Completing The Test - ABB RET670 Commissioning Manual

Section 12
Primary injection testing
12.1.5
282
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 BUSVOLT is below overvoltage blocking level
OVPartBK and above the undervoltage blocking level UVPartBK.
9. Set the control mode to Auto for each transformer in the parallel control group
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 Automatic block
state on the local HMI for all parallel transformers
12. Restore T1 to Master of the parallel transformer group and ensure that control
mode for each transformer is Automatic.

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.
1MRK 504 165-UEN A
IEC13000252-1-en.vsd
Transformer protection RET670 2.2 IEC
Commissioning manual
SEMOD176327-287 v3