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Semi-Pro Electro-Geek
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What is the vector group in power Transformer?
Depends on the transformer. Dy1 would by a common configuration: delta primary, Y secondary, and 30-degree phase lag. Rather uncommon to have a Y primary, though it is done occasionally. Secondaries can be delta or Y, but Y is more common because it is a more versatile configuration.

Why are you asking? Do you have a specific transformer in mind?
 
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