896LE008146B
Measurement functions
6.7 Measuring averaged values over an interval
The sentinel Energy trip unit calculates the average current and power values by integration
over a given time interval. These are the averaged values over an interval (demand values).
These values are useful in order to create a load profile for the receivers supplied by the
sentinel Energy circuit breaker. They must not be confused with the instantaneous averages
(Instantaneous average current, etc.).
Calculation principle
The sentinel Energy trip unit calculates a value averaged out over an interval using the
electrical variable G over a time interval T divided by this same interval T.
The time interval T designates the configurable integration interval.
There are 3 types of integration interval:
- Fixed integration interval
- Sliding integration interval
- Synchronised integration period (Sync. Bus).
Fixed integration interval
The calculation intervals are consecutive.
A new average value is calculated at the end of the interval.
The duration of interval T can be configured at between 1 and 60 minutes in increments of
1 minute.
Sliding integration interval
The calculation intervals are consecutive.
A new averaged value is produced every minute.
Sliding integration interval
t (min)
T 15 min
IEC 1284/07
Fixed integration interval
T 15 min T 15 min T 15 min
t (min)
average
= G
. d
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