高土壤电阻率地区某220 kV变电站接地方案研究  

Study on Grounding Scheme of a 220 kV Substation in High Soil Resistivity Area

作　　者：邢琳 陈明 吴景梅 王璐[2] 李军 XING Lin;CHEN Ming;WU Jingmei;WANG Lu;LI Jun(State Grid Hebei Economic Research Institute,Shijiazhuang 050000,China;Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;Baoding Jida Electrical Power Design,Baoding 071051,China)

机构地区：[1]国网河北省电力公司经济技术研究院,石家庄050000 [2]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003 [3]保定吉达电力设计有限公司,河北保定071051

出　　处：《电瓷避雷器》2020年第4期167-172,177,共7页Insulators and Surge Arresters

摘　　要：处于高土壤电阻率地区的变电站,其接地网的接地性能难以满足要求。以高土壤电阻率地区某220 kV变电站为例,对其接地方案进行优化设计研究。基于接地分析软件CDEGS,完成了接地网网格优化、二次电缆芯皮电位差的计算及接地深井等降阻措施研究;基于电磁暂态分析软件EMTP,计算了变电站低压避雷器耐受地电位升上限,结合变电站设备的运行参数及规范对接地参数的要求,得到了地电位升允许上限值。最后考虑网格优化、降阻措施和技术经济性,给出了高土壤电阻率地区某220 kV变电站接地网的设计方案。At high soil resistivity area,the grounding performance of substation grounding system is difficult to meet the requirements.Taking a 220 kV substation in high soil resistivity area as an example,the optimal design of grounding scheme is studied.Based on the grounding analysis software CDEGS,the grid optimization of grounding system,the calculation of potential difference between core wire and shielding lay of secondary cable and the research on resistance reduction measures of grounding deep wells are completed;Based on the electromagnetic transient analysis software EMTP,the withstand voltage limitation of substation low-voltage arrester is calculated.Combined with the operation parameters of substation equipment and the requirements of ground parameters specified in the specification,the upper limit of ground potential rise(GPS)is obtained.Finally,considering grid optimization,resistance reduction measures and technical economy,the design scheme of grounding network for a 220 kV substation in high soil resistivity area is proposed.

关 键 词：高土壤电阻率 网格优化 避雷器 芯皮电位差 

分 类 号：TM63[电气工程—电力系统及自动化] TM863