ABB REL650 series Technical Manual page 376

Section 11
Control
370
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 synchronism 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 reset 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 reset 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.
1MRK 506 335-UUS A
Technical manual