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
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
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