Electrical utility meter with event-triggered window for highest demands logging
First Claim
1. An electric utility meter comprising at least one sensor circuit for measuring voltage and current and generating voltage and current measurement signals therefrom, a conversion circuit connected to the sensor circuit and operable to receive the voltage and current measurement signals and generate power consumption signals therefrom, a memory location containing a list of highest demands, and a controller operable to:
- (a) generate a demand value corresponding to a quantity of energy consumed within a demand interval based on the power consumption signals;
(b) determine whether the demand value for the demand interval is greater than a smallest demand value on the list of highest demands in the memory location;
(c) open a demand window if the demand value is greater than the smallest demand value, the demand window having a duration exceeding the demand interval;
(d) obtain a plurality of additional demand values for the duration of the demand window, each of said additional demand values corresponding to one of a plurality of additional demand intervals within the demand window; and
(e) record in the list of highest demands in the memory location a select demand value comprising one of the demand value and the plurality of additional demand values.
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Accused Products
Abstract
An electrical utility meter includes a controller that determines a list of highest demands using event-triggered windows of time to ensure that only one of the entries on the list corresponds to any one high consumption event. The controller generates a demand value corresponding to the quantity of energy consumed within a demand interval, and then determines whether the demand value for the demand interval is greater than a smallest demand value on a list of highest demands in a memory location. If so, the controller opens a demand window, the demand window having a duration exceeding the demand interval. The controller then obtains a plurality of additional demand values for the duration of the demand window, each of the additional demand values corresponding to one of a plurality of additional demand intervals within the demand window. The controller records in the list of highest demands in the memory location a select one of the demand value and plurality of additional demand values. The select demand value may suitably be the largest demand in the window.
38 Citations
17 Claims
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1. An electric utility meter comprising at least one sensor circuit for measuring voltage and current and generating voltage and current measurement signals therefrom, a conversion circuit connected to the sensor circuit and operable to receive the voltage and current measurement signals and generate power consumption signals therefrom, a memory location containing a list of highest demands, and a controller operable to:
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(a) generate a demand value corresponding to a quantity of energy consumed within a demand interval based on the power consumption signals; (b) determine whether the demand value for the demand interval is greater than a smallest demand value on the list of highest demands in the memory location; (c) open a demand window if the demand value is greater than the smallest demand value, the demand window having a duration exceeding the demand interval; (d) obtain a plurality of additional demand values for the duration of the demand window, each of said additional demand values corresponding to one of a plurality of additional demand intervals within the demand window; and (e) record in the list of highest demands in the memory location a select demand value comprising one of the demand value and the plurality of additional demand values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric utility meter comprising at least one sensor circuit for measuring voltage and current and generating voltage and current measurement signals therefrom, a processor connected to the sensor circuit and operable to receive the voltage and current measurement signals and generate power consumption signals therefrom, a memory location, and a controller operable to:
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(a) generate a present demand value based on the power consumption signals received from the sensor circuit within a demand interval; (b) determine whether the present demand value is greater than a smallest demand value on a highest demand list; (c) open a demand window having a variable duration if the present demand value is greater than the smallest demand value, the variable duration exceeding a minimum duration; (d) generate subsequent present demand values for subsequent demand intervals; (e) determine a window demand value based on the present demand value and subsequent demand values; and (f) record in the memory location the window demand value.
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10. In an electric utility meter comprising at least one sensor circuit for measuring voltage and current and generating voltage and current measurement signals therefrom, a conversion circuit connected to the sensor circuit and operable to receive the voltage and current measurement signals and generate power consumption signals therefrom, a memory location containing a list of highest demands, and a controller, a method of updating a list of highest demands, the method comprising:
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(a) generating a demand value corresponding to a quantity of energy consumed within a demand interval based on the power consumption signals; (b) determining whether the demand value for the demand interval is greater than a smallest demand value on the list of highest demands in the memory location; (c) opening a demand window if the demand value is greater than the smallest demand value, the demand window having a duration exceeding the demand interval; (d) obtaining a plurality of additional demand values for the duration of the demand window, each of said additional demand values corresponding to one of a plurality of additional demand intervals within the demand window; and (e) recording in the list of highest demands in the memory location a select demand value comprising one of the demand value and the plurality of additional demand values. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification