What is a common technique used to reduce core losses and the magnetising component in a current transformer? 

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SSC JE Electrical 4 Dec 2023 Official Paper II
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  1. Utilising laminated cores made of insulated sheets  
  2. Decreasing the number of windings in the secondary coil 
  3. Increasing the turns ratio of the current transformer 
  4. Using thicker core materials for better conductivity 

Answer (Detailed Solution Below)

Option 1 : Utilising laminated cores made of insulated sheets  
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Option 1, "Utilizing laminated cores made of insulated sheets," is correct.

Explanation:

  • This technique is commonly employed to reduce core losses and the magnetizing component in a current transformer.
  • Laminated cores consist of thin insulated sheets, which minimize eddy current losses by restricting the path of circulating currents within the core.
  • This design effectively reduces core heating and improves the transformer's efficiency.
  • By using laminations, the magnetic flux experiences less resistance and, as a result, the transformer exhibits lower core losses.
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