Leakage Currents Flowing through ZnO Elements under Combined Alternating and Direct Voltages

초록

This paper describes the characteristics of leakage currents flowing through zinc oxide (ZnO) surge arrester elements under the combined DC and AC voltages. The I-V curves of ZnO surge arrester elements were measured as a function of the voltage ratio . The I-V curves under the combined DC and AC voltages lay between the pure DC and AC characteristics, and the cross-over phenomenon in both the I-V curves and R-V curves was observed at the low current region. The capacitance is independent of the magnitude of the applied voltage, but it does increase with the voltage ratio.