220kV开关站接地设计分析  

Analysis on Design for Earthing of 220kV Switch Station

作　　者：丁钰 张麒 于海承 DING Yu;ZHANG Qi;YU Haicheng(North China Power Engineering Co.,Ltd.of CPECC,Beijing 100120,China)

机构地区：[1]中国电力工程顾问集团华北电力设计院有限公司,北京100120

出　　处：《河北电力技术》2024年第2期85-89,共5页Hebei Electric Power

摘　　要：变电站合格接地网是电力系统安全运行的保障。设计人员对开关站等小型变电站接地设计的关注程度相对较低,在简化接地计算时存在一些误区。以某实际工程为例,通过对开关站接地进行仿真计算和分析,明确了跨步电压值、接触电压值和地电位升值为接地网合格的几个关键判据,并分析确定了接地网最大入地电流值和土壤电阻率是影响他们的主要因素,探讨了简化接地计算方法,纠正了接地工程设计计算初始条件的错误取值方法,给出有效的接地优化方案和降阻措施,研究结论对小型变电站的接地设计具有借鉴意义。The qualified earth-electrode network of the substation is crucial for the power system's reliability.Designers pay less attention to earthing in small substation,leading to misunderstandings in simplifying calculations.Through simulation calculations and the analysis of a practical project,this study clarifies that step potential difference,touch potential difference,and earth potential difference are key criteria for qualified earthing.It simultaneously analyzes and identifies the maximum grid current and soil resistivity as the main factors affecting them.The study explores simplified earthing calculation methods,corrects initial values,provides scenarios for earthing optimization and suggests measures to reduce earthing resistance.The research conclusions can serve as a reference for earthing design in small substations.

关 键 词：开关站 接地 土壤电阻率 跨步电压值 接触电压值 地电位升值 

分 类 号：TM63[电气工程—电力系统及自动化]