【摘要】 提出了一种基于同杆双回线单端电流量的故障测距方法。在故障状态下,双回线可以分解成同向网和环流网,其中环流网只与双回线有关,且两端电压为零。根据双回线环流网的特点,只需电流量就可求取环流网中的电压分布。因为双回线环流网中的行波具有两端母线处反射强、故障点反射弱的特点,所以可以根据环流网中行波首次到达测点的时刻为起点,由前行波和反行波电压的最强叠加点所处的时刻和位置进行故障定位。仿真验证表明该方法定位精度高,不受过渡电阻影响。更多还原

【Abstract】 The method for fault location of the parallel transmission lines on the same tower based on single-terminal current is proposed in this paper. In the fault state, parallel transmission lines could be decomposed into same directional component nets and circumfluence component nets, of which the latter have no relation to systems outside the double-circuit lines and their voltage at two terminals are zero. According to the feature of parallel transmission lines′ circumfluence component nets, voltage profile along circumfluence component nets can be calculated by one-terminal current only. Because the travelling wave in parallel transmission line′s circumfluence component nets have strong reflection at two-terminal buses, and weak reflection at fault points, the fault location can be achieved by finding the strongest overlapped point of forward and backward travelling wave, if the moment when the first travelling wave arrived at measuring point can be regarded as the originating point. Simulations show that the proposed fault location method has a satisfactory precision and are free from the influence of transition resistance. This project is supported by National Natural Science Foundation of China (No.50377032).更多还原