A 3-phase, 50 Hz, 6600 /1000 /440 Y V. transformer (HELP)
Question: A 3-phase, 50 Hz, 6600 
/1000 /440 Y V. transformer.
(i) What is the purpose of using three winding transformers?
(ii)Determine suitable numbers of turns to ensure the peak flux does not exceed 0.03 Web.
(ii) Determine the primary line current and power factor if the 1000 V winding delivers a balanced load of 100 kVA at 0.8 power factor lagging and the 440 V winding delivers a balanced load of 50 kW at unity power factor.
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