Check The Upper And Lower Busbar Voltage Limit - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
alarm, total or automatic block of the voltage control function to be displayed on the local
HMI.
3. Apply a voltage slightly below
function.
10.10.3.5

Check the upper and lower busbar voltage limit

1. Confirm the settings for
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
Vmax , 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
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
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.
10.10.3.6 Check the overcurrent block function
1. Confirm the setting for
Control/TransformerVoltageControl(ATCC,91)/TR1ATCC:x/TR8ATCC:x/TCCtrl/Iblock
2. Confirm the voltage control function response to an applied current above
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
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.
10.10.3.7 Single transformer
Load drop compensation
1. Confirm that
2. Confirm settings for
3. Calculate the expected load voltage V
based on secondary injection of transformer secondary voltage (VB =
current (I
198
Vblock and confirm the response of the voltage control
Vmin and Vmax in the local HMI under Main menu/Settings/IED
Iblock in the local HMI under Main menu/Settings/IED Settings/
Iblock setting and confirm the alarm or blocking condition is
OperationLDC is set to Enabled .
Rline and Xline .
I1Base ), in accordance with equation 113.
=
L
Vmin value and check for the corresponding
Vmax value and check for the corresponding
(displayed as a measured value on the local HMI)
L
1MRK 504 154-UUS B
SEMOD175185-588 v6
Vmin and above
SEMOD175185-605 v6
Iblock , by
SEMOD175185-669 v2
SEMOD175185-672 v5
VSet ) and rated load
Commissioning manual