Siemens SIPROTEC 7SK80, Manual

Page: 277 / 512

Functions
2.20 Auxiliary Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012 277
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
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.
2.20.4.2 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.
16031
ϕ
(3Vo,INs) = MV Angle between 3Vo and INsens.
30701 Pa = MV Pa (active power, phase A)
30702 Pb = MV Pb (active power, phase B)
30703 Pc = MV Pc (active power, phase C)
30704 Qa = MV Qa (reactive power, phase A)
30705 Qb = MV Qb (reactive power, phase B)
30706 Qc = MV Qc (reactive power, phase C)
30707 PFa = MV Power Factor, phase A
30708 PFb = MV Power Factor, phase B
30709 PFc = MV Power Factor, phase C
30800 VX = MV Voltage VX
30801 Vph-n = MV Voltage phase-neutral
No. Information Type of In-
formation
Comments