Volume : 2, Issue : 1, January - 2013

Analysis of Symmetrical Fault with Fault Impedance in Power System

Ravi Kumar Tiwari, Nidhi Singh, Ambarish Kumar, D Suresh Babu

Abstract :

A fault represents the structural network change equivalent caused by the addition of impedance at the place of fault. If the fault impedance is zero, the fault is referred to as the bolted fault or solid fault .The prefault bus voltages are obtained from the results of the power flow solution. In order to preserve the linearity feature of the network, loads are converted to constant admittance using the prefault bus voltages. The faulted network can be solved conveniently by the Thevenin’s method. The faulted network is reduced into a Thevenin’s equivalent circuit as viewed from the faulted bus. Applying Thevenin’s theorem, changes in the bus voltages are obtained. Bus voltages during the fault are obtained by superposition of the pre faulted bus voltages and the change in the bus voltages. The current during the fault in all anches of the network are obtained using MATLAB.