ABB Relion 670 Series Commissioning Manual page 177

1MRK 511 403-UEN Rev. K
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-earth). 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 USet 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 UDeadband (based on percentage of nominal bus voltage) and
calculate the upper (U2) and lower (U1) 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 U1 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 raise pulse command in the Signal Matrix
in PCM600 and monitoring a positive from this output.
4. After the issue of the raise command, return the applied voltage to USet (nominal value).
5. Raise the voltage 1% above the upper deadband limit U2 and wait for the issue of a lower
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 low pulse
command in the Signal Matrix in PCM600 and monitoring a positive from this output.
6. Return the applied voltage to USet.
11.10.5.4 Check the undervoltage block function
1. Confirm the setting for Ublock, nominally at 80% of rated voltage.
2. Confirm the voltage control function response to an applied voltage below Ublock, by reviewing
the setting in the local HMI under Main menu /Settings /IED Settings /Control /
TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /UVBk that
may cause an alarm, total or automatic block of the voltage control function to be displayed on
the local HMI.
3. Apply a voltage slightly below Ublock and confirm the response of the voltage control function.
11.10.5.5 Check the upper and lower busbar voltage limit
1. Confirm the settings for Umin and Umax in the local HMI under Main menu /Settings /IED
Settings /Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90,
U↕||):x /Voltage /Umax or Umin and Main menu/Settings /IED Settings/Control /TR8ATCC
(90)/TR8ATCC:n /Voltage/Umax
2. Confirm the voltage control function response to an applied voltage below Umin and above
Umax, by reviewing the settings in the local HMI under Main menu /Settings /IED Settings /
Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /
UVPartBk and Main menu /IED Settings /Control /TransformerVoltageControl(90, U↕) /
Bay control REC670
Commissioning manual
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Section 11
Testing functionality by secondary injection
SEMOD175185-562 v7
SEMOD175185-578 v7
SEMOD175185-588 v7
171