一起220kV瓷绝缘子钢帽炸裂故障分析

Analysis on the Cracking Failure of a Steel Cap of 220kV Porcelain Insulator

针对一起220 kV耐张串瓷绝缘子钢帽炸裂后故障串及并行非故障串瓷绝缘子进行了外观检查、PRTV憎水性检测、绝缘电阻测试、工频交流耐压试验、机械破坏负荷试验,试验结果及现场故障情况分析认为此次故障为瓷绝缘子串中低、零值绝缘子片数过多造成的整串绝缘子击穿故障。

In this paper,the appearance inspection,PRTV hydrophobicity test,insulation resistance test,power frequency voltage test and mechanical failure load test are carried out for the cracking failure of the steel cap of 220 kV resistant string porcelain insulators.The fault is considered to be a low and zero insulator in the porcelain insulator string with the result of the test and the analysis of the fault situation in the field.The breakdown of insulator string caused by excessive number of chips.