Digital processing and calculating AC electric energy metering system
First Claim
1. A digital processing and calculating AC electric energy metering system for measuring a parameter of an electric energy quantity occurring in an electric utility system, said metering system comprising:
- signal sample means including inputs and outputs, said inputs receiving intput voltage and current signal components of said AC electric energy quantity, said outputs producing instantaneous values of the input voltage and current signals when said signal sample means is rendered to a sampling state;
sampler timer means producing pulse signals at randomly varying intervals, said pulse signals initiating the sampling state of said signal sample means at randomly occurring sampling times;
analog to digital converter means producing binary signal representations of each of the instantaneous signal values;
calculating means computing an incremental quantity of the input signals from said binary signal representations thereof occurring at each sampling time;
accumulator means receiving each incremental quantity computed so as to store totalized values thereof, said totalized values being a time integral of the sums of each computed incremental quantity received to produce measured values of said parameter; and
output means responsive to the stored totalized values of said accumulator means to produce data output signals representing the measured parameter values.
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Abstract
A metering system for electric utility power line measurements includes voltage and current signal inputs that are randomly sampled and converted to binary representations. A system sequence controller and calculator provides programmed control for processing digital control and data signals and for producing digital calculations of electric energy parameters from the binary representations of the instantaneous signal values. Memory registers totalize and accumulate digitally calculated values for producing visual displays and output signals that correspond to electric energy parameters to be measured.
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Citations
30 Claims
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1. A digital processing and calculating AC electric energy metering system for measuring a parameter of an electric energy quantity occurring in an electric utility system, said metering system comprising:
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signal sample means including inputs and outputs, said inputs receiving intput voltage and current signal components of said AC electric energy quantity, said outputs producing instantaneous values of the input voltage and current signals when said signal sample means is rendered to a sampling state; sampler timer means producing pulse signals at randomly varying intervals, said pulse signals initiating the sampling state of said signal sample means at randomly occurring sampling times; analog to digital converter means producing binary signal representations of each of the instantaneous signal values; calculating means computing an incremental quantity of the input signals from said binary signal representations thereof occurring at each sampling time; accumulator means receiving each incremental quantity computed so as to store totalized values thereof, said totalized values being a time integral of the sums of each computed incremental quantity received to produce measured values of said parameter; and output means responsive to the stored totalized values of said accumulator means to produce data output signals representing the measured parameter values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification