Check The Normal Voltage Regulation Function; Check The Undervoltage Block Function; Check The Upper And Lower Busbar Voltage Limit - ABB ret650 Commissioning Manual

1MRK 504 126-UEN -
6.7.1.3
6.7.1.4
6.7.1.5
Commissioning Manual

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/TR8ATCC (90)/1:TR8ATCC/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.

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/TR8ATCC (90)/1:TR8ATCC/General/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.

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//TR8ATCC (90)/n:TR8ATCC/Voltage/
Umin and Main menu/Settings/IED Settings/Control/TR8ATCC (90)/
n:TR8ATCC/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/TR8ATCC (90)/n:TR8ATCC/
Section 6
Testing functionality
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