基于上下表面电弧特性的交流绝缘子污秽闪络电压计算  

Modeling of AC Arc Discharge on Insulators in Consideration of Arc Characteristic Differences Between Partial Arcs on Top and Bottom Wet-polluted Dielectric Surfaces

作　　者：李亚伟[1] 杨昊[1] 张乔根[1] 周军[2] 于昕哲[2] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2014年第30期5442-5450,共9页Proceedings of the CSEE

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

摘　　要：根据上下湿污表面交流局部电弧特性的差异,建立了交流污闪电压双电弧计算模型。为获得模型参数,测量了三角形玻璃板上下表面的局部电弧,分别获得了上下表面局部电弧的静态伏安特性和重燃条件;利用高速摄像机对局部电弧进行观察,得到了上下表面弧道半径与泄漏电流峰值之间的关系;同时,研究了∏型玻璃板装置闪络过程中局部电弧延伸过程,发现上下表面局部电弧弧长均随泄漏电流峰值线性增加,弧长增量之比与表面盐密有关,由此获得了上下表面弧长之比与表面盐密的关系式。结果表明:该双电弧模型可以较为准确地计算交流绝缘子的污闪电压。Considering the differences in the characteristics of arcs on top and bottom wet polluted surfaces, an AC mathematical model was proposed to predict the flashover voltage of insulators. In order to obtain the parameters of the model, arcs on top and bottom surfaces of triangular glass plate were measured, and the static U-I characteristics and recovery criteria were also acquired. In addition, an ultra-high speed camera was used to observe the AC partial arc characteristics on top and bottom surfaces the partial arcs. It is found that the U-I characteristics and recovery criteria of top and bottom arcs are different, and the radius and length of the arc column increase exponentially with the leakage current peak. It can be concluded that the ratio between arc length increments on top and bottom surfaces is related to equivalent salt deposit density（ESDD）. The flashover voltages obtained by mathematic model commendably coincide with those obtained experimentally.

关 键 词：交流局部电弧 上下湿污表面 电弧特性 污闪电压计算 

分 类 号：TM85[电气工程—高电压与绝缘技术]