Average Measurements; Description; Setting Notes - Siemens 7SK80 Manual

No. Information
ϕ(3Vo,INs) =
16031
30701 Pa =
30702 Pb =
30703 Pc =
30704 Qa =
30705 Qb =
30706 Qc =
30707 PFa =
30708 PFb =
30709 PFc =
30800 VX =
30801 Vph-n =
2.20.4

Average Measurements

The long-term averages are calculated and output by the 7SK80.

2.20.4.1 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.

2.20.4.2 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, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Type of In-
formation
MV Angle between 3Vo and INsens.
MV Pa (active power, phase A)
MV Pb (active power, phase B)
MV Pc (active power, phase C)
MV Qa (reactive power, phase A)
MV Qb (reactive power, phase B)
MV Qc (reactive power, phase C)
MV Power Factor, phase A
MV Power Factor, phase B
MV Power Factor, phase C
MV Voltage VX
MV Voltage phase-neutral
, the positive sequence components I
x
2.20 Auxiliary Functions
Comments
for the three phase
1
Functions
277