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Transformer Overhauling

September 10, 2010

Transformer Overhauling – The basic meaning of Overhauling is to examine or go over carefully for needed repairs. In the process of Overhauling Engineers open the whole Transformer to do the needful cleaning, repair and replacement, in short the process includes overall inspection including lifting of core and coils.

Transformer Overhauling, Leakage Arresting & Elect. Testing

  • Dismantling of Transformer & Draining of Oil
  • Lifting, Cleaning and Tightening of Core & Coil Assemblytransformer maintenance
  • Gasket Replacement
  • Nitrogen Purging
  • IR Value Improvement by High Vacuum Oil Circulation
  • Winding Insulation Paper Measurement of DP for  RLA
  • Initial & Pre-Commissioning Testing
  • Winding Resistance
  • Turn Ratio Test
  • No Load/ Load Losses
  • Tan Delta & Capacitance Tests on Bushing & winding

Duration of Work:

  • After every 5 yrs for 1000 to 3000 KVA
  • After every 7-10 yrs for 3000 and above KVA


  • Increase IR Value
  • Increases 10 times age of your Transformer
  • Reduce maintenance expenses
  • Improve Transformer reliability
  • Reduce unnecessary repair/replacement costs
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