Types of dry type transformers

Different type of dry type transformers are:

  • Cast resin type
  • Resin Impregnated type

Cast resin type transformers are Class F glass fibre reinforced epoxy resin. It can withstand 155oC continuously. The disadvantages of cast resin type transformers is tat in the event of failure, the complete unit including HV and LV winding is to be replaced, whereas, with resin impregnated transformer, only the affected winding is required to be replaced.