JPH07192584A - Current zero point cutoff control method of ac switch - Google Patents
Current zero point cutoff control method of ac switchInfo
- Publication number
- JPH07192584A JPH07192584A JP33404393A JP33404393A JPH07192584A JP H07192584 A JPH07192584 A JP H07192584A JP 33404393 A JP33404393 A JP 33404393A JP 33404393 A JP33404393 A JP 33404393A JP H07192584 A JPH07192584 A JP H07192584A
- Authority
- JP
- Japan
- Prior art keywords
- current
- zero point
- peak value
- switch
- high frequency
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/006—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電力系統を模擬した
模擬系統とその運転制御装置とからなる系統解析装置を
用いて交流遮断器の責務あるいは能力を解析するため
に、模擬系統に挿入され通過する交流電流を開閉する交
流スイッチを、この交流スイッチに高周波電流を通過さ
せたときにこの高周波電流を所望の電流零点で遮断する
ように制御する電流零点遮断制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is inserted in a simulated system in order to analyze the duty or capability of an AC circuit breaker by using a system analysis device comprising a simulated system simulating an electric power system and its operation control device. The present invention relates to a current zero point cutoff control method for controlling an AC switch that opens and closes a passing AC current so as to cut off the high frequency current at a desired current zero point when the high frequency current is passed through the AC switch.
【０００２】[0002]
【従来の技術】従来、系統解折装置に用いていた交流電
流は、模擬系統が事業用の電力系統を模擬した系統であ
ることから、周波数も電力系統の運転周波数に合わせて
いた。装置を電力系統の運転周波数で運用すると、電力
系統における定常的あるいは準定常的な回路現象が極め
て精度よく再現され、例えば、電力系統に三相短絡電流
が発生し、いずれかの相に零点を通過しない短絡電流が
流れている場合、どのような相順で電流遮断を行えば、
すべての相の電流に零点を通過させることができるか、
といったことを知るための運転周波数電流波形解析など
を効率よく行うことができる（特公昭６４−３０１６号
公報参照）。同様に、電流遮断が行われる電流零点近傍
の過渡的な回路現象も、運転周波数の交流電流を零点で
遮断することにより解析が可能である。2. Description of the Related Art Conventionally, the frequency of the alternating current used in the power system breaker is adjusted to the operating frequency of the power system because the simulated system is a system simulating a business power system. When the device is operated at the operating frequency of the electric power system, the steady or quasi-steady circuit phenomenon in the electric power system is reproduced very accurately, for example, a three-phase short-circuit current occurs in the electric power system, and a zero point is generated in either phase. If short-circuit current that does not pass is flowing, what kind of phase sequence should be used to interrupt the current?
Can the current of all phases be passed through the zero point,
It is possible to efficiently perform an operation frequency current waveform analysis or the like for knowing the above (see Japanese Patent Publication No. 64-3016). Similarly, a transient circuit phenomenon near the current zero point at which the current is interrupted can be analyzed by interrupting the alternating current at the operating frequency at the zero point.
