THE NEW CRITERION ON INTER TURN SHORT-CIRCUIT FAULT DIAGNOSE OF STEAM TURBINE GENERATOR ROTOR WINDINGS

In this paper, the electromagnetic characteristic and the correlative variety of the electrical parameters induced after inter turn short-circuit fault on turbine generator rotor windings are analyzed. The characteristic that the exciting current is increasing, the reactive power output is decreasing relatively, is put forward. Based on the definite fault character, a method is found which uses the relative variety ratio of the exciting current before and after the fault to identify the fault. The fault criterion of rotor inter turn short-circuit on-line identification is found, which can reflect the fault serious level. Finally, the relative experiment is carried out using the dynamic analog experiment unit, and the coincidence conclusion with the theory analyses is got.