T型接线的一种新型精确故障定位算法的研究

传统的采用单端信号的输电线故障定位系统，由于在原理上无法克服对侧系统的助增电流和过渡阻抗对定位精度的影响，因此很难应用到Ｔ型线路进行精确故障定位。介绍了一种Ｔ型线路的新型故障定位算法。首先，判断故障支路，然后由三端的电流、电压量计算得到Ｔ点的电流、电压量，这样就能得到故障支路两侧的电流、电压值，最后再采用故障支路两侧的信号进行精确故障定位。采用电力系统电磁暂态计算程序（ＥＭＴＰ）仿真的结果表明，本算法是一种高精度高效率的方法。

THE STUDY ON A NEW ACCURATE FAULT LOCATION ALGORITHM FOR TEED TRANSMISSION LINE USING THREE-TERMINAL SIGNALS

The traditional fault location algorithms using one-terminal currents and voltages can not be used for teed feeder.A new fault location system using three-terminal currents and voltages is presented in the paper, which can remove the error caused by fault resistance. First, the fault branch is identified, and then the currents and voltages of tee point can be calculated from three-terminal signals. Finally, we can get the location result by using the algorithm, which is presented in the reference . A large number of numerical simulation results show that the new method is accruate and effective.