Machine-translated by Google. Questions are authored in English.
Top

Discussion

Two transformers may be operated in parallel only if they have

  • A.the same physical size and manufacturer
  • B.identical impedances to within a fraction of a per cent
  • C.the same number of cooling radiators fitted
  • D.the same voltage ratio, phase sequence and polarity

Answer: D

A ratio mismatch circulates current between them even at no load, and a polarity or phase sequence error is a short circuit. Equal per unit impedances are desirable for proportional sharing but are not an absolute requirement.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.