基于投切装置的小电流接地故障定位方法研究  

Research on location method of small current grounding fault based on switching device

作　　者：尹扬 薛涛 YIN Yang;XUE Tao(China Southern Power Grid Shenzhen Power Supply Co.,Ltd.,Shenzhen 518000,China;China Southern Power Grid Shenzhen Digital Grid Research Institute Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]中国南方电网有限责任公司深圳供电局有限公司,广东深圳518000 [2]南方电网深圳数字电网研究院有限公司,广东深圳518000

出　　处：《电气应用》2021年第6期88-94,共7页Electrotechnical Application

基　　金：南方电网公司科技项目资助(52180029)。

摘　　要：为了解决消弧线圈的应用和接地故障的选线定位技术之间的矛盾,以残留增量法作为参考,采用一种基于投切装置与FTU的馈线自动化技术配合作用的故障选线定位方法,在系统故障发生时,投切装置所产生的电流首半波叠加于系统故障线路零序残流之上,通过监测各出线零序电流的变化量,便可实现故障选线。将投切装置应用于配电网自动化系统中,使其与馈线自动化技术配合,通过MATLAB/Simulink搭建系统模型,并仿真验证了此原理方法的可行性。此方法保证了系统的稳定性,并且不受故障点接地电阻大小的影响。In order to solve the contradiction between the application of the arc suppression coil and the positioning technology of ground fault line selection,with residual incremental method for reference,a fault line selection,positioning method based device and FTU based feeder automation technology is adopted.When the system failure occurs,the current produced by switching device in the first half wave is superposed on the system fault line zero sequence residues,by monitoring the change of line zero sequence current,the fault line selection is realized.The switching device is applied in the distribution network automation system to make it cooperate with the feeder automation technology.The system model is built through MATLAB/Simulink,and the feasibility of the principle and method is verified by simulation.This method ensures the stability of the system and is not affected by the grounding resistance at the fault point.

关 键 词：消弧线圈 FTU 投切装置 馈线自动化 配电网 

分 类 号：TM862[电气工程—高电压与绝缘技术]