基于ATP-EMTP对新型输电线路杆塔接地型式的研究

Research on the Tower Grounding Type of the New Type of Transmission Line Based on ATP-EMTP

针对近年来雷雨天气愈加频繁而对电对力系统的供电稳定安全性造成的严重的影响这一现象,优化接地装置形状,降低杆塔的冲击接地电阻,从而提高输电线路杆塔的供电可靠性。采用接地体冲击放电时考虑火花放电效应的等效半径的计算方法,建立接地体π型等效模型,以长度为20 m的单根水平接地体为例,利用ATP-EMTP软件仿真计算验证了该计算方法的准确可靠性。应用该方法对相同条件下放射接地极与加上补充树枝状的放射接地极的冲击接地电阻进行了比较分析,得出补充树枝状的放射接地极能够使接地体的冲击接地电阻得到有效的减小,从而使线路的耐雷水平得到提升,电力系统的可靠运行得到保障。

Aims at the thunderstorm weather in recent years more and more frequent and seriously affects the safety of power supply of the power system stability,this phenomenon by connecting to device shapes are optimized to reduce the impact of the tower grounding resistance,improve the safety of the transmission line tower stability. In this paper,by considering the spark discharge effect impact discharge grounding body and the calculation method of the equivalent radius of grounding body type PI equivalent model is set up,with a single level of grounding body 20 m in length,for example,through the ATP-EMTP simulation and verified the feasibility of effective calculation method. Puts forward the radiation of supplementary dendritic grounding device,using calculation method proposed in this paper,on the same conditions and add supplementary radiation grounding of dendritic radiation grounding,grounding resistance has carried on the comparative analysis of the impact of draw supplementary dendritic radiation grounding electrodes can effectively decrease the impulse grounding resistance of grounding body,can improve the line lightning resisting level,to ensure the safe and stable operation of power system has important significance.