PID-6506-MONITOREDDATA v3
Table 541: TCMYLTC (84) Monitored data
Name Type Values (Range) Unit Description
TCPOS INTEGER - - Integer value corresponding to actual tap
position
PID-3669-MONITOREDDATA v2
Table 542: TCMYLTC (84) Monitored data
Name Type Values (Range) Unit Description
CNT_VAL INTEGER - - Number of operations on tap changer
CLCNT_VAL REAL - - Remaining number of operations at rated
load
TCPOS INTEGER - - Integer value corresponding to actual tap
position
PID-3668-MONITOREDDATA v4
Table 543: TCLYLTC (84) Monitored data
Name Type Values (Range) Unit Description
TCPOS INTEGER - - Integer value corresponding to actual tap
position
14.4.10 Operation principle
M6500-430 v7
The voltage control function is built up by two function blocks. Both are logical nodes in IEC
61850-8-1.
• Automatic voltage control for tap changer
• TR1ATCC (90) for single control
• TR8ATCC (90) for parallel control
• Tap changer control and supervision
• TCMYLTC (84), 6 binary inputs
• TCLYLTC (84), 32 binary inputs
TR1ATCC (90)and TR8ATCC (90) are designed to automatically maintain the voltage at the LV-side
side of a power transformer within given limits around a set target voltage. A raise or lower
command is generated whenever the measured voltage, for a given period of time, deviates from
the set target value by more than the preset deadband value that is, degree of insensitivity. A
time-delay (inverse or definite time) is set to avoid unnecessary operation during shorter voltage
deviations from the target value, and in order to coordinate with other automatic voltage
controllers in the system.
TCMYLTC (84) and TCLYLTC (84) are an interface between TR1ATCC (90) and TR8ATCC (90) and
the transformer load tap changer. More specifically this means that it receives information from
TR1ATCC (90) or TR8ATCC (90) and based on this it gives command-pulses to a power transformer
motor driven on-load tap changer and also receives information from the load tap changer
regarding tap position, progress of given commands, and so on.
Section 14 1MRK 502 066-UUS B
Control
904
Technical manual
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