３ａ，３ｂは双方向電力変
換装置と直流電力貯蔵装置との接続点、４は非接地の直
流電力貯蔵装置、５は直流電力貯蔵装置の一部が地絡故
障を起こした場合の地絡抵抗、８は遮断器、１０は各相
にそれぞれ対応してＨ側またはＬ側にオンさせる高周波
スイッチ、１１は双方向電力変換装置の充放電電流の不
平衡電流を検出する電流センサ、１２は除算器、１３は
電流センサで検出した不平衡電流の交流電源周波数成分
を通過させる帯域通過フィルタ、１４は比較器、１５
１，１５２，１５３，１５４はコンデンサ、１６１，１
６２，１６３はインダクタを表す。双方向電力変換装置
２は、直流電力貯蔵装置４への充電時は商用交流電源１
の整流装置として、また直流電力貯蔵装置４からの放電
時は商用交流電源１への連系インバータとして高周波ス
イッチング動作を行う。直流電力貯蔵装置４が地絡故障
した場合、地絡抵抗５に地絡電流が流れ、その電流が接
続点３ａまたは３ｂを通過し商用交流電源１のｗ相の接
地点に流れ込むため、接続点３ａと３ｂの電流は不平衡
となる。従って、その不平衡電流すなわち地絡電流を検
出することにより地絡故障の検知が可能となる。地絡電
流は交流成分と直流成分を有しているが、直流成分は地
絡箇所と大地間の電圧差に依存するため交流成分のみを
検出する必要がある。以下にその理由を説明をする。地
絡電流は地絡箇所と大地間の電圧差と地絡抵抗５の抵抗
値で決まる。地絡箇所と大地間の電圧波形は高周波スイ
ッチ１０の制御方法により異なるため、ここでは一例に
ついて述べる。図２のように各相電圧を基準の三角波と
比較し、その電圧関係で各相に対応する高周波スイッチ
１０をＨ側またはＬ側にオンさせる。図３は、この場合
の接続点３ａ，３ｂの大地に対する電圧波形を示したも
のである。スイッチングにより高周波で変動している
が、平均値は波線で示すように振幅がＶ／２で商用交流
周期の正弦波となる。これより、地絡箇所と大地間の電
圧差を地絡抵抗５の抵抗値で割った値である地絡電流の
直流成分は地絡箇所に依存するが、交流成分は地絡箇所
に依らないことが分かる。以上説明したように地絡故障
を検知するためには、まず地絡電流の交流成分のみを電
流センサ１１で検出する。また、電流センサ１１で検出
した交流成分のうちスイッチング周波数成分は雷サージ
などのノイズの影響を受けやすいため、商用交流周波数
成分のみを取り出すため帯域通過フィルタ１３を用い
る。前記帯域通過フィルタ１３の出力は、図４に示すよ
うに直流電力貯蔵装置４の両端電圧Ｖを地絡抵抗５の値
Ｒｇの２倍で割った値が振幅となる波形である。前記帯
域通過フィルタ１３の出力は検出値として比較器１４に
おいて基準値と比較される。検出値が基準値を超えた場
合は比較器１４から信号が出力され、遮断器８の動作な
どの対処がなされ直流電力貯蔵装置４が切り離される。
地絡故障と判定する地絡抵抗５の値をＲｓとすると、比
較器１４に入力する基準値としては、除算器１２におい
て直流電力貯蔵装置４の両端電圧Ｖを許容される地絡抵
抗値Ｒｓで割った値を用いる。即ち、本実施形態例によ
ると従来例では不可能だった、非絶縁型の電力貯蔵シス
テムにおける、直流電力貯蔵装置４の地絡故障検出を行
うことができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention. Here, 1 is a commercial AC power supply composed of u-phase, v-phase, and w-phase and one line is grounded, and 2 is a non-insulated bidirectional power converter that does not use an insulating transformer for charging and discharging a DC power storage device. Reference numerals 3a and 3b denote connection points between the bidirectional power converter and the DC power storage device, 4 denotes an ungrounded DC power storage device, and 5 denotes a ground fault when a part of the DC power storage device causes a ground fault. A resistor, 8 is a circuit breaker, 10 is a high-frequency switch that turns on the H side or L side corresponding to each phase, 11 is a current sensor that detects an unbalanced charge / discharge current of the bidirectional power converter, and 12 is A divider 13 is a band-pass filter that passes an AC power frequency component of the unbalanced current detected by the current sensor, 14 is a comparator, 15
1,152,153,154 are capacitors, 161,1
62 and 163 represent inductors. When charging the DC power storage device 4, the bidirectional power conversion device 2
And performs a high-frequency switching operation as an inverter connected to the commercial AC power supply 1 when the DC power storage device 4 discharges. When the DC power storage device 4 has a ground fault, a ground fault current flows through the ground fault resistor 5, and the current flows through the connection point 3a or 3b and flows into the w-phase ground point of the commercial AC power supply 1. The currents in 3a and 3b become unbalanced. Therefore, it is possible to detect a ground fault by detecting the unbalanced current, that is, the ground fault current. Although the ground fault current has an AC component and a DC component, it is necessary to detect only the AC component because the DC component depends on the voltage difference between the ground fault location and the ground. The reason will be described below. The