Analysis of Interference Current for High-Voltage Arresters Based on Resistance–Capacitance Network

The iterative algorithm based on resistance-capacitance (RC ) network model is put forward to eliminate the interphase interference in measuring the total leakage current of high-voltage zinc oxide arresters; this method can calculate the total leakage current and phase angle difference (the angle between voltage and current) of arresters precisely. The finite-element method is applied to calculate the stray capacitances of arresters by establishing 3-D arresters models. The total leakage current, resistive leakage current, and phase angle difference of arresters can be obtained through the calculation. The actual leakage currents and phase angle differences of 220 and 500 kV arresters in the substation were measured and compared with the calculation results. The comparison results demonstrated the effectiveness and correctness of the proposed method. The interference currents can be obtained by analyzing the one-phase and three-phase results. Then, using the iterative algorithm, the interphase interference of arresters can be eliminated effectively. Compared with some other measurement methods, this method is advantageous for its simplicity and generality.