500 kV输电线路杆塔接地网不同环境下优化降阻方案研究

为了解决优化电力系统输电线路杆塔接地网接地装置存在的腐蚀严重、稳定性差和使用寿命短等问题,以500 k V输电线路接地网模型作为研究对象,提出适用于不同环境的接地系统优化方案。利用CDEGS进行仿真,在结合接地网接地材料类型及布置型式的前提下,分析不同类型的土壤及地网面积对镀锌铜和铜覆钢接地网工频接地电阻和冲击接地电阻的影响。通过CDEGS仿真计算对降阻方式进行分析,得出了杆塔在不同土壤情况和地网面积下的各优化降阻措施。最后通过实验验证该结论的正确性,对输电线路杆塔接地的运行有重要实践意义。

Research on resistance reducing scheme optimization of 500 kV transmission line tower grounding grid in different environments

In order to solve the problems of power system transmission line tower grounding device, such as serious corrosion, poor stability, short life, etc., the optimization scheme for grounding system in different environments is proposed when choosing the 500 kV transmission line grounding grid model as the research object. Based on the grounding material type and layout form of grounding grid, the CDEGS software simulation is used to analyze the effects of different types of soil and ground network area on power frequency grounding resistance and impulse grounding resistance of galvanized copper, copper clad steel material. Resistance reduction modes are analyzed by CDEGS, and optimization measures of reduction in resistance under different soil conditions and ground network area are proposed. Finally, the conclusion of this paper is verified by experiments, which have important practical significance for the operation of transmission line tower grounding devices. This work is supported by National Natural Science Foundation of China (No. 51507122)