Completing The Test - ABB Relion 670 Series Commissioning Manual

1MRK 511 403-UEN E
7. Manually execute Raise commands to step up the tap changer one step for all
transformers in the parallel group
8. Check that the value of
the undervoltage blocking level
9. Set the control mode to
The Master in the parallel group will issue a Lower command after time delay t1, which
will also be repeated by the Follower transformers in the group.
10. Set Transformer 2 to Master of the parallel group and T1 to Follower (in that order) and
repeat steps 7 to 10. Undertake this same test by setting each Transformer in turn to
Master
11. Note that voltage regulation will be mutually blocked if no transformer is set to Master in
the parallel group. To confirm this function, set T1 as Master and the other transformers
in the parallel grouper set as Follower. Without allocating a new Master, set T1 to
Follower and note the
12. Restore T1 to Master of the parallel transformer group and ensure that control mode for
each transformer is
12.1.5

Completing the test

After the test is completed and relevant disturbance records are saved to document the test,
go to Main menu/Clear on the local HMI and clear all LEDs, the process eventlist and
disturbances from the IED.
Bay control REC670
Commissioning manual
IEC13000252-1-en.vsd
BUSVOLT is below overvoltage blocking level OVPartBK and above
UVPartBK .
Auto for each transformer in the parallel control group
Automatic block state on the local HMI for all parallel transformers
Automatic .
© Copyright 2017 ABB. All rights reserved
Section 12
Primary injection testing
SEMOD176327-287 v3
193