Pulsing Of The Cb Closing Command And Counter; Transient Fault; Permanent Fault And Reclosing Unsuccessful Signal; Lock-Out Initiation - ABB Relion REC670 Applications Manual

Section 13
Control
13.2.2.16

Pulsing of the CB closing command and Counter

The CB closing command, CLOSECB is given as a pulse with a duration set by parameter
tPulse . For circuit-breakers without an anti-pumping function, close pulse cutting can be used.
It is selected by parameter
command pulse is then cut (interrupted). The minimum closing pulse length is always 50 ms.
At the issue of the Reclosing command, the appropriate Reclosing operation counter is
incremented. There is a counter for each type of Reclosing and one for the total number of
Reclosing commands.
13.2.2.17

Transient fault

After the Reclosing command the reclaim timer keeps running for the set time. If no tripping
occurs within this time,
operating gear recharges. The input signals CBPOS and CBREADY will be set
13.2.2.18

Permanent fault and reclosing unsuccessful signal

If a new trip occurs, and number of reclosing shots is set to 1, a new input signal START or
TRSOTF appears, after the CB closing command, the output UNSUCCL (unsuccessful closing)
is set high. The timer for the first shot can no longer be started. Depending on the set number
of Reclosing shots further shots may be made or the Reclosing sequence is ended. After
reclaim timer time-out the Auto-Reclosing function resets, but the CB remains open. The "CB
closed" information through the input CBPOS is missing. Thus, the reclosing function is not
ready for a new reclosing cycle.
Normally, the signal UNSUCCL appears when a new trip and start is received after the last
reclosing shot has been made and the auto-reclosing function is blocked. The signal resets
after reclaim time. The "unsuccessful" signal can also be made to depend on CB position input.
The parameter
be set too. If the CB does not respond to the closing command and does not close, but
remains open, the output UNSUCCL is set high after time
can for example, be used in Multi-Breaker arrangement to cancel the auto-reclosing function
for the second breaker, if the first breaker closed onto a persistent fault. It can also be used to
generate a Lock-out of manual closing until the operator has reset the Lock-out, see separate
section.
13.2.2.19

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 Autoreclose
function and connected to Binary IO as required. Many alternative ways of performing the logic
exist depending on whether manual 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:
• Shall back-up time delayed trip give Lock-out (normally yes)
• Shall Lock-out be generated when closing onto a fault (mostly)
• Shall Lock-out be generated when the Autorecloser was OFF at the fault or for example, in
Single phase AR mode and the fault was multi-phase (normally not as no closing attempt
has been given)
• Shall Lock-out be generated if the Breaker did not have sufficient operating power for an
auto-reclosing sequence (normally not as no closing attempt has been given)
246
CutPulse=On . In case of a new trip pulse (start), the closing
tReclaim , the Auto-Reclosing will reset. The CB remains closed and the
UnsucClByCBChk should then be set to CBCheck , and a timer tUnsucCl should
1MRK 511 358-UEN A
tUnsucCl . The Unsuccessful output
Application manual
M12391-205 v3
M12391-208 v3
M12391-211 v4
M12391-214 v7