ABB Relion 670 Series Applications Manual page 404

Section 14
Control
MFPosDiffLim : When the difference (including a possible offset according to TapPosOffs )
between a follower and the master reaches the value in this setting, then the output OUTOFPOS in
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.
14.5.3.3 TCMYLTC and TCLYLTC (84) general settings
Common base IED values for the primary current (
SBase ) are set in global base values for settings function GBASVAL.
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
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.
398
CLFactor . The setting of this factor gives the weighting of the
Enabled for voltage control, and Disabled for tap position feedback to the transformer
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tMFPosDiff .
IBase ), primary voltage ( VBase ) and primary
equation 131. When a tap changer operates at
InitCLCounter then gives the start value for the counter that is,
1MRK 511 401-UUS F
SEMOD171501-150 v7
SEMOD171501-157 v3
Bay control REC670
Application manual