Auto Reclosing Reset Timer - ABB REC670 Applications Manual

1MRK 511 401-UUS A
14.2.2.15
14.2.2.16
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Bay control REC670 2.2 ANSI
Application manual
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ANSI09000168 V1 EN-US
Figure 114: Selection of the auto-reclose mode from a hardware functional key in
front of the IED

Auto reclosing reset timer

The tReset timer defines the time it takes from issue of the breaker closing command,
until the auto recloser resets. Should a new trip occur during this time, it is treated as a
continuation of the first fault. The reclaim timer is started when the circuit breaker
closing command is given.
Pulsing of the circuit breaker closing command and counter
The circuit breaker closing command, CLOSECB is given as a pulse with a duration set
by the tPulse setting. For circuit breakers without an anti-pumping function, close
pulse cutting can be used. It is selected by the CutPulse setting. In case of a new start
pulse (trip), the breaker closing command pulse is then cut (interrupted). The minimum
breaker closing command pulse length is always 50ms. At the issue of the breaker
closing command, the appropriate auto recloser operation counter is incremented.
There is a counter for each type of auto reclosing command and one for the total
number of auto reclosing commands.
Transient fault
After the breaker closing command the reclaim timer keeps running for the set
tReclaim time. If no start (trip) occurs within this time, the auto recloser will reset. The
circuit breaker remains closed and the operating gear recharges. The CBCLOSED and
CBREADY input signals will be set.
Permanent fault and reclosing unsuccessful signal
If a new start occurs, and the number of auto reclosing shots is set to 1, and a new
START or TRSOTF input signal appears, after the circuit breaker closing command, the
UNSUCCL output (unsuccessful reclosing) is set high. The timer for the first shot can
no longer be started. Depending on the set number of auto reclosing shots further shots
SMBRREC (79)
SWPOSN MODEINT
Section 14
Control
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