4 AUTORECLOSE FUNCTION INPUTS
The Autoreclose function has several logic inputs, which can be mapped to any of the opto-inputs or to one or
more of the DDB output signals generated by the PSL
. The functions of these inputs are described below.
4.1 CB HEALTHY
It is necessary to establish if there is sufficient energy in the circuit breaker (spring charged, gas pressure healthy,
etc.) before the CB can be closed. This CB Healthy
input is used to ensure this before initiating a CB closed 3ph
command. If on completion of the dead time, the CB Healthy input is low, and remains low for a period given by
the CB Healthy Time timer, lockout will result and the circuit breaker will remain open.
The majority of circuit breakers are only capable of providing a single trip-close-trip cycle, in which case the CB
Healthy signal would stay low after one Autoreclose shot, resulting in lockout.
This check can be disabled by not allocating an opto-input for the CB Healthy signal, whereby the signal defaults
to a High state.
4.2 BLOCK AR
The Block AR input blocks the Autoreclose f
unction and causes a lockout. It can be used when protection
operation without Autoreclose is required. A typical example is on a transformer feeder, where Autoreclose may be
initiated by the feeder protection but blocked by the transformer protection.
4.3 RESET LOCKOUT
The R
eset Lockout input can be used to reset the Autoreclose function following lockout. It also resets any
Autor
eclose alarms, provided that the signals that initiated the lockout have been removed.
4.4 AR AUTO MODE
The AR Auto Mode input is used to select the Auto operating mode. In this mode, the Autor
eclose function is in
service.
4.5 AUTO MODE
The Auto Mode input is used to select the Auto operating mode. In this mode, the Autoreclose f
unction is in service.
4.6 LIVELINE MODE
The Liv
e Line Mode input is used to select the Live Line operating mode when Autoreclose is out of service and all
block
ing of instantaneous protection by Autoreclose is disabled. This operating mode takes precedence over all
other operating modes for safety reasons, as it indicates that utility personnel are working near live equipment.
4.7 TELECONTROL MODE
The Telecontrol
input is used to select the Telecontrol operating mode so that the Auto and Non-auto modes of
operation can be selected remotely.
4.8 CIRCUITS OK
The Circuits OK
signal is a signal indicating the status of the Live Line / Dead Bus or Live Bus / Dead Line system
conditions (High = OK, Low = Not OK). The logic required can be derived in the PSL from the Live Line, Dead Line,
Live Bus and Dead Bus signals in the System Check logic (if applicable), or it can come from an external source
depending on the application.
Chapter 13 - Autoreclose P14x
280 P14xEd1-TM-EN-1
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