Pri 230D / Sec 230Y 133 ?

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Apparently often for motor drive isolation:
Jefferson Electric said:
Designed for use with motor drives, the drive isolation transformer must isolate the motor from the line and handle the added loads of the drive-created harmonics. Jefferson Electric drive isolation transformers are custom engineered for both AC adjustable frequency and DC motor drives. They are specifically designed to accommodate the electrical and mechanical stresses, regenerative current reversals and frequent short circuits inherent in severe drive duty cycles.
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Usually a drive isolation transformer. The 133v is not a useful voltage of course but being a 'Y' it has an X0 which can be grounded. If you simply made a 230D secondary you would have no practical way to ground it except to corner ground it.
Drive isolation transformer commonly are also 'K' rated and include an electrostatic shield.
 
The delta-grounded wye construction does a great job of preventing L-G currents on the secondary from being seen by the primary. This 'noise isolation' is part of the reason drive isolation transformers were often specified for drives that used SCRs in input circuit.
 
I once saw an order for switchgear that the source was supplying 228Y/132V. What I could tell from the load descriptions was that it was mainly for dimming panels at a new performing arts center.
 
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