Settings - Siemens SIPROTEC 7SA522 Manual

2 Functions
Pole Discrepancy
Supervision

2.18.3 Settings

Addr. Parameter
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 CONTACT
3921 End Flt. stage
3922 T-EndFault
3931 PoleDiscrepancy
3932 T-PoleDiscrep.
312
The pole discrepancy supervision can be switched 21 or 2)) independently at
address   3ROH'LVFUHSDQF\. It is only useful if the breaker poles can be oper-
ated individually. It avoids that only one or two poles of the local breaker are open
during steady state. It has to be provided that either the auxiliary contacts of each pole
or the series connection of the NO auxiliary contacts and the series connection of the
NC auxiliary contacts are connected to the device's binary inputs. If these conditions
are not fulfilled, switch address   2)).
The delay time 73ROH'LVFUHS (address  ) 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 automat-
ic reclose cycle. The time should be less than the permissible duration of an unbal-
anced load condition which is caused by the unsymmetrical position of the circuit
breaker poles. Conventional values are 2 s to 5 s.
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
C Setting Options
ON
OFF
1A 0.05 .. 20.00 A
5A 0.25 .. 100.00 A
NO
YES
0.00 .. 30.00 sec; ∞
0.00 .. 30.00 sec; ∞
0.00 .. 30.00 sec; ∞
0.00 .. 30.00 sec; ∞
NO
with T1-trip
with T2-trip
w/ T1/T2-trip
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>
0.50 A
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 de-
fective bkr.
NO Trip output selection with
defective bkr
YES Check Breaker contacts
OFF End fault stage is
2.00 sec Trip delay of end fault stage
OFF Pole Discrepancy supervi-
sion
2.00 sec Trip delay with pole discrep-
ancy
Comments
7SA522 Manual
C53000-G1176-C155-3