Generator Pole Slip Protection with Auxiliary Winding Measurement

Abstract

The present invention pertains to a method for detecting an onset of a pole slip in a generator as well as a corresponding control unit and generator, in particular to predict a pole slip prior to an actual occurrence of a pole slip in order to enable required safety measures. Accordingly, a method for detecting an onset of a pole slip in a generator is suggested, comprising the steps of detecting subsequent zero cross points from a voltage measurement received from said generator and determining a voltage phase by interpolating said zero cross points. The voltage measurement is received from an auxiliary winding of the rotor that is electrically isolated from the main windings of the rotor, wherein a relative rotor angle is determined based on the determined voltage phase of the auxiliary winding and a relative voltage phase change of the main windings. A signal is output, when a relative rotor angle change is determined that exceeds a predefined angle change threshold.

Dependencies are inferred from the claim text.