A simple thermal computation procedure of a metal oxide varistor (MOV) element, in which an impulse current is injected, is presented. The heat in the MOV, composed of many small cells, is computed with the discretized heat transport equation. At each time step, the injected impulse current is assumed to be distributed uniformly in the MOV. The power per cell is computed from the instantaneous values of injected conduction current density and resultant electric field, the latter of which is obtained with an approximate expression of the nonlinear relation between conduction current density and electric field. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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雷电冲击电流下金属氧化物压敏电阻元件的简化热计算

提出了一种简单的金属氧化物压敏电阻（MOV）元件的热计算程序，其中注入了脉冲电流。MOV中由许多小单元组成的热量是通过离散的热传输方程计算的。在每个时间步长处，假定注入的脉冲电流在MOV中均匀分布。从注入的传导电流密度和所产生的电场的瞬时值计算每个电池的功率，后者通过传导电流密度与电场之间的非线性关系的近似表达式获得。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。