Study on high frequency current interruption characteristics of vacuum circuit breaker

Koki Kojima, Ryoji Oshiro, E. Kaneko
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引用次数: 3

Abstract

It is well known that vacuum circuit breakers (VCB) have such superior characteristics as small size, light weight, small noise, frequent interruption, easy maintenance, and no decomposition products emission. On the other hand, some kind of surge generation may be their only one drawback. Just after the small current interruption with a very short arcing time, a repetitive re-ignition or three phase simultaneous interruption sometimes occurs. Surges related to these phenomena are considered the serious causes of insulation damage of the equipment in distribution power systems. In order to clarify these surge generation mechanisms, we did the experiment on the high frequency (HF) current interruption and the recovery characteristics of VCB with very short arcing time. We investigated the effect of a high frequency current on the dielectric recovery characteristics after the high frequency current interruption by means of synthetic test circuit in short electrode gap. For experiment parameters, we changed HF current frequency, amplitude of HF current values (about 350A and 750A) and impulse voltage (less than 8kV), arcing time(several hundred micro seconds) and delay time of impulse voltage application after HF current interrupted(several micro seconds). In this paper, the result of experiment will be reported.
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真空断路器高频断流特性研究
众所周知,真空断路器(VCB)具有体积小、重量轻、噪音小、中断频繁、维修方便、无分解产物排放等优越特点。另一方面,某种浪涌发电可能是它们唯一的缺点。在短电弧时间的小电流中断之后,有时会发生重复重燃或三相同时中断。与这些现象相关的浪涌被认为是配电系统中设备绝缘损坏的严重原因。为了弄清这些浪涌产生的机理,我们对极短电弧时间下的空压断路器的高频电流中断和恢复特性进行了实验研究。利用短电极间隙合成测试电路,研究了高频电流中断后高频电流对介质恢复特性的影响。在实验参数上,我们改变了高频电流频率、高频电流值幅值(约350A和750A)、冲击电压(小于8kV)、电弧时间(几百微秒)和高频电流中断后冲击电压施加延迟时间(几微秒)。本文将报道实验结果。
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