Averaging in an intelligent electronic device
First Claim
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1. An intelligent electronic device comprising:
- a metering module that obtains values of a parameter of an alternating current (AC) electrical service over a predetermined number of AC cycles of an AC signal delivered by the AC electrical service; and
a processing module that processes the values obtained by the metering module, the processing module operative to average a plurality of the values of the parameter over the predetermined number of AC cycles,wherein the processing module determines the average by determining a plurality of sets of values of the parameter, each set of values comprising values of the parameter obtained at temporally similar points in each of the plurality of AC cycles and calculating the average value of the parameter for each of the plurality of sets of values.
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Abstract
A method and apparatus measures electrical power usage and quality, while mitigating the effects of noise on measured signals or parameters. Specifically, a digital electrical power and energy meter employs a method in which a processor averages a parameter, such as voltage or current, over a plurality of cycles of a time-varying signal, such as an AC electrical signal. The method employed by the meter samples a parameter over the plurality of cycles and computes the average of the samples corresponding to the same phase angle of the signal to produce an average signal.
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Citations
21 Claims
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1. An intelligent electronic device comprising:
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a metering module that obtains values of a parameter of an alternating current (AC) electrical service over a predetermined number of AC cycles of an AC signal delivered by the AC electrical service; and a processing module that processes the values obtained by the metering module, the processing module operative to average a plurality of the values of the parameter over the predetermined number of AC cycles, wherein the processing module determines the average by determining a plurality of sets of values of the parameter, each set of values comprising values of the parameter obtained at temporally similar points in each of the plurality of AC cycles and calculating the average value of the parameter for each of the plurality of sets of values. - View Dependent Claims (2, 3, 4, 5)
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6. An intelligent electronic device comprising:
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a metering module that determines values for one or more parameters of an alternating current (AC) electrical service; and a processing module that processes the values for the one or more parameters obtained using the metering module, wherein the processing module averages a plurality of the values of at least one of the one or more parameters, each of the plurality of values obtained at a same phase angle within each of a pre-determined number of AC cycles. - View Dependent Claims (7, 8, 9, 10)
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11. A method of determining an instantaneous value of a parameter of an alternating current (AC) electrical service which provides an AC signal, wherein the parameter has a noise component, the method comprising:
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sensing a plurality of values of the parameter using a metering module of a digital electrical power and energy meter, each of the plurality of values of the parameter obtained at the same phase angle within each of a pre-determined number of AC cycles of the AC signal; calculating an average value of the plurality of values; and using the average value of the plurality of values as the instantaneous value of the parameter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of determining a value of a parameter of an alternating current (AC) electrical service which provides an AC signal, wherein the parameter has a noise component, the method comprising:
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sensing the AC signal to produce a plurality of values of the parameter in each of a plurality of AC cycles of the AC signal; and determining an average value of the parameter over the plurality of AC cycles by determining a plurality of sets of values of the parameter, each set of values comprising values of the parameter obtained at temporally similar points in each of the plurality of AC cycles; and calculating an average value of the parameter for each of the plurality of sets of values. - View Dependent Claims (18, 19, 20, 21)
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Specification