GATE EE 2017 Set 1 — Question 48
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Electrical Machines → Three-Phase Transformers → Connections & Vector Groups
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Question
A three-phase, three winding (1.1 kV/6.6 kV/400 V) transformer is energized from AC mains at the 1.1 kV side. It supplies 900 kVA load at 0.8 power factor lag from the 6.6 kV winding and 300 kVA load at 0.6 power factor lag from the 400 V winding. The RMS line current in ampere drawn by the 1.1 kV winding from the mains is ________. (Give the answer up to one decimal place.)
Correct answer
620 to 630
Solution
1.Calculate complex power for each winding:
kVA.kVA.
2.Total complex power at primary: kVA.
3.Magnitude of total power: kVA.
4.Primary line current: A.
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