2.21 Auxiliary functions
355
7SA522 Manual
C53000-G1176-C155-3
2.21.4 Demand Measurement Setup
Long-term average values are calculated by 7SA522 and can be read out with the
point of time (date and time of the last update).
2.21.4.1 Long-term Average Values
The long-term average values of the three phase currents I
Lx
, the positive sequence
components I
1
for the three phase currents, and the real power P, reactive power Q,
and apparent power S are calculated within a set period of time and indicated in
primary values.
For the long-term average values mentioned above, the length of the time window for
averaging and the frequency with which it is updated can be set. The associated
minimum and maximum values can be reset, using binary inputs or by using the inte-
grated control panel in the DIGSI
®
operating program.
2.21.4.2 Setting Notes
Averages The time interval for measured value averaging is set at address '0'
,QWHUYDO. The first number specifies the averaging time window in minutes while the
second number gives the frequency of updates within the time window. 0LQ
6XEV, for example, means that time averaging occurs for all measured values that
arrive within 15 minutes. The output is updated every 15/3 = 5 minutes.
At address '0'6\QF7LPH you can determine whether the averaging time,
selected under address , begins on the hour (IXOOKRXU) or is to be synchro-
nized with another point in time (DTXDUWHUSDVW, KDOIKRXU or DTXDUWHUWR).
If the settings for averaging are changed, then the measured values stored in the
buffer are deleted, and new results for the average calculation are only available after
the set time period has passed.
2.21.4.3 Settings
Addr. Parameter Setting Options Default Setting Comments
2801 DMD Interval 15 Min., 1 Sub
15 Min., 3 Subs
15 Min.,15 Subs
30 Min., 1 Sub
60 Min., 1 Sub
60 Min., 1 Sub Demand Calculation Intervals
2802 DMD Sync.Time On The Hour
15 After Hour
30 After Hour
45 After Hour
On The Hour Demand Synchronization Time
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