Intelligent electronic device and method thereof
First Claim
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1. An intelligent electronic device comprising:
- a metering module configured to receive at least one alternating current (AC) voltage waveform and/or AC current waveform from an AC electrical service, the at least one AC voltage waveform and/or AC current waveform including a plurality of cycles occurring sequentially, each cycle of the plurality of cycles including two half-cycles, the metering module further configured to obtain waveform samples from the at least one AC voltage waveform and/or AC current waveform;
a memory module configured to store the waveform samples obtained by the metering module; and
a processing module configured to process the waveform samples stored in the memory module at each half-cycle;
wherein the processing module performs pipeline processing for each half-cycle to evaluate the stored waveform samples corresponding in operating times based on a trigger condition occurring a predefined number of half-cycles before an evaluation point in the at least one AC voltage waveform and/or AC current waveform;
wherein the processing module defers checking for the trigger condition until a predefined number of samples to be evaluated has been obtained by the metering module and stored in the memory module; and
wherein the processing module captures a block of waveform samples based on the trigger condition and stores the captured block of waveform samples in the memory module.
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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.
353 Citations
37 Claims
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1. An intelligent electronic device comprising:
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a metering module configured to receive at least one alternating current (AC) voltage waveform and/or AC current waveform from an AC electrical service, the at least one AC voltage waveform and/or AC current waveform including a plurality of cycles occurring sequentially, each cycle of the plurality of cycles including two half-cycles, the metering module further configured to obtain waveform samples from the at least one AC voltage waveform and/or AC current waveform; a memory module configured to store the waveform samples obtained by the metering module; and a processing module configured to process the waveform samples stored in the memory module at each half-cycle; wherein the processing module performs pipeline processing for each half-cycle to evaluate the stored waveform samples corresponding in operating times based on a trigger condition occurring a predefined number of half-cycles before an evaluation point in the at least one AC voltage waveform and/or AC current waveform; wherein the processing module defers checking for the trigger condition until a predefined number of samples to be evaluated has been obtained by the metering module and stored in the memory module; and wherein the processing module captures a block of waveform samples based on the trigger condition and stores the captured block of waveform samples in the memory module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An intelligent electronic device comprising:
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a metering module coupled to an alternating current (AC) electrical distribution system for obtaining waveform samples from an AC waveform to be evaluated, the AC waveform including a plurality of cycle occurring sequentially, each cycle of the plurality of cycles including two half-cycles; a buffer module configured to store the waveform samples obtained by the metering module; and a processing module configured to process the waveform samples at each half-cycle; wherein the processing module is configured to evaluate the stored waveform samples corresponding in operating times based on a trigger condition occurring a predefined number of half-cycles before an evaluation point in the AC waveform. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An intelligent electronic device comprising:
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a metering module configured to receive an AC waveform from an electrical distribution service and obtain waveform samples from the AC waveform, wherein the AC waveform includes a plurality of cycles occurring sequentially, each cycle of the plurality of cycles including two half-cycles; a processing module configured to calculate RMS values from the waveform samples at each half-cycle; and a memory module configured to store the waveform samples obtained by the metering module and the RMS values calculated by the processing module; wherein the processing module is further configured to defer checking for a trigger condition corresponding in operating times until a predefined number of waveform samples to be evaluated has been obtained by the metering module and stored in the memory module; and wherein the processing module captures a block of waveform samples based on the trigger condition and stores the captured block of waveform samples in the memory module. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification