基于非同步电压的T型输电线路故障定位新方法

Novel fault location method for T-terminal lines based on unsynchronized voltage phasor

针对T型输电线路,提出了一种利用非同步电压相量进行故障定位的新方法。该方法首先运用对称分量法和线性叠加原理建立了故障后的附加正序网络,并且定义了故障点的搜索指标。进而基于该指标运用遍历搜索方法寻找故障点的位置。该算法仅利用电压幅值进行计算,因而避免了由电流互感器饱和所带来的误差影响,且无需电压同步。基于PSCAD的仿真实验表明该方法能够有效地定位T结构线路的短路故障,并且不受故障类型、过渡电阻等因素的影响。

Aiming at the T-terminal transmission lines, a novel fault location method using unsynchronized voltage phasor was presented. On the basis of symmetrical component method and linear superposition principle, the additional positive sequence network was established and the matching index on fault point was proposed. Then with this index the fault can be located by traversing searching method. By only using synchronized voltage phasor, the fault location accuracy of this method was not affected by the saturation of current transformer, and without synchronization. The simulations were carried out based on PSCAD. The result shows that the proposed technique can locate short-fauh point on T-terminal transmission lines accurately and adaptively, with no influence from factors, such as fault resistance, fault type and so on.