基于分布参数线路模型的精确故障测距算法

为消除负荷电流和线路模型不准确给双端量故障测距带来的影响,提出一种基于分布参数线路模型的精确测距算法。算法以均匀传输线的波动方程(长线方程)为基础,利用线路两端电压、电流的正序故障分量以及线路正序参数直接计算故障距离。算法无需故障类型判别,不受系统阻抗、故障电阻、负荷电流以及分布电容的影响。基于EMTP的数字仿真结果验证了该算法的正确性和高精度。

An accurate fault location algorithm based on distributed parameter line model

To remove the effect on two-terminal fault location by load current and imperfect line model, an accurate fault location algorithm based on distributed parameter line model is proposed in this paper. Basing on the wave equation of homogeneous transmission line, the fault location is directly calculated by using positive sequence fault components of voltages and currents derived at both line ends, as well as line positive sequence parameters. The algorithm does not need fault type identification, and its accuracy is not affected by fault resistance, system impedance , pre-fault load current and shunt capacitance. The EMTP based digital simulation has shown its correctness and high accuracy.