Main menu/Settings/General 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/Setting Group N/
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.
10.9.4.3
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/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
.
10.9.4.4
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/
1MRK 511 360-UEN A
Section 10
Testing functionality by secondary injection
Bay control REC670 2.1 IEC
159
Commissioning manual
