温度对直流GIL绝缘子电荷积聚特性的影响  

Effect of Temperature on Charge Accumulation on Insulator in DC-GIL

作　　者：周宏扬 马国明 赵书静 刘姝嫔 李成榕 屠幼萍 宋宏图 吴震 ZHOU Hongyang MA Guoming ZHAO Shujing LIU Shupin LI Chengrong TU Youping SONG Hongtu WU Zhen(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources （North China Electric Power University）, Changping District, Beijing 102206, China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2016年第24期6675-6681,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2014CB239502)~~

摘　　要：研究直流电压下绝缘子表面电荷积聚问题对于推进直流气体绝缘金属封闭输电线路(gas insulated metal-enclosed transmission line,GIL)的发展至关重要。现有试验研究中均未考虑温度对电荷积聚的影响,难以获得用于实际工程中的直流GIL绝缘子电荷积聚情况。而仿真计算仅从理论上分析了温度对电荷积聚的影响规律,尚缺乏有效的实验验证。为了解决上述问题,该文设计了可模拟直流GIL导杆发热现象的绝缘子表面电位测量试验平台,并设计了同轴圆柱结构试验模型。研制了紧凑型静电位测量系统对不同温度下绝缘子的表面电位进行了测量,掌握了直流GIL导杆温度对绝缘子电荷积聚特性的影响。试验结果表明:当中心电极温度由室温升高至70℃时,在正极性电压作用下,绝缘子平均表面电位由278V增大至1670V(501%);在负极性电压作用下,绝缘子平均表面电位为负,绝对值由460V增大至1507V(228%)。因此,在进行绝缘优化设计时,需要考虑温度的影响,该研究可为直流GIL绝缘优化设计提供参考。The study of surface charge accumulation under DC-voltage is significantly important to the development of DC-GIL. However, the impact of temperature on the charge accumulation was not taken into account in the existing experimental studies, and it is difficult to obtain the charge accumulation of DC-GIL insulator used in practical engineering. Although the impact of temperature on surface charge accumulation of insulator has been studied by simulation, these simulation results were lacking in experimental verification. In order to solve the above problems, this paper designed a test platform for surface potential measurement of insulator which can simulate the heating of DC-GIL center conduct, and designed a coaxial cylindrical structure test model. A compact electrostatic potential measurement system was developed to measure the surface potential of insulator at different temperatures, and the effects of the temperature on the charge accumulation characteristics of insulator were studied. The results show that the average surface potential of the insulator increases from 278V to 1670V （5-01%） when the temperature of the center electrode rises from room temperature to 70℃ under the positive voltage. While the average surface potential was negative with the voltage of negative polarity, and the absolute value was increased from 460V to 1507V （228%）.Therefore, the influence of temperature on surface charge accumulation should be taken into consideration, and the results of this paper can provide references for the design of DC-GIL insulation.

关 键 词：气体绝缘金属封闭输电线路(gas insulated metal-enclosed transmission line GIL) 电荷积聚 温度 试验平台 表面电位测量 

分 类 号：TM85[电气工程—高电压与绝缘技术]