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Transformer connections of two three phase transformers are given in the options. Which of the pair is not suitable for the parallel operation.
  • a)
     ∆/∆, Y/Y
  • b)
     ∆/Zig Zag Y, Y/Y
  • c)
     ∆/Y, Y/∆
  • d)
     Y/Zig Zag Y, Y/Y
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Transformer connections of two three phase transformers are given in t...
For the parallel operation, phase displacement angle between secondaries of both transformers must be zero. That means both the transformers must belong to same phase group.

In the given options,
Y/Zig Zag Y and Y/Y belongs to different phasor groups. Hence this pair is not suitable for parallel operation.
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Transformer connections of two three phase transformers are given in the options. Which of thepair is not suitable for the parallel operation.a)∆/∆, Y/Yb)∆/Zig Zag Y, Y/Yc)∆/Y, Y/∆d)Y/Zig Zag Y, Y/YCorrect answer is option 'D'. Can you explain this answer?
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