ABB rec670 Commissioning Manual page 169

1MRK 511 360-UEN A
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Settings/Setting group N/Control/TransformerVoltageControl(ATCC,
90)/TR1ATCC:x/TR8ATCC:x/Time/t1 and t2
6. Apply a 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 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 U
B
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 t2.
9. Confirm that all follower transformers in the group change tap in accordance
with this command.
Circulating current voltage regulation
This instruction for confirmation of circulating current voltage regulation assumes
two transformers in the parallel group. Setting confirmation through secondary
injection requires calculation of circulating currents for each transformer based on
impedance values and respective compensating factors, and is therefore more
complex for greater than two transformers.
1. Confirm that OperationPAR is set to CC for the transformers in the parallel
group.
2. For parallel operation, it is also recommended that settings be confirmed for
parallel group membership, governed 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 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, and
• T2RXOP shall be set to On in instance 1 of TR8ATCC.
If T1 - T3 are available,
• T1RXOP and 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.
for the master transformer that is 1% above the upper
Section 10
163