Functions
2.26 Additional Functions
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
480
2.26.8 Demand Measurement Setup
Long-term average values are calculated by 7SD5 and can be read out with the point of time (date and time)
of the last update.
2.26.8.1 Long-Term Average Values
The long-term average values of the three phase currents I
Lx
, the positive sequence component I
1
of 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 fre-
quency with which it is updated can be set. The corresponding min/max values can be reset via binary inputs,
via the integrated control panel or using the DIGSI software.
2.26.8.2 Setting Notes
Mean values
The time interval for measured value averaging is set at address 2801 DMD Interval. The first number spec-
ifies the averaging time window in minutes while the second number gives the frequency of updates within the
time window. 15 Min., 3 Subs, 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 2802 DMD Sync.Time you can determine whether the averaging time, selected under address
2801, begins on the hour (full hour) or is to be synchronized with another point in time (a quarter past,
half hour or a quarter to).
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.
2.26.8.3 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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