ABB Relion 670 series - Page 891

Signal Description
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 516: 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 ( VSet ) for automatic control
The TCMYLTC or TCLYLTC (84) function blocks have an output YLTCOUT. As shown in figure 469,
this output shall be connected to the input ATCCIN and it contains 10 binary signals and 4 integer
signals:
Table 517: 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 (90) or TR8ATCC (90) that a raise command shall be executed
lowerVoltageFb Feedback to TR1ATCC (90) or TR8ATCC (90) that a lower command shall be executed
timeOutTC Setting value of tTCTimeout that tTCTimeout has timed out.
1MRK 502 066-UUS B Section 14
Control
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Technical manual