1、高电压绝缘技术高电压绝缘技术第三章：气体间隙击穿电压第三章：气体间隙击穿电压及提高方法及提高方法HV&EMC Laboratory North China Electric Power University 引言：击穿电压的影响因素引言：击穿电压的影响因素HV&EMC Laboratory North China Electric Power University一、持续作用电压下空气的击穿电压一、持续作用电压下空气的击穿电压)(08.622.24峰值峰值kVddUb HV&EMC Laboratory North China Electric Power University一、持续作用电压
2、下空气的击穿电压一、持续作用电压下空气的击穿电压 极性效应不明显；极性效应不明显；直流、交流、冲击电压直流、交流、冲击电压下击穿电压相同；下击穿电压相同；击穿电压和电场不均匀击穿电压和电场不均匀程度有极大关系，程度有极大关系，越均越均匀击穿电压越高匀击穿电压越高。HV&EMC Laboratory North China Electric Power University球球-球间隙和球间隙和球球-板间隙板间隙当不均匀程度增加时，不接地电极电场强；当不均匀程度增加时，不接地电极电场强；由于电晕起始由于电晕起始电压电压=击穿电压，不接地电极为正时击穿电压高。击穿电压，不接地电极为正时击穿电压高。
3、HV&EMC Laboratory North China Electric Power University一、持续作用电压下空气的击穿电压一、持续作用电压下空气的击穿电压 电极影响不大，都接近于棒电极影响不大，都接近于棒-板间隙；板间隙；极性效应明显；极性效应明显；分散性很大，分散性很大，不同电压波形下差异明显不同电压波形下差异明显。HV&EMC Laboratory North China Electric Power University正棒负板正棒负板 棒棒-棒棒 负棒正板。负棒正板。HV&EMC Laboratory North China Electric Power Unive
4、rsityHV&EMC Laboratory North China Electric Power University长间隙中棒长间隙中棒-板间隙的板间隙的“饱和饱和”现象尤为明现象尤为明显显HV&EMC Laboratory North China Electric Power UniversityHV&EMC Laboratory North China Electric Power University%20s50Tt%30s2.1Tf HV&EMC Laboratory North China Electric Power University国标规定：国标规定：%60s2500T%
5、20s250Ttf HV&EMC Laboratory North China Electric Power UniversityfSLttt st0Uft0U0tLtstftLtLtHV&EMC Laboratory North China Electric Power University HV&EMC Laboratory North China Electric Power UniversityHV&EMC Laboratory North China Electric Power UniversityHV&EMC Laboratory North China Electric Pow
6、er UniversityMVdU814.3%50HV&EMC Laboratory North China Electric Power University%50U 相对标准偏差：相对标准偏差：%50%84UU%16%50UU%50%50%50U)%84(U)%43(U%1%88.991)31(%50PU耐受电压U16%U50%U84%P(%)U U击击1008450160不击穿不击穿击穿击穿气隙击穿电压的正态分布气隙击穿电压的正态分布HV&EMC Laboratory North China Electric Power University0ndUKKU dKnKHV&EMC Labo
7、ratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施 HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University
8、五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施HV&EMC Laboratory North China Electric Power University五、提高气体间隙击穿电压的措施五、提高气体间隙击穿电压的措施
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