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Question

The HV terminals of a 3-phase bank of three single-phase transformers are connected to a 3-wire, 3-phase 11 kV (line to line) system. The LV terminals are connected to a 3-phase load rated at 1000 kVA and 2200 V line-to-line. When HV is connected in Y and LV in Δ, t he voltage rating of HV winding is ______

A
4.1 kV
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B
2.2 kV
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C
11 kV
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D
6.35 kV
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Solution

The correct option is D 6.35 kV
11 kV,Y/Δ, 2.2 kV, 1000 kVA load
Rating of each transformer =10003=333.3 kVA

VPΔ=2.2 kV

VPY=113=6.35kV

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