ABB TCC300, User Manual, Page: 594 / 716

Place the desired settings on the controls and set all controls to Automatic.
9.11.2 Performing three transformer verification
1. Verify that the individual controls to be included in the Peer to Peer configuration
have been tested in the independent mode of operation.
2. Verify that Peer to Peer (P2P) DeltaVar has been configured in each control and they
are ready to be tested.
3. Place all the transformers to be paralleled in Manual mode to keep them from
responding to tap change requests.
4. Place all the transformers to be paralleled on the same tap position so that the
regulated voltage is near the band center setting.
5. For this verification, assume that the following system conditions exist:
•
All the transformers are the same.
• The high side sources are all connected together.
• There is only one high side source for the paralleled transformers.
6. If the high side sources are connected together, then verify that the DeltaVar current
in all the transformers is near zero.
7. If the high side sources are not connected together, then it may be necessary to adjust
the tap positions to obtain a zero DVAR current, or the minimum value possible.
Record the difference in the tap positions, for example Transformer 1 may be two
taps higher then Transformer 2 with Transformer 3 one tap lower than Transformer
2.
Write down the Tap Position Difference.
8. Manually raise Transformer 1, one or two taps.
9. Manually lower Transformer 2 and 3, one or two taps, then observe the following:
•
The regulated voltage should still be in band near the center of the band width.
• The DVAR current on Transformer 1 should lagging
• The DVAR current on Transformers 2 and 3 should be leading
• The DVAR current on Transformer 1 will have twice the magnitude of
Transformers 2 and 3
• The DVAR current on Transformers 2 and 3 should both have the same
magnitude
10. Verify that Transformer 1 is calling for a lower and Transformers 2 and 3 are calling
for a raise.
11. If all transformers are not calling for a tap change operation, then manually increase
the tap position difference between the transformers by raising Transformer 1, one
Section 9
1VAC388793-MB A
Testing
588 TCC300
User Manual