Functions
2.17 Additional Functions
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
210
2.17.7 Demand Measurement Setup
The long-term averages are calculated and output by the 7SD80.
2.17.7.1 Description
Long-Term Averages
The long-term averages of the three phase currents I
x
, 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 averages mentioned above, the length of the time window for averaging and the frequency
with which it is updated can be set.
2.17.7.2 Setting Notes
Averaging
The selection of the time period for measured value averaging is set using the parameter 2801 DMD Interval
in the corresponding setting group from A to D at MEASUREMENT. The first number specifies 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: Averaging over time for all measured values that arrive within a time
window of 15 minutes. The output is updated every 15/3 = 5 minutes.
Address 2802 DMD Sync.Time allows you to specify whether the time period of averaging selected at address
2801 starts on the hour (On The Hour) or whether it is synchronized with any of the other times (15 After
Hour, 30 After Hour or 45 After Hour).
If the settings for averaging are changed, 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.
2.17.7.3 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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