Chapter 13 - Autoreclose
If I>1 AR is set to Initiate Main AR, operation of the I>1 protection stage will initiate Autoreclose
If ISEF>1 AR is set to No Action, operation of the ISEF>1 protection stage will lead to a CB trip but no reclose.
Otherwise it can be used to initiate Main autoreclose or SEF autoreclose.
A selection must be made for each protection stage that is enabled.
A separate protection device may also initiate Autoreclose. The Autoreclose can be initiated from a protection Trip,
or when sequence coordination is required from a protection Start. If external triggering of Autoreclose is required,
the following DDB signals should be mapped to opto-inputs:
Ext AR Prot Trip
Ext AR Prot Strt (if applicable)
In addition, the setting Ext Prot should be set to Initiate Main AR.
Although a protection start and a protection trip can initiate an AR cycle, several checks still have to be performed
before the initialisation signal is given. Some of the checks are listed below:
Auto Mode has been selected
Live line mode is disabled
The number of main protection and SEF shots have not been reached
Sequence co-ordination is enabled (for protection start to initiate AR. This is not necessary if a protection
trip is doing the initiating)
The CB Ops Lockout DDB signal is not set
The CB in Service DDB signal is high
The relevant protection trip must be mapped to the Trip Command In DDB.