ABB Relion REC670 Applications Manual page 255

1MRK 511 358-UEN A
breaker failure protection. When the CB open position is set to start SMBRREC, then manual
opening must also be connected here. The inhibit is often a combination of signals from
external IEDs via the IO and internal functions. An OR gate is then used for the combination.
CBPOS and CBREADY
These should be connected to binary inputs to pick-up information from the CB. The CBPOS
input is interpreted as CB Closed, if parameter
default setting. At three operating gears in the breaker (single pole operated 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) if the
The "CB Ready" is a signal meaning that the CB is ready for a reclosing operation, either Close-
Open (CO), or Open-Close-Open (OCO). If the available signal is of type "CB not charged" or
"not ready", an inverter can be inserted in front of the CBREADY input.
SYNC
This is connected to the internal synchrocheck function when required. It can also be
connected to a binary input for synchronization from an external device. If neither internal nor
external synchronism or energizing check is required, it can be connected to a permanently
high source, TRUE. The signal is required for three phase shots 1-5 to proceed (Note! Not the
HS step).
PLCLOST
This is intended for line protection permissive signal channel lost (fail) for example, PLC=
Power Line Carrier fail. It can be connected, when required to prolong the AutoReclosing time
when communication is not working, that is, one line end might trip with a zone 2 delay. If this
is used the autorecloser must also be started from Zone2 time delayed trip.
TRSOTF
This is the signal "Trip by Switch Onto Fault". It is usually connected to the "switch onto fault"
output of line protection if multi-shot Auto-Reclose attempts are used. The input will start the
shots 2-5.
THOLHOLD
Signal "Thermal overload protection holding back Auto-Reclosing". It can be connected to a
thermal overload protection trip signal which resets only when the thermal content has fallen
to an acceptable level, for example, 70%. As long as the signal is high, indicating that the line is
hot, the Auto-Reclosing is held back. When the signal resets, a reclosing cycle will continue.
Please observe that this have a considerable delay. Input can also be used for other purposes if
for some reason the Auto-Reclose shot need to be halted.
TR2P and TR3P
Signals for two-phase and three-phase trip. They are usually connected to the corresponding
output of the TRIP block. They control the choice of dead time and the reclosing cycle
according to the selected program. Signal TR2P needs to be connected only if the trip has been
selected to give 1/2/3 phase trip and an auto reclosing cycle with two phase reclosing is
foreseen.
WAIT
Used to hold back reclosing of the "low priority unit" during sequential reclosing. See
"Recommendation for multi-breaker arrangement" below. The signal is activated from output
WFMASTER on the second breaker Auto-Recloser in multi-breaker arrangements.
Application manual
CBAuxContType is set NormOpen , which is the
CBAuxContType is set to NormClosed .
Section 13
Control
249