End Fault Protection
137
7SS52 V4 Manual
C53000-G1176-C182-1
5.4.3 Setting Notes
T-CB open The parameter T-CB open (XX23/CU) is used to delay processing of the circuit
breaker OPEN status for special treatment of the coupler currents and for the end fault
protection.
End Fault Prot If the bay is configured as a feeder, the parameter End Fault Prot (XX29/CU) is
used to activate and deactivate the end fault protection. For coupler bays the setting
of this parameter is not relevant.
T-BF-1P The parameter T-BF-1P (XX20/CU) is used to delay for 1-pole earth faults the TRIP
command and the transfer trip signal issued by the breaker failure protection.
This delay time must be set higher than the sum of delay times set with the parameters
T-TRIP repeat (XX25/CU) aund Tmin TRIP (6106/CU) for 2-stage CBF.
Siemens recommends to set this parameter to twice the circuit breaker trip time.
T-BF-mP The parameter T-BF-mP (XX21/CU) is used to delay for multipole faults the TRIP
command and the transfer trip signal issued by the breaker failure protection.
This delay time must be set higher than the sum of delay times set with the parameters
T-TRIP repeat (XX25/CU) aund Tmin TRIP (6106/CU) for 2-stage CBF.
Siemens recommends to set this parameter to twice the circuit breaker trip time.
5.4.4 Settings for the Central Unit
Addr. Setting Title Setting Options Default Setting Comments
118 I> BF 0.10 .. 2.00 I / In 0.50 I / In Current threshold for BF
119 I> BF-EF 0.05 .. 2.00 I / In 0.25 I / In Current threshold for BF - EF
120 T-BF-1P 0.05 .. 10.00 s 0.25 s Time delay for BF with 1-pole fault
121 T-BF-mP 0.05 .. 10.00 s 0.25 s Time delay for BF with multi-pole
faults
125 T-TRIP repeat 0.00 .. 10.00 s 0.12 s Time delay for TRIP repeat
126 T-CB open 0.00 .. 10.00 s 0.00 s Time delay for CB open
129 End Fault Prot ON
OFF
OFF End fault protection
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