论述了现有波动电压检测方法的原理、特点、适用范围，分析了现有闪变值的计算方法及其不足；
And the thesis expounds detection methods of current voltage fluctuation in the principle, characteristic, application scope, and analyzes present calculation technology and deficiency;
该设计可以根据电网电压的波动调整动作值，从而保证电缆绝缘电阻的动作值不变；
The operating value of earth leakage protection can be changed with the mains voltage, but the operating value of cables insulation resistance is held the line.
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；
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.
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