摘要
为研究直流电压下大吨位绝缘子双串并联覆冰闪络特性,针对CA-785EX绝缘子进行不同串间距下的电场仿真分析,并开展不同污秽度下单I串和双串并联人工覆冰闪络试验。通过分析高速摄影仪拍摄的电弧发展过程,揭示覆冰条件下串间距对双串并联绝缘子冰闪过程、冰闪电压及泄漏电流的影响。结果表明,双串并联时电场会发生不同程度畸变,冰闪过程中电弧发展和泄漏电流呈一定规律性;不同污秽条件下,串间距的影响程度不同;当串间距≥600mm时,串间距对双串并联绝缘子冰闪电压的影响不显著。研究成果为绝缘子选型配置提供了理论支撑。
To research the DC flashover performance of parallel double insulators（II strings）under icing conditions,electric field simulations with different distances between adjacent strings,and icing tests under different pollution degrees were performed on the samples of CA-785 EX insulators.According to video recording of the flashover process,how the distance between adjacent strings influenced the process of ice flashover,flashover voltage and leakage current was studied.Test results show that the electric field of II strings is deformed to a certain extent,arc developing and leakage current have some regular pattern in the process of ice flashover.The distance has different impact on II strings under different pollution degree.When the distance between strings increases to 600 mm,the influence of the distance can be neglectful.The research can provide theoretical support for the arrangement of insulators.
出处
《水电能源科学》
北大核心
2016年第4期181-185,共5页
Water Resources and Power
基金
国家电网公司重大科技项目(GY71-13-034)
关键词
直流
双串并联
覆冰闪络
串间距
电场分布
电弧发展
泄漏电流
DC
parallel double-strings
ice flashover
distance between strings
electric field distribution
arc developing
leakage current
