基于六序电流分量的同塔多回线横差保护选线元件

Fault Line Selection Component of Transverse Differential Protection Based on Six-sequence Current Component for Multi-circuit Transmission Line on Same Tower

基于同塔多回线的六序分量法解耦分析,提出了3种基于六序分量序电流的横差保护选线元件,形成了新的同塔多回线横差保护方案。文中分析了故障时选线元件的动作情况,探讨了横差保护在同塔多回线中的应用方案。基于新选线元件的保护方案对于单回线故障灵敏度高,且由于保护算法不涉及电压,与传统的电流方向选线元件相比,具有不受电压互感器断线影响的优点。利用PSCAD/EMTDC仿真软件进行了大量仿真,对几种选线方案进行了比较分析,证实了该保护方案的可行性。

Based on the decoupling analysis of six-sequence component method for multi-circuit transmission line on the same tower,three fault line selection components of transverse differential protection are proposed to form a new transverse differential protection scheme for the multi-circuit transmission line on the same tower.The action of the three new fault line selection components is analyzed.Application of the new transverse differential protection scheme for the multi-circuit transmission line on the same tower is discussed.The new protection scheme has high sensitivity for the single transmission line fault.Different from traditional transverse differential protection,the breaking fault of potential transformer has no influence on the new protection because the new protection algorithm is not related to voltage.Lots of simulation results with PSCAD/EMTDC verify the feasibility of the new transverse differential protection through comparing several fault line selection schemes.