基于PT取电策略的配电架空线路断线故障诊断方法  

Fault Diagnosis Method for Disconnection Fault of Overhead Distribution Line Based on Power Supply Strategy of PT

作　　者：刘王春 欧朱建 黄冬冬 张雨萌 胡宇 吴天辰 LIU Wangchun;OU Zhujian;HUANG Dongdong;ZHANG Yumeng;HU Yu;WU Tianchen(State Grid Nantong Power Supply Company,Nantong,Jiangsu 226000,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]国网南通供电公司,江苏南通226000 [2]河海大学能源与电气学院,南京211100

出　　处：《南方电网技术》2024年第6期131-137,共7页Southern Power System Technology

基　　金：国家重点研发计划资助项目(2019YFE0118400)。

摘　　要：配电网断线故障一般基于电压或结合电压电流诊断,且假定3个线电压和3个相电流均可获取,并未考虑量测装置的实际配置情况。实际架空配电线路一般仅配置双PT(potential transformer)或单PT,仅可获取2个线电压或1个线电压,导致已有诊断方法在部分故障工况下无效。首先建立了断线故障下线电压方程,进而论证基于两个线电压诊断断线故障在双PT工况下可行及在单PT工况下不可行;其次提出一种PT滑动组合取电配置策略,创新地将单PT引入断线故障诊断,提高断线故障诊断精度;最后通过PSCAD/EMTDC搭建中压配电线路模型,验证了提出的取电配置策略及断线故障诊断策略的有效性。Distribution network disconnection fault diagnosis is generally based on voltage or combined with voltage and current relationship,and it is assumed that three line voltages and three phase currents can be obtained,without considering the actual configuration of measuring devices.Actual overhead distribution lines are usually only configured with double PT or single PT,and can only obtain two or one line voltage,resulting in invalid of existing diagnosis methods under partial fault conditions.Firstly,the line voltage equationas under the condition of disconnection fault are established,and the feasibility of using two line voltages relation to diagnose the disconnection fault under the condition of double PT and the infeasibility under the condition of single PT are demonstrated.Secondly,a PT sliding combination power supply configuration strategy is proposed.Single PT is innovatively used for disconnection fault diagnosis,which further improves the diagnosis accuracy.Finally,PSCAD/EMTDC is used to build a medium voltage distribution line model to verify the effectiveness of the proposed power supply configuration strategy and disconnection fault diagnosis strategy.

关 键 词：断线故障 双PT 单PT 取电配置策略 PT滑动组合 

分 类 号：TM73[电气工程—电力系统及自动化]