一种适合于同杆4回线的故障测距方法

在对同杆4回线解耦的基础上,提出了一种适合于同杆4回线的故障测距方法.同杆4回线内部发生故障时,可以将故障分量分解为12序分量,且利用该12序分量进行故障测距.考虑到在任何故障类型下,同杆4回线内部都会存在反序分量,所以提出了基于反序环流分量的故障测距方法.当同杆4回线内部发生故障时,从线路两端计算到故障点的反序环流分量电压相等,利用该关系可以求出故障点的精确位置.由于相互独立的12序分量完全能够解决线间耦合问题,文中提出的测距算法能够精确测距,测距精度不受故障类型影响.大量ATP仿真结果表明所提出的测距算法完全适用于同杆4回线的故障测距,测距精度不受过渡电阻、系统运行方式、线路两端功角的影响.

A Fault Location Algorithm Suitable for Jointed Four Transmission Lines

Based on the decoupling of the jointed four transmission lines, a fault location algorithm is proposed. When the fault occurs in the jointed four transmission lines, the faulted phase electrical measurements can be decomposed into twelve-sequence component, which can be used to implement fault location. There is inverted sequence component under any faulted condition, the fault location method based on the inverted sequence component is proposed. When a fault occurs in the jointed four transmission lines, in the inverted sequence component networks, voltages calculated from two sides of lines are equal at the faulted point. Because twelve-sequence component method can decouple the mutual electromagnetic effect between lines, the accuracy of the fault location is high. A large number of EMTP simulations indicate that the algorithm is completely suitable for the jointed four transmission lines and the accuracy is not affected by the factors such as faulted resistance, generation mode and power angle, etc.