【０００３】[0003]
【発明が解決しようとする課題】しかし、系統解析装置
を用いて実系統で用いられる遮断器の遮断能力、あるい
は遮断器に要求される責務（耐えるべき回路条件）を解
析しようとすると、系統解析装置として、電流遮断が行
われる運転周波数電流零点直前の電流変化率（ｄｉ／ｄ
ｔ：ｉは電流瞬間時値，ｔは時間）を実器のものと一致
させなければならない。現在製作されている遮断器は、
真空遮断器であるにせよ、あるいはＳＦ6ガス遮断器で
あるにせよ、電流零点までに発生するアークエネルギー
は、真空中の拡散あるいはガス吹付けによって次々にア
ークから遠ざかり、電流遮断の成否が、電流零点直前に
アークに注入されるエネルギーと遮断器の状態、すなわ
ち、電流零点直前の微小時間内にアークに注入される，
電流零点直前の電流変化率とアーク状態とによって量が
変化するエネルギーと、このエネルギーを遮断器がその
特性から電流零点通過時点までにどの程度まで奪うこと
ができる状態にあるかとによって大きく左右される性質
をもっている。従って、系統解析装置としては、実遮断
器に等しい電流変化率を有する電流を発生させることが
でき、かつ所望の電流変化率となる零点で電流を遮断さ
せる制御ができなければならない。実遮断器に等しい電
流変化率は、波高値は小さくても周波数の高い高周波電
流を用いることにより実現することができる。しかし、
インダクタンスや抵抗分を有する回路で交流電流を発生
させると、波高値が時間とともに減衰する電流となり、
図５に示すように、電流半波ごとに電流零点での電流変
化率が異なってくる。なお、図６に示すように、電力系
統の運転周波数に等しい周波数の交流電流を用い、かつ
交流スイッチとして例えばパワーＭＯＳＥＦＴを用いて
そのゲートに開閉信号を与えて截断状に電流を遮断する
ような方法では、所望の電流変化率を得ることは困難で
ある。However, if an attempt is made to analyze the breaking ability of a circuit breaker used in an actual system or the obligation required of the circuit breaker (circuit condition to be endured) by using a system analysis device, the system analysis will be performed. As a device, the current change rate (di / d) immediately before the operating frequency current zero point at which the current is cut off
(t: i is the instantaneous current value, and t is the time) must match those of the actual device. The circuit breaker currently manufactured is
Whether it is a vacuum circuit breaker or an SF 6 gas circuit breaker, the arc energy generated up to the current zero point will move away from the arc one after another due to diffusion in a vacuum or gas blowing, and the success or failure of the current cutoff will occur. The energy injected into the arc immediately before the current zero and the state of the circuit breaker, that is, the energy injected into the arc within the very short time immediately before the current zero,
It is greatly affected by the energy whose amount changes depending on the current change rate immediately before the current zero point and the arc state, and to what extent the circuit breaker can take this energy from its characteristics until the current zero point is passed. It has a property. Therefore, the system analysis device must be capable of generating a current having a current change rate equal to that of the actual circuit breaker and capable of controlling the current to be cut off at a zero point at which the desired current change rate is obtained. A current change rate equal to that of an actual circuit breaker can be realized by using a high frequency current having a high frequency even though the peak value is small. But,
When an alternating current is generated in a circuit that has inductance or resistance, the peak value becomes a current that decays over time,
As shown in FIG. 5, the current change rate at the current zero point differs for each current half wave. As shown in FIG. 6, an AC current having a frequency equal to the operating frequency of the electric power system is used, and a power MOSEFT is used as an AC switch to apply an opening / closing signal to its gate to interrupt the current in a chopped manner. With the method, it is difficult to obtain a desired current change rate.
【０００４】本発明の目的は、電流零点において所望の
電流変化率を有する，波高値が時間とともに減衰する高
周波電流を、電流変化率が所定値と一致する零点で遮断
させることのできる電流零点遮断制御方法を提供するこ
とである。An object of the present invention is to cut off a high-frequency current having a desired current change rate at a current zero point and having a crest value decaying with time at a zero point at which the current change rate matches a predetermined value. It is to provide a control method.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明においては、電流零点遮断制御方法を、高周
波電流の波高値が設定値を越えなくなったときにその最
初の波高値時点につづく最初の電流零点で電流を遮断さ
せる制御方法とするか、あるいは、電流の波の数を設定
し、高周波電流通電開始後の波の数が設定値に等しくな
ったときに、つづく最初の波の電流零点で電流を遮断さ
せる制御方法とする。In order to solve the above-mentioned problems, in the present invention, a current zero point cutoff control method is used in which the peak value of a high frequency current does not exceed a set value at the first peak value. The control method is to cut off the current at the first current zero point that follows, or when the number of current waves is set and the number of waves after the start of high-frequency current conduction becomes equal to the set value, the first wave that continues. The control method is to cut off the current at the current zero point.
【０００６】なお、上記電流設定値あるいは波数設定値
は、高周波電流の電源に回転式高周波発電機を用いると
きには、高周波電流を発生させる瞬間の高周波電源電圧
の位相と関連して設定するようにする。The current set value or wave number set value is set in relation to the phase of the high frequency power supply voltage at the moment when the high frequency current is generated when the rotary high frequency generator is used as the power supply of the high frequency current. .
