Affiliation:
1. State Grid Sichuan Electric Power Research Institute Chengdu China
2. College of Electrical Engineering, Sichuan University Chengdu China
Abstract
AbstractAs the core component of lightning arrester, the performance of ZnO varistor directly affects the protection level of lightning arrester. Under the action of long‐term AC voltage, the varistors are prone to AC aging, which leads to the deterioration of its performance parameters and microstructure, resulting in the failure of the varistors. In this paper, the effects of doping on the voltammetry and double Schottky barrier characteristics of ZnO varistors under AC were studied by means of , scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy characteristic testing. The AC accelerated aging test was carried out for 168 h under 135 and 0.85 ratio of peak voltage. The results showed that the introduction of inhibited the migration of interstitial zinc ions to grain boundaries and decreased the AC aging rate. The aging rate was lowest when 1.5 mol% was doped.