T接输电线路故障精确定位方法研究

Research on Fault Location Method of T-connected Power Transmission Line

随着电力系统的发展和负荷密度的增长,高压电网中越来越多地出现了T型(三端)输电线路,T接输电线路故障定位对于电力系统安全运行有着重要意义,但是传统的阻抗法与行波法两种故障测距技术应用于T接输电线路时各有不足。因此依照先实现故障支路判别、再实现故障点的精确定位的思路,研究了T接输电线路三端电流相位差动原理、故障支路判别方法和故障点精确定位方法,实现了T接输电线路故障的精确定位。

With the development of electric power system and the growth of the load density,more and more T-connected（three terminal） transmission lines has appeared in high voltage powergrid.Fault location of T-connected transmission line is important for the safe operation of power sys-tem, but the traditional impedance method andtravelling wave location method used for fault location have shortcomings when applied in fault location of T-connected transmission line. In this pa-per, first the fault branch is identified, then the fault pointis precisely located. Based on this method, the principle of three-terminal current phase difference of T-connected transmission line, method of fault branch identification method and fault location positioning method are investigated inthis paper, and the fault location of T-connected transmission line is realized.