The reclose controller calculates the reclose, discrimination and reclaim times. The reclose time is started when the INPRO signal is activated, that is, when the sequence starts and the activated CBB defines the reclose time.
When the reclose time has elapsed, the CLOSE_CB output is not activated until the following conditions are fulfilled:
- The SYNC input must be TRUE if the particular CBB requires information about the synchronism
- All AR initiation inputs that are defined protection lines (using the Control line setting) are inactive
- The circuit breaker is open
- The circuit breaker is ready for the close command, that is, the CB_READY input is TRUE. This is indicated by active READY output.
If at least one of the conditions is not fulfilled within the time set with the Auto wait time parameter, the autoreclose sequence is locked.
The synchronism requirement for the CBBs can be defined with the Synchronisation set setting, which is a bit mask. The lowest bit in the Synchronisation set setting is related to CBB1 and the highest bit to CBB7. For example, if the setting is set to "1", only CBB1 requires synchronism. If the setting is it set to "7", CBB1, CBB2 and CBB3 require the SYNC input to be TRUE before the reclosing command can be given.
The discrimination time starts when the close command CLOSE_CB has been given. If a start input is activated before the discrimination time has elapsed, the AR function goes to lockout. The default value for each discrimination time is zero. The discrimination time can be adjusted with the Dsr time shot 1…4 parameter.