电压谐波对MOA泄漏电流检测方法影响分析

Effect of Voltage Harmonics on Test Method of MOA Leakage Current

电网电压谐波不仅对MOA泄漏电流中的容性分量带来干扰,而且对阻性分量也带来干扰。分析了电压谐波对两种基本方法-补偿法与谐波分析法的影响,并对补偿法进行了仿真计算,补偿法必须考虑容性谐波的干扰,谐波分析法避开了容性谐波的干扰,两种方法都不能消除阻性电流中直接来自电压谐波中的分量,综述目前已有消除电压谐波影响的方法,可根据阻性电流基波分量计算出阻性电流值及谐波分量,阻性电流中来自系统电压谐波干扰部分的消除还需进一步分析。

Power system voltage harmonics not only affect the capacitive component,but also affect the resistive component.And the influence of voltage harmonics on the two basic detecting method-compensation method and harmonic analysis method is analyzed,and the compensation method is simulating calculated,the effect of the capacitive harmonic has to be considered for the compensation method,and this effect can be avoided by the harmonic analysis method,but neither of them can eliminate the component from the voltage harmonics in the resistive current,the known methods of eliminating voltage-harmonic influence are summarized,the values of resistive current and its harmonic content can be calculated based on the measured resistive first-harmonic current,and the elimination of the fundamental harmonic component of resistive current,the elimination of which from system voltage harmonic interference part in resistive current needs further study.