绝缘子覆冰及其电气试验方法探讨

绝缘子覆冰及其电气特性试验方法是严重覆冰地区外绝缘设计的重要基础,但至今尚无该试验方法的标准。在总结国内外现有试验方法的基础上,参照IEC507和IEEEStd4等高压试验标准,提出了表征绝缘子覆冰的特征参数,探讨和分析了绝缘子覆冰及其电气性能的试验方法、试验程序以及对其试验电源的要求。结果表明,绝缘子覆冰分为人工覆冰和自然覆冰,人工覆冰常用不带电和带电覆冰,电气特性的主要试验方法有耐受法、平均闪络电压法和U形曲线法等,其中U形曲线法用于融冰期,耐受法、平均闪络电压法既可用于融冰期也可用于覆冰期,覆冰绝缘子的试验电源满足污秽绝缘子试验电源要求即可。

Insulators Icing and Electrical Tests Methods

Insulators icing and electrical tests methods, which is not proposed at any standards by now ,are important for the external insulation design of HV transmission lines in severe icing districts. Based on the used methods by researchers and referenced on IEC507 and IEEE Std 4, This paper indicates the characteristic parameters specialized insulators icing. It proposes that the insulators icing can be divided into natural icing and artificial icing which includes energized icing and non-energized icing, that the electrical tests methods can be described as a withstand method, an average flashover voltage method and a U-type method, the former two can be used in icing or ice-melting, but the last can only be used in the ice-melting period, and that the test power supply used for iced insulator is according with the polluted insulator.