Abstract
The resistive leakage current in surge protectors is an important indicator to characterise its aging degree. It is of great significance to accurately extract the resistive components from the total leakage current for online monitoring of the surge protectors. An improved phase-shift current method is proposed to extract the weak resistive components. The fundamental frequency and phase-shift angle of the total leakage current are determined by the measures of zero-crossing detection, low-pass filtering, and phase measurement on the leakage current. The resistive components extracted from simulation and experimental data by this improved method are analysed with FFT. The results show that the improved method can significantly improve the extraction accuracy of the fundamental and harmonic resistive components.
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