12.2.2.9
Pulsing of the circuit breaker closing command and counter
M12391-205 v4
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.
12.2.2.10
Transient fault
M12391-208 v4
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.
12.2.2.11
Permanent fault and reclosing unsuccessful signal
M12391-211 v5
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
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 to generate a lock-
out of manual circuit breaker closing until the operator has reset the lock-out, see
separate section.
12.2.2.12
Lock-out initiation
M12391-214 v8
In many cases there is a requirement that a lock-out is generated when the auto
reclosing attempt fails. This is done with logic connected to the in- and outputs of
the auto recloser and connected to binary I/O as required. Many alternative ways of
performing the logic exist depending on whether manual circuit breaker closing is
interlocked in the IED, whether an external physical lock-out relay exists and
whether the reset is hardwired, or carried out by means of communication. There
are also different alternatives regarding what shall generate lock-out. Examples of
questions are:
Section 12
1MRK 506 375-UEN A
Control
228
Railway application RER670 2.2 IEC
Application manual
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