Functions
110
7SS52 V4 Manual
C53000-G1176-C182-1
Siemens recommends to set the parameter Id> CZ - EF (6111A/CU) to 70% of the
smallest 1-pole earth fault current to be expected.
Is< CZ - EF The parameter Is< CZ - EF (6110A/CU) is used to set the stabilizing current thresh-
old I
s
/I
no
for the check zone measuring system in the presence of a 1-pole earth fault.
This parameter is only displayed if the parameter EF charact.
(6320A/CU) is released.
Due to the special treatment of the stabilizing current of the check zone, the parameter
Is< CZ - EF (6110A/CU) is to be set to the value
Is< BZ - EF = 1.2 * 0.5 * I
max load
.
5.1.5 Settings for the Central Unit
Addr. Setting Title Setting Options Default Setting Comments
106A Combi-Coupler
YES
NO
NO Combi-Coupler
6101 STAB FAC:BZ 0.10 .. 0.80 0.65 Stabilizing factor - selective
6102 Id> BZ 0.20 .. 4.00 I/Ino 1.00 I/Ino Diff-current threshold - selective
6103 STAB FAC:CZ 0.00 .. 0.80 0.50 Stabilizing factor - check zone
6104 Id> CZ 0.20 .. 4.00 I/Ino 1.00 I/Ino Diff-current threshold - check zone
6108A Is< BZ - EF 0.00 .. 25.00 I/Ino 5.00 I/Ino Stabilizing current threshold - BZ - EF
6109A Id> BZ - EF 0.05 .. 4.00 I/Ino 0.25 I/Ino Diff-current threshold - selective - EF
6110A Is< CZ - EF 0.00 .. 25.00 I/Ino 4.50 I/Ino Stabilizing current threshold - CZ - EF
6111A Id> CZ - EF 0.05 .. 4.00 I/Ino 0.25 I/Ino Diff-current threshold - check zone - EF
6120A
EF charact. released
blocked
blocked Earth fault characteristic switchover
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