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Main Aspects of Retrofitting / Replacement of Transformer Bushings

  • Oct 14, 2025
  • 1 min read
Main Aspects of Retrofitting / Replacement of Transformer Bushings

Transformer bushings are crucial components that ensure the safe transfer of electrical energy between transformer winding leads and transmission line. Replacing/retrofitting existing or faulty bushings is extremely critical for transformer. The decision to retrofit or replace a bushing depends on various technical and operational factors.


Reasons for Retrofitting/Replacement of Transformer Bushings (SRBP/OIP replaced by OIP/RIP/RIS)


  • Increase in capacitance and Tan Delta beyond limits.

  • Oil leakage in OIP bushings.

  • Physical damage.

  • Lack of adequate quantity of spare bushing at site and criticality of transformer location.

  • Ageing phenomena.

  • Adoption of composite/polymer insulators instead of porcelain for improved mechanical strength and shatter resistance.

  • Customized solutions that fit into the existing transformer design without requiring transformer tank modifications.


Main Considerations for Retrofitting & Replacement of Transformer Bushings


  • Air-end dimensions required for existing bushing.

Air-end dimensions required for existing bushing.

  • Oil-end dimensions required for existing bushing.

Oil-end dimensions required for existing bushing.



 
 
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