Abstract
The aging performance of zinc oxide (ZnO) varistors doped with aluminum and indium was investigated. Alternating current (AC) accelerated aging voltages of 0.85U1mA, 0.90U1mA and 0.95U1mA were applied to the doped varistors at a temperature of 115 °C for more than 1000 h. The electrical properties of the varistors before and after the aging process were evaluated by measuring their current–voltage, capacitance–voltage, and dielectric characteristics. The results showed that the ZnO varistor samples exhibited stable electrical properties under the applied aging conditions. Degradation rate coefficients (Kt) of 0.03, 0.05 and 0.06 were obtained at AC accelerated aging voltages of 0.85U1mA, 0.90U1mA and 0.95U1mA, respectively. The results indicated that the varistor ceramics should be able to operate safely and continuously under the given conditions for more than 110 years, which meets the requirements of surge arresters in power systems. These findings are important for improving the aging performance of ZnO varistors and the general security and stability of power systems.
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