Ext Ar Prot Trip (External Ar Protection Trip); Ext Ar Prot Start (External Ar Protection Start); Dar Complete (Delayed Autoreclose Complete); Cb In Service (Circuit Breaker In Service) - GE MiCOM P40 Agile Technical Manual

P14D
disabled. This mapping is not essential, because the No System Checks setting in the AUTORECLOSE column can
be enabled to achieve the same effect.
This DDB can also be mapped to an opto-input, to allow the IED to receive a signal from an external system
monitoring device, indicating that the system conditions are suitable for CB closing. This should not normally be
necessary, since the IED has comprehensive built in system check functionality.
4.9

EXT AR PROT TRIP (EXTERNAL AR PROTECTION TRIP)

The Ext AR Prot Trip signal allows Autoreclose initiation by a Trip from a separate protection device.
4.10

EXT AR PROT START (EXTERNAL AR PROTECTION START)

The Ext AR Prot Strt signal allows Autoreclose initiation by a Start from a separate protection device.
4.11

DAR COMPLETE (DELAYED AUTORECLOSE COMPLETE)

Some utilities require Delayed Autoreclose (DAR) functionality.
The DAR Complete signal can, if required, be mapped in PSL to provide a short pulse when a CB Close command is
given at the end of the dead time. If DAR Complete is activated during an Autoreclose cycle, the output signal DAR
in Progress resets, even though the reclaim time may still be running, and AR in Progress remains set until the end
of the reclaim time.
For most applications, DAR complete can be ignored (not mapped in PSL). In such cases, DAR in Progress operates
and resets in parallel with AR in Progress.
4.12

CB IN SERVICE (CIRCUIT BREAKER IN SERVICE)

The CB In Service signal must remain asserted when protection operates if autoreclose is to be initiated. For most
applications, it can be mapped to CB Closed 3ph. More complex PSL mapping can be programmed if required, for
example where it is necessary to confirm not only that the CB is closed but also that the line and/or bus VT is
actually live up to the instant of protection operation.
4.13

AR RESTART

In some applications, it is sometimes necessary to initiate an Autoreclose cycle by means of connecting an
external signal to an opto-input. This would be when the normal interlock conditions are not all satisfied, i.e. when
the CB is open and the associated feeder is dead. If the AR Restart input is mapped to an opto-input, activation of
that opto-input will initiate an Autoreclose cycle irrespective of the status of the CB in Service input, provided the
other interlock conditions, are still satisfied.
4.14

DT OK TO START (DEAD TIME OK TO START)

This is an optional extra interlock in the dead time initiation logic. In addition to the CB being open and the
protection reset, DT OK To Start has to be set high to allow the dead time function to be primed after an AR cycle
has started. Once the dead time function is primed, this signal has no further affect – the dead time function stays
primed even if the signal subsequently goes low. A typical PSL mapping for this input is from the Dead Line signal
from the System Check logic. This would enable dead time priming only when the feeder has gone dead after CB
tripping. If this extra dead time priming interlock is not required, DT OK To Start can be left unmapped, and it will
default to a high state.
4.15

DEADTIME ENABLED

This is an optional interlock in the dead time logic. This signal has to be high to allow the dead time to run. If this
signal goes low, the dead time stops and resets, but stays primed, and will restart from zero when it goes high
again. A typical PSL mapping is from the CB Healthy input or from selected signals from the System Check logic. It
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Chapter 13 - Autoreclose
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