【０００７】[0007]
【作用】波高値が時間とともに減衰する高周波電流の波
形は予め分っており、従って次の電流零点で所望の電流
変化率となる半波の波高値も予め知ることができる。こ
の半波の波高値よりわずかに大きい値を交流スイッチの
制御系に設定しておき、高周波電流の波高値が時間とと
もに減衰してこの波高値に到達しなくなったときに、こ
れを検出して交流スイッチに遮断信号を送ることによ
り、交流スイッチはこの波高値につづく最初の零点で電
流を遮断する。The waveform of the high-frequency current whose crest value decays with time is known in advance, so that the crest value of a half wave at which the desired current change rate is obtained at the next current zero point can be known in advance. A value slightly higher than the peak value of this half wave is set in the control system of the AC switch, and this is detected when the peak value of the high frequency current decays with time and does not reach this peak value. By sending a cutoff signal to the AC switch, the AC switch cuts off the current at the first zero following this peak value.
【０００８】また、所望の電流変化率となる電流零点
は、高周波電流の最初の零点から数えて何番目の零点で
あるかも予め知ることができる。従って、電流零点ごと
に例えばパルスを発生させながらパルスの数を積算し、
これを設定値と比較して１つ前の零点が検出されたとこ
ろで次の零点で遮断が行われるよう遮断信号を交流スイ
ッチに出すことにより、所望の電流変化率下での遮断が
可能になる。Further, it is also possible to know in advance the current zero point at which the desired current change rate is, which is the zero point counted from the first zero point of the high frequency current. Therefore, for example, for each current zero point, the number of pulses is integrated while generating pulses,
This is compared with the set value, and when a previous zero point is detected, a cutoff signal is output to the AC switch so that the cutoff is performed at the next zero point, so that the cutoff can be performed at a desired current change rate. .
【０００９】なお、所望の電流変化率と高精度に一致す
る電流変化率を有する高周波電流は、高周波電流の電源
に回転式高周波発電機を用いるときには、高周波電流発
生瞬時の高周波電源電圧の位相を制御して、高周波電流
に含まれる直流分を制御しないと得られない。従って、
上記電流値設定や波数設定を、高周波電流発生瞬時の高
周波電源電圧の位相と関連させて行うようにすることに
より、電流変化率をより高精度に所望値に一致させるこ
とができ、解析結果の精度を上げることができる。When a rotary high frequency generator is used as the power source of the high frequency current, the high frequency current having a current change rate that matches the desired current change rate with high accuracy is the phase of the high frequency power source voltage at the instant when the high frequency current is generated. It cannot be obtained unless the direct current component contained in the high frequency current is controlled by controlling. Therefore,
By performing the current value setting and the wave number setting in association with the phase of the high frequency power supply voltage at the instant when the high frequency current is generated, the current change rate can be more accurately matched to the desired value, and the analysis result The accuracy can be increased.
【００１０】[0010]
【実施例】図１および図３に請求項第１項記載の発明の
一実施例を示す。この実施例は、高周波電流を高周波電
源電圧の波高値で発生させて直流分が含まれないように
し、交流分波高値の減衰を待って電流を遮断することに
より電流零点での電流変化率を所望値と一致させようと
するものである。このために、図１に示すように、所望
の電流零点Ｄの直前の波高値Ｃよりわずかに大きい電流
値を正側と負側とに設定し、交流分波高値がＡのように
設定値を越えているときは遮断信号を出さず、従って次
の電流零点Ｂでは遮断させないようにし、交流分波高値
がＣのように初めて設定値以下となったときに遮断信号
を出して次の電流零点Ｄで遮断させる。FIG. 1 and FIG. 3 show an embodiment of the invention described in claim 1. In this embodiment, the high-frequency current is generated at the peak value of the high-frequency power supply voltage so that the direct current component is not included, and the current is cut off after waiting for the attenuation of the alternating current peak value to change the current change rate at the current zero point. It is intended to match the desired value. For this reason, as shown in FIG. 1, a current value slightly larger than the peak value C immediately before the desired current zero point D is set on the positive side and the negative side, and the set value such that the AC branching peak value is A. When it exceeds the current, the cutoff signal is not output. Therefore, the cutoff is not performed at the next current zero point B, and when the AC demultiplexing value is the set value or less for the first time, the cutoff signal is output and the next current is cut off. Shut off at zero point D.
