A fault location method for T transmission line is proposed based on fault analysis, which adapts to the variable operation mode and calculates simply. It uses the voltage, current, and line positive-sequence impedance parameters of three sides of T transmission line, calculates the voltage of T node of each side respectively, and distinguishes the fault branch by comparing the voltage amplitude of T node. It achieves the precise double-terminal fault location by using the electric quantity of T node and fault branch. The new method can be applied to different branch impedance parameter and adapt to the three or two terminal operation mode. Theoretical analysis and simulation experimentation show that this method is not affected by transition resistance and can realize the accurate fault location of weak feed line side.%介绍了一种基于故障分析法的T接线故障测距方法,可适应多种运行方式,计算简单.根据T接线路的三侧电压、电流和线路正序阻抗参数,在各侧分别计算T接点电压,根据计算所得的T接点电压幅值识别出故障支路,然后利用T接点和故障支路首端电气量实现双端故障测距.新方法可以适应不同的支路参数,自动适应于线路三端运行和两端运行方式.经过理论分析和仿真试验论证上述方法不受过渡电阻影响,且能实现弱电源侧准确测距.
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