表面水滴对特高压直流输电线路电晕特性的影响  

Effect of Water Drop on UHV DC Transmission Corona Performance in Corona Cage

作　　者：范建斌[1] 谷琛[1] 殷禹[1] 周军[1] 王伟(小)[2] 李成榕[2] 姜一涛[2] 安冰[2] 王益旭[2] 杨波[2] 樊飞[2] 

机构地区：[1]中国电力科学研究院,北京100192 [2]华北电力大学高压与电磁兼容北京市重点实验室,北京102206

出　　处：《高电压技术》2009年第10期2340-2343,共4页High Voltage Engineering

基　　金：国家电网公司科技项目(SGSC[2005]81)~~

摘　　要：雨、雾天气情况下导线表面形成的水滴会导致导线周围电场分布发生严重畸变,从而改变导线的电晕特性。我国第1条特高压直流输电工程——云广线处于多雨地区,导线电晕特性需考虑水滴因素的影响。为研究导线表面水滴对特高压输电线路电晕特性的影响程度,划分了导线表面水滴的等级,建立了导线电晕特性测试系统,测量了不同水滴等级下,电晕笼中导线的起晕电压、可听噪声水平等特征量,获得了导线表面水滴对导线电晕特性的影响规律,并据此对我国特高压直流输电线路的工程设计提出了建议。研究结果表明:导线的起晕电压随导线表面水滴等级的提高迅速下降,最低可降到原来的一半左右;起晕后,导线发生剧烈的舞动,导线表面的水滴在电场的作用下会被"蒸发"或甩掉;水滴会使导线起晕时的可听噪声值降低;在相同的电压作用下,导线的可听噪声水平随导线表面水滴等级的增加而提高。Water drop on conductor line surface caused by rain or fog would distort the voltage gradient around the conductor line and change the corona performance of conductor line. The first UHV DC transmission project, Yun- Guang transmission line would be in rain fed areas, corona performance of conductor line should consider the effect of water drop. To research the effect of water drop on corona performance of UHV DC transmission line, water drop level was defined, a conductor corona performance test system was set up, corona onset voltage was defined, and the corona inception voltage and audible noise level of DC conductor were measured in different water drop level in corona cage. Moreover, the effect of water drop on DC conductor corona performance was observed, and a reference for engineering design of UHV DC transmission line was suggested. Test results show that corona onset voltage rapidly decreases as the water drop level increases; Conductor would sloshing acutely and water drop will be ＂vaporized＂ or throw off from conductor after corona onset; Audible noise level of conductor increases as the water drop level increases at the same voltage; however, Audible noise level of conductor decreases with the water drop level increases at its onset voltage.

关 键 词：特高压 直流电晕 表面水滴 电晕笼 起晕电压 可听噪声 

分 类 号：TM851[电气工程—高电压与绝缘技术]