超、特高压直流线路瓷和玻璃绝缘子污闪特性研究  

Pollution Flashover Performances Porcelain and Glass Insulators Intended for EHV/UHV DC Transmission Line

作　　者：黄欢[1] 蒋兴良[1] 罗利云[2] 苑吉河[1] 孙利朋[1] 

机构地区：[1]重庆大学输配电装配及系统安全与新技术国家重点实验室,重庆400044 [2]江西省电力公司超高压分公司,江西南昌330006

出　　处：《高压电器》2008年第5期424-427,共4页High Voltage Apparatus

基　　金：国家自然科学基金项目(90210026);“十一五”国家科技支撑计划重大项目(2006BAA02A19)。

摘　　要：根据直流人工污秽试验，笔者分析和比较了6种型式瓷和玻璃绝缘子污闪特性。试验结果表明：不同型式绝缘子的污秽闪络性能不同，盐密影响特征指数a与绝缘子的结构和材质有关，其值在0.32～0．55间。同样污秽下，玻璃绝缘子的污闪电压梯度高于相同结构的瓷绝缘子，外伞型绝缘子的污闪电压梯度低于钟罩型绝缘子。绝缘子的有效爬电系数与其型式和污秽程度有关，可表示为K=M×（SDD）^m。在试验的五种非标准绝缘子中，玻璃钟罩型绝缘子较好的利用了其爬电距离，而双伞型瓷绝缘子的有效爬电系数最低。Based on the DC artificial pollution tests, the flashover performances of six types of porcelain and glass insulators was analyzed and compared. The test results show that the insulators with different configuration and materials have different pollution flashover characteristics, the exponent a characterizing the influence of salt deposit density on flashover voltage depends on the configurations and materials, which varies within 0.32 and 0.55. Under the same pollution degree, the flashover voltage gradients of glass insulators are higher than those of porcelain insulators with the same configuration, while the flashover voltage gradients of outer-rib insulators are lower than those of anti-fog insulators. The effectiveness of creepage distance relates with insulator types and pollution degree, which can be denoted by K=M×（SDD）^m. For the tested five types of non-standard insulators, the anti-fog glass insulators make good use of their creepage distance, while the two-outer-rib porcelain insulators have the lowest effectiveness of creepage distance.

关 键 词：直流绝缘子 污秽 闪络特性 闪络电压梯度 有效爬电系数 

分 类 号：TM85[电气工程—高电压与绝缘技术]