Check The Overcurrent Block Function; Automatic Voltage Control For Tap Changer, Parallel Control Tr8Atcc - ABB ret650 Commissioning Manual

Section 6
Testing functionality
6.7.1.6
6.7.1.7
70
General/UVPartBk and Main menu/Settings/IED Settings/Control/
TR8ATCC (90)/n:TR8ATCC/General/OVPartBk.
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.

Check the overcurrent block function

1. Confirm the setting for Iblock in the local HMI under Main menu/Settings/
IED Settings/Control/TR8ATCC (90)/n:TR8ATCC/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/TR8ATCC (90)/n:TR8ATCC/General/OCBk.
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.

Automatic voltage control for tap changer, parallel control TR8ATCC

Master follower voltage regulation
1. For the transformers connected in the parallel group, confirm that
OperationPAR is set to MF.
2. For parallel operation, it is also recommended to confirm for parallel group
membership, defined by setting TnRXOP in the local HMI under Main menu/
Settings/IED Settings/Control/TR8ATCC (90)/n:TR8ATCC/ParCtrl
The general parallel arrangement of transformers are defined by setting
TnRXOP to On or Off. The following rules are applicable on the settings
T1RXOP – T4RXOP.
If IED T1 and T2 are connected,
• T1RXOP shall be set to On in instance 2 of TR8ATCC,
• T2RXOP shall be set to On in instance 3 of TR8ATCC,
• T2RXOP and T3RXOP shall be set to On in instance 1 of TR8ATCC,
and so on.
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Commissioning Manual