A new approach to synchronous generator internal fault simulation using combined winding function theory and direct phase quantities

In this paper, a new method which combines the direct phase quantifies approach with the winding function theory is described. With this approach, the problem of effectively modeling the asymmetries in the stator and rotor with the concomitant effects of space harmonics is overcome. The paper also gives details of machine models under normal conditions and under various fault conditions, namely single phase to ground, double phase to ground and three phase to ground faults at different fault locations. Some typical waveforms are presented with respect to a 6 MVA, 6.6 kV synchronous generator