ABB ret650 - Page 356

Table 241: 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 function blocks has an output YLTCOUT. As shown in figure 153,
this output shall be connected to the input ATCCIN and it contains 10 binary signals
and 4 integer signals:
Table 242: 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, out of range,
hardware fault for example, BIO 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 TR8ATCC that a raise command shall be executed
lowerVoltageFb Feedback to TR8ATCC that a lower command shall be executed
timeOutTC Setting value of tTCTimeout that tTCTimeout has timed out.
Table 243: Integer signals: YLTCOUT / ATCCIN
Signal
Description
tapPosition Actual tap position as reported from the load tap changer
numberOfOperations Accumulated number of tap changer operations
tapPositionMaxVolt Tap position for highest voltage
tapPositionMinVolt Tap position for lowest voltage
Section 12 1MRK 504 135-UEN A
Control
350
Technical manual