Check The Undervoltage Block Function; Check The Upper And Lower Busbar Voltage Limit; Check The Overcurrent Block Function - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UUS Rev. J
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 VSet.
11.11.5.4

Check the undervoltage block function

1. Confirm the setting for Vblock, nominally at 80% of rated voltage.
2. Confirm the voltage control function response to an applied voltage below Vblock, 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 Vblock and confirm the response of the voltage control function.
11.11.5.5

Check the upper and lower busbar voltage limit

1. Confirm the settings for Vmin and Vmax 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 Vmin and above Vmax,
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↕) /TR1ATCC(90, U↕):x/
TR8ATCC(90, U↕||):x /OVPartBk. These conditions may cause an alarm or total block of the
voltage control function to be displayed on the local HMI.
3. Decrease the injected voltage slightly below the Vmin value and check for the corresponding
blocking or alarm condition on the local HMI. For an alarm condition, the voltage regulation function
is not blocked and a raise command should be issued from the IED.
4. Increase the applied voltage slightly above the Vmax value and check for the corresponding
blocking or alarm condition on the local HMI. For an alarm condition, the voltage regulation function
is not blocked and a lower command should be issued from the IED.
11.11.5.6

Check the overcurrent block function

1. Confirm the setting for Iblock in the local HMI under Main menu /Settings /IED Settings /Control /
TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /TCCtrl /Iblock
2. Confirm the voltage control function response to an applied current above Iblock, 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 /OVPartBk. This
condition may cause an alarm or total block of the voltage control function to be displayed on the
local HMI.
3. Inject a current higher than the Iblock setting and confirm the alarm or blocking condition is present
on the local HMI. If an automatic or total blocking condition occurs, change the applied secondary
voltage and confirm that no tap change commands are issued from the associated binary outputs.
This situation can also be confirmed through reviewing the disturbance and service reports on the
local HMI.
Transformer protection RET670
Commissioning manual
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Section 11
Testing functionality by secondary injection
SEMOD175185-578 v7
SEMOD175185-588 v7
SEMOD175185-605 v7
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