盐雾条件下加压方法对绝缘子污秽闪络电压的影响

Effect of Different Voltage Pressure Methods on Salt Spray Flashover Test of Glass Insulator

盐雾污秽闪络试验模拟污秽绝缘子在盐雾环境下的闪络,绝缘子周围空间存在大量高导电率雾滴,与蒸汽雾环境有所不同。盐雾环境下,不同加压方式对闪络试验结果的影响与蒸汽雾环境存在一定差别。因此,文中分别采用均匀升压法和恒压升降法对污秽绝缘子在盐雾环境下的污秽闪络进行模拟,得到绝缘子在2种加压方式下变盐密条件下的闪络电压,并比较曲线拟合结果。结果表明:交流人工盐雾污秽闪络试验中,通过均匀升压法得到的闪络电压高于恒压升降法,2种升压方法的闪络电压差值百分比为14%~36%。

The flashover test of salt fog simulate the flashover of polluted insulators in salt fog environment. There are a lot of high conductivity fog droplets near the insulator,the environment is different from the steam fog environment. Under the salt fog environment,the influence of different pressurization methods on flash-over test results is different from that of steam fog. Therefore,this paper adopts rise-voltage method and up-and-down method on flashover of insulators contamination in salt fog environment simulation,obtained flashover voltage under different salt density,and compare the curve fitting results. The experimental results show that the results obtained by the risevoltage method are higher than that of the up-and-down method in the experiment of AC salt fog flash-over test. The flash-over voltage gap between the two methods is in the range of 14% to 36%. The results can be used as reference in artificial salt spray test in different research units.