高海拔环境对RTV涂层污耐压的影响

Effect of High Altitude Environment on the Withstand Voltage of the Polluted RTV Coating

高海拔对输电线路绝缘子涂层污耐压有不同程度的影响,针对此类现象,模拟0 m、1000 m、2000m、3000 m、4000 m海拔高度绝缘子中度污秽和重度污秽工况下耐压试验。通过未涂覆RTV涂层绝缘子与涂覆RTV涂层绝缘子对照试验,表明在高电压作用下未涂覆RTV涂层绝缘子与涂覆RTV涂层绝缘子闪络发生部位不同。当中度污秽时,随海拔升高,RTV涂层对于绝缘子污闪电压提高倍数影响不大;当重污秽时,随海拔高度提升,污闪电压倍数有所降低。

The altitude has some effect on the withstand voltage of polluted coating of the power transmission line insulator.The simulated withstand voltage tests are made on the insulator with middle and heavy pollution in 0,1000,2000,3000 and 4000 meter altitude.The comparison between test with and without RTV coating shows that the flashover location of the insulator with RTV coating is different with the location without RTV coating under high voltage,the RTV coating has a little effect on the withstand voltage increasing multiple with increasing altitude under middle pollution and the withstand voltage increasing multiple reduces with increasing altitude under heavy pollution.