交流电场对复合绝缘子覆雾凇过程影响研究

Study on influence of AC electrical field on process of composite insulators covered-with rime

绝缘子覆冰严重威胁输电线路的安全运行,而电场对输电线路绝缘子覆冰的影响不可忽视。以复合绝缘子FXBW-35/100为试品,在人工气候室内模拟自然覆冰条件,分析研究电场对复合绝缘子覆雾凇过程的影响。结果表明:电场对绝缘子覆雾凇的影响主要体现为对水滴的吸引作用和泄漏电流以及绝缘子表面各类放电现象的作用。电吸力的作用使得覆冰量与覆冰密度增加,泄漏电流以及绝缘子表面各类放电现象使得覆冰量与覆冰密度减小。随着外加电压的升高,绝缘子伞裙边缘、伞裙下表面以及芯棒背风面的雾凇明显增多,迎风面的雾凇全部出现下垂现象;带电覆雾凇时,雾凇密度较不带电时大;覆冰15 min时,冰重随电压的增长有一个先增加后减小的过程。

Icing on the insulators is one of the severe problems for external insulation of transmission lines and the influence of AC electrical field on the icing process of the transmission line insulators can＇t be neglected.As a result,experiment investigations are carried out on the FXBW-35/100 composite insulators in the artificial climate chamber of Chongqing University.The Influence of AC electrical field on process of composite insulators covered-with rime is studied.Based on the test results,it can be concluded that the influence of AC electrical appears mainly as the absorption,the leakage current and the discharge on the insulator.The absorption is the reason of the weight and density of the ice increasing.And the leakage current and the discharge on the insulator will reduce the weight and density of the ice.The amount of rime is great at the edge of the sheds,the upwind of the bottom-surface and the lee face of the core rod as the voltage rise.The rimes on energized at the upwind will droop.The weight of the ice will increase at first and then reduce with the increase of the voltage.