ABB Relion 670 Series Technical Reference Manual page 141

1MRK 505 208-UEN B
Technical reference manual
• CtrlIncludes when logical value one of this input will include current to
zone A, or
• CtrlExcludes when logical value zero of this input will include current to
zone A
• CTRLZB, this binary input is used to control the bay CT connection to the
differential zone B. Note that the status of this binary input is considered
ONLY if the value of setting parameter ZoneSel is either
• CtrlIncludes when logical value one of this input will include current to
zone B, or
• CtrlExcludes when logical value zero of this input will include current to
zone B
• ZEROCUR, when this binary input has logical value one the bay CT current is
unconditionally forced to zero (that is, internally multiplied with zero) after the
internal delay on start timer has expired. The time delay is determined by
setting parameter tZeroCurrent. Note that the zero current value will be given
to all differential zones, including the check zone, to which this bay is
currently connected
• INVCUR, when this binary input has logical value one the bay CT current will
be inverted (that is, internally multiplied with –1) after the internal delay on
start timer has expired. The time delay is determined by setting parameter
tInvertCurrent. Note that the inverted current value will be given to all
differential zones, including the check zone, to which this bay is currently
connected. However, it shall be noted that the INVCUR input has lower
priority than the ZEROCUR input. This means that, when both of them
simultaneously have logical value one, and both timers have expired, the bay
CT current will be forced to zero.
• TRZONE, when this binary input has logical value one the trip signal will be
sent to the differential zone to which this bay is currently connected. As a
consequence all bays connected to that zone will receive the trip signal. To this
input the breaker failure protection backup trip command for this bay is
typically connected. This will insure that all breakers connected to the same
zone with the failed breaker will be tripped. Note that this tripping is not
supervised by the Check Zone operation, in application where Check Zone is
enabled.
• TRBAY, when this binary input has logical value one the output TRIP signal
from the same function block will be activated. In this way only the bay circuit
breaker is tripped. No any other breaker in the station will receive this trip
command. This input is used to give backup overcurrent trip command to the
bay CB.
Outputs
• TRIP, this binary output shall be used as dedicated three-phase trip command
to the bay circuit breaker. It will be activated when the differential zone, to
which this bay is currently connected, operates for internal fault, or in case of
breaker failure in some other bay connected to the same zone (see description
Section 5
Differential protection
135