ABB REG670 Commissioning Manual page 271

1MRK 502 073-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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/Setting group N/Control/TransformerVoltageControl(ATCC,90)/
TR8ATCC:x/ParCtrl
The general parallel arrangement of transformers are defined by setting TnRXOP
to Enabled or Disabled. The following rules are applicable on the settings
T1RXOP – T4RXOP.
If IED T1 and T2 are connected,
• T1RXOP shall be set to Enabled in instance 2 of TR8ATCC (90),
• T2RXOP shall be set to Enabled in instance 3 of TR8ATCC (90),
• T2RXOP and T3RXOP shall be set to Enabled in instance 1 of TR8ATCC
(90), and so on.
The parameter corresponding to the own IED must not be set.
T1RXOP should thus not be set in IED T1, T2RXOP not in IED
T2, and so on.
3. The lowest transformer number in the parallel group is by default set as the
Master – confirm that this is the case by reviewing the setting in the local HMI.
4. Review the settings for VDeadband (based on percentage of nominal bus voltage)
and calculate the upper (V2) and lower (V1) voltage regulation limits for which a
tap change command will be issued from the master transformer in the group.
5. Review the expected time for first (t1) and subsequent (t2) tap change commands
from the master transformer in the local HMI under Main menu/Settings/Setting
group N/Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/
TR8ATCC:x/Time/t1 and t2
6. Apply a voltage 1% below V1 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 command in the Signal Matrix in PCM600 and monitoring a positive from
this output. Confirm the timing of this command correlates with the setting t1.
7. After the issue of the raise command, confirm that all follower transformers in the
group change tap in accordance with the command issued from the master
transformer.
8. Inject a voltage V
B
deadband limit V2 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 t2.
9. Confirm that all follower transformers in the group change tap in accordance with
this command.
Testing functionality by secondary injection
for the master transformer that is 1% above the upper
Section 13
265