【００１１】このような電流零点遮断制御を行うため
に、本実施例では、図３において、交流スイッチ１１に
は逆並列されたサイリスタを用い、両方のゲートに高周
波電源電圧の波高値でオン指令を与えて直流分を含まな
い高周波電流を発生させる。高周波電流が通る交流回路
には変流器（以下ＣＴと記す）１２を設け、ＣＴの２次
側に得られた電流を電流電圧変換装置１３に入力して変
換装置１３内の抵抗を通すことにより電流波形と同波形
の電圧に変換し、さらにこの電圧を同装置内の微分回路
を通して電圧波高値を比較器１４に入力する。一方、比
較器１４には、変圧器とそれぞれ２組の整流器，平滑コ
ンデンサ，分圧抵抗器とを用いることにより、出力する
正負の直流電圧をそれぞれ可変とした電圧設定装置１５
から図１に示したような設定電圧が入力されており、電
流電圧変換装置１３から比較器１４に入力された電圧が
比較器１４内の設定電圧を下まわったときにスイッチ制
御器１６に信号が出され、この信号によりスイッチ１１
の両方のゲートに与えられたオン指令がともに遮断さ
れ、高周波電流は遮断信号発信後の最初の電流零点で遮
断される。In order to perform such a current zero point cutoff control, in this embodiment, an anti-parallel thyristor is used as the AC switch 11 in FIG. 3 and both gates are turned on at the peak value of the high frequency power supply voltage. Is applied to generate a high-frequency current that does not include a DC component. A current transformer (hereinafter referred to as CT) 12 is provided in an AC circuit through which a high-frequency current passes, and the current obtained on the secondary side of CT is input to a current-voltage converter 13 to pass a resistance in the converter 13. Is converted into a voltage having the same waveform as the current waveform, and this voltage is input to the comparator 14 through the differentiating circuit in the device. On the other hand, as the comparator 14, a voltage setting device 15 is provided in which the positive and negative DC voltages to be output are made variable by using a transformer and two sets of rectifiers, smoothing capacitors, and voltage dividing resistors, respectively.
1 has been input, and when the voltage input from the current-voltage converter 13 to the comparator 14 falls below the set voltage in the comparator 14, a signal is sent to the switch controller 16. Is issued, and this signal causes the switch 11
The ON commands given to both the gates are cut off, and the high frequency current is cut off at the first current zero point after the cutoff signal is transmitted.
【００１２】図２および図４は請求項第２項記載の発明
の一実施例を示す。この実施例は、高周波電流に直流分
が含まれていても高周波電流発生後初めて所望の電流変
化率となる電流零点の位置５（図２）は予め知ることが
できるので、高周波電流発生後この電流零点となるまで
の零点の数５つより１つ少ない４つを算えたときに遮断
信号を出すことにより次の電流零点５で遮断しようとす
るものである。このために高周波電流発生後、各電流零
点でパルスを発生し、このパルス数が４個となったとき
に遮断信号を出して次の最初の電流零点で高周波電流を
遮断させる。2 and 4 show an embodiment of the invention described in claim 2. In this embodiment, it is possible to know in advance the position 5 (FIG. 2) of the current zero point at which the desired current change rate is obtained only after the high frequency current is generated even if the high frequency current contains a direct current component. It is intended to cut off at the next current zero point 5 by issuing a cutoff signal when 4 which is one less than the number of zeros until reaching the current zero point is calculated. Therefore, after the high frequency current is generated, a pulse is generated at each current zero point, and when the number of pulses is four, a cutoff signal is issued to cut off the high frequency current at the next first current zero point.
