Distribution Circuit Multiple Failures Analysis for Asymmetric System

Short-circuit current calculation acts an important role in selecting the electrical facility, carrying conductor, determining the method to restrict short-circuit current and setting the values of relay protection device in the power system network construction. A powerful basis for electrical facility selection is proposed by fast and accurate short-circuit current calculation. Thus, current research focus on how to fully consider various complex conditions in distribution network, short-circuit current calculation. A new kind of short-circuit current calculation model are quoted in this paper, asymmetric network complex fault calculation by a model using virtual nodes and lines which is equivalent to a three-phase distribution system, can be used to intuitive analysis the complex asymmetric network fault. The comparison between the new algorithm and traditional algorithm with efficiency and reliability in various fault condition is given in this paper, provide the basis for choice short-circuit current calculation method to different network model, the basis for choice short-circuit current calculation method is provided to different network model.