ABB Relion 670 Series Technical Reference Manual page 319

1MRK 505 208-UEN B
Technical reference manual
to TRUE (set high). Another possibility is to set the output of the synchro-check
function to a permanently activated state. At confirmation from the synchro-check,
or if the reclosing is of single-phase or two-phase type, the signal passes on. At single-
phase, two-phase reclosing and at three-phase high-speed reclosing started by
STARTHS, synchronization is not checked, and the state of the SYNC input is
disregarded.
By choosing CBReadyType = CO (CB ready for a Close-Open sequence) the
readiness of the circuit breaker is also checked before issuing the CB closing
command. If the CB has a readiness contact of type CBReadyType = OCO (CB
ready for an Open-Close-Open sequence) this condition may not be complied with
after the tripping and at the moment of reclosure. The Open-Close-Open condition
was however checked at the start of the reclosing cycle and it is then likely that the
CB is prepared for a Close-Open sequence.
The synchro-check or energizing check must be fulfilled within a set time interval,
tSync. If it is not, or if other conditions are not met, the reclosing is interrupted and
blocked.
The reclaim timer defines a time from the issue of the reclosing command, after
which 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.
A number of outputs for Autoreclosing state control keeps track of the actual state
in the reclosing sequence.
Section 11
Control
313