多种冲击电流下金属氧化物压敏电阻动态模型准确性分析

Accuracy Analysis of Dynamic Model of Metal⁃oxide Varistor Under Different Impulse Currents

为研究IEEE模型和Pinceti模型对金属氧化物压敏电阻(metal-oxide varistor,MOV)的仿真准确性,以额定电压为150~750 V的6种MOV为对象,理论和试验分析了不同幅值4/10μs、8/20μs雷电冲击电流和30/60μs操作冲击电流下的残压及吸收能量。结果表明,在IEEE模型参数确定中,随操作冲击电流幅值的增大,非线性电阻参考电压取值增大但电感取值减小;在残压预测中,IEEE模型误差为2.6%,较Pinceti模型误差4.6%更准确;在MOV吸收能量估算中,IEEE模型在低于10 kA电流幅值下的准确性高于Pinceti模型,且IEEE模型对30/60μs操作冲击电流的准确性较高,对8/20μs雷电冲击电流准确性较低。

For studying the simulation accuracy of the IEEE model and Pinceti model for metal⁃oxide varistor(MOV),six types of MOVs at rated voltage of 150⁃750 V are taken as the object to theoretically and experimentally analyze the residual voltage absorption energy at amplitude of lightning impulse current of 4/10μs and 8/20μs and the switching current of 30/60μs.The results show that in the parameter determination of IEEE model,the reference voltage of the nonlinear resistance increases but the inductance decreases with the increase of switching impulse cur⁃rent amplitude;In the residual voltage prediction,the error of IEEE model is 2.6%,which is more accurate than 4.6%of the Pinceti model;In the estimation of the energy absorption of MOV,the accuracy of IEEE model is higher than that of the Pinceti model when the current amplitude is less than 10 kA,and the accuracy of IEEE model to the switching impulse current of 30/60μs is higher,but to the lightning impulse current of 8/20μs is lower.