Operation of electronic demand register following a power outage

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Demand – excess – maximum or minimum

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364483, G01R 1164

Patent

active

045945454

ABSTRACT:
An electronic demand register performs rolling demand metering in which a demand interval is divided into N subintervals. At the end of each subinterval, the demand data from the just-completed subinterval is summed with the demand in the most-recent N-1 contiguous subintervals to derive an interval demand. In the event of a power outage, the existing value of maximum demand, and a number representing the time remaining in the subinterval interrupted by the power outage, as well as programmed constants, are stored in non-volatile memory for safekeeping during the power outage. After power is restored, the stored values are used to preset a maximum demand storage to the saved value of maximum demand and to preset a subinterval timing down counter to the value it had upon the detection of an impending power outage. A logic circuit freezes accumulation of demand data for a grace period following power restoration to avoid detection of an artificially high demand from synchronized starting loads. When the accumulation of demand data is resumed, a first partial subinterval, equal to the remainder of the interrupted subinterval, is employed for collecting demand data with the demand for the prior N-1 subintervals set to zero before beginning the collection of demand data in full subintervals. This avoids the synchronization of demand periods in other demand registers in the area affected by the power outage.

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