Electric meter with electronic rolling demand register
DCFirst Claim
1. An electronic demand register for an electric meter comprising:
- means for defining a demand subinterval;
means for defining a demand interval equal to an integral number N of said demand subintervals;
means for summing a power usage data during each demand subinterval with a sum of demand data from N-1 prior demand subintervals to derive a rolling interval demand;
means for storing a maxium demand;
means for comparing said rolling interval demand with said maximum demand; and
means for replacing said maximum demand with said rolling interval demand if said rolling interval demand exceeds said maximum demand whereby said means for storing a maximum demand remains updated with a maximum rolling interval demand in any preceding demand interval.
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Abstract
An electronic demand register divides a demand interval into a contiguous set of N demand subintervals. The demand in each demand subinterval is summed with the demands from the N-1 most recent contiguous demand subintervals to derive the interval demand. The interval demand is compared with a prior stored maximum demand to decide whether to discard the present interval demand or to use it to replace the previously recorded maximum demand. Demand is accumulated in terms of actual power usage by scaling power usage pulses according to the relationship in the particular meter on which the rolling demand register is used. Thresholds are provided for producing warning signals to alert the consumer to an actual or impending demand condition which may adversely affect billing.
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Citations
9 Claims
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1. An electronic demand register for an electric meter comprising:
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means for defining a demand subinterval; means for defining a demand interval equal to an integral number N of said demand subintervals; means for summing a power usage data during each demand subinterval with a sum of demand data from N-1 prior demand subintervals to derive a rolling interval demand; means for storing a maxium demand; means for comparing said rolling interval demand with said maximum demand; and means for replacing said maximum demand with said rolling interval demand if said rolling interval demand exceeds said maximum demand whereby said means for storing a maximum demand remains updated with a maximum rolling interval demand in any preceding demand interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for registering for an electric meter comprising:
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defining a demand subinterval; defining a demand interval equal to an integral number N of said demand subintervals; summing a power usage data during each demand subinterval with a sum of demand data from N-1 prior demand subintervals to derive a rolling interval demand; storing a maximum demand; comparing said rolling interval demand with said maximum demand; and replacing said maximum demand with said rolling interval demand if said rolling interval demand exceeds said maximum demand whereby said maximum demand remains updated with a maximum rolling interval demand in any preceding demand interval.
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Specification