基于“开断效应”的绝缘子半导体防覆冰涂层防冰机理与运行特性

Anti-icing Mechanism and Operation Performance Research of Insulator String by Using Semiconductive Coating Based on Switch-off Effect

输电导线的直流融冰技术已经相对成熟,而绝缘子的防覆冰问题至目前为止还没有有效的防治措施。为此,重点介绍了基于半导体硅橡胶和开断效应的绝缘子电热防冰方法,并通过人工气候室内绝缘子串防冰试验分析了其防覆冰机理,分析讨论了分别于2010年和2011年在云南和广东地区进行的现场试验情况。现场试验结果表明:通过对提高半导体硅橡胶涂层基胶的粘度、控制涂层电阻在0.3 MΩ以下及优化涂层在绝缘子表面的涂刷位置和改善现场施工工艺,可明显改善半导体硅橡胶防覆冰涂层绝缘子串在实际运行中的防冰特性。2011年冬季在广东地区35kV连禾线和110kV阳电线试点杆塔发现半导体涂层绝缘子串能够明显地减缓覆冰的增长。

Since the icing disaster happened in the South of China in 2008,the anti-and de-icing technology for protecting overhead power network equipment has become a key technology that ensures the safe operation of the electric system.So far,there are no effective mitigation measures for icing of insulators,compared with the relatively mature technology of DC ice-melting.Thus,an anti-icing thermal method for insulators based on semiconductive silicone rubber coating and switch-off effect was proposed.Meanwhile,the anti-icing performance of the insulator strings in the climate chamber was analyzed.The site operations of the anti-icing coating in Guangdong and Yunnan in 2010 and 2011 were summarized.The field results show that the insulator strings treated with semiconductive coating perform better with the increase of the rubber viscosity,the resistance below 0.3 MΩ,and the optimization of the configuration of the coating as well as the optimized construction craft.In the winter of 2011,the ice accretion was greatly reduced on towers of the 35 kV Lianhe Line and 110 kV Yangdian Line,which were treated with semiconductive coating.