变电站接地网电磁诊断法的试验研究  

Experimental studies on substation grounding grid fault diagnosis using electromagnetic diagnosis method

作　　者：施会 王丰华[2] 胡徐铭 茅晓亮 吕佩佩 孟琦斌 Shi Hui;Wang Fenghua;Hu Xuming;Mao Xiaoliang;Lv Peipei;Meng Qibin(Fengxian Power Supply Branch Company,Shanghai Municipal Electric Power Company,Shanghai 201400,China;Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]国网上海市电力公司奉贤供电公司,上海201400 [2]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《电测与仪表》2018年第16期6-12,共7页Electrical Measurement & Instrumentation

摘　　要：为进一步提高变电站接地网故障诊断的准确性,本文以某实际35 k V变电站接地网为研究对象,通过模拟接地网导体腐蚀、断裂、虚焊等典型故障,对接地网正常与典型故障下的地表电位和磁感应强度进行了测试分析。试验结果表明:接地网导体出现不同故障类型时,地表电位和磁感应强度呈现出不同的变化规律,综合分析接地网的地表电位和磁感应强度可较为准确地实现变电站接地网故障诊断及故障类型识别。接地网存在混合故障时,故障导体地表电位和磁感应强度变化规律与单一故障的情形类似,但变化幅度更大。研究结果可为变电站接地网的故障诊断提供重要依据。In order to further increase the accuracy of fault diagnosis of substation grounding grids,a 35kV substation is studied to measure the surface potential and magnetic induction intensity under normal conditions and typical faults,where the faults of corrosion,broken and incomplete weld are simulated in this paper.The test results have shown that,the surface potential and magnetic induction intensity of grounding grid are changed differendy under different fault circumstances.According to the comprehensive analysis of the variations of surface potential and magnetic induction intensity,the fault and its type can be identified accurately.For the hybrid fault in grounding grid,the variations of surface potential and magnetic induction intensity are similar to the single fault with larger variation degree.This result may provide important basis for future fault diagnosis of substation grounding grid.

关 键 词：双模式切换 接地网 地表电位 磁感应强度 故障诊断 

分 类 号：TM933[电气工程—电力电子与电力传动]