Settings - Siemens 7SJ82 Manual

The Automatic reclosing function provides the auxiliary functions Dead-line check and Reduced dead time.
For these auxiliary functions, the 3-phase voltage system has to be measured. If you want to use these auxil-
iary functions, the measuring point of the 3-phase voltage system must be connected to the Voltage function
group interface. This connection is also necessary if the Automatic reclosing function with adaptive dead
time function type is used.
Interface with Protection-Function Groups
The protection-function group is connected to 2 circuit breakers (2 Circuit-breaker function groups) for 1 1/2
circuit-breaker layouts.
Parameter: I Reference for % Values
•
Default setting (_:2311:101) Rated normal current = 1000 A
With the Rated normal current parameter, you set the primary current which serves as a reference for all
current-related % values within the Circuit-breaker function group. This applies both for operational measured
values and for setting values in %.
Enter the primary rated current of the protected object here.
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: V Reference for % Values
•
Default setting (_:2311:102) Rated voltage = 400 kV
With the Rated voltage parameter, you set the primary voltage, which serves as a reference for all voltage-
related % values within the Circuit-breaker function group. This applies both for operational measured values
and for setting values in %.
Enter the primary rated voltage of the protected object (for example, the line) here.
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: Current Threshold Circuit Breaker Open
•
Default setting (_:2311:112) Current thresh. CB open = 0.10 A
With the Current thresh. CB open parameter, you specify the threshold value below which the circuit-
breaker pole or the circuit breaker is recognized as open.
Set the Current thresh. CB open parameter so that the current measured when the circuit-breaker pole
is open will certainly fall below the parameterized value. If parasitic currents (for example, due to induction)
are excluded with the line deactivated, you can make a secondary setting of the value with a high degree of
sensitivity, to 0.05 A for example.
If no special requirements exist, Siemens recommends retaining the setting value of 0.10 A for secondary
purposes.

Settings

5.7.4
Addr.
Ref. for %-values
_:2311:101
_:2311:102
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Parameter C
General:Rated normal
current
General:Rated voltage
5.7 Function-Group Type Circuit Breaker
Setting Options
0.20 A to 100000.00 A
0.20 kV to 1200.00 kV
Function-Group Types
Default Setting
1000.00 A
400.00 kV
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