ABB REG670 - Page 757

Signal Description
TermIsForcedMaster Activated when the transformer is selected Master in the master-follower
parallel control mode
TermIsMaster Activated for the transformer that is master in the master-follower parallel
control mode
termReadyForMSF Activated when the transformer is ready for master-follower parallel control
mode
raiseVoltageOut Order from the master to the followers to tap up
lowerVoltageOut Order from the master to the followers to tap down
Table 432: Analog signals: ATCCOUT / HORIZx
Signal Description
voltageBusbar Measured busbar voltage for this transformer
ownLoad Currim Measured load current imaginary part for this transformer
ownLoadCurrre Measured load current real part for this transformer
reacSec Transformer reactance in primary ohms referred to the LV side
relativePosition The transformer's actual tap position
voltage Setpoint The transformer's set voltage ( USet ) for automatic control
The TCMYLTC or TCLYLTC function blocks have an output YLTCOUT. As shown
in figure
356, this output shall be connected to the input ATCCIN and it contains 10
binary signals and 4 integer signals:
Table 433: Binary signals: YLTCOUT / ATCCIN
Signal
Description
tapInOperation Tap changer in operation, changing tap position
direction Direction, raise or lower, for the most recent tap changer operation
tapInHighVoltPos Tap changer in high end position
tapInLowVoltPos Tap changer in low end position
tapPositionError Error in reading of tap position ( tap position out of range, more than one step
change, BCD code error (unaccepted combination), parity fault, mA out of
range, hardware fault for example, BIM etc.)
tapChgError
This is set high when the tap changer has not carried through a raise/lower
command within the expected max. time, or if the tap changer starts tapping
without a given command.
cmdError
This is set high if a given raise/lower command is not followed by a tap position
change within the expected max. time
raiseVoltageFb Feedback to TR1ATCC or TR8ATCC that a raise command shall be executed
lowerVoltageFb Feedback to TR1ATCC or TR8ATCC that a lower command shall be executed
timeOutTC Setting value of tTCTimeout that tTCTimeout has timed out.
1MRK502052-UEN B Section 14
Control
751
Technical manual