同杆双回线断相故障计算的解耦相分量法

A DECOUPLING PHASE DOMAIN METHOD TO CALCULATE OPEN CONDUCTOR FAULTS IN THE DOUBLE CIRCUIT LINE ON THE SAME POLE

按照仅保留双回线的原则选取同杆双回线首末节点作为边界节点,在相坐标下将同杆双回线进行解耦处理,建立同杆双回线的解耦等值电路。避免了直接在相坐标下进行计算时各相之间的耦合,根据简单的电路理论即可分析复杂的同杆双回线完全或者非完全断相故障。此方法避免了同杆双回线断相故障计算中复杂的序网连接,可以方便、精确地模拟同杆双回线断相故障,且方便计及非完全断相时的断相口故障阻抗。算例表明该方法是分析计算同杆双回线断相故障的一种十分有效的方法。

A decoupling phase domain method is given for calculating open conductor faults of the double circuit line on the same pole. In the phase domain, the double circuit line is decoupled in terms of only remaining fault lines while the two terminal nodes of the double circuit line are selected as boundary nodes. The proposed algorithm is easy to understand and unified by use of the simple circuit theory to treat the complicated open conductor faults of the double circuit line. It has many advantages such as: (1) the complex connections between sequence networks are avoided in fault calculations; (2) the open conductor faults can be modeled accurately; and (3) the influence of the fault impedance in incomplete open conductor fault can be modeled simply. The numerical example shows that the method is very effective.