ABB REL650 Technical Manual page 374

Section 11
Control
368
Auto reclosing sequence
When the function has started and the dead time has elapsed during the auto
reclosing sequence, certain conditions must be fulfilled before the circuit breaker
closing command is issued. In three-phase reclosing, a synchrocheck and/or
energizing check can be used. It is possible to use a synchrocheck function in the
same physical device or an external one. The synchrocheck release signal shall be
connected to the auto reclosing SYNC input. If reclosing without synchrocheck is
preferred the SYNC input can be set to TRUE (set high) permanently. The
synchrocheck release signal is not checked for single-phase or two-phase auto
reclosing. When a three-phase high-speed reclosing started by STARTHS input,
synchronization is not checked either, and the state of the SYNC input is
disregarded. The SYNC input shall be true within a set time interval, tSync. If it is
not, the auto reclosing is interrupted and the SYNCFAIL and ABORTED outputs are
activated.
By choosing CBReadyType = CO (circuit breaker ready for a Close-Open
sequence) the readiness of the circuit breaker is also checked before issuing the
circuit breaker closing command. If the circuit breaker has a readiness contact of
type CBReadyType = OCO (circuit breaker ready for an Open-Close-Open
sequence) this condition may not be fulfilled during the dead time and at the
moment of auto reclosure. The Open-Close-Open condition was however checked
at the start of the auto reclosing cycle and it is then likely that the circuit breaker is
prepared for a Close-Open sequence.
The reclaim timer, tReclaim, is started each time a circuit breaker closing command
is given. If no start occurs within this time, the auto recloser will reset. A new start
received in "reclaim time" status will move the auto recloser to "in progress" status
and next shot as long as the final shot is not reached. The auto recloser will reset
and enter "inactive" status if a new start is given during the final reclaim time. This
will also happen if the circuit breaker has not been closed within set time interval
tUnsucCl after each circuit breaker close command. The latter case is controlled by
setting UnsucClByCBChk. The auto reclosing sequence is considered unsuccessful
for both above cases and the UNSUCCL output is activated.
If the circuit breaker closing command is given and the circuit breaker is closed
within the set time interval tUnsucCl, the SUCCL output is activated after the set
time interval tSuccessful. The logic for successful and unsuccessful reclosing
indication is shown in Figure 180.
1MRK 506 382-UEN A
GUID-78AAE7CD-702E-407B-94D2-6A70BAFC8E70 v1
Line distance protection REL650 2.2 IEC
Technical manual