Transformer RG

Transformer oil or insulating oil is usually highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. The functions of these transformer oil are to insulate, supress corona and arcing as well as to serve as a coolant.

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Transformer oil is used in:

  • oil-filled transformers,
  • some types of high voltage capacitors,
  • fluorescent lamp ballasts of high voltage switches and
  • circuit breakers.


  • Transformer oil helps cool the transformer.
  • Transformer oil must remain stable at high temperatures for an extended period because it also provides part of the electrical insulation between internal live parts.
  • The oil-filled tank may have external radiators through which the transformer oil circulates by natural convection to improve cooling of large power transformers.


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