MOA泄漏电流测量的若干问题

Under the sine voltage, the resistance current of MOA leakage current is a non-sine steady-state, so MOA leakage current is a non-sine steady-state. The sine steady-state analysis tools - Phasor method used in the study of MOA leakage current measurement will have to pay attention to the applicability problem. Through analysis of the basic principle of measuring resistive current of LCD - 4 MOA leakage current measuring instrument, this article gives the basic principle for the typical compensation method of measurement resistive current. That is, based on the power frequency sinusoidal component of MOA leakage current ahead of MOA voltage 90 degrees. Through the analysis of three-phase power frequency electric field, the article finally gives the power frequency sine component of MOA leakage current is not just ahead of MOA voltage 90 degrees, under the three-phase operating voltage in the most substation.