Pulsing Of The Circuit Breaker Closing Command And Counter; Transient Fault; Permanent Fault And Reclosing Unsuccessful Signal; Lock-Out Initiation - ABB RER670 Applications Manual

Section 12
Control
12.2.2.9
12.2.2.10
12.2.2.11
12.2.2.12
228

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 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.

Lock-out initiation

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:
1MRK 506 375-UEN A
M12391-205 v4
M12391-208 v4
M12391-211 v5
M12391-214 v8
Railway application RER670 2.2 IEC
Application manual