Check The Activation Of The Voltage Control Operation; Check The Normal Voltage Regulation Function - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
When the load voltage V
If V < V1 or V
L
setting t1 and t1Use. The command timer will trip while the measured voltage stays outside the inner
deadband (defined by setting VDeadbandInner).
If V remains outside of the voltage range defined by VDeadband and the command timer expires, the
L
voltage control will execute a raise or lower command to the transformer tap changer. This command
sequence will be repeated until V
11.10.5.2

Check the activation of the voltage control operation

1. Confirm Transformer Tap Control = Enable and Transformer Voltage Control = Enable
•
Main menu /Settings /IED Settings /Control /TransformerTapChanger(84,⇅) /
TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /Operation
•
Main menu /Settings /IED Settings /Control /TransformerVoltageControl(90,↕) /TR1ATCC(90,
U↕):x/TR8ATCC(90, U↕||):x /General /Operation
•
Main menu /Settings /IED Settings /Control /TransformerTapChanger(84,⇅) /
TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):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 /IED Settings /Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90,
U↕):x/TR8ATCC(90, U↕||):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.
11.10.5.3

Check the normal voltage regulation function

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 /IED Settings /Control /
TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /Time /t1 and t2
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
180
Note that when LDC is disabled, V
stays within the interval between V1 and V2, no action will be taken.
L
> V2, a command timer will pickup, which is constant time or inverse time defined by
L
is brought back within the inner deadband range.
L
Direct tap change control
Automatic transformer voltage control
Enable Tap Command
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