Sliding mode
In the sliding mode the demand period is divided into between 1 and 15 fixed integration periods. The total
maximum duration of a sliding demand period is 15 (maximum periods) x 60 (maximum minutes) = 900 minutes.
The illustration below shows a sliding mode demand period comprising 4 integration periods with, for example a
duration of T = 5 minutes. The sliding demand period total duration = 20 minutes with the rising demand value
based on a constant load:
1 Rising value
2 Integration periods
3 First sliding period
3a Second sliding period
3b Third sliding period
3c Forth sliding period
4 Actual demand value
5 Elapsed time
At the end of each completed integration period (T) the demand value is calculated and temporarily stored.
At the end of the first sliding period (3), an average demand value based on the results from all integration
periods within that sliding period (T1,T2,T3,T4), is calculated.
When the next integration period (T5) ends, a new average demand value based on the results of integration
periods (T2,T3,T4,T5), is calculated.
This process is then repeated at the end of every successive integration period until an end of billing event
occurs.
6.9.4.4. Demand calculation
At the end of each integration period (EOI), the meter calculates the following:
• average demand over the integration period
• average three-phase power factor over the integration period
• minimum power factor - the meter records the lowest values in the current billing period
• average power factor over the current billing period
• maximum demand - the meter records the 5 highest peaks in the current billing period
The threshold comparison for excess demand detection and the EOI time stamping is also carried out.
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