摘要
近年来RTV涂料广泛应用于输电线路绝缘子上,用来提高绝缘子在污秽状态下的绝缘能力。在长期的运行中,RTV涂层在表面局部放电的作用下将逐步丧失憎水性,绝缘能力也将下降。RTV涂层沿面局部放电将加速RTV涂层的老化,因此,有必要深入研究RTV涂层表面局部放电特性。介质表面局部放电的过程包含电晕放电、流注放电和电弧放电。流注放电是物理过程最复杂的,因此,本文将着重研究RTV涂层的表面流注放电特性。在"三电极"结构中,利用3个光电倍增管测量洁净和涂抹RTV涂料的绝缘介质流注传播特性。发现涂抹RTV涂料的尼龙介质表面流注稳定传播场强增加;相同电场强度下,流注传播速度降低。此外,不同厂家的RTV涂料在流注传播特性上存在差异,有些涂料不利于流注的发展,因此,将造成不同的涂料应用于输电线路时表面局部放电状况也会存在差异。
In recent years, the room temperature vulcanized(RTV) silicone rubber coatings, widely used in outdoor high-voltage insulators on overhead transmission lines, could improve the contamination performance of insulators. The RTV coatings usually lose its hydrophobicity and result in further degradation under long-term partial discharge. Therefore, it is necessary to study the characteristic of partial discharge along the RTV coated insulation surfaces. The process of partial discharge includes corona discharge, streamer discharge and arc discharge. The streamer propagation along the insulation surface is a complexest physical process. This paper focuses on the characteristics of streamer propagation along the RTV coating. In three-electrode arrangement, the characteristics of streamer propagation along clean and the RTV coated insulation surfaces are measured through three photomultipliers. The electric field required for streamer stable propagation along the RTV coated insulation surfaces is larger,and the velocity is slower in the same electric field. Furthermore, the characteristics of streamer propagation along insulation surfaces with different RTV coating are different. Some RTV coating inhibits the streamer greatly, hence, the characteristics of partial discharge along the different RTV coated insulation surfaces are different in the operation condition.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第10期318-325,共8页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划(973计划)(2011CB209406)
国家自然科学基金(50777033
50977048)资助项目
关键词
沿面闪络
流注放电
RTV涂料
“三电极”结构
流注传播特性
绝缘介质
Surface flashover,streamer discharge,RTV coating,three-electrode arrangement,streamer propagation characteristics,insulation dielectric
