On-line Measurement on Leakage Current of MOA

Measurement on leakage current of MOA was made using on-line monitoring and periodic live-line testing method. Factors effecting measurement results are as follows: voltage wave harmonics across MOA, voltage variation across MOA, external surface pollution, temperature and humidity variation of surrounding air, and interaction of 3 phases MOA is service. It is recommended to use normal method, traverse and longitudinal comparison methods and synthetic analysis for evaluating MOA status.