浅析MOA泄漏电流测试方法

介绍了直流电压下的泄漏电流测量和工频电压下的全电流测量及阻性电流测量方法中的容性电流补偿法、三次谐波法以及基波法。指出直流法简单易行,可用于MOA安装现场试验,但易受现场条件影响。采用全电流法能发现已发生显著劣化的MOA安全问题,但对于早期老化或受潮反应不灵敏。容性电流补偿法原理简单,但不适于三相同时测量;三次谐波法不适合在谐波分量过大的情况下使用,对MOA的老化程度无法做出定量分析;基波法能排除相间杂散电容影响,其准确性较高,适于三相同时测量。

Analyze of the Methods for MOA's Leakage Current

Measuring leakage current of MOA at DC and total current at AC as well as resistive current component using capacitive current compensation,thrice-frequency harmonic or base wave method were introduced.The DC method is simple and easy before installation,but would be affected by the on-site condition;the problems of MOA's safety could be found by total current test when the MOA was apparently deterioted,but it was unresponsive to the inchoate aging or damping.The method of capacitive current compensation is simple,but could not be used at three-phases synchronous measurement.the thrice-frequency harmonic wave method could not be used when the harmonic component was great,which could not give a quantitative analysis of aging degree.The basic wave method,excluding the effect of phase to phase stray capacitance,has a higher accuracy and can be used at three phases synchronous measurement.