均压环对改善复合绝缘子的电场分布影响

新疆电网复合绝缘子每年都有污闪事故出现,其中主要原因是部分地区污染太重或气候太恶劣造成绝缘子表面在一定条件下达到了闪络电压,而绝缘子电压分布不均是闪络的直接原因。在这样的情况下,通过一定的实验数据说明了均压环的屏蔽深度、均压环的外径等参数对改善电场分布都有重要影响。提出在这些重污闪地区采用增加均压环来降低绝缘子对塔杆和对导线的电容,进而达到改善电场分布的目的。

Effect of Grading Rings for Improving the Electric Field Distribution of Composite Insulators

Flashover of composite insulators occurs every year in xinjiang grid.The main reason is that the pollution or the weather is too bad in some place,voltage is easy to get to the flashover level,however,the voltage non-uniform distribution is the direct cause of flashover.In this case,by means of some experimental data shows that the parameters such as shielding depth and outside diameter of grading ring are all have significant impact on improve the electric field distribution.It is proposed that reduce the capacitance of insulator to tower and conductor by increasing grading ring in these high pol-lution flashover area,thereby to achieve the purpose of improving the electric field distribution.