Analysis of DC Aging Characteristics of Stable ZnO Varistors Based on Voronoi Network and Finite Element Simulation Model
ZHANG Ping1,*, LU Mingtai1, LU Tiantian2, YUE Yinghu2
1 School of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 733000, China 2 China Electric Power Research Institute, Beijing 100192, China
Abstract: In modern ZnO varistors, traditional aging mechanisms based on increased power consumption are no longer relevant due to reduced power consumption during DC aging. Prolonged exposure to both AC and DC voltages results in increased leakage current, decreased breakdown voltage, and lower nonlinearity, ultimately compromising their protective performance. To investigate the evolution in electrical properties during DC aging, this work developed a finite element model based on Voronoi networks and conducted accelerated aging tests on commercial varistors. Throughout the aging process, current-voltage characteristics and Schottky barrier parameters were measured and analyzed. The results indicate that when subjected to constant voltage, current flows through regions with larger grain sizes, forming discharge channels. As aging progresses, the current focus increases on these channels, leading to a decline in the varistor’s overall performance. Furthermore, analysis of the Schottky barrier parameters shows that the changes in electrical performance during aging are non-monotonic. These findings offer theoretical support for understanding the aging mechanisms and condition assessment of modern stable ZnO varistors.
通讯作者:
*Ping Zhang, an associate professor and master’s supervisor at the School of Electrical Engineering and Information Engineering,Lanzhou University of Technology.She obtained her Ph.D.in Control Theory and Control Engineering from Lanzhou University of Technology in 2012,earning a Doctor of Engineering degree.Her research focuses on modeling and control of renewable energy power systems and finite element simulation modeling of electrical equipment.415621328@qq.com
引用本文:
张萍, 路明泰, 卢甜甜, 岳英虎. 基于Voronoi网络和有限元仿真模型的稳定型ZnO压敏电阻直流老化特性分析[J]. 材料导报, 2026, 40(2): 24090232-9.
ZHANG Ping, LU Mingtai, LU Tiantian, YUE Yinghu. Analysis of DC Aging Characteristics of Stable ZnO Varistors Based on Voronoi Network and Finite Element Simulation Model. Materials Reports, 2026, 40(2): 24090232-9.
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2026, Vol. 40 
