Blocking Of Shot Initiation; Simplified Shot Initiation Logic Diagram - ABB REF610 Technical Reference Manual

1MRS755535
Feeder Protection Relay
Technical Reference Manual - ANSI Version
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 0
100 ms
Shot Due
50P-1 Trip
External AR Initiation
51P Trip
51P pickup delay
51P Pickup
t
0
50N Trip
51N Trip
51N pickup delay
51N Pickup
t
0
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.
SG1/
Blocking of shot
1..8
REF610 REF610
Shot Initiation
Open CB Command
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