Average Measurements; Description; Setting Notes - Siemens SIPROTEC 7SC80 Series Manual

2.14.4

Average Measurements

The long-term averages are calculated and output by the 7SC80.

2.14.4.1 Description

Long-Term Averages
The long-term averages of the three phase currents I
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.

2.14.4.2 Setting Notes

Average Calculation
The selection of the time period for measured value averaging is set with parameter 8301 DMD Interval in
the corresponding setting group from A to D under 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: Time average is generated for all measured values with a window
of 15 minutes. The output is updated every 15/3 = 5 minutes.
With address 8302 DMD Sync.Time, the starting time for the averaging window set under address 8301 is
determined. This setting specifies if the window should start on the hour (On The Hour) or 15 minutes later
(15 After Hour) or 30 minutes / 45 minutes after the hour (30 After Hour, 45 After Hour).
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.
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
, the positive sequence components I
x
Functions
2.14 Additional Functions
for the three phase
1
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