Patent ID: 6130531
Filing Date: 2000-10-10
Classification: G01R

Abstract:
A method of measuring phase-angle in electric power systems, comprising the steps of:a) at a reference station, measuring the relation between the phase of a reference signal and a standard time-base by determining the phase of a reference signal .phi..sub.0 at a series of given times with regular intervals;b) sending said phase .phi..sub.0 of the reference signal to each substation by communication;c) at a substation, measuring the relation between the phase of a tested signal and the standard time-base by determining the phase of the tested signal .phi..sub.m at the same given times with regular intervals as to the reference signal;d) at the substation, receiving said .phi..sub.0 of the reference signal; ande) at the substation, in accordance with said .phi..sub.0 received and .phi..sub.m stored, calculating the phase difference .alpha. between the tested signal and the reference signal.