Siemens 7SJ85 - Write-Protected Settings; Settings

If the device works with the IEC 61850 protocol, then you change only the setting value of the parameter via
DIGSI 5 and not directly on the device. If you change the setting value directly on the device, then the
IEC 61850 configuration of the metered values can be faulty.
Parameter: Power-sys. neutral point
•
Default setting (_:9451:149) Power-sys. neutral point = grounded
With the Power-sys. neutral point setting, you specify whether the system neutral is grounded ,
isolated , or suppress. coil grounded (grounded via arc-suppression coil). Currently, the parameter
does not affect any protection function; only if the Automatic reclosing function uses the voltage measure-
ment.
You can find more information in Chapter 6.45.1 Overview of Functions.
Parameter: P, Q sign
•
Default setting (_:9451:158) P, Q sign = not reversed
The power and energy values are defined by the manufacturer such that power in the direction of the
protected object is considered positive. You can also define the power output by the protected object (for
example, as seen by the consumer) as positive. With the P, Q sign setting, you can invert the sign for
these components. This inversion does not influence any protection function.
Write-Protected Settings
The settings listed here are used primarily for understanding during configuration of the function groups. They
are calculated on the basis of other settings and cannot be directly changed.
Addr.
Parameters C Range of Values Default Setting
Network data
_:103 General:rated apparent
power
0.20 MVA to 5 000.00 MVA 692.82 MVA
i
i
NOTE
You can find more detailed information on the Process monitor in chapter 5.8 Process Monitor.
Settings
Addr.
Parameter C Setting Options Default Setting
Rated values
_:9451:101 General:Rated current 1 A to 100000 A 1000 A
_:9451:102 General:Rated voltage 0.20 kV to 1200.00 kV 400.00 kV
Power-system data
_:9451:149 General:Power-sys. neutral
point
•
grounded
•
suppress. coil grounded
•
isolated
grounded
Measurements
_:9451:158 General:P, Q sign
•
not reversed
•
reversed
not reversed
5.1.4
5.1.5
Function-Group Types
5.1 Function-Group Type Voltage/current 3-Phase
SIPROTEC 5, Overcurrent Protection, Manual 201
C53000-G5040-C017-8, Edition 07.2017