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Delta / star transformer works satisfactorily when
1. load is balanced only
2. load is unbalanced only
3. on balanced as well as unbalanced loads
4. none of the above

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Correct Answer - Option 3 : on balanced as well as unbalanced loads
  • Large unbalanced and balanced loads can be handled satisfactorily by a delta to star transformer.
  • The star-delta & delta-star connection has no problem with third harmonic components due to circulating currents in the delta.
  • It is also more stable to unbalanced loads since the delta connection partially redistributes any occurred imbalance.

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