计及TA传变特性的输电线路行波故障定位研究

Study on Traveling Wave Fault Location Reckoning with Transfer Characterastic of TA

研究了电流互感器非理想传变特性引起的行波信号畸变和对行波故障定位的影响。建立了电流互感器的高频电路模型,并由实验确定了电路模型参数,然后根据该模型对二次侧的畸变电流进行校正以逼近一次侧电流,从而减小由电流互感器非理想传变特性引入的误差。数字仿真和实验结果表明,该方法可有效地校正电流互感器引起的行波信号畸变和误差,提高行波故障定位的精度。

The nonideal transfer characteristic of TA is taken into account for traveling wave fault location. The distortion of traveling wave, which is induced by TA characteristic, and its influence on traveling wave fault location are studied. Firstly, a high frequency circuit model for TA is constructed, and the model parameters are figured out through experiments. Secondly, a special recursive algorism is presented to deduce the primary current from the distorted secondary current and the model. In the last step, the deduced primary current is used for traveling wave fault location. Digital simulations and experiments show that the distorted traveling wave, which is induced by nonideal transfer characteristic of TA, can be precisely corrected, and the involved fault location error can be greatly reduced.