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Transformer Oil

It is a mineral oil obtained by refining crude petroleum. It serves the following purposes:

i.            Provides additional insulation.
ii.            Carries away the heat generated in the core and coils.
iii.            Protects the paper from dirt and moisture.

The transformer oil should possess the following properties:

  1. High dielectric strength.
  2. Low viscosity to provide good heat transfer.
  3. Good resistance to emulsion.
  4. Free from inorganic acid, alkali and corrosive sulphur.
  5. Free from sludging under normal operating conditions.
  6. High flash/fire point.