Research on formula of ZnO varistor with optimized impulse aging performance

ZnO varistors' electrical properties directly determine the protective effect of the metal oxide arrester (MOA). For some MOAs with extremely high energy absorption requirements, damaged cases occurred due to the aging of the varistor. It is necessary to carry out research on formula optimization of
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varistors to optimize the aging performance of the varistors, and try to avoid electrical performance deterioration and even collapse of the varistors under multiple impulses. Based on the basic formula of the ZnO varistor, by adjusting the doping amount of various elements, grain parameters and electrical properties of varistor pieces with different additives doping were compared. Furthermore, this paper carried out an impulse aging test on the varistor, so as to obtain the influence rule of the impulse aging performance. Based on the comparative analysis of various elements doping, the influence rule of various additives on the varistors was concluded. And the optimized doping formula can be used to prepare ZnO varistors with improved aging performance.