伞裙结构对绝缘子表面流注发展特性的影响

发布时间：2018-05-12 06:25

本文选题：沿面闪络 + 流注放电　；参考：《中国电机工程学报》2014年03期

【摘要】：绝缘子伞裙结构的设计要考虑诸多影响因素,合理的设计绝缘子的伞裙结构可以提高沿面闪络电压,保证输电线路供电的可靠性。研究了伞裙结构对沿面预放电(流注放电)特性的影响,从如何抑制沿面流注放电的角度探讨了绝缘子伞裙结构的设计。从沿面流注放电的试验结果发现:光滑圆柱绝缘子表面流注拥有两个分量,即"沿面分量"和"空气分量",而带伞裙的绝缘子表面流注"沿面分量"不能越过伞裙传播到达上极板,只有"空气分量"可以到达上极板。此外,带伞裙绝缘子表面流注稳定传播场强大于光滑绝缘子表面流注稳定传播场强。沿面流注稳定传播场强与伞裙直径成正比,而相同电场下的流注传播速度则和伞裙直径成反比。伞裙位置对流注传播特性也有很大影响,在一定距离范围内,伞裙越靠近流注起始位置,流注传播越困难。
[Abstract]:Many factors must be considered in the design of insulator umbrella skirt structure. Reasonable design of insulator umbrella skirt structure can improve flashover voltage along the plane and ensure the reliability of transmission line power supply. The influence of umbrella skirt structure on the characteristics of surface predischarge (streamer discharge) is studied. The design of insulator umbrella skirt structure is discussed from the point of view of how to suppress the flow discharge along the surface. From the experimental results of streamer discharge along the surface, it is found that the flow discharge on the surface of a smooth cylindrical insulator has two components. The "plane component" and "air component" of the insulator with an umbrella skirt can not be propagated over the skirt to the upper polar plate, but only the "air component" can reach the upper pole plate. In addition, the steady propagating field intensity of streamer on the surface of insulator with umbrella skirt is larger than that of smooth insulator. The steady field strength of flow along the surface is proportional to the diameter of the umbrella skirt, while the velocity of the flow is inversely proportional to the diameter of the umbrella skirt under the same electric field. The location of umbrella skirt also has a great influence on the characteristics of streamer propagation. In a certain distance, the closer the skirt is to the initial position of the streamer, the more difficult it is to propagate the streamer.
【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项目(973项目)(2011CB209406) 国家自然科学基金项目(50777033,50977048)~~
【分类号】：TM216

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