Patent ID: 7480580

Claim:
An apparatus for estimating a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system, the apparatus comprising: a sample controller configured to determine a frequency of a power system signal acquired at a location of the electrical power system; a sampling means configured to sample the electrical power system signal at a sampling interval rate based on the frequency of the power system signal to form a plurality of signal samples; a time controller configured to generate a plurality of acquisition time values based on an occurrence of each of the plurality signal samples at a corresponding plurality of sample times referenced to the absolute time standard, each of the plurality of acquisition time values associated with a phasor magnitude and a phasor phase angle of each of the plurality of signal samples; and a phasor estimator configured to adjust the phasor magnitude and the phasor phase angle for each of the plurality of signal samples based on a time difference between a corresponding selected acquisition time value of the plurality of acquisition time values and a predetermined time of the predetermined times referenced to the absolute time standard to form the plurality of synchronized phasors.