兴安直流线路纵差保护原理的改进  

Improvement of DC Line Longitudinal Differential Protection Principle in Xing-An HVDC System

作　　者：李标俊[1] 郭琦 贾旭东 刘涛 

机构地区：[1]中国南方电网超高压输电公司天生桥局,贵州兴义562400 [2]南方电网科学研究院,广州510080

出　　处：《南方电网技术》2015年第3期28-30,共3页Southern Power System Technology

摘　　要：结合一起兴安直流线路因高阻接地故障引起的跳闸事故,通过对87DCLL逻辑的分析,对兴安直流线路纵差保护原理进行了改进。提出将87DCLL去掉"600 ms闭锁逻辑",并基于仿真结果将保护延时调整至800 ms。仿真结果验证了所提措施不会导致87DCLL出现误动,并且在直流线路发生高阻抗接地故障时87DCLL能正确动作。Based on analysis of a tripping accident in Xing-An HVDC system due to high impedance ground fault and the logic of 87DCLL, this paper presents an improvement of the DC line longitudinal differential protection principle. It is proposed to remove the＆quot;600 ms blocking logic＆quot; from 87DCLL, and adjust the delay to 800 ms based on simulation results. Simulation results demenstrate that the proposed measures would not lead to 87DCLL malfunction, and 87DCLL can operate correctly when a high-impedance ground fault occurs in the DC line .

关 键 词：直流输电 直流线路纵差保护 实时数字仿真系统 高阻抗接地故障 

分 类 号：TM713[电气工程—电力系统及自动化]