ground fault current is determined by the voltage difference between the ground fault location and the ground and the resistance value of the ground fault resistor 5. Since the voltage waveform between the ground fault location and the ground varies depending on the control method of the high-frequency switch 10, an example will be described here. As shown in FIG. 2, each phase voltage is compared with a reference triangular wave, and the high frequency switch 10 corresponding to each phase is turned on to the H side or the L side based on the voltage relationship. FIG. 3 shows a voltage waveform with respect to the ground at the connection points 3a and 3b in this case. Although the frequency fluctuates at a high frequency due to the switching, the average value is a sine wave of a commercial AC cycle having an amplitude of V / 2 as indicated by a broken line. Thus, the DC component of the ground fault current, which is a value obtained by dividing the voltage difference between the ground fault location and the ground by the resistance value of the ground fault resistor 5, depends on the ground fault location, but the AC component does not depend on the ground fault location. You can see that. As described above, in order to detect a ground fault, first, only the AC component of the ground fault current is detected by the current sensor 11. Since the switching frequency component among the AC components detected by the current sensor 11 is easily affected by noise such as lightning surge, the band-pass filter 13 is used to extract only the commercial AC frequency component. The output of the band-pass filter 13 has a waveform whose amplitude is a value obtained by dividing the voltage V across the DC power storage device 4 by twice the value Rg of the ground fault resistor 5 as shown in FIG. The output of the band-pass filter 13 is compared with a reference value in a comparator 14 as a detection value. When the detected value exceeds the reference value, a signal is output from the comparator 14, a countermeasure such as an operation of the circuit breaker 8 is taken, and the DC power storage device 4 is disconnected.
Assuming that the value of the ground fault resistor 5 for determining a ground fault is Rs, the reference value input to the comparator 14 is a ground fault resistance value Rs at which the voltage V across the DC power storage device 4 in the divider 12 is allowed. Use the value divided by. That is, according to the present embodiment, it is possible to detect the ground fault of the DC power storage device 4 in the non-insulated power storage system, which is impossible in the conventional example.
【０００９】[0009]
【発明の効果】以上説明したように本発明によれば、非
絶縁型の電力貯蔵システムにおける、直流電力貯蔵装置
の地絡故障検出を行うことができる。従って、絶縁型の
電力貯蔵システムに比べて絶縁変圧器を削除することに
より小形化、高効率化、低コスト化が可能な非絶縁型の
電力貯蔵システムの安全確保が可能となる。なお、直流
電力貯蔵装置としては例えば蓄電池、コンデンサ、Ｎａ
Ｓ電池等が考えられる。As described above, according to the present invention, a ground fault of a DC power storage device can be detected in a non-insulated power storage system. Therefore, by removing the insulating transformer as compared with the insulated power storage system, it is possible to secure the safety of the non-insulated power storage system that can be reduced in size, increased in efficiency, and reduced in cost. In addition, as a DC power storage device, for example, a storage battery, a capacitor, Na
An S battery or the like is conceivable.
