ABB REF 610 Technical Reference Manual page 32

REF 610
32
Feeder Protection Relay
Technical Reference Manual
Inhibition of the auto-reclose function
The AR function can be inhibited (AR Inhibit) by any of the following signals:
• external AR inhibit signal
• trip signal from the arc protection stage, ARC
• trip signal from the thermal protection stage, θ>
• trip signal from the CBFP
• alarm signal from the thermal protection stage, θ>
• trip signal from overcurrent stage I>>>
• trip signal from earth-fault stage I
• trip signal from the phase discontinuity stage, ∆I>
The trip signals from stages ARC and θ> and from the CBFP are fixed and will thus
always inhibit the AR function. External AR inhibition by the digital input signal is
selected in SGB, and the alarm signal from stage θ> and the trip signals from stages
>> and ∆I> in SG3 (see table 4.1.4.10-12).
I>>>, I
0
Note!
The AR function will remain inhibited after all inhibition signals have been reset for
a time equal in length to the set reclaim time.
Note!
Inhibition 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 inhibited for the
reclaim time.
• At manual circuit-breaker closing during an ongoing shot, the shot will be
interrupted and the AR function inhibited during the reclaim 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 dead time elapses, the AR function will issue a reclosing command to
the circuit breaker (Close CB Command). Reclosing can be inhibited via a digital
input (CB Close Inhibit). External inhibition of reclosing by the digital input
signal is selected in SGB.
When reclosing is inhibited, or the circuit breaker does not close before expiration
of the set CB closing time, the circuit breaker will remain open and the AR function
will generate a CB Reclosing Failed signal.
>>
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1MRS 755310