涂抹RTV的绝缘介质表面流注传播特性的研究

发布时间：2018-06-21 08:55

本文选题：沿面闪络 + 流注放电　；参考：《电工技术学报》2014年10期

【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。
[Abstract]:In recent years, RTV coatings have been widely used in transmission line insulators to improve insulator insulation capability under polluted conditions. In the long run, RTV coating will lose hydrophobicity gradually under the action of surface partial discharge, and the insulation ability will also decrease. The partial discharge along the surface of RTV coating will accelerate the aging of RTV coating. It is necessary to study the partial discharge characteristics of RTV coating surface. The process of partial discharge on dielectric surface includes corona discharge, current discharge and arc discharge. Streamer discharge is the most complex physical process. Therefore, the surface discharge characteristics of RTV coating are studied in this paper. In the "three-electrode" structure, three photomultiplier tubes are used to measure the flow propagation characteristics of insulating media in clean and coated RTV coatings. It is found that the steady propagating field strength of flow injection on the surface of nylon coated with RTV coating is increased, and the velocity of flow beam propagation is decreased under the same electric field intensity. In addition, there are differences in the characteristics of streamer propagation in RTV coatings from different manufacturers, some of which are not conducive to the development of streamer. Therefore, there will be differences in surface partial discharge (PD) status when different coatings are applied to transmission lines.
【作者单位】：清华大学深圳研究生院;中国电力科学研究院;
【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
【分类号】：TM216

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