Reduced cost automatic meter reading system and method using locally communicating utility meters
First Claim
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1. A re-configurable utility meter, having a current signal and having a voltage signal, said utility meter comprising:
- a current sensor;
a voltage sensor;
a DSP coupled to said current sensor and coupled to said voltage sensor, said DSP programmable by soft keys for selection of functions, said DSP comprising;
a high pass filter for filtering noise from the current sensor signal;
a phase corrector coupled to said high pass filter, wherein said phase corrector is adapted to correct phase error in the current sensor signal;
a gain corrector coupled to said phase corrector, wherein said gain corrector is adapted to correct for gain error in the current sensor signal; and
a re-configurable power measurement block for computing real power, reactive power, or apparent power, based on said soft key selection.
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Abstract
A low cost and easy to assemble communicating utility meter provides selectable measurement, calibration, display, and communications means so as to be re-configurable based on several factors including; harmonic content of the power signal measured, LCD display alternatives, time of use measurements, bandpass filter settings, power quality measurements, PLC communications alternatives, radio frequency communications alternatives, optical communications alternatives, and hard wire communications alternatives.
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Citations
19 Claims
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1. A re-configurable utility meter, having a current signal and having a voltage signal, said utility meter comprising:
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a current sensor;
a voltage sensor;
a DSP coupled to said current sensor and coupled to said voltage sensor, said DSP programmable by soft keys for selection of functions, said DSP comprising;
a high pass filter for filtering noise from the current sensor signal;
a phase corrector coupled to said high pass filter, wherein said phase corrector is adapted to correct phase error in the current sensor signal;
a gain corrector coupled to said phase corrector, wherein said gain corrector is adapted to correct for gain error in the current sensor signal; and
a re-configurable power measurement block for computing real power, reactive power, or apparent power, based on said soft key selection. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A re-configurable utility meter, having a voltage signal and having a current signal, said utility meter comprising:
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a current sensor;
a voltage sensor;
a DSP coupled to said current sensor and coupled to said voltage sensor, said DSP programmable by soft keys for selection of functions, said DSP comprising;
a high pass filter for filtering noise from the voltage sensor signal;
a phase corrector coupled to said high pass filter, wherein said phase corrector is adapted to correct phase error in the voltage sensor signal;
a current gain corrector coupled to said phase corrector, wherein said gain corrector is adapted to correct for gain error in the voltage sensor signal; and
a re-configurable power measurement block for computing real power, reactive power, or apparent power, based on said soft key selection. - View Dependent Claims (9, 10, 11, 12)
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13. A re-configurable utility meter, having a current signal and having a voltage signal, said utility meter comprising:
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a current sensor;
a voltage sensor;
a DSP coupled to said current sensor and coupled to said voltage sensor, said DSP programmable by soft keys for selection of functions, said DSP comprising;
a current high pass filter for filtering noise from the current sensor signal;
a current phase corrector coupled to said current high pass filter, wherein said current phase corrector is adapted to correct phase error in the current sensor signal;
a current gain corrector coupled to said current phase corrector, wherein said current gain corrector is adapted to correct for gain error in the current sensor signal;
a voltage high pass filter for filtering noise from the voltage sensor signal;
a voltage phase corrector coupled to said voltage high pass filter, wherein said voltage phase corrector is adapted to correct phase error in the voltage sensor signal;
a voltage gain corrector coupled to said voltage phase corrector, wherein said voltage gain corrector is adapted to correct for gain error in the voltage sensor signal; and
a re-configurable power measurement block for computing real power, reactive power, or apparent power, based on said soft key selection. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification