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.

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。

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The RMS converters of voltage and current have the advantages of high speed and precision, and with the feedback of RMS, the fluctuate of power voltage can be compensated at high precision.

电压、电流真有效值变换精度高、速度快，电压真有效值负反馈闭环控制主回路网压波动补偿精度高；

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