SYNCHRONIZED SAMPLING AND PHASOR MEASUREMENTS FOR RELAYING AND CONTROL

This paper describes the concept of utilizing time synchronized sampli ng over an entire power system to simultaneously obtain the phasor val ues of voltages and currents at particular instants of time. Uses of t he phasors are reviewed and the necessary accuracy of synchronization for several applications is established for magnitude and angle of the phasors. Various methods of providing synchronizing signals are exami ned, and a possible format for transmitting the phasor measurements to remote locations is described. Finally, some possibilities for applic ations of this technique in protection and control tasks of the future are explored.