System checking and troubleshooting package for an electronic metering device
First Claim
Patent Images
1. In a solid state electronic meter including means for ascertaining current and voltage information from a multi-phase electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
- (a) a microprocessor;
(b) a storage memory;
(c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, one of said predefined multi-phase electrical system diagnostic tests being a polarity, cross-phase and energy flow check, and wherein said first logic includes logic for designating a base phasor, and determining the phase angle θ
for each of the phasors in said multi-phase electrical system relative to the base phasor; and
(d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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Abstract
An integral electronic meter system diagnostics package including a microprocessor, storage memory, logic for automatically and periodically performing a pre-select series of system diagnostic tests, and recording any results which exceed predefined programmable thresholds, and display means for displaying error and/or diagnostic messages identifying selected diagnostic data and/or errors discovered in the meter tests during a predefined period.
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Citations
11 Claims
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1. In a solid state electronic meter including means for ascertaining current and voltage information from a multi-phase electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, one of said predefined multi-phase electrical system diagnostic tests being a polarity, cross-phase and energy flow check, and wherein said first logic includes logic for designating a base phasor, and determining the phase angle θ
for each of the phasors in said multi-phase electrical system relative to the base phasor; and(d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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2. In a solid state electronic meter including means for ascertaining current and voltage information from a multi-phase electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, one of said predefined multi-phase electrical system diagnostic tests being a polarity, cross-phase and energy flow check, and wherein said first logic includes logic for calculating for each phase a voltage phasor, a current phasor, and a phase angle for each voltage phasor and each current phasor relative to a selected base phasor; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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3. In a solid state electronic meter including means for ascertaining current and voltage information from a multi-phase electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, said first logic including logic for calculating for each phase a voltage, a current, and a phase angle for each voltage and each current for each phase relative to a preselected base phasor; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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4. In a solid state electronic meter including means for ascertaining current and voltage information from a multi-phase electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, said first logic including logic for determining the phase angle of at least one phasor relative to a selected base phasor, including storing accumulated digital values corresponding to the instantaneous voltage measured for the base phasor, XB, storing accumulated digital values corresponding to the instantaneous value measured for another selected phasor, XN determining, for a predefined period, the RMS values for XB and XN, denoted XB(RMS) and XN(RMS) respectively, determining the product, P, of XB(RMS) and XN(RMS), determining the average value, Q, of the product of the two sine waves corresponding to XB and XN and determining the average value, Y, of the product of the two sine waves corresponding to a shifted version of XB, denoted XB(-90) ; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period. - View Dependent Claims (5, 6)
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7. In a solid state electronic meter including means for ascertaining current and voltage information from an electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, said preselected set of multi-phase electrical system diagnostic tests including a phase voltage deviation check, and wherein said first logic includes logic for periodically measuring the voltage for each phase in said electrical system and comparing it to a predefined voltage envelope; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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8. In a solid state electronic meter including means for ascertaining current and voltage information from an electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, said preselected set of multi-phase electrical system diagnostic tests including a current transformer check, and wherein said first logic includes logic for periodically measuring the instantaneous RMS current for each phase and comparing it to a predefined current value; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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9. In a solid state electronic meter including means for ascertaining current and voltage information from an electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom, said preselected set of multi-phase electrical system diagnostic tests including a per-phase power factor check, and wherein said first logic includes logic for periodically calculating the angle between the current phasor and the idealized voltage phasor, and comparing the angle to a predefined envelope; and (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period.
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10. In a solid state electronic meter including means for ascertaining current and voltage information from an electrical system metered thereby, a meter self-checking and electrical system diagnostic device, said device including:
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(a) a microprocessor; (b) a storage memory; (c) first logic for periodically performing a preselected set of diagnostic tests on said multi-phase electrical system and recording any errors detected therefrom; (d) display means for displaying the error messages identifying any errors discovered in said multi-phase electrical system diagnostic tests performed during a predefined period; and (e) display means for displaying a diagnostic toolbox in response to an activation signal, said diagnostic toolbox comprising a fixed selected set of display items including selected information developed from said multi-phase electrical system diagnostic tests. - View Dependent Claims (11)
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Specification