1000kV特高压变电站接地网布置方案分析

Analysis on 1 000 kV Ultra-high Voltage Substation Grounding Grid Layout Plan

结合电力系统电压等级升高、容量增加、短路入地电流增大等情况,以北京西1 000kV变电站的接地网布置为例,提出北京西1 000kV变电站接地网布置方案,从土壤模型、地电位升、分流系数和接地短路电流等方面对该方案进行分析,经建模计算验证,该方案满足安全性要求,具有可行性。

Combined with the development of power system,the scale of voltage grade,capacity,and short-circuit current is increasing.Beijingxi 1000 kV substation is taken as an example,and 1000 kV ultra-high voltage substation grounding grid layout plan is put forward.The soil resistivity model,ground potential rise,current division factor and grounding short circuit current of the layout plan is analyzed.The layout plan meets the security requirements and which is feasible through the calculation of model.