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.
12.10.3.5
Check the upper and lower busbar voltage limit
SEMOD175185-588 v6
1.
Confirm the settings for
Umin and Umax in the local HMI under Main menu/Settings/IED
Settings/Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC: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(ATCC,90)/TR1ATCC:x/TR8ATCC:x/
UVPartBk and Main menu/IED Settings/Control/TransformerVoltageControl/
TR1ATCC:x/TR8ATCC: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
Umin 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
Umax 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.
12.10.3.6
Check the overcurrent block function
SEMOD175185-605 v6
1.
Confirm the setting for
Iblock in the local HMI under Main menu/Settings/IED Settings/
Control/TransformerVoltageControl(ATCC,91)/TR1ATCC:x/TR8ATCC: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(ATCC,91)/TR1ATCC:x/TR8ATCC: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.
12.10.3.7
Single transformer
SEMOD175185-669 v2
Load drop compensation
SEMOD175185-672 v5
1.
Confirm that
OperationLDC is set to On.
2.
Confirm settings for
Rline and Xline.
3.
Calculate the expected load voltage U
L
(displayed as a measured value on the local HMI)
based on secondary injection of transformer secondary voltage (U
B
=
USet) and rated
load current (I
L
=
I1Base), in accordance with equation
.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
215
Commissioning manual
