双回线故障精确测距法

将M.S.Sachdcv等人提出的单回线测距法应用到具有零序互阻抗的双回线路上。它利用故障线路两端的数字式阻抗继电器所测量的电压和电流的基频分量进行测距,具有公式不迭代、精度与故障点电阻和电源阻抗无关、两端测量不必同步、以及利用阻抗继电器的计算结果简化测距计算等优点。

An Accurate Technique for Estimating Double Transmission Line Fault Location

The technique of estimationg single transmission line fault location proposed by M. S. Sachdev and R. Agarwal1] is applied to double circuit line having zero sequence couplings. It uses post fault fundamental frequency voltages and currents measured by digital impedance relay at the two line terminals. The proposed technique is non-iterative and its accuracy is not affected by fault resistances and source impedances. The measurements taken at the two terminals are not required to be synchronized. The estimation can be simplified by using the calculating results of digital impedance relay.