ABB rec670 Applications Manual

14.5.3.3 TCMYLTC and TCLYLTC (84) general settings
SEMOD171501-150 v6
LowVoltT
ap: 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
equation 126. 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
counter that is, 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 Enabled for voltage control, and Disabled for tap position feedback
to the transformer differential protection T2WPDIF (87T) or T3WPDIF (87T).
TCMYLTC and TCLYLTC (84) Setting group
SEMOD171501-157 v3
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 tPulseDur.
Section 14 1MRK 511 401-UUS A
Control
454 Bay control REC670 2.2 ANSI
Application manual

ABB rec670 Specifications

General

Brand	ABB
Model	rec670
Category	Control Unit
Language	English