直流预电压对绝缘子外绝缘特性影响的研究  

Research on the External Insulation of Insulators under Combined Switching Impuls and Direct Voltage

作　　者：王黎明[1] 刘虹[1] 梁曦东[1] 关志成[1] Allen N L 

机构地区：[1]清华大学,北京100084

出　　处：《高电压技术》2000年第4期11-12,15,共3页High Voltage Engineering

摘　　要：在直流预电压作用下 ,采用叠加操作电压对合成绝缘子、瓷绝缘子、支柱绝缘子外绝缘特性的变化进行了比较 ,发现由直流电晕引起的表面电荷影响绝缘子表面电场分布 ,从而影响其绝缘性能。在正极性操作电压作用下 ,正流注预电晕可降低外绝缘性能 。The paper studies the difference of the external insulation behavior among composite insulator, porcelain insulator and post porcelain insulator under composite voltages (switching impulse/DC voltages). The test results show when the DC voltage increases the positive streamer corona prior to the positive impulse voltage encourages the impulse corona activities and makes the U 50% composite sparkover voltage significant decrease for all tested insulators, and the largest decrease occurs in the composite insulator among three kinds of insulators. The negative streamer caused by negative DC pre stressing voltage just has opposite influence.

关 键 词：绝缘子 外绝缘特性 直流预电压 试验 

分 类 号：TM216[一般工业技术—材料科学与工程]