PRTV涂料对绝缘子串交流冰闪电压的影响

PRTV涂料具有良好的防污闪性能,但用于防覆冰闪络方面,国内外的相关研究还鲜有报道。根据人工气候室的试验结果,笔者分析了在覆冰期、融冰期覆冰水电导率和串长对涂有PRTV绝缘子串的覆冰闪络电压的影响。通过对涂有和未涂PRTV两种形式绝缘子串的覆冰闪络特性的分析,得出PRTV对于提高覆冰绝缘子闪络电压没有效果,涂PRTV的绝缘子串其冰闪电压约降低10%～15%;PRTV涂层的憎水性引起绝缘子表面覆冰状态发生变化,使得冰层与涂料表面粘附不紧密,内部存在许多微小气隙,容易产生局部放电和局部电弧,从而损坏PRTV涂层,导致绝缘子串泄漏电流增大。

Effect of PRTV Coating on AC Flashover Voltage of Ice-covered Insulator Strings

The PRTV coating material has perfect performance of anti-pollution flashover,but for the anti-icing flashorer,the research in domestic and abroad have also reported fresh.According to the test results obtained from the artificial climate chamber,the author analyzed the effects of icing-water conductivity and string length on AC flashover performance of a insulator string coated with PRTV during icing and melting regime.Comparing the insulators with or without PRTV coating,the test results show that PRTV coating material exerts no effect on increasing flashover voltage of iced insulators,and the flashover voltage of insulator strings with PRTV coating decreases by about 10%～15%.The hydrophilicity of PRTV layer changes the ice status of insulator string surface,and creates many minute airspaces in the ice layer.These airspaces are inclined to cause partial discharge and damage PRTV layer,hence to increase the leakage current of insulators.