可消除过渡电阻影响的单相接地距离保护研究  

Research on Single Phase Grounding Distance Protection Against Transition Resistance

作　　者：郑涛[1] 王可坛 刘校销 祁欢欢 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),北京市昌平区102206 [2]先进输电技术国家重点实验室(全球能源互联网研究院),北京市昌平区102211

出　　处：《电网技术》2017年第12期4045-4053,共9页Power System Technology

基　　金：国家高技术研究发展计划(863计划)(2012AA050401);国家电网公司科技项目(SGRI-DL-71-12-005)~~

摘　　要：针对过渡电阻使距离保护稳态超越或欠范围拒动的问题,提出了一种新型距离保护方案并深入分析了其可行性。首先,利用电压电流相量几何特性建立相似三角形,并据此构建故障距离百分比求解方程以消除过渡电阻的影响;其次,基于保护安装处负序测量电流与故障点电压相位关系,简化上述方程以解析求解故障距离。该方案仅利用单端电气量信息即可精确定位故障位置,可有效解决过渡电阻引起的距离保护拒动或超越的问题,PSCAD/EMTDC平台上的仿真实验验证了该方案的可靠性。In view of steady-state overreach and miss operation of conventional distance protection caused by transition resistance,a new single phase grounding distance protection scheme immune to transition resistance was presented and its feasibility was analyzed.Firstly,based on geometrical property of vectors of voltage and current of protective relay and fault point,similar triangles were established.On this basis,equation of fault distance was formulated to eliminate effect of transition resistance.Then using phase relationship between negative sequence current measured by distance relay and voltage at fault point,above equation of fault distance was simplified,beneficial to its quick solution.The new distance protection scheme can locate fault point with single end electric quantities and effectively solve mal-operation or miss operation problems caused by transition resistance.Validity of the new scheme was confirmed with simulations on PSCAD/EMTDC.

关 键 词：距离保护 过渡电阻 电压相量 电流相量 稳态超越 

分 类 号：TM72[电气工程—电力系统及自动化]