【図１】本発明の一実施形態例を示す回路構成説明図で
ある。FIG. 1 is an explanatory diagram of a circuit configuration showing an embodiment of the present invention.
【図２】本発明の一実施形態例に係る高周波スイッチの
制御方法を示す信号波形説明図である。FIG. 2 is a signal waveform explanatory diagram showing a control method of a high-frequency switch according to an embodiment of the present invention.
【図３】本発明の一実施形態例に係る双方向電力変換装
置と直流電力貯蔵装置との接続点の大地に対する電圧変
動波形を示す波形図である。FIG. 3 is a waveform diagram illustrating a voltage fluctuation waveform with respect to the ground at a connection point between the bidirectional power converter and the DC power storage device according to the embodiment of the present invention.
【図４】本発明の一実施形態例に係る帯域通過フィルタ
の出力波形を示す波形図である。FIG. 4 is a waveform diagram showing an output waveform of a band-pass filter according to one embodiment of the present invention.
【図５】従来の電力貯蔵システムを示す回路構成図であ
る。FIG. 5 is a circuit configuration diagram showing a conventional power storage system.
１…商用交流電源、２…非絶縁型の双方向電力変換装
置、３ａ，３ｂ…双方向電力変換装置と直流電力貯蔵装
置との接続点、４…非接地の直流電力貯蔵装置、５…直
流電力貯蔵装置の一部が地絡故障を起こした場合の地絡
抵抗、８…遮断器、１０…各相にそれぞれ対応してＨ側
またはＬ側にオンさせる高周波スイッチ、１１…電流セ
ンサ、１２…除算器、１３…帯域通過フィルタ、１４…
比較器。DESCRIPTION OF SYMBOLS 1 ... Commercial AC power supply, 2 ... Non-insulation type bidirectional power converter, 3a, 3b ... Connection point of bidirectional power converter and DC power storage, 4 ... Non-grounded DC power storage, 5 ... DC Ground fault resistance when a part of the power storage device has a ground fault, 8: Breaker, 10: High-frequency switch for turning on the H side or L side corresponding to each phase, 11: Current sensor, 12 ... Divider, 13 ... Bandpass filter, 14 ...
Comparator.
Claims (3)
に接続される非絶縁型の双方向電力変換装置よりなる電
力貯蔵システムにおいて、 前記直流電力貯蔵装置の充放電電流のうち不平衡電流の
交流成分を検出値として検出する検出手段と、 前記検出手段で検出した検出値が基準値を超えたとき直
流電力貯蔵装置を切り離す切離手段とを具備したことを
特徴とする電力貯蔵システム。1. A power storage system comprising a non-isolated bidirectional power converter connected between a commercial AC power supply and a DC power storage device, wherein an unbalanced current among charging and discharging currents of the DC power storage device is provided. A power storage system comprising: a detection unit that detects the AC component as a detection value; and a disconnection unit that disconnects the DC power storage device when the detection value detected by the detection unit exceeds a reference value.
地された商用交流電源と、前記直流電力貯蔵装置と前記
商用交流電源との間に接続される非絶縁型の双方向電力
変換装置とで構成される電力貯蔵システムにおいて、 前記直流電力貯蔵装置を充放電する双方向電力変換装置
の充放電電流の不平衡電流を検出する電流センサと、 前記電流センサで検出された不平衡電流の交流電源周波
数成分を通過させる帯域通過フィルタと、 前記帯域通過フィルタの出力値が前記直流電力貯蔵装置
の両端電圧を許容される地絡抵抗値で除した値を超えた
とき信号を出力する比較器と、 前記比較器の出力信号により前記直流電力貯蔵装置を切
り離す手段とを具備したことを特徴とする電力貯蔵シス
テム。2. An ungrounded DC power storage device, a commercial AC power supply having one line grounded, and a non-isolated bidirectional power converter connected between the DC power storage device and the commercial AC power supply. A power sensor configured to detect an unbalanced current of a charge / discharge current of a bidirectional power converter that charges / discharges the DC power storage device; and an unbalanced current detected by the current sensor. A band-pass filter that passes the AC power supply frequency component, and a comparison that outputs a signal when an output value of the band-pass filter exceeds a value obtained by dividing a voltage across the DC power storage device by an allowable ground fault resistance value. And a means for disconnecting the DC power storage device according to an output signal of the comparator.
