基于面积差法的小电阻接地配电网系统单相故障选线研究  

Area Difference Method-based Single-phase Faulty Line Determination inSmall Resistance Grounding Distribution Network Systems

作　　者：吴剑飞 刘源 冷婷婷 韩超 WU Jianfei;LIU Yuan;LENG Tingting;HAN Chao(Changshan County Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Quzhou 324000,China;Tongnan Power Supply Branch of State Grid Chongqing Electric Power Co.,Ltd.,Chongqing 402660,China)

机构地区：[1]国网浙江省电力有限公司常山县供电公司,浙江衢州324000 [2]国网重庆市电力有限公司潼南供电分公司,重庆402660

出　　处：《电工技术》2024年第11期95-97,102,共4页Electric Engineering

摘　　要：针对小电阻接地配电网系统单相故障频发,易影响系统安全稳定运行的问题,提出了一种基于零序电流面积差法的选线方式。首先通过分析零序电流的故障特征,得出在故障线路与非故障线路上零序电流变化方向相反;其次利用零序电流方向相反的特征,构造了线路两两对比的面积差法,并经归一化处理得到了故障选线矩阵;最后利用MATLAB/Simulink搭建10 kV小电阻接地配电网系统进行仿真验证,结果表明该方法能够准确选线,且具有一定的抗过渡电阻能力。A line determination method based on zero sequence current area difference method was proposed to address the frequent occurrence of single-phase faults affecting safe and stable operation in small resistance grounding distribution network systems.First by analyzing the fault characteristics of zero sequence current,it was found that the directions of change of zero sequence current on faulty and non-faulty lines were opposite.Second an area difference method enabling one-on-one comparison between two lines was constructed based on the aforementioned characteristic,and the faulty line determining matrix was obtained through normalization processing.Finally a simulative test on a 10 kV low resistance grounding distribution network system built by MATLAB/Simulink verified the satisfactory effectiveness in determining faulty line and a certain tolerance to transition resistance with respect to the proposed method.

关 键 词：单相故障 面积差法 零序电流 故障选线矩阵 

分 类 号：TM773[电气工程—电力系统及自动化]