基于不对称电流的配电网接地故障区段定位  

Distribution network earth fault section location based on asymmetric current

作　　者：吴晓清[1] 杨洪耕[1] 叶茂清[2] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]四川电力试验研究院,四川成都610072

出　　处：《电工电能新技术》2013年第1期19-22,共4页Advanced Technology of Electrical Engineering and Energy

摘　　要：分析了配电网发生单相接地故障时零、负序电流的分布特征,提出了基于不对称电流的配电网接地故障区段定位方法。首先,利用仿真软件模拟采集零序电流值作为各区段上故障产生零序电流的边界值。当实际故障发生时,采集母线侧零序电流和故障前后各线路上的负序电流,与零序电流边界值比较,匹配出可能故障区段,列出区段故障状态矩阵,然后比较各线路的负序电流变化量,得到线路故障状态矩阵,结合区段故障状态矩阵和线路故障状态矩阵,形成故障判定矩阵,最终确定故障区段。该方法原理简单易行,监测点少,数据易提取,传输量小。This paper analyzes the character of the zero sequence and negative sequence current when single-phase fault occurs. A method for distribution network earth fault section location based on the asymmetric current is proposed. Firstly, single-phase faults occuring at each node are simulated, and the zero sequence current is obtained as the boundary value. When the real fault occurs, the zero sequence and negative sequence currents before and af- ter fault are acquired, and compared with the zero sequence current with the boundary value to find all the possible fault sections and list the sections fault status matrix. Then the negative sequence currents among every lines are compared, and the lines fault status matrix is obtained. Combining the sections fault status matrix and the lines fault status matrix, the fault judgment matrix is formed to recognize the real fault section. The principle of the method is simple and easy. The monitors needed are less and the amount of data transmission is small. The simulation of PSCAD testifies the validity of the method.

关 键 词：配电网 不对称电流 故障区段定位 

分 类 号：TM726[电气工程—电力系统及自动化] TM773