A TIME-STEPPED FINITE-ELEMENT SIMULATION OF A SYMMETRICAL SHORT-CIRCUIT IN A SYNCHRONOUS MACHINE

The aim of this work is to propose and apply the principle of superpos ition for the numerical simulation of a symmetrical short-circuit in a n unloaded synchronous machine. For this purpose a linear, two-dimensi onal, time-stepped Finite-Element Method coupled with electric circuit s is used which permits to take into account the rotor movement and th e end-winding impedances. Computed values of subtransient, transient a nd steady-state reactances, as well as, subtransient and transient tim e-constants on D-axis are compared with those obtained by the short-ci rcuit test and the Standstill Frequency Response (SSFR) test simulatio n.