Settings - Siemens SIPROTEC 7SA6 Manual

6.18.3 Settings

Addr. Setting Title
3901 FCT BreakerFail
3902 I> BF
3903 1p-RETRIP (T1)
3904 T1-1pole
3905 T1-3pole
3906 T2
3907 T3-BkrDefective
3908 Trip BkrDefect.
3909 Chk BRK CON-
TACT
3921 End Flt. stage
3922 T-EndFault
3931 PoleDiscrepancy
3932 T-PoleDiscrep.
7SA6 Manual
C53000-G1176-C156-2
The delay time T-PoleDiscrep. (address 3932 ) determines how long a breaker
pole discrepancy condition of the feeder circuit breaker, i.e. only one or two poles
open, may be present before the pole discrepancy supervision issues a three-pole trip
command. This time must clearly be longer than the duration of a single-pole
automatic reclose cycle. The time should be less than the permissible duration of an
unbalanced load condition which is caused by the unsymmetrical position of the circuit
breaker poles. Conventional values are 2 s to 5 s.
Note: The indicated secondary current values for setting ranges and default settings
refer to I = 1 A. For the nominal current 5 A the current values are to be multiplied
N
by 5.
Setting Options
ON
OFF
0.05..20.00 A
NO
YES
0.00..30.00 sec; ∞
0.00..30.00 sec; ∞
0.00..30.00 sec; ∞
0.00..30.00 sec; ∞
NO
trips with T1-trip-signal
trips with T2-trip-signal
trips with T1 and T2-trip-
signal
NO
YES
ON
OFF
0.00..30.00 sec; ∞
ON
OFF
0.00..30.00 sec; ∞
Default Setting
ON Breaker Failure Protection is
0.10 A Pick-up threshold I>
YES 1pole retrip with stage T1 (local
trip)
0.00 sec T1, Delay after 1pole start (local
trip)
0.00 sec T1, Delay after 3pole start (local
trip)
0.15 sec T2, Delay of 2nd stage (busbar
trip)
0.00 sec T3, Delay for start with defective
bkr.
NO Trip output selection with defec-
tive bkr
YES Check Breaker contacts
OFF End fault stage is
2.00 sec Trip delay of end fault stage
OFF Pole Discrepancy supervision
2.00 sec Trip delay with pole discrepancy
Functions
Comments
6-263