Siemens SICAM Q100 Device Manual page 82

5 Energy Management
5.1 Load-Profile Determination
Rolling Block Method
A measuring period of the Rolling Block method consists of 2 to 5 subperiods depending on the parameter-
ization.
The length of a measuring period is the product of the number of subperiods and the parameterized length of
the subperiod; see parameterization in chapter 8.3.5.1.
The following figure shows the history of the measuring periods during the load-profile determination:
Measuring
period
5
4
3
2
1
0
Start
Figure 5-3
Load-Profile Data at the Communication Interface
The following load-profile data are available during a measuring period:
• Average power values for all power quantities during the measuring period, calculated from the average
power values at the end of every subperiod (red dots in Figure 5-3)
• Average power values for all power quantities during the subperiods (blue dots in Figure 5-3)
• Maximum and minimum values for all power quantities within the subperiods
• Cumulated power values for all power quantities at every sampling point within the current subperiod
The arithmetic average power values and the extreme values per subperiod are stored in the ring buffer. The
cumulated power values can be retrieved via communication or displayed in the user interface.
82
Example:
A measuring period consists of
3 subperiods (SP) with a
duration of 15 min each.
SP
SP SP
SP SP SP
15 30
History of the measuring periods for determination of the load profile according to the Rolling
Block method
SP
SP SP
SP SP
SP
Calculation/recording of the load
profile data from the 3 subperiods of
the ended measuring period
Recording load profile data of
the ended subperiod
45 75
60
SP SP
SP
t [min]
105
90
SICAM Q100, 7KG95xx, Device Manual
E50417-H1040-C522-A4, Edition 03.2018