ABB RET670 Applications Manual page 703

1MRK504116-UUS C
Application manual
T1RXOP.......T8RXOP: This setting is set Enabled for every transformer that can
participate in a parallel group with the transformer in case. For this transformer (own
transformer), the setting must always be Disabled.
TapPosOffs: This setting gives the tap position offset in relation to the master so that
the follower can follow the master's tap position including this offset. Applicable when
regulating in the follow tap command mode.
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.
tMFPosDiff: Time delay for activation of the output OUTOFPOS.
Transformer name
TRFNAME: Non-compulsory transformer name. This setting is not used for any
purpose by the voltage control function.
TCMYLTC and TCLYLTC (84) general settings
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 equation431. When a tap changer
operates at nominal load current(current measured on the HV-side), the ContactLife
counter decrements with 1, irrespective of the setting of CLFactor. The setting of this
factor gives the weighting of the deviation with respect to the load current.
InitCLCounter: The ContactLife counter monitors the remaining number of operations
(decremental counter). The setting InitCLCounter then gives the start value for the
Section 3
IED application
697