Intelligent electronic device and method thereof
AssigneeElectro Industries/Gauge Tech
InventorsTibor Banhegyesi, Erran Kagan, Patricia E. Banker
Life of this patent
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Abstract
An intelligent electronic device (IED) having a gain control unit adapted to selectively regulate operating ranges of output signals of a sensing circuit of the device is described. In one embodiment, the IED is a digital electric power and energy meter, which operating ranges for supply voltages and supply currents of electrical services may be adjusted to match pre-determined ranges for input signals of a data acquisition system or a data processing module of the meter.
Claims21
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.
A method of using an intelligent electronic device to measure and process at least one parameter of an AC electrical service, the method comprising the steps of:
- sampling supply voltages or supply currents of the AC electrical service at frequency-locked points using a metering module 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
- sampling the supply voltages or supply currents of the AC electrical service at time-locked points using the metering module 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.
Dependencies are inferred from the claim text.