复合绝缘子表面不同状态时的放电特征  

Discharge Features of Composite Insulator in Different Surface States

作　　者：张乔根[1] 周建博[1] 奚海波[1] 于昕哲[1,2] 周军[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]中国电力科学研究院,北京100192

出　　处：《高电压技术》2014年第4期987-994,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209406)~~

摘　　要：复合绝缘子不同表面状态会出现不同放电现象,为此根据复合绝缘子表面放电的剧烈程度将复合绝缘子表面放电分为微弱性放电、间隙性电弧放电、持续性电弧放电3种类型。经过大量试验,统计分析了不同放电类型下泄漏电流的谐波特征和相角特征,建立了放电类型与泄漏电流谐波和相角的关系,并研究了复合绝缘子不同污秽和憎水性对表面放电类型的影响。结果表明:通过分析泄漏电流的谐波特性和相角特性,可以得出绝缘子不同表面状态所对应的放电类型及其特征。复合绝缘子表面憎水性变差时,微弱放电比例略有减少,部分间隙性电弧放电转变成持续电弧放电,持续电弧放电比例增加;复合绝缘子表面污秽度变高时,部分微弱性放电转变成间隙性电弧放电及持续性电弧放电,间隙性电弧放电及持续电弧放电比例增大。通过对泄漏电流的特性分析,可以判断出复合绝缘子表面的状态。Different discharge phenomena show on insulator surfaces of different states, so here according to their surface discharge intensity, we divide these surface discharges into three types, namely weak discharge, interstitial arc discharge and continuous arc discharge. After conducting a number of tests, we statistically summarized and analyzed the harmonic features and the phase angle features of leakage current in different discharge types, revealed the relation between them, and investigated the effect of different pollution and hydrophobicity of composite insulator on surface discharge type. The results indicate that the types and features of discharges on insulator surfaces of different states can be obtained through analyzing the harmonic features and the phase angle features of leakage current. When the surface hydrophobicity of a composite insulator gets worse, the weak discharge reduces slightly in proportion, the interstitial arc discharge partly transforms into continuous arc discharge, and the continuous arc discharge increases in proportion. When the surface pol- lution of a composite insulator gets heavier, the weak discharge partly transforms into interstitial arc discharge and continuous arc discharge, and both the interstitial arc discharge and the continuous arc discharge increase in proportion. In another word, the characteristics of leakage current also reflect the surface states of composite insulators.

关 键 词：复合绝缘子 表面状态 放电类型 泄漏电流 污秽度 憎水性 

分 类 号：TM216[一般工业技术—材料科学与工程]