一种新的六相输电系统故障分析方法

摘要

For a completely transposed system,a new fault analysis method for six-phase transmission system is pro⁃posed. In this method,the six phases are divided into two groups,and symmetry component method is used directly for the two groups. By decoupling the coupled components of the two groups,six independent sequence components are formed. The composition for each sequence network and six-sequence current angles for different phases based on trans⁃formation are given. The establishment method for complex sequence network with various faults is discussed. Simula⁃tion results show that the new fault analysis method is correct and effective,and it can easily determine whether the in⁃ter-line fault occurs. It is conducive to the realization of fault phase selection and relay protection .%针对循环换位的六相系统特点，提出了一种新的六相故障分析方法。该方法首先将六相系统分成两组，直接进行对称分量变换；对变换后相互耦合的序量再进行解耦，进而形成相互独立的六个序分量。文中给出了各序网络的构成方式和同一序中各相电流电压之间的相位关系；给出了复合序网的制订方法。仿真计算结果表明，这种新的故障分析方法是正确有效的，能方便地判断出是否发生了跨线故障，有利于故障选相和继电保护的实现。