交流GIS用盆式绝缘子三交区绝缘结构设计研究

Insulation structure design of basin insulator in three media interaction areas for AC GIS

以提高盆式绝缘子三交区绝缘能力为出发点,从三交区构成、异物运动特性及典型放电现象分析了三交区结构设计缺陷导致异物聚集并诱发盆式绝缘子沿面闪络的原因。通过电场仿真,研究接地屏蔽电极、盆式绝缘子法兰处厚度及接地屏蔽电极与母线筒体法兰距离对低电位三交区电场强度的影响,给出高电位三交区电场随盆式绝缘子底部倾斜角度、三交区宽度的变化规律,提出接地屏蔽电极高压侧防止树脂贯通破坏厚度的计算方法及三交区电场校核判据。结果表明:合理的高、低电位三交区结构设计可有效抑制异物聚集诱发的盆式绝缘子沿面闪络。

In order to improve the insulation ability of the three media interaction area of basin insulator,the reasons of the accumulation of foreign body,and the flashover along the basin insulator surface induced by the structure design defect of the three media interaction area was analyzed from the composition of three media interaction area,the movement characteristics of foreign body and the typical discharge phenomenon.Through electric field simulation,the influence of grounding shielding electrode,the flange thickness of basin insulator,and the distance between the grounding shielding electrode and the busbar cylinder flange on the electric field intensity in the low potential three interaction area were studied,the variation law of electric field in the high potential three interaction area with tilting angle and three media interaction area width of basin insulator were given.The calculation method of the thickness of the high voltage side of grounding shield electrode to prevent resin through failure and the criterion of electric field check in the three media interaction area were presented.The results show that the reasonable structure design of three media interaction area with high and low potential can effectively inhibit the surface flashover induced by foreign matter accumulation.