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Transformer Insulation includes, Transformer Oil in the Main Tank and Transformer Winding Insulation.

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Transformer Oil:

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Function:

It is a Mineral Insulating Oil/Liquid Dilectric which provides following Functions:

  1.  Provides Insulation Between Core, Winding and the tank.
  2. Provides Cooling
  3.  Its Hygroscopic nature is useful in absorbing moisture from the Winding Insulation. 
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    Factors affecting deterioration:

    1.  Voltage transients due to Faults.
    2. Heat due to Overlapping/ improper Cooling.
    3. Filling/topping up operation.
    4. Chemical Reation
    5. Moisture due to leakages and breathing action.
    6. Dirt due to improper breathