马传宝（中广核清洁能源科技（上海）有限公司，上海市 200241）

马传宝

Analysis of the Characteristics of Low‑resistance Earthing Methods

in Medium‑voltage AC Systems

MA Chuanbao(CGN Clean Energy Technology(Shanghai)Co.,Ltd.,Shanghai 200241，China)

Abstract：Two methods for calculating low resistance values are introduced,and suggestions for selecting resistance values are provided based on the characteristics of low‑resistance earthing in medium‑voltage AC system,combined with relay protection and system safety requirements. In addition,different earthing methods for medium‑voltage AC system have a significant impact on equipment selection. Based on standard specifications,the differences in equipment selection have been sorted out for the reference of designers.

Key words：medium‑voltage AC system;low‑resistance earthing;earth‑electrode network;low resistance value;power‑frequency fault voltage;single‑phase earth short‑circuit current;fault clearance time;equipment selection

摘　要：根据中压交流系统低电阻接地方式的特点，结合继电保护和系统安全要求，介绍两种低电阻阻值计算方法，给出阻值选择的建议。此外，中压交流系统不同接地方式对设备选型有重要影响，结合标准规范要求，对设备选型差异进行梳理，以供设计人员参考。

关键词：中压交流系统；低电阻接地；接地网；低电阻阻值；工频故障电压；单相接地短路电流；故障切除时间；设备选型

中图分类号：TU852                 　  文献标识码：A

doi：10.3969 / j. issn.1003 － 8493.2024.09.008