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A 200 kVA single phase transformer with a voltage ratio of 6600/660 V has following winding resistances:

R1 = 1.75 Ω and R2 = 0.015 Ω

Find the resistance referred to the high voltage winding.

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HPCL Engineer Electrical 11 Aug 2021 Official Paper
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  1. 1.90 Ω
  2. 1.60 Ω
  3. 16.75 Ω
  4. 3.25 Ω

Answer (Detailed Solution Below)

Option 4 : 3.25 Ω
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Detailed Solution

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Concept:

The equivalent resistance from the primary side when the secondary resistance is transferred towards the primary side is:

Also, 

Calculation:

Given, V1 = 6600 V and V2 = 660 V

R1 = 1.75 Ω  and R2 = 0.015 Ω 

Req = 3.25 Ω 

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