地线绝缘子间隙击穿对地线电流影响规律研究

发布时间：2018-01-27 02:19

  本文关键词： 输电线路 地线绝缘子 接地电阻 感应电压 感应电流　出处：《电瓷避雷器》2017年05期 　论文类型：期刊论文

【摘要】：架空地线绝缘子间隙被外力改变或遭受过电压作用下会发生间隙性击穿,严重时会出现持续燃弧的现象,实时监测地线上的电流变化情况对于架空地线的可靠运行意义重大。通过PSCAD仿真软件,建立输电线路模型,计算正常运行情况下的地线电流并分析影响因素并通过电弧开断模型分别分析了间隙击穿时刻、电弧持续时间、多点间隙击穿等因素对地线电流的影响,结果表明,线路的电压与地线电流呈正比,而电流与接地电阻不影响地线电流。同时,间隙击穿的位置、时刻和持续时间均会对击穿曲线产生不同程度影响。研究结果为架空输电线路地线状态监测提供思路和理论依据。
[Abstract]:The gap of the overhead ground wire insulator is changed by external force or overvoltage will occur gap breakdown, serious will appear the phenomenon of continuous arc burning. The real-time monitoring of the current change on the ground wire is of great significance for the reliable operation of the overhead ground wire. The transmission line model is established by PSCAD simulation software. The ground current under normal operation is calculated and the influence factors are analyzed. The effects of gap breakdown time arc duration and multi-point gap breakdown on ground current are analyzed by arc breaking model. The results show that the voltage of the line is proportional to the ground current, while the current and the grounding resistance have no effect on the ground current. At the same time, the location of gap breakdown is not affected. Both the time and duration have different effects on the breakdown curve, and the results provide a theoretical basis for the ground line condition monitoring of overhead transmission lines.
【作者单位】： 国家电网湖北省电力公司检修公司;
【分类号】：TM75
【正文快照】： 0引言目前国内500 k V及以上交流超、特高压输电线路大多采用地线分段绝缘(每段长10~30 km)、一点接地的运行方式,正常运行时无感应电流通路,能量损耗很小,避雷线起着保护输电线路不易遭受雷击的重要作用,但同时它也增加了线路中的电能损耗。而对于超、特高压的线路来说,其输，

本文编号：1467283