Theory of Operation Demand Metering
Sliding
Sliding (Rolling) Demand is where intervals are divided into a fixed number of subintervals.
Demand calculations are performed at the end of each subinterval instead of at the end of each
interval.
As in Block Demand, the interval length must be a factor of 60. The subinterval length must be a
factor of the interval. Figure 5-2 is an example of an interval of 30 minutes with 10-minute
subintervals. Demand is calculated every 10 minutes based upon the three previous subintervals.
Figure 5-2: Sliding Demand Interval
Peak
Peak Demand is stored as part of the billing quantities in the billing registers. It is the maximum
calculated Demand since the last Demand Reset.
Cumulative
Cumulative Demand is stored as part of the billing quantities in the billing registers. It is the sum
of the previous billing period peak Demand readings. At the time of a Demand Reset, the
maximum Demand for the most recent billing period is added to the previously accumulated total
of all maximum Demands.
Continuous Cumulative
Continuous Cumulative Demand is stored as part of the billing quantities in the billing registers.
It is the sum of the previous billing period peak Demands and the present period peak Demand.
Demand Reset
When the meter performs a Demand Reset, the meter:
• Adds the present Demand values to the Previous Demand register
• Resets the intervals back to the beginning
• Resets the Demand registers to zero (0)
Version 1.0 Theory of Operation 5-5
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