ABB REC670 Applications Manual page 320

Section 14
Control
314
CBCLOSED and CBREADY
These binary inputs should pick-up information from the circuit breaker. At three
operating gears in the circuit breaker (single pole operated circuit breakers) the
connection should be "All poles closed" (series connection of the NO contacts) or
"At least one pole open" (parallel connection of NC contacts). The CBREADY is a
signal meaning that the circuit breaker is ready for an auto reclosing operation,
either Close-Open (CO), or Open-Close-Open (OCO). If the available signal is of
type "circuit breaker not charged" or "not ready", an inverter can be inserted in
front of the CBREADY input.
INHIBIT
To this input shall be connected signals that interrupt an auto reclosing cycle or
prevent a start from being accepted. Such signals can come from protection for a
line connected shunt reactor, from transfer trip receive, from back-up protection
functions, busbar protection trip or from breaker failure protection. When the
circuit breaker open position is set to start the auto recloser, then manual opening
must also be connected here. The inhibit is often a combination of signals from
external IEDs via the I/O and internal functions. An OR-gate is then used for the
combination.
MODEINT
The auto reclosing mode is selected with the ARMode setting. As an alternative to
the setting, the mode can be selected by connecting an integer, for example from
function block B16I, to the MODEINT input. The six possible modes are described
in table 6 with their corresponding MODEINT integer value. When a valid integer
is connected to the input MODEINT the selected ARMode setting will be invalid
and the MODEINT input value will be used instead. The selected mode is reported
as an integer on the MODE output.
ON and OFF
These inputs can be connected to binary inputs or to a communication interface
block for external control.
PLCLOST
This is intended for line protection permissive signal channel lost (fail) for
example, PLC= Power Line Carrier failure. It can be connected, when it is required
to prolong the auto reclosing dead time when communication is not working, that
is, one line end might trip with a zone2 delay. If this is used the auto recloser must
also be started from zone2 time delayed trip.
RESET
Used to reset the auto recloser to start conditions. Possible hold by thermal
overload protection will be reset. Circuit breaker position will be checked and time
settings will be restarted with their set times.
1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual