10 kV同杆并架线路小电流接地故障仿真分析  

Simulation Analysis of Non-solidly Grounding Fault in 10 kV Multi-circuit Distrubition Lines on the Same Tower

作　　者：谭振鹏 龚辉昶 吴海江 陈锦荣 高厚磊[2] 梁永亮[2] TAN Zhenpeng;GONG Huichang;WU Haijiang;CHEN Jinrong;GAO Houlei;LIANG Yongliang(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528000,China;College of Electrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000 [2]山东大学电气工程学院,山东济南250061

出　　处：《供用电》2022年第2期48-57,79,共11页Distribution & Utilization

基　　金：国家自然科学基金项目(52077221);中国南方电网有限责任公司科技项目(030600KK52190184GDKJXM20198132)。

摘　　要：线路走廊稀缺,使得同杆并架线路较为普遍,其更加复杂的耦合关系导致系统单相接地故障特征有所不同。利用MATLAB搭建含同杆并架双回线的10 kV中性点不接地和谐振接地系统,仿真不同故障条件下的小电流接地故障电气量暂态与稳态特征,并与不含同杆并架线路的情况进行比较。得出同杆并架线路接地时,零序电压近似不变,故障点电流的稳态分量与暂态分量均减小,2条并架线路的稳态与暂态电流幅值也减小但方向(极性)不变,仍保持故障线路与健全线路特征;其他线路接地时,同杆并架线路暂态与稳态零序电流均同步减小。Due to the scarcity of line corridors,multi-circuit lines on the same tower are comparatively common,but its more complex coupling relationship makes the characteristics of the single-phase grounding fault of the system different.The 10 kV ungrounded and resonant system with the double-circuit lines on the same tower is built by MATLAB,and the transient and steady-state characteristics of the single-phase grounding fault under different fault conditions are simulated compared with the characteristics of the single-phase grounding fault in the 10 kV non-solidly grounding system without double-circuit lines on the same tower.It is found that when the double-circuit line is grounded,the zero-sequence voltage is approximately unchanged while the steady and transient state components of the fault point current decrease.The amplitudes of the steady and transient state currents of the two double-circuit lines also decrease but the direction(polarity),remains the same,and the characteristics of the fault line and the sound line are still maintained;when another line is grounded,the transient and steady-state zero-sequence currents of the double-circuit lines on the same tower decrease synchronously.

关 键 词：同杆并架双回线 小电流接地 故障仿真 暂稳态特征 幅值比较 

分 类 号：TM73[电气工程—电力系统及自动化]