Open-delta or V-V Connection of a Transformer
A V-V connection uses two single-phase transformers to produce a three-phase output.
Here is one possible connection with phase displacement:
Power Supplied by V-V Bank Transformer |
The main advantage of a V-V is a reduction in the cost of equipment and physical construction space for applications where the power demand is relatively light.
Why do V-V Bank Connection?
Picture a delta-delta connected three-phase transformer, then picture one of the three-phase windings removed. That is a V-V connected transformer.
This connection saves some money on the transformer since it has one less phase winding but at a cost of degrading the KVA rating and creating a phase imbalance.
It may happen that due to some reason, one of the transformers is removed; like maintenance, damage, faults etc. In such a case, the second delta is broken and the connection resembles a V.
Hence this sort of connection is also known as V-V connection or Open-delta connection.
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