Reclosing Reset Timer; Pulsing Of The Cb Closing Command And Counter; Transient Fault; Permanent Fault And Reclosing Unsuccessful Signal - ABB Relion 670 Series Applications Manual

Section 13
Control
13.2.2.15

Reclosing reset timer

The reset timer
reclosing function 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 CB closing command is given.
13.2.2.16

Pulsing of the CB closing command and Counter

The CB closing command, CLOSECMD is given as a pulse with a duration set by parameter
For circuit-breakers without an anti-pumping function, close pulse cutting can be used. It is
selected by parameter
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 reset timer keeps running for the set time. If no tripping occurs
within this time,
gear recharges. The input signals 52a 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 RI 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 reset timer time-out
the Auto-Reclosing function resets, but the CB remains open. The "CB closed" information through
the input 52a 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
reset time. The "unsuccessful" signal can also be made to depend on CB position input. The
parameter
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
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:
278
tReset defines the time it takes from issue of the reclosing command, until the
CutPulse=On . In case of a new trip pulse (start), the closing command pulse
tReset , the Auto-Reclosing will reset. The CB remains closed and the operating
UnsucClByCBChk should then be set to CBCheck , and a timer tUnsucCl should be set
tUnsucCl . The Unsuccessful output can for example, be
1MRK 511 358-UUS A
M12391-202 v3
M12391-205 v3
tPulse .
M12391-208 v3
M12391-211 v4
M12391-214 v7
Application manual