绝缘支柱微小放电熄灭电位的接触角依存性  

Angle of contact dependence of micro-discharge extinction potential at triple junction

作　　者：葛自良[1] 马宁生[1] 藤林宏一 松井满 

机构地区：[1]同济大学物理系,上海200092 [2]东京农工大学电子情报工学科

出　　处：《电工电能新技术》2002年第3期9-12,共4页Advanced Technology of Electrical Engineering and Energy

摘　　要：绝缘支持的高电压导体近旁电场 ,即使其平均场强低于空气绝缘破坏场强 ,也会因三重点效应 ,在接触点发生微小放电。以具有圆锥状聚丙烯支柱的同心球空气电容器为研究模型 ,在金属内球上瞬时施加 30kV高电压后 ,对具有不同接触角的绝缘支柱表面发生的微小放电 ,分别进行其熄灭电位的测定 ,得出微小放电熄灭电位与接触角间的实验关系式。即随着接触角角度的减小 ,微小放电熄灭电位沿倒置的悬链线下降。这样改变绝缘支柱与带电导体间的接触角 ,可有效地对微小放电熄灭电位进行调节 ,从而控制绝缘支柱表面微小放电的发生。At an electric field near a high-voltage conductor with a solid insulator, whose average value of intensity is less than the dielectric breakdown strength of the air, micro-discharge can start from contact points owing to triple junction effect. A concentric spherical air condenser with a conical synthetic resin insulator was chosen as the subject of the study. After the inner metal sphere was charged instantaneously by 30kV high-voltage, micro-discharge extinction potential values of the inner sphere supported by the insulator with different angle of contact have been measured, and experimental dependence of micro-discharge extinction potential on angle of contact has been obtained. It shows that micro-discharge extinction potential drops along inverted catenary with the reduction in angle of contact. Thus changing angle of contact can regulate micro-discharge extinction potential, so it can be used to control the start of micro-discharge at triple junction.

关 键 词：绝缘支柱 微小放电 放电熄灭电位 接触角依存性 绝缘材料 三重点效应 

分 类 号：TM21[一般工业技术—材料科学与工程]