Which type of winding is suitable for HV winding of a small transformer?

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MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper
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  1. Sandwich winding
  2. Cross-over winding
  3. Continuous disc winding
  4. Helical winding

Answer (Detailed Solution Below)

Option 2 : Cross-over winding
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MPPGCL JE Electrical Full Test 1
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Detailed Solution

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Explanation

For High Voltage (HV) winding in small transformers, the cross-over winding is most suitable because:

  • Designed for High Voltage: It effectively handles high voltages due to its structure, which reduces voltage stress.
  • Economical for Small Transformers: Cross-over winding requires minimal insulation material, making it cost-effective for small transformers.
  • Reduced Eddy Current Losses: The winding distributes the current more evenly, reducing eddy current losses.
  • Compact and Efficient: It allows for a compact coil design while maintaining good electrical performance.
     

Additional Information

  • Sandwich winding: Used in low-voltage, high-current applications like distribution transformers.
  • Continuous disc winding: Suitable for high-voltage, high-power transformers, but not typically used in small transformers.
  • Helical winding: Used for medium-voltage, high-current applications, mainly in large transformers.
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