利用扫频法进行变电站接地网故障诊断技术研究  

Fault Diagnosis Technology of Substation Grounding Grid by Using Frequency Sweeping Method

作　　者：宋平 朱征 张琪祁 王逊峰 寇晓适 晏年平 吴旭涛 邵健康 司文荣[2] SONG Ping;ZHU Zheng;ZHANG Qiqi;WANG Xunfeng;KOU Xiaokuo;YAN Nianping;WU Xutao;SHAO Jiankang;SI Wenrong(State Grid Shanghai Municipal Electric Power Company,Shanghai 200122,China;East China Electric Power Test&Research Institute Co.,Ltd.,Shanghai 200437,China;State Grid Electric Power Research Institute,Henan Electric Power Company,Zhengzhou 450052,Henan Province,China;State Grid Electric Power Research Institute,Jiangxi Electric Power Company,Nanchang 330096,Jiangxi Province,China;State Grid Electric Power Research Institute,Ningxia Electric Power Company,Yinchuan 750011,Ningxia Hui Autonomous Region,China;Shanghai Dafan Electrical Equipment Co.,Ltd.,Shanghai 201611,China)

机构地区：[1]国网上海市电力公司,上海200122 [2]华东电力试验研究院有限公司,上海200437 [3]国网河南省电力公司电力科学研究院,河南郑州450052 [4]国网江西省电力有限公司电力科学研究院,江西南昌330096 [5]国网宁夏电力有限公司电力科学研究院,宁夏银川750011 [6]上海大帆电气设备有限公司,上海201611

出　　处：《电力与能源》2020年第5期539-542,604,共5页Power & Energy

基　　金：国网上海市电力公司科技项目(520940160020)。

摘　　要：变电站接地网故障诊断技术主要包括接地特性参数、电阻网络节点、磁感应强度、电化学分析和超声导波检测等5种常用方法。对基于信号输入输出状态响应检测的接地网故障诊断技术进行了探讨,提出了扫频法即扫频阻抗和幅频响应测试技术。利用搭建的测试系统,对8m×8m(2m等间隔)规格敷设的接地网,在设置模拟脱焊、导体断裂以及导体腐蚀缺陷3种工况下,完成了试验测试。对4通道高频采样获取的激励电流和三个响应电压波形,进行了扫频阻抗和幅频响应曲线分析。相关系数分析结果表明:设置导体断裂时的扫频电压波形、幅频响应曲线与无缺陷时的波形曲线有细微区别。Substation grounding grid fault diagnosis technology mainly includes five common methods:grounding characteristic parameters,resistance network node,magnetic induction intensity,electrochemical analysis and ultrasonic guided wave detection.This research discusses the fault diagnosis technology of grounding grid based on signal input and output state response detection,and proposes the frequency sweeping method,namely the frequency sweep impedance and amplitude frequency response testing technology.Based on the established test system,the test was completed for the grounding grid laid with the specifications of 8m×8m(2mequidistance)under three working conditions,including simulated diswelding,conductor fracture and conductor corrosion defects.It analyzeds the sweep impedance and amplitude-frequency response curves of the excitation current and the three response voltage waveforms obtained from the 4-channel high-frequency sampling.The results of correlation coefficient analysis show that there are slight differences between the swept-frequency voltage waveform and the amplitude-frequency response curve when the conductor is set to fracture and the waveform curve when there is no defect.

关 键 词：变电站 接地网 故障诊断 状态响应 扫频法 

分 类 号：TM77[电气工程—电力系统及自动化]