ABB Relion 650 Series Technical Manual page 304

Section 10
Control
Reclosing checks and the reset timer
When dead time has elapsed during the auto-reclosing procedure certain conditions must be
fulfilled before the CB closing command is issued. To achieve this, signals are exchanged between
program modules to check that these conditions are met. In three-phase reclosing a synchronizing
and/or energizing check can be used. It is possible to use a synchronism check function in the
same physical device or an external one. The release signal is configured by connecting to the
auto-reclosing function input SYNC. If reclosing without checking is preferred the SYNC input can
be set to TRUE (set high). Another possibility is to set the output of the synchronism check
function to a permanently activated state. At confirmation from the synchronism check, the signal
passes on.
By choosing
breaker is also checked before issuing the CB closing command. If the CB has a readiness contact
CBReadyType = OCO (CB ready for an Open-Close-Open sequence) this condition may not
of type
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,
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.
298
CBReadyType = CO (CB ready for a Close-Open sequence) the readiness of the circuit
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