基于反序网的同杆双回线跨线故障准确测距原理

针对线间存在互感的高压同杆双回线有发生跨线故障的可能,同时不能忽略分布电容对测距结果的影响,基于分布参数模型,利用相序变换后双回线反序网络与系统参数无关的特性,提出了一种使用单端工频电气量进行跨线故障定位的算法.该测距算法在理论上不受系统阻抗及过渡电阻的影响,并且考虑了分布电容对双回线测距精度的影响,加深了对分布参数模型的同杆双回线跨线故障测距的研究,并且克服了以往双回线测距算法精度不高的缺点.该算法理论分析简单,迭代求解测距方程不存在伪根问题,电磁暂态计算程序ATP仿真结果表明,本算法测距精度达到了0.05%.

New Accurate Fault Location Algorithm for Faults Between Two Lines of Double-Circuit Transmission Line Based on Differential Network

The remarkable mutual inductance between two lines of the parallel lines in extra high voltagle power system and the shunt capacitance are necessary to be taken into account in fault location. Based on differential network, an accurate fault location algorithm for the situation between two lines of double-circuit transmission lines on the same tower is described, where post-fault voltages and currents derived from one terminal are employed in the location and the shunt capacitance is considered.The algorithm is, but independent of source impedance and fault resistance. The presented algorithm maintains high accuracy for double-circuit transmission lines and the locating equation leads to the unique solution. The simulation results indicate that the maximal error is less than 0.05% theoretically.