Patent ID: 8620608
Filing Date: 2013-12-31
Classification: G01D,G01R,Y02B,Y04S

Abstract:
1. An intelligent electronic device, comprising: a metering module that measures at least one parameter of an AC electrical service; and a processing module that processes the at least one parameter obtained using the metering module; wherein the metering module samples supply voltages or supply currents of the AC electrical service at frequency-locked points to obtain frequency-locked samples, the frequency-locked points relating to zero-crossing points of the supply voltages or supply currents of the AC electrical service, the frequency-locked samples being obtained a predetermined number of times per cycle; and wherein the metering module samples the supply voltages or supply currents of the AC electrical service at time-locked points to obtain time-locked samples, the time-locked points being independent of the frequency-locked points and corresponding to predetermined moments of time during a predetermined time interval.