| 摘要 |
597581 Disclosed is a method of detecting electric variables of a three-phase AC network having a first, a second and a third phase. The method includes measuring respective voltage values of the first, second and third phases in relation to a neutral conductor at a first moment in time and transforming the three voltage values of the first moment in time into polar co-ordinates having a voltage amplitude and a phase angle. The method also includes repeating the measurement and transformation for at least one further moment in time, and determining the currently prevailing frequency, voltage amplitude and/or phase angle of at least one of the phases from the voltage values transformed into polar co-ordinates. |
