ABB REF 610 Technical Reference Manual page 32

REF 610
32
Feeder Protection Relay
Technical Reference Manual - ANSI Version
Note!
In case of shot initiation while a blocking is active, the next shot (if such has been
selected and not blocked) will be initiated. This can be used to skip Shot 1, for
instance.
Disable of the auto-reclose function
The AR function can be disabled (AR Disable) by any of the following signals:
• external AR disable signal
• trip signal from the arc protection element, ARC
• trip signal from the thermal protection element, 49
• trip signal from the CBFAIL
• alarm signal from the thermal protection element, 49
• trip signal from overcurrent element 50P-2
• trip signal from ground-fault element 50N
• trip signal from the phase discontinuity element, 46
The trip signals from elements ARC and 49 and from the CBFAIL are fixed and will
thus always disable the AR function. External AR disable by the digital input signal
is selected in SGB, and the alarm signal from element 49 and the trip signals from
elements 50P-2, 50N and 46 in SG3 (see table 4.1.4.10-12).
Note!
The AR function will remain disabled after all disable signals have been reset for a
time equal in length to the set reset time.
Note!
Disable will always also interrupt any ongoing shot.
Information on the circuit-breaker position
The AR function requires information on the circuit-breaker position. Any digital
input can be selected for the information on the circuit breaker being open (CB
Position Open) and closed (CB Position Closed) in SGB. Normally, two
digital inputs is recommended although either one is enough for the AR function.
Information on the circuit-breaker position is used in the following situations:
• At manual circuit-breaker closing, the AR function will be disabled for the reset
time.
• At manual circuit-breaker closing during an ongoing shot, the shot will be
interrupted and the AR function disabled during the reset time.
• Shot initiation is allowed only when the circuit breaker is closed.
• Reclosing of the circuit breaker is ended immediately after the AR function has
received information that the circuit breaker has been closed.
Circuit-breaker closing
When the set open time elapses, the AR function will issue a reclosing command to
the circuit breaker (Close CB Command). Reclosing can be disabled via a digital
input (CB Close Disable). External disable of reclosing by the digital input
signal is selected in SGB.
1MRS 755535