污秽条件下±800kV直流输电线路电晕特性  

Corona Characteristics of ±800 kV UHV DC Polluted Transmission Lines

作　　者：张乔根[1] 王清亮[1] 张璐[1] 李舟 谭筱雅[1] 范建斌[2] 谷琛[2] 

机构地区：[1]西安交通大学高电压技术教研室,西安710049 [2]中国电力科学研究院,北京100192

出　　处：《高电压技术》2010年第1期31-36,共6页High Voltage Engineering

基　　金：国家电网公司科技项目(SGSC[2005]81)~~

摘　　要：±800 kV特高压直流输电线路起晕特性是影响其线路结构和建设费用的重要因素。起晕特性与导线表面状态相关,而直流电压下导线表面更容易积污,更严重影响输电线路的电晕特性。为了深入研究特高压直流输电线路污秽电晕问题,利用电晕笼研究了导线表面分别附有不同表面密度的模拟污秽和碳粉时的起晕特性并分析了污秽对±800 kV特高压直流输电线路电晕特性的影响。结果表明:当导线表面分别附有模拟污秽和碳粉时,在实际特高压直流输电线路表面场强附近,随污秽度的增加,电晕电流的增加趋势不同。起晕电压随污秽度的增加呈负指数下降,有饱和趋势,其中碳粉污秽对负极性电晕起始电压影响最大。根据实验结论和仿真研究,初步得出了±800 kV特高压直流输电线路导线电晕起始电压与表面污秽度之间的函数关系。We investigated the corona inception voltage and corona current characteristics of conductor when the surface of conductor was adhered with artificial contaminations of different densities and carbon powder respectively by use of an corona cage, and predicted corona inception voltage characteristics of ±800 kV UHV DC polluted transmission lines primarily based on experimental and the results of simulation. The results show that at the level of actual surface voltage gradient of UHV DC transmission lines, corona current increases differently with the increase of contamination densities when the surface of conductor is adhered with artificial contaminations and carbon powder respectively. Corona inception voltage decreases follow the negative exponential function as the contamination densities increase in company with saturated tendency, and negative corona inception voltage is influenced most by carbon powder. Based on experimental results and the results of simulation, a function relationship is educed between corona inception voltage and surface contamination densities of ±800 kV UHV DC transmission lines primarily.

关 键 词：±800kV 特高压直流 输电导线 电晕笼 污秽 污秽密度 起晕电压 

分 类 号：TM851[电气工程—高电压与绝缘技术]