Section 13
Control
the Automatic voltage control for tap changer, parallel control TR8ATCC (90) function block of the
follower will be activated after the time delay
tMFPosDiff : Time delay for activation of the output OUTOFPOS.
13.5.3.3
TCMYLTC and TCLYLTC (84) general settings
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
LowVoltTap : This gives the tap position for the lowest LV-voltage.
HighVoltTap : This gives the tap position for the highest LV-voltage.
mALow : The mA value that corresponds to the lowest tap position. Applicable when reading of the
tap position is made via a mA signal.
mAHigh : The mA value that corresponds to the highest tap position. Applicable when reading of
the tap position is made via a mA signal.
CodeType : This setting gives the method of tap position reading.
UseParity : Sets the parity check Enabled / Disabled for tap position reading when this is made by
Binary, BCD, or Gray code.
tStable : This is the time that needs to elapse after a new tap position has been reported to
TCMYLTC until it is accepted.
CLFactor : This is the factor designated "a" in
nominal load current (current measured on the HV-side), the ContactLife counter decrements with
1, irrespective of the setting of
deviation with respect to the load current.
InitCLCounter : The ContactLife counter monitors the remaining number of operations
(decremental counter). The setting
the total number of operations at rated load that the tap changer is designed for.
EnabTapCmd : This setting enables/disables the lower and raise commands to the tap changer. It
shall be
differential protection T2WPDIF (87T) or T3WPDIF (87T).
TCMYLTC and TCLYLTC (84) Setting group
General
Operation : Switching the TCMYLTC or TCLYLTC (84) function Enabled / Disabled .
IBase : Base current in primary Ampere for the HV-side of the transformer.
tTCTimeout : This setting gives the maximum time interval for a raise or lower command to be
completed.
tPulseDur : Length of the command pulse (VRAISE/VLOWER) to the tap changer. It shall be noticed
that this pulse has a fixed extension of 4 seconds that adds to the setting value of
372
CLFactor . The setting of this factor gives the weighting of the
Enabled for voltage control, and Disabled for tap position feedback to the transformer
tMFPosDiff .
equation
130. When a tap changer operates at
InitCLCounter then gives the start value for the counter that is,
1MRK 511 358-UUS A
SEMOD171501-150 v7
SEMOD171501-157 v3
tPulseDur .
Application manual