| 主权项 |
1. A method of determining a rotor displacement angle of a synchronous generator having a rotor and electrically connected to a power supply network, wherein there is provided at least one rotary speed measuring device which during a revolution of the rotor, in particular during each revolution of the rotor, communicates at least one rotary speed signal to an evaluation unit, wherein there is provided a frequency measuring device which communicates a frequency signal to the evaluation unit for each period duration of a voltage signal of the power supply network, wherein a time duration between communication of the rotary speed signal and communication of the frequency signal is determined by the evaluation unit, wherein the rotor displacement angle is inferred in dependence on the determined time duration, wherein for calibration of the method the determined time duration is stored after synchronisation of the synchronous generator with the power supply network has been effected and substantially without load application to the synchronous generator as a no-load time duration in the evaluation unit, wherein to determine the rotor displacement angle a differential time is formed from the determined time duration less the no-load time duration, wherein the rotor displacement angle is inferred in dependence on the differential time. |
