多串并联绝缘子交直流污闪特性

发布时间：2019-04-04 20:12

【摘要】：特高压等级线路中为满足机械特性的需要而应用到多串并联形式的绝缘子串。为此,分别在交流和直流电压下通过人工污秽试验研究了多串并联绝缘子的污闪特性,试验中分别采用了2联、3联、4联以及6联的结构。试验结果表明,多串并联绝缘子的污闪电压比单串低,其原因除了绝缘子并联串数的增加导致其污闪概率的升高外,还受到并联串间放电产生的电离空气的影响。并联数4时,多串并联绝缘子的污闪电压比单串降低约4%;并联数≥4时,污闪电压降低超过10%。建议在实际工程中使用多串并联的形式时,将瓷绝缘子的片数在原基础上增加8%,复合绝缘子的串长增加5%。研究结论可为特高压输电线路外绝缘的设计与建设提供参考。
[Abstract]:In order to meet the needs of mechanical characteristics, ultra-high voltage grade lines are applied to multiple series-parallel insulator strings. In this paper, the pollution flashover characteristics of multiple series and parallel insulators are studied by artificial pollution test under AC and DC voltages respectively. The structures of 2, 3, 4 and 6 pairs are used in the experiment. The experimental results show that the pollution flashover voltage of multiple series-parallel insulators is lower than that of single series. Besides the increase of the number of parallel series of insulators, the probability of pollution flashover is increased, and the ionization air produced by parallel series discharge is also affected. When the number of parallel connections is 4, the pollution flashover voltage of multiple series and parallel insulators is reduced by about 4% compared with that of single series, and when the parallel number is 鈮，

本文编号：2454128