| 摘要 |
The present invention pertains to a device and method for determining the sign of a phase angle of a first and second, essentially identical, periodic electric signals on corresponding first and second electrical conductors L1, L2, in particular, to determine the phase sequence in a three-phase power system. The device according to the present invention has a sensing device for sensing of the first signal from the first conductor L1 and of the second signal from the second conductor L2; a trigger device 25 for receiving the sensed first signal and specifying a time reference point and/or a time reference window within the signal period of the first signal and outputting a corresponding trigger signal; and a determination device 31, 32, 33 for receiving the trigger signal and the sensed second signal and determining the sign of the phase angle under consideration of at least the value of the second signal at the time reference point and/or the waveform of the second signal within the time reference window.
|
