ITRON SL7000 - Demand Calculation; End of Integration (EOI)

User Guide SL7000 IEC7
50
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.
6.9.4.5. End of integration (EOI)
The meter can be configured so that up to five different sources can trigger an end of integration period (EOI):
 the meter real-time clock
 a time change
 an active signal on a control input
 a change of tariff rate
 a power failure
The behaviour of the meter after a power failure is configurable:
 Restart
A new integration period starts after power-up.
 Resume
The integration period interrupted by power failure is continued after power-up.
 Synchronise
The integration period is always synchronised with the next whole hour.
The following illustration shows the three modes of after power failure operation with a block integration period of
15 minutes: