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高压电器  2015 

基于不均匀系数的气体冲击击穿电压计算方法研究

, PP. 36-39

Keywords: 不均匀系数,50%冲击电压,冲击击穿特性,数值计算

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Abstract:

针对高压电气设备气体绝缘,间隙的伏秒特性虽能全面反映冲击击穿特性,但求取繁琐,工程实际中常用50%冲击电压UBD,50%来表示间隙的冲击击穿特性。文中利用电场不均匀系数ζ本身的特性,提出一种基于ζ的气体冲击击穿电压值UBD,50%计算方法,并以0.4MPa干燥空气和0.5MPa氮气为例,结合数值仿真和有限次试验值,得到电场不均匀系数ζ与Emax,50%的函数关系,从而可以得到不均匀系数ζ不同时对应的UBD,50%,并对其计算结果进行了误差分析,误差在7%以内,从而验证了计算方法的有效性。

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