双回输电线路自适应距离保护的应用研究

给出发生不同类型故障时流经故障点正、负、零序电流的权重系数,避开不同的运行方式下零序电流对双回输电线路故障测量阻抗的影响。这种方法利用故障环路的信息和保护安装处实时测量电压以及正、负、零序电流的权重系数自适应地计算出线路的故障阻抗,并能定出线路的故障距离。大量的仿真结果表明这种自适应距离保护方法能有效地解决双回输电线路距离保护的超越和拒动问题。

Application of Adaptive Distance Relay for Double Circuit Transmission Lines

Weight coefficients of positive-,negative- and zero-sequence currents flowing through the fault points under different types of faults are given in order to avoid influence of zero-sequence current on fault measurement impedance of double-circuit transmission lines under various conditions in this paper. Information of fault loop and real-time voltage in the relay and weight coefficients of currents are made use of to compute adaptively the fault impedance and fault distance can be located as well. A large number of simulation results show that the proposed adaptive distance protection can effectively prevent overstep and no-response of distance protection of double-circuit transmission lines.