Settings For Breaker Pole Discrepancy Supervision - Siemens 7SV512 Instruction Manual

7SV512
V1
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 is confi-
gured as EXIST under address 7838 (refer Section
5.4.2).
The pole discrepancy supervision avoids that only
one or two poles of the feeder circuit breaker is open
continuously. Either the auxiliary contacts of each in-
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.
3 8 0 0 P O L E
D I S C R E P A N C Y
3 8 0 1 P O L E - D I S C R
O N
O F F
3 8 0 2 T - D I S C R E P
2 . 0 0 s
82
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
time may be limited by 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.
Beginning of the block "Pole discrepancy supervi-
sion"
Pole discrepancy supervision is
ON
switched on
OFF
switched off
Delay time for three-pole trip by the pole discrepancy
supervision
Smallest setting value:
Largest setting value:
or 1, i.e. no trip in this case
Operating instructions
0.00 s
32.00 s
C53000---G1176---C91