Maximum Number Of Reclosing Shots - ABB REL650 Applications Manual

Section 11
Control
11.2.2.7
11.2.2.8
11.2.2.9
11.2.2.10
11.2.2.11
308

Maximum number of reclosing shots

The maximum number of reclosing shots in an auto-reclosing cycle is selected by the
setting parameter NoOfShots.
3-phase reclosing, one to five shots according to setting NoOfShots.
A trip operation is made as a three-phase trip at all types of fault. The reclosing is as a
three-phase. Here, the auto-reclosing function is assumed to be "On" and "Ready". The
breaker is closed and the operation gear ready (operating energy stored). Input RI is
received and sealed-in. The output READY is reset (set to false). Output ACTIVE is set.
The timer for 3-phase auto-reclosing open time is started.
While any of the auto-reclosing open time timers are running, the output INPROGR is
activated. When the "open reset" timer runs out, the respective internal signal is
transmitted to the output module for further checks and to issue a closing command to the
circuit breaker.
When issuing a CB closing command a "reset" timer tReset is started. If no tripping takes
place during that time the auto-reclosing function resets to the "Ready" state and the signal
ACTIVE resets. If the first reclosing shot fails, 2nd to 5th reclosing shots will follow, if
selected.
Reclosing reset timer
The reset timer tReset defines the time it takes from issue of the reclosing command, until
the 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.
Transient fault
After the Reclosing command the reset timer keeps running for the set time. If no tripping
occurs within this time, tReset, the Auto-Reclosing will reset. The CB remains closed and
the operating gear recharges. The input signals 52a and CBREADY will be set
Permanent fault and reclosing unsuccessful signal
If a new trip occurs, and 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
1MRK 506 334-UUS A
Application manual