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Consider the following statements regarding parallel connection of 3-phase transformers:
1) The secondary’s of all transformers must have the same phase sequence.
2) The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.
3) The primaries of all transformers must have the same magnitude of line voltage.
Which of the above statements are correct?
  • a)
    1, 2 and 3
  • b)
    1, 3 and 3 only
  • c)
    1 and 2 only
  • d)
    2 and 3 only
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following statements regarding parallel connection of 3-p...
In parallel operation of transformer, the major points are:
• The secondary’s of all transformers must have the same phase sequence.
• The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.
• The primaries of all transformers must have the same magnitude of line voltage.
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Most Upvoted Answer
Consider the following statements regarding parallel connection of 3-p...
Voltage of the transformers must be the same.
2) The turns ratio of the transformers must be the same.
3) The impedances of the transformers must be the same.
4) The transformers must have the same kVA rating.

Which of the statements are true?

The true statements are:

1) The secondary voltage of the transformers must be the same.
2) The turns ratio of the transformers must be the same.
4) The transformers must have the same kVA rating.
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Consider the following statements regarding parallel connection of 3-phase transformers:1) The secondary’s of all transformers must have the same phase sequence.2) The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.3) The primaries of all transformers must have the same magnitude of line voltage.Which of the above statements are correct?a)1, 2 and 3b)1, 3 and 3 onlyc)1 and 2 onlyd)2 and 3 onlyCorrect answer is option 'A'. Can you explain this answer?
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