基于故障支路端口特性定理的变电站接地网电磁联合故障诊断  

Joint Fault Diagnosis of Substation Grounding Network Based on the Theorem on the Port Characteristics of Fault Branch

作　　者：王永翔 陈冠 范丽君 袁思远 王昕[1] WANG Yongxiang;CHEN Guan;FAN Lijun;YUAN Siyuan;WANG Xin(Center of Electrical&Electronic Technology,Shanghai Jiao Tong University,Shanghai 200240,China;Jiading Power Supply Company,State Grid Shanghai Municipal Electrical Power Company,Shanghai 201800,China)

机构地区：[1]上海交通大学电工与电子技术中心,上海200240 [2]国网上海市电力公司嘉定供电公司,上海201800

出　　处：《电瓷避雷器》2022年第4期75-83,共9页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:61673268)。

摘　　要：变电站接地网一旦出现腐蚀、断裂故障将危及整个系统的安全稳定,因此,对接地网的在线故障检测具有一定的工程应用前景。针对电网络检测方法诊断方程高度欠定、磁场检测方法测量数据量极大的问题,笔者提出并证明了故障支路端口特性定理,并据此提出了一种基于电磁联合诊断方法。首先对接地网进行电网络建模,提出并证明了故障支路端口特性定理。应用该定理可以在仅测量网络端口电阻值的情况下无需求解支路阻值,快速诊断出故障区域。再针对局部的故障区域用磁场反演的方法,根据实际磁场分布检测出具体的故障支路,并用并联补偿、循环测量的方法找出其余区域的故障支路。最后通过对某接地网的实际应用分析,验证了本方法的有效性。综上可知,本方法融合了电网络定位快速、方便和局部磁场反演诊断准确、直观的优点,具有计算量较小、求解精度高、检测直观等优点。Once the substation grounding grid is corroded or broken,it will endanger the safety and stability of the entire system.Therefore,the online fault detection of the grounding grid has a certain engineering application prospect.Aiming at the problem of the high degree of under-determination of the diagnosis equation of the electrical network detection method and the extremely large amount of measurement data in the magnetic field detection method,the author proposes and proves the port characteristic theorem of the fault branch,and proposes a combined electromagnetic diagnosis method based on this.Firstly,the grounding grid is modeled on the electrical network,and the characteristic theorem of the fault branch port is proposed and proved.Applying this theorem can quickly diagnose the fault area without solving the branch resistance when only measuring the resistance of the network port.Then,the method of magnetic field inversion is used for the local fault area,and the specific fault branch is detected according to the actual magnetic field distribution,and the fault branch in the remaining area is found by the method of parallel compensation and cyclic measurement.Finally,the effectiveness of this method is verified by analyzing the actual application of a certain grounding grid.In summary,the method combines the speed and convenience of the electrical network method with the accuracy and intuitiveness of the magnetic field inversion diagnostic method,and has the advantages of small calculation amount,high solution accuracy,and intuitive detection.

关 键 词：接地网 故障诊断 电网络分析 磁场反演 联合诊断 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM63