Tr1Atcc (90) Or Tr8Atcc (90) Setting Group - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
13.5.3.2

TR1ATCC (90) or TR8ATCC (90) Setting group

General
Operation : Switching automatic voltage control for tap changer, TR1ATCC (90) for single control
and TR8ATCC (90) for parallel control function
(IB1) : Base current in primary Ampere for the HV-side of the transformer.
(IB2) : Base current in primary Ampere for the LV-side of the transformer.
(VB) : Base voltage in primary kV for the LV-side of the transformer.
MeasMode : Selection of single phase, or phase-phase, or positive sequence quantity to be used for
voltage and current measurement on the LV-side. The involved phases are also selected. Thus,
single phase as well as phase-phase or three-phase feeding on the LV-side is possible but it is
commonly selected for current and voltage.
Q1 , Q2 and Q3 : Mvar value of a capacitor bank or reactor that is connected between the power
transformer and the CT, such that the current of the capacitor bank (reactor) needs to be
compensated for in the calculation of circulating currents. There are three independent settings
Q1 , Q2 and Q3 in order to make possible switching of three steps in a capacitor bank in one bay.
TotalBlock : When this setting is Enabled the voltage control function, TR1ATCC (90) for single
control and TR8ATCC (90) for parallel control, is totally blocked for manual as well as automatic
control.
AutoBlock : When this setting is Enabled the voltage control function, TR1ATCC (90) for single
control and TR8ATCC (90) for parallel control, is blocked for automatic control.
Operation
FSDMode : This setting enables/disables the fast step down function. Enabling can be for
automatic and manual control, or for only automatic control alternatively.
tFSD : Time delay to be used for the fast step down tapping.
Voltage
UseCmdUSet : This setting enabled makes it possible to set the target voltage level via IEC 61850
set point command. This, in turn, makes the setting
VSet : Setting value for the target voltage, to be set in percent of VBase .
VDeadband : Setting value for one half of the outer deadband, to be set in percent of VBase . The
deadband is symmetrical around
transformer", figure 164. In that figure
to a value near the power transformer's tap changer voltage step (typically 75 - 125% of the tap
changer step).
VDeadbandInner : Setting value for one half of the inner deadband, to be set in percent of VBase .
The inner deadband is symmetrical around
single transformer",figure 164. In that figure
smaller than
value.
Application manual
VSet , see section
VDeadband . Typically the inner deadband can be set to 25-70% of the VDeadband
Enabled / Disabled .
USet redundant.
"Automatic voltage control for a single
VDeadband is equal to DV. The setting is normally selected
VSet , see section
"Automatic voltage control for a
VDeadbandInner is equal to DV
Section 13
Control
SEMOD171501-22 v9
. The setting shall be
in
365