Siemens SIPROTEC 7SS523 V3.2

Reading Out Information
213
7SS52 V4 Manual
C53000-G1176-C182-1
6.2.2 Reading Out Measured Values
The processing system determines operational measured values in the background.
The operational measured values can be retrieved from the display, read out via the
PC port using the PC, or they can be transmitted to a central station via the system
port.
No password is required for retrieving the measured values. After a few seconds the
values will be updated cyclically.
The possible measured value representation - as primary quantities or referenced to
the nominal value - are stated in Table 6-2, page 213.
from the PC
with DIGSI
To retrieve operational measured values of the central unit (PC linked to central unit)
proceed as follows:
 Click Measurement. In the navigation window you can now see the different groups
of measured values in the subdirectory of Measurement (Figure 6-1, page 207).
The measured values are subdivided into the following groups and subgroups:
• Operational values, primary with
Bay currents, primary values
• Operational normalized percent with
Bus Zone Id, Is
Check Zone Id, Is
Bay currents, percentage
relating to the standard normalized current
I
no
of the station;
• Operational percent with
Bus Zone Id, Is
Check Zone Id, Is
Bay currents, percentage
relating to the rated feeder current
I
N
;
3 dots (...) are displayed instead of the measured value if a measured value is not
available. If a value is indeterminate (e.g., f
N
, if no current is flowing), 3 dashes (---)
are shown. 3 asterisks (
) are displayed in the case of a fault in the bay unit.
Table 6-2 Operational Measured Values
Measured values primary I I
N
Id
L1
, Id
L2
, Id
L3
Differential currents – % I
no
%
Is
L1
, Is
L2
, Is
L3
Restraint currents – % I
no
%
I
L1
, I
L2
, I
L3
Feeder currents A % I
no
%
f
N
System frequency
(display only in the bay units)
Hz −−
Note
The percentages
I
no
refer to the normalized currents of the station, the percentages I
N
refer to the respective rated feeder current.
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