Alstom MiCOM P546 - 4.1.4 Auto-reclose logic outputs (P543;P545); 4.1.4.1 AR 1 pole in progress (P543;P545); 4.1.4.2 AR 3 pole in progress (P543;P545); 4.1.4.3 Successful close (P543;P545)

P54x/EN OP/La4 Operation
(OP) 5-138 MiCOM P543, P544, P545 & P546
OP
4.1.4 Auto-reclose logic outputs (P543/P545)
The following DDB signals can be masked to a relay contact in the PSL or assigned to a
Monitor Bit in Commissioning Tests, to provide information about the status of the
auto-reclose cycle. These are described below, identified by their DDB signal text.
4.1.4.1 AR 1 pole in progress (P543/P545)
The AR 1 P
ole in Progress output indicates that single pole auto-reclose is in progress.
The output is on from protection initiation to the end of the single pole dead time, 1 Pole
Dead Time.
4.1.4.2 AR 3 pole in progress (P543/P545)
The AR 3 Pol
e in Progress output indicates that three pole auto-reclose is in progress. The
output is on from protection initiation to the end of the three pole dead time, ‘Dead Time 1, 2,
3, 4’.
4.1.4.3 Successful close (P543/P545)
The AR Su
ccessful Reclose output indicates that an auto-reclose cycle has been
successfully completed. A successful auto-reclose signal is given after the CB has tripped
from the protection and reclosed whereupon the fault has been cleared and the reclaim time
has expired resetting the auto-reclose cycle. The successful auto-reclose output is reset at
the next CB trip or from one of the reset lockout methods; see section 4.1.7.5 ’Reset from
lockout’.
4.1.4.4 AR status (P543/P545)
The A/R In
Status 1P output indicates that the relay is in the single phase auto-reclose
mode. The A/R In Status 3P output indicates that the relay is in the three phase
auto-reclose mode.
4.1.4.5 Auto close (P543/P545)
The Au
to Close output indicates that the auto-reclose logic has issued a close signal to the
CB. This output feeds a signal to the control close pulse timer and remains on until the CB
has closed. This signal may be useful during relay commissioning to check the operation of
the auto-reclose cycle. This signal is combined with the manual close signal to produce the
signal Control Close which should be mapped to an output contact.
4.1.5 Auto-reclose alarms (P543/P545)
The follo
wing DDB signals will produce a relay alarm. These are described below, identified
by their DDB signal text.
4.1.5.1 AR No checksync (latched) (P543/P545)
The AR No
Checksync alarm indicates that the system voltages were not in synchronism at
the end of the Check Sync Time, leading to a lockout condition. This alarm can be reset
using one of the reset lockout methods; see section 4.1.7.5 ’Reset from lockout’.
4.1.5.2 AR CB unhealthy (latched) (P543/P545)
The A
R CB Unhealthy alarm indicates that the CB Healthy input was not energized at the
end of the CB Healthy Time, leading to a lockout condition. The CB Healthy input is used
to indicate that there is sufficient energy in the CB operating mechanism to close and trip the
CB at the end of the dead time. This alarm can be reset using one of the reset lockout
methods; see section 4.1.7.5 ’Reset from lockout’.