【００１３】このような電流零点遮断制御を行うため
に、本実施例では、図４において、高周波電流が通る交
流回路に設けたＣＴ１２の２次電流を電流電圧変換装置
１７に入力してＣＴ２次電流と同一波形の電圧に変換
し、この電圧を零点検出器８に入力して電圧波形の零点
ごとにパルスを発生させる。パルスの発生には例えば比
較器を用い、比較器内に零値をわずかに上まわる電圧を
比較電圧として設定し、電流電圧変換装置１７から入力
された電圧が比較電圧以下となった時点でパルスを発生
させる。このパルスの数をカウンタ１９で積算し、これ
を比較器２０に入力して、比較器２０内に予め零点数設
定装置２１内で設定して入力しておいた零点数と比較
し、入力パルス数が設定零点数と一致したときに遮断信
号をスイッチ制御器２２へ出力する。スイッチ制御器２
２では遮断信号を受けてスイッチ１の両方のゲートのオ
ン指令を遮断し、次の最初の電流零点で高周波電流を遮
断させる。In order to perform such a current zero cutoff control, in the present embodiment, in FIG. 4, the secondary current of the CT 12 provided in the AC circuit through which the high frequency current passes is input to the current-voltage converter 17 to input the CT secondary. The voltage is converted into a voltage having the same waveform as the current, and this voltage is input to the zero detector 8 to generate a pulse at each zero of the voltage waveform. For example, a comparator is used to generate the pulse, and a voltage slightly exceeding a zero value is set as the comparison voltage in the comparator, and the pulse is generated when the voltage input from the current-voltage converter 17 becomes equal to or lower than the comparison voltage. Generate. The number of pulses is integrated by the counter 19, which is input to the comparator 20 to be compared with the number of zero points set and input in the zero point number setting device 21 in advance in the comparator 20 to obtain the input pulse. When the number matches the set zero point, the cutoff signal is output to the switch controller 22. Switch controller 2
In step 2, the ON signal to both gates of the switch 1 is cut off in response to the cutoff signal, and the high frequency current is cut off at the next first current zero point.
【００１４】[0014]
【発明の効果】以上に述べたように、本発明によれば、
高周波電流を任意の零点で遮断できるので、実系統で用
いられる遮断器の場合と等しい電流変化率を示す時点で
電流を遮断することができ、実系統で用いられる遮断器
に要求される回路条件や遮断器の能力などの解析を高精
度で行うことができる。しかも、この制御方法は、通常
用いられている制御手段を組み合わせて簡易に実現でき
るメリットを有する。As described above, according to the present invention,
Since the high-frequency current can be interrupted at any zero point, the current can be interrupted at the time when the current change rate is equal to that of the circuit breaker used in the actual system, and the circuit condition required for the circuit breaker used in the actual system. It is possible to analyze with high accuracy the capability of the circuit breaker and the circuit breaker. Moreover, this control method has an advantage that it can be easily realized by combining commonly used control means.
【図１】請求項第１項記載の発明による電流零点遮断制
御方法を説明する波形図FIG. 1 is a waveform diagram for explaining a current zero point cutoff control method according to the invention of claim 1.
【図２】請求項第２項記載の発明による電流零点遮断制
御方法を説明する図であって、同図（ａ）は電流変化率
が所望値と一致する零点までの零点の数を例示する高周
波電流波形図、同図（ｂ）は同図（ａ）に示した高周波
電流波形を対象として電流変化率が所望値と一致する零
点までに発生させる零点パルスの数を示す図FIG. 2 is a diagram for explaining a current zero point cutoff control method according to the second aspect of the present invention, in which FIG. 2 (a) illustrates the number of zero points up to a zero point at which the current change rate matches a desired value. High-frequency current waveform diagram, FIG. 9B is a diagram showing the number of zero-point pulses generated up to the zero point at which the current change rate matches the desired value, targeting the high-frequency current waveform shown in FIG.
【図３】図１による電流零点遮断制御方法を実現させる
制御系構成の一実施例を示す機能ブロック図3 is a functional block diagram showing an embodiment of a control system configuration for realizing the current zero point cutoff control method according to FIG.
【図４】図３による電流零点遮断制御方法を実現させる
制御系構成の一実施例を示す機能ブロック図FIG. 4 is a functional block diagram showing an embodiment of a control system configuration for realizing the current zero point cutoff control method according to FIG.
【図５】零点ごとに電流変化率が変化する高周波電流波
形の一例を示す波形図FIG. 5 is a waveform diagram showing an example of a high-frequency current waveform in which the current change rate changes at each zero point.
【図６】運転周波電流を用いて所望の電流変化率を得よ
うとする方法の一例を示す波形図FIG. 6 is a waveform diagram showing an example of a method for obtaining a desired current change rate by using an operating frequency current.
