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Paralleling two transformers of different vector group would

  • A.reduce the total output available from the bank
  • B.circulate a large current because of the phase shift
  • C.simply share the load unevenly between them
  • D.have no consequence at all in practice

Answer: B

A thirty degree difference in secondary phase leaves a large voltage between the paralleled terminals, and only the winding impedances limit the resulting current. It is a fault condition rather than a poor arrangement.

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