500kV输电线路杆塔接地网不同环境下优化降阻方案研究.PDF

第46 卷 第13 期 电力系统保护与控制 Vol.46 No.13 2018 年7 月1 日 Power System Protection and Control Jul. 1 20 18 DOI: 10.7667/PSPC170851 500 kV 输电线路杆塔接地网不同环境下优化降阻方案研究 刘文军，仇彦军，孙立臣 (国网北京密云供电公司，北京 100031) 摘要：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 重、稳定性差和使用寿命短等问题，以 500 kV 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。 关键词：接地网；工频接地电阻；土壤电阻率；优化降阻 Research on resistance reducing scheme optimization of 500 kV transmission line tower grounding grid in different environments LIU Wenjun CHOU Yanjun SUN Lichen (State Grid Beij ing Electric Power Company Beij ing 100031 China) Abstract: 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 obj ect. 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 st