Operating instructions7SV512
V1
C53000---G1176---C91
82
6.3.7 Settings for breaker pole discrepancy supervision --- address block 38
A precondition for the correct operation of the pole
discrepancy supervision is that this function isconfi-
gured as EXIST under address 7838 (refer Section
5.4.2).
The pole discrepancy supervision avoids that only
one ortwopoles ofthe feeder circuitbreaker isopen
continuously.Either theauxiliary contacts ofeachin-
dividual breaker pole or a series and parallel con-
nection of the auxiliary contacts must be connected
to binary inputs of the device, for this task.
The delay time T---DISCREP (address 3802) deter-
mines how long time 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. The time must clearly be longer than the
duration of a single-pole auto-reclose cycle. The
timemaybe limited bythe permissible duration ofan
unbalanced load condition which is caused by the
unsymmetrical position of the circuit breaker poles.
Conventional values are 2 s to 5 s.
3 8 0 0 P O L E
D I S C R E P A N C Y
Beginning of the block ”Pole discrepancy supervi-
sion”
3 8 0 1 P O L E - D I S C R
O N
O F F
Pole discrepancy supervision is
ON switched on
OFF switched off
Delay time for three-pole trip by the pole discrepancy
supervision
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
3 8 0 2 T - D I S C R E P
2 . 0 0 s
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