500kV交流输电线路绝缘子并联间隙电弧运动特性

发布时间：2018-12-06 10:27

【摘要】：绝缘子并联间隙是输电线路雷电防护的有效手段之一。文章对500kV线路所用并联间隙的设计参数及其对电弧运动的影响进行了全面的研究。建立了绝缘子并联间隙的电弧运动仿真模型,通过仿真计算,研究了上下并联间隙的罩入比、罩入深度、尺寸以及短路电流对并联间隙间电弧运动情况的影响,详细分析了电弧所受的间隙磁场力、同侧导线磁场力和异侧导线磁场力的特征。仿真结果表明,上间隙电极的弯折角度不应过大,采用上下罩入深度比例2:1的设计,保证起弧点远离绝缘子,同时还防止了电弧上弧根在上间隙弯折处向绝缘子方向运动,绝缘子裸露空气部分85%。推荐并联间隙上下导体水平布置且端部距离绝缘子水平距离为700mm/700mm宽度的设计尺寸。
[Abstract]:The parallel gap of insulators is one of the effective methods for lightning protection of transmission lines. The design parameters of parallel gap used in 500kV line and its influence on arc motion are studied in this paper. The simulation model of arc motion of parallel gap of insulator is established. Through simulation calculation, the effects of the ratio of the upper and lower parallel gap, the depth of the cover, the size and the short circuit current on the movement of the arc between the parallel gap are studied. The characteristics of the gap magnetic field force, the magnetic field force on the same side wire and the magnetic field force on the different side wire are analyzed in detail. The simulation results show that the bending angle of the upper gap electrode should not be too large. The design of 2:1 ratio of upper and lower cover depth ensures that the starting point of arc is far from the insulator, and at the same time preventing the arc root from moving in the direction of insulator at the bend of upper gap. Insulator exposed air part 85g. The design dimensions of horizontal arrangement of upper and lower conductors with parallel clearance and horizontal distance of end distance insulator are recommended as 700mm/700mm width.
【作者单位】：南瑞集团公司(国网电力科学研究院);国家电网公司;国网浙江省电力公司;电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);
【基金】：国家电网公司科技指南项目(5211JH1500X7)~~
【分类号】：TM863

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