蔵装置の両端電圧を地絡抵抗値の２倍で割った値である
ことを特徴とする請求項２記載の電力貯蔵システム。3. The power storage system according to claim 2, wherein an output value of the band-pass filter is a value obtained by dividing a voltage between both ends of the DC power storage device by twice a ground fault resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29417297A JP3403928B2 (en) | 1997-10-27 | 1997-10-27 | Power storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29417297A JP3403928B2 (en) | 1997-10-27 | 1997-10-27 | Power storage system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11136852A true JPH11136852A (en) | 1999-05-21 |
| JP3403928B2 JP3403928B2 (en) | 2003-05-06 |
Family
ID=17804252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29417297A Expired - Fee Related JP3403928B2 (en) | 1997-10-27 | 1997-10-27 | Power storage system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3403928B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6927955B2 (en) | 2001-09-26 | 2005-08-09 | Canon Kabushiki Kaisha | Apparatus and method of detecting ground fault in power conversion system |
| JP2012253952A (en) * | 2011-06-03 | 2012-12-20 | Jfe Engineering Corp | Fast charger, fast charging apparatus and fast charging method |
| WO2013015097A1 (en) * | 2011-07-22 | 2013-01-31 | 三洋電機株式会社 | Electricity storage system and system interconnection system using same |
-
1997
- 1997-10-27 JP JP29417297A patent/JP3403928B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6927955B2 (en) | 2001-09-26 | 2005-08-09 | Canon Kabushiki Kaisha | Apparatus and method of detecting ground fault in power conversion system |
| JP2012253952A (en) * | 2011-06-03 | 2012-12-20 | Jfe Engineering Corp | Fast charger, fast charging apparatus and fast charging method |
| WO2013015097A1 (en) * | 2011-07-22 | 2013-01-31 | 三洋電機株式会社 | Electricity storage system and system interconnection system using same |
| JPWO2013015097A1 (en) * | 2011-07-22 | 2015-02-23 | 三洋電機株式会社 | Power storage system and grid interconnection system using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3403928B2 (en) | 2003-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2309280B1 (en) | Ground fault sensing device | |
| US6856137B2 (en) | Ground fault detection system and method | |
| US7012435B2 (en) | State detecting method and insulation resistance fall detector | |
| JP2005114496A (en) | State detection method and insulation resistance deterioration detector | |
| US9692314B2 (en) | Detection circuit and three-phase AC-to-AC power converting apparatus incorporating the same | |
| US7486491B2 (en) | Ground detector and DC-AC inverter for vehicles | |
| WO2016035159A1 (en) | In-vehicle charging device | |
| JPS6258213B2 (en) | ||
| JP2000152643A (en) | Power-converting device | |
| CA2340473C (en) | Ground fault interrupter | |
| JP2004212376A (en) | Leakage detecting device | |
| JP2004343972A (en) | Electric leakage detection device | |
| KR101527366B1 (en) | Arc detection circuit by contact failure | |
| JPH11136852A (en) | Power storage system | |
| JP4027727B2 (en) | In-vehicle ground insulation circuit coupling capacitor type leakage detector | |
| JPH0888941A (en) | Determining device of quality of storage battery for uninterruptible power supply unit | |
| JPH05223906A (en) | Ground fault detection controller | |
| JP3910357B2 (en) | Electric vehicle control device | |
| CN215894753U (en) | Insulation impedance detection circuit, equipment and vehicle | |
| WO2005019845A1 (en) | Threshold adjustment accuracy for ground fault condition determination | |
| EP4014293A1 (en) | Direct current power supply assembly provided with fault detection system | |
| WO2007064894A2 (en) | Charge and weld gating system with safety circuit | |
| JP2000023470A (en) | Transformerless inverter protection apparatus | |
| US20230400530A1 (en) | Common mode voltage feed fault protection | |
| RU2444103C2 (en) | Device to monitor charging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080229 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090228 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090228 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100228 Year of fee payment: 7 |
|
| LAPS | Cancellation because of no payment of annual fees |