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A delta-delta connected transformer can continue in service with one phase removed as

  • A.an open delta or V-V connection at reduced rating
  • B.a star-star connection at full rating
  • C.a single-phase transformer at its full three-phase rating
  • D.a zigzag connection at its full rating

Answer: A

Two units can supply a three-phase load at about fifty-eight per cent of the bank's rating, which keeps supply going while the third is repaired. That resilience is one reason the connection was favoured for industrial supplies.

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