【作者】 杨大友；

【导师】 蒋兴良；

【作者基本信息】 重庆大学 ， 电气工程， 2010， 硕士

【摘要】 输电线路覆冰是电力系统安全运行最大的敌人之一,线路覆冰后其电气特性明显降低,严重时直接造成倒杆倒塌事故,给国民经济和财产带来极大的损失。目前国内外还没有能完全阻止输电线路覆冰的方法。涂料已经成功运用于防污闪,但在防覆冰中的应用还处于研究阶段,没有统一的涂料防冰效果评估的方法。本文以XP—160及LXP—160两种绝缘子及RTV涂料作为试样,对涂覆RTV涂料和未涂覆RTV涂料的绝缘子覆冰特性进行对比分析;在不同覆冰水电导率下对有涂料和无涂料的绝缘子覆冰闪络特性进行研究。对涂料与冰层间的粘结力及其影响因素进行试验研究。通过对论文研究结果的总结和分析,本文得出:RTV涂料为憎水性涂料,覆冰前接触角都大于90°,覆冰后憎水性有所降低,但是24小时候几乎完全恢复;相同环境温度条件下,涂覆RTV涂料后的绝缘子表面覆冰比未涂覆RTV涂料的绝缘子表面覆冰严重,涂覆后绝缘子间冰棱桥接速率明显加快,涂覆后绝缘子表面的冰大量以冰珠的形式存在;不同厂家生产的RTV涂料对绝缘子冰闪电压影响不一,但是冰闪电压都随电导率的增加而下降;冰与玻璃和铝板表面间粘结力很大,在涂覆RTV涂料后粘结力明显降低。随着温度的下降,冰与衬垫表面间粘结力先上升后下降;随着覆冰水电导率的增加,冰与衬垫表面间粘结力略微下降;基板、涂料的成分等都对粘结力有影响。研究表明:本文采用的测量冰与衬垫表面间的粘结力的试验方法是可行的,可以作为评估憎水性涂料防冰效果的试验方法之一,涂覆涂料后绝缘子的覆冰闪络电压也可作为其评估参考指标之一。更多还原

【Abstract】 Power Transmission Line Icing is one of the worst enemies for the safe operation of power system. When the transmission line is coated with ice, its electrical characteristics significantly lower; in severe cases, it result in the collapse accident for the poles and towers of transmission line, bringing great loss to the national economy and property. At present, there was no method yet to completely prevent power transmission line from icing both at home and abroad. Anti-fouling paints have been successfully used in pollution flashover, but the anti-icing application is still in the research stage. There is no unified anti-ice coating effect evaluation test method.In this paper,XP-160 and LXP-160 has been regarded as a test specimen, the icing covering characteristics of the RTV coated insulator and the one without RTV coating has been comparatively analyzed; at different electrical conductivity which covered with ice and water, the icing coating flashover property of coating paint and non-coating paint insulator has been studied. The cohesive force and its influence between paint and ice cap has been tested and studied. The main conclusions are: RTV coating is Hydrophobic coating,the Contact angle Greater than 90°,when ice coat on coating,the hydropobic is weaken,but 24 hours later,it is Restore.Under the same ambient temperature conditions, the surface ice coating of the RTV coated insulator is worse than the one without the RTV coating. When the insulator is coated, the icicle bridge rate between insulators accelerates noticeably, the ice on the insulators surface, exists by way of ice pellets. The RTV coating of affect differently to the insulator icing flashover voltage, but the icing flashover voltage decreases when the conductivity increases. The cohesive force between ice and glass with aluminum surface is remarkable, however, it significantly reduced after coated with RTV paint. And the cohesive force between the original substrate as the temperature dropped and with the pad surface, the cohesive force between the first increased and then decreased; With the increase in conductivity of ice cover, the cohesive force between ice and the pad surface decrease; substrate,coating composition and so on also affect the bond strength.The results show that the Measurement used in this paper is useful.It can be used to be one of the test Method of evaluation test method and the flashover voltage can be used to be the index too.更多还原