基于夹角法的城市变电站接地电阻测量  

Grounding Resistance Measurement by Angle-Offset Method for Urban Substations

作　　者：钟建灵 王晶晶[2] 张波[3] 曾嵘[3] 何金良[3] 

机构地区：[1]深圳供电局,广东省深圳市518020 [2]华北电力科学研究院有限责任公司,北京市西城区100045 [3]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机工程与应用电子技术系),北京市海淀区100084

出　　处：《电网技术》2010年第6期34-37,共4页Power System Technology

摘　　要：城市变电站附近的建筑物接地网和直埋金属管线限制了变电站接地电阻测量时电流极和电压极的布置位置。分析了电流极与接地网间距离不同情况下电压极布置在不同位置时接地电阻的测量误差,并分析了土壤电阻率和电流极引线与电压极引线间夹角对接地电阻测量的影响。接地电阻测量中电压极位置可根据现场情况灵活确定,测量结束后可通过测量误差曲线修正测量结果。The grounding mesh of buildings near urban substation and metal pipelines directly embedded into ground restrain the arrangement of current electrode and potential probe while grounding resistance of urban substation is measured. The measurement errors of grounding resistance are analyzed when potential probe is arranged at different positions under different distances between current electrode and grounding mesh, and the influences of soil resistivity and the included angle between the leads of current electrode and that of potential probe on measurement of grounding resistance. During the measurement of grounding resistance the position of potential probe can be flexibly decided according to on-site condition, and the measurement result can be modified according to measurement error curve.

关 键 词：城市变电站 接地电阻 电流极 电压极 测量误差 互感 

分 类 号：TM862[电气工程—高电压与绝缘技术]