电阻抗扫描成像技术在变电站接地网故障诊断中的应用研究  

Study on Application of Electrical Impedance Scanning in Fault Diagnosis of Grounding Networks in Substation

作　　者：陈建伟 钱洲亥 胡家元 

机构地区：[1]中电华创电力技术研究有限公司,上海200081 [2]国网浙江省电力公司电力科学研究院,杭州310014

出　　处：《浙江电力》2017年第10期27-30,共4页Zhejiang Electric Power

基　　金：国网浙江省电力公司科技项目(5211DS14005D);杭州意能电力技术有限公司科技项目(EPRD2016-03)

摘　　要：采用电阻抗扫描成像技术对某220 kV变电站接地网的腐蚀和断裂情况进行检测与诊断,检测结果表明:接地网整体阻抗值为43 mΩ,各区域支路阻抗值都在允许范围内,接地网整体接地状况良好。发现Ⅰ区域的8号引下线接地电阻大于50Ω,经过开挖证明此引下线存在严重腐蚀,已与主接地网断开,建议及时修复并采取保护措施。电阻抗扫描成像技术能够对运行多年变电站的接地网腐蚀及断裂状况进行快速有效诊断,减少接地网腐蚀诊断的盲目性和工作量,提高了电力系统运行的安全可靠性。Electrical impedance scanning is used to detect and diagnose grounding grid corrosion and fracture in a 220 kV substation.The detection result shows that the overall grounding resistance value is 43 mΩ,the branch impedance values are within allowable range,which means that the overall grounding grid is in good condition.It is found that the value of grounding resistance of No.8 deflector is larger than 50 Ω.After excavation,it is found that the deflector gets seriously corroded and disconnected with the main grounding grid.Timely repair and protective measures are suggested.Electrical impedance scanning can be used to detect and diagnose corrosion or fracture of grounding grid of old substations rapidly and effectively.It can reduce blindness and workload of grounding grid corrosion detection and improve safety and reliability of power system operation.

关 键 词：电阻抗扫描成像 变电站 接地网 故障诊断 

分 类 号：TM63[电气工程—电力系统及自动化] TM862