1.
Confirm
Transformer Tap Control = On and Transformer Voltage Control = On
•
Direct tap change control
Main menu/Settings/IED Settings/Control/TransformerTapChanger(YLTC,84)/
TCMYLTC:x/TCLYLTC:x/Operation
•
Automatic transformer voltage control
Main menu/Settings/IED Settings/Control/TransformerVoltageControl(ATCC,90)/
TR1ATCC:x/TR8ATCC:x/General/Operation
•
Enable Tap Command
Main menu/Settings/IED 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-earth). This measuring mode is defined in the
local HMI under Main menu/Settings/IED Settings/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC: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.
12.10.3.3
Check the normal voltage regulation function
SEMOD175185-562 v5
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/Setting Group
N/Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/Time/t1 and
t2l
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.
12.10.3.4
Check the undervoltage block function
SEMOD175185-578 v6
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(ATCC,90)/TR1ATCC:x/TR8ATCC:x/UVBk that may cause an
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
214
Commissioning manual
