ABB Relion 670 Series Applications Manual page 426

Section 15
Control
OVPartBk : Selection of action to be taken in case the busbar voltage U
RevActPartBk : Selection of action to be taken in case Reverse Action has been activated.
TapChgBk : Selection of action to be taken in case a Tap Changer Error has been identified.
TapPosBk : Selection of action to be taken in case of Tap Position Error, or if the tap changer
has reached an end position.
UVBk : Selection of action to be taken in case the busbar voltage U
UVPartBk : Selection of action to be taken in case the busbar voltage U
Umin .
15.5.3.2 TR1ATCC or TR8ATCC Setting group
General
Operation : Switching automatic voltage control for tap changer, TR1ATCC for single control
and TR8ATCC 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.
(UB) : 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
in one bay.
TotalBlock : When this setting is On the voltage control function, TR1ATCC for single control
and TR8ATCC for parallel control, is totally blocked for manual as well as automatic control.
AutoBlock : When this setting is On the voltage control function, TR1ATCC for single control
and TR8ATCC 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
USet : Setting value for the target voltage, to be set in percent of UBase .
UDeadband : Setting value for one half of the outer deadband, to be set in percent of UBase .
The deadband is symmetrical around
transformer", figure 204. In that figure
420
Q1 , Q2 and Q3 in order to make possible switching of three steps in a capacitor bank
© Copyright 2017 Hitachi Power Grids. All rights reserved
On / Off .
USet redundant.
USet , see section
"Automatic voltage control for a single
UDeadband is equal to DU. The setting is normally
1MRK 511 401-UEN Rev. K
Umax .
exceeds
B
Ublock .
falls below
B
is between Ublock and
B
SEMOD171501-22 v9
Bay control REC670
Application manual