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Assertion (A): Transformers of different vector group cannot be paralleled.

Reason (R): The phase shift between their secondaries would drive a circulating current.

Select the correct option.

  • A.A is true but R is false, there being no phase shift between groups
  • B.A is false but R is true, such transformers being freely paralleled
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A at all

Answer: C

Thirty degrees between two nominally equal voltages leaves a substantial difference across the paralleled terminals, limited only by the winding impedances. The reason is exactly why the arrangement is a fault rather than a compromise.

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