由电孤启动到正常工作这段时间，电网线路的电流电压波动性较大，往往给电路其它各元件造成强烈的冲击。
From starting-up to stabilization of the arc, the electric current and voltage usually fluctuate acutely, which makes a great impact on other circuit components.
具有较强的耐电压冲击性，能经受高速，频繁变频时的脉冲电压。
It can withstand the impulse voltage of high speed and frequent converting.
同时，本文还提出了过电压冲击自动报警与计数系统设计的可行性方案。
Furthermore, an automatic alarming and counting system of overvoltage pulse is suggested.
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