Analysis of the Transient Operation of a Salient Pole Synchronous Machine During Stator and Field Internal Short Circuit Using F.E.M.

摘要

In this paper the performance of a 12-pole hydrogenerator during afield excitation and a stator inter-turn short-circuit is investigate, while the synchronous machine is connected to the 50 Hz grid. Mainly, the waveforms of all the machine currents (stator, field and damper), the electromagnetic torque and the electromagnetic field in the air-gap are derived and studied. In the inter-turn stator short-circuit analysis two different kinds of faults are considered, a short circuit between two conductors belonging to different phases and between two conductors belonging to the same phase. The calculation of the machine's variables, the waveforms of the damper currents and the electromagnetic torque oscillations are obtained more easily and more precisely by the use of FEM than by other simulation methods.