Auto Reclosing Reset Timer - ABB RELION 670 SERIES Applications Manual

1MRK 506 369-UUS -
15.2.2.15
15.2.2.16
15.2.2.17
15.2.2.18
Line distance protection REL670 2.2 ANSI
Application manual

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 may be made
or the auto reclosing sequence is ended. After reclaim timer time-out the auto recloser
resets, but the circuit breaker remains open. The circuit breaker closed information
through the CBCLOSED input is missing. Thus, the auto recloser is not ready for a new
auto reclosing cycle. Normally, the UNSUCCL output appears when a new start is
received after the last auto reclosing shot has been made and the auto recloser is inhibited.
The output signal resets after reclaim time. The "unsuccessful" signal can also be made to
depend on the circuit breaker position input. The UnsucClByCBChk setting should then be
set to CBCheck, and the tUnsucCl timer should be set too. If the circuit breaker does not
respond to the breaker closing command and does not close, but remains open, the
UNSUCCL output is set high after the set tUnsucCl time. The UNSUCCL output can for
example, be used in multi-breaker arrangement to cancel the auto reclosing for the second
circuit breaker, if the first circuit breaker closed onto a persistent fault. It can also be used
Section 15
Control
663