Analysis of Power System Faults by Phase Impedance matrix Method: II-Simultaneous Unbalances and Transient Analysis

Analysis of simultaneous unbalances and transient recovery voltages of power system has been undertaken in this paper. The approach is similar to the one developed in Part I of this paper. The method requires only the assembly of the nodal admittance or impedance matrices of various elements of a power system and subsequent solution of sets of linear algebraic equations subjected to constraints. The transient analysis of a power system having untransposed transmission lines can be carried out by the application of modified Foruier transform and the steady state theory of natural modes. Finally a digital computer can be programmed to calculate the magnitudes of the fault currents and active recovery voltages.