ABB REG670 - Check the Normal Voltage Regulation Function

1. Confirm Transformer Tap Control = Enable and Transformer Voltage Control =
Enable
• Direct tap change control
Main menu/Settings/Setting Group N/Control/
TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/Operation
• Automatic transformer voltage control
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General/
Operation
• Enable Tap Command
Main menu/Settings/General settings/Control/
TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/
EnabTapCmd
While the test set is connected to the IED but no voltage is applied, the voltage
control functions will detect an undervoltage condition that may result in an
alarm or blocking of the voltage-control operation. These conditions will be
shown on the local HMI.
2. Apply the corresponding voltage
Confirm the analog measuring mode prior to undertaking secondary injection
(positive sequence, phase-to-phase, or phase-to-ground). This measuring mode is
defined in the local HMI under Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General/
MeasMode
The application of nominal voltage VSet according to set MeasMode to the IEDs
should cause the alarm or blocking condition for undervoltage to reset.
13.10.3.3 Check the normal voltage regulation function
SEMOD175185-562 v5
1. Review the settings for VDeadband (based on percentage of nominal bus voltage)
and calculate the upper (V2) and lower (V1) voltage regulation limits for which a
tap change command will be issued.
2. Review the expected time for first (t1) and subsequent (t2) tap change commands
from the voltage control function on the local HMI under Main menu/Settings/
Setting Group N/Control/TransformerVoltageControl(ATCC,90)/
TR1ATCC:x/TR8ATCC:x/Time/t1 and t2l
3. Lower the voltage 1% below V1 and wait for the issue of a Raise command from
the voltage control after the expiry of a constant or inverse time delay set by t1.
Detection of this command will involve locating the allocated binary output for a
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 261
Commissioning manual