41
Shot initiation by a pickup signal applies only to shot 1 and definite
tripping.
The AR function will issue an opening command to the circuit breaker
at shot initiation by a pickup or a trip signal.
CB Closed
Shot Due
Shot Initiation
50P-1 Trip
External AR Initiation
51P Trip
51P Pickup
51P pickup delay
t
0
51N Pickup
51N pickup delay
t
0
50N Trip
51N Trip
SG1/
1..8
0
100 ms
Open CB Command
Blocking of shot
A060585
Fig. 5.1.4.8.-2
Simplified shot initiation logic diagram
Blocking of shot initiation
The initiation of one or several auto-reclose shots can be set to be blocked by any of
the following signals:
*
External AR initiation signal
*
Trip signal from overcurrent elements 51P and 50P-1
*
Trip signal from ground-fault elements 51N and 50N
The selection is made in SG1 (see Table 5.1.4.10.-10).
Blocking of shot initiation can also be used to skip the entire shot sequence (by
blocking the initiation of all three shots), and go directly to definite tripping.
Further, it can be used, for instance, to allow shot initiation by the trip signal from
element 51P, but to go directly to definite tripping in case of shot initiation by the
trip signal from element 50P-1.
Feeder Protection Relay
Technical Reference Manual - ANSI Version
REF610
REF610
1MRS755535
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