Academics – Electro-Technology : 2017/MAR/04
Question
Q4. (a) A 400 V/110 V transformer has 3468 turns on each primary phase winding. If the volt drop in the windings are negligible, calculate the number of turns of each secondary phase winding for EACH of the following connections:
(i) Delta/delta; (5)
(ii) Delta/star; (5)
(b) Explain why the two transformers described in Q4(i) and Q4(ii) cannot be operated with their primaries and secondaries connected in parallel. (6)
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