１１ スイッチ（交流スイッチ） １２ ＣＴ（変流器） １３ 電流電圧変換装置 １４ 比較器 １５ 電圧設定装置 １６ スイッチ制御器 １７ 電流電圧変換装置 １８ 零点検出器 １９ カウンタ ２０ 比較器 ２１ 零点数設定装置 ２２ スイッチ制御器 11 switch (AC switch) 12 CT (current transformer) 13 current-voltage converter 14 comparator 15 voltage setting device 16 switch controller 17 current-voltage converter 18 zero point detector 19 counter 20 comparator 21 zero-point setting device 22 switch Controller
Claims (3)
開閉信号を受けてスイッチ要素がオン・オフして交流回
路を開閉する交流スイッチを、インダクタンスを含む交
流回路に流れる，波高値が時間とともに減衰する高周波
電流を所望の電流零点で遮断するように制御する方法で
あって、波高値が設定値を越えなくなったときにその最
初の波高値時点につづく最初の電流零点で電流を遮断さ
せることを特徴とする交流スイッチの電流零点遮断制御
方法。1. An AC switch which is inserted into an AC circuit including an inductance and which opens and closes the AC circuit when a switching element is turned on / off in response to a switching signal, flows into the AC circuit including an inductance, and a peak value is attenuated with time. It is a method to control so that the high frequency current is cut off at a desired current zero point, and when the peak value does not exceed the set value, the current is cut off at the first current zero point following the point of the first peak value. And a method for controlling the zero point of the AC switch current.
開閉信号を受けてスイッチ要素がオン・オフして交流回
路を開閉する交流スイッチを、インダクタンスを含む交
流回路に流れる，波高値が時間とともに減衰する高周波
電流を所望の電流零点で遮断するように制御する方法で
あって、電流の波の数を設定し、高周波電流通電開始後
の波の数が設定値に等しくなったときに、つづく最初の
波の電流零点で電流を遮断させることを特徴とする交流
スイッチの電流零点遮断制御方法。2. An AC switch which is inserted into an AC circuit including an inductance and which opens and closes the AC circuit when a switching element is turned on / off in response to a switching signal, flows into the AC circuit including an inductance, and a peak value is attenuated with time. It is a method to control the high frequency current to be cut off at a desired current zero point, and when the number of current waves is set and the number of waves after the start of high frequency current conduction becomes equal to the set value, the first A current zero cutoff control method for an AC switch, characterized in that a current is cut off at a current zero of a wave.
法において、設定値は、高周波電流の電源に回転式高周
波発電機を用いるときには、高周波電流を発生させる瞬
間の高周波電源電圧の位相と関連して設定することを特
徴とする交流スイッチの電流零点制御方法。3. The control method according to claim 1 or 2, wherein the set value is a value of a high frequency power supply voltage at a moment when the high frequency current is generated when a rotary high frequency generator is used as a power supply of the high frequency current. A method for controlling a current zero point of an AC switch, which is set in association with a phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33404393A JPH07192584A (en) | 1993-12-28 | 1993-12-28 | Current zero point cutoff control method of ac switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33404393A JPH07192584A (en) | 1993-12-28 | 1993-12-28 | Current zero point cutoff control method of ac switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07192584A true JPH07192584A (en) | 1995-07-28 |
Family
ID=18272874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33404393A Withdrawn JPH07192584A (en) | 1993-12-28 | 1993-12-28 | Current zero point cutoff control method of ac switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07192584A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001095356A1 (en) | 2000-06-07 | 2001-12-13 | Abb Ab | A method and an apparatus for controlling an electric switching device |
| JP2008529227A (en) * | 2005-01-31 | 2008-07-31 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for determining the closing time of an electrical switchgear |
-
1993
- 1993-12-28 JP JP33404393A patent/JPH07192584A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001095356A1 (en) | 2000-06-07 | 2001-12-13 | Abb Ab | A method and an apparatus for controlling an electric switching device |
| EP1309979B1 (en) * | 2000-06-07 | 2008-06-18 | Abb Ab | A method and an apparatus for controlling an electric switching device |
| EP1933346A1 (en) * | 2000-06-07 | 2008-06-18 | Abb Ab | A method and an apparatus for controlling an electric switching device |
| JP2008529227A (en) * | 2005-01-31 | 2008-07-31 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for determining the closing time of an electrical switchgear |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A761 | Written withdrawal of application |
Effective date: 20031224 Free format text: JAPANESE INTERMEDIATE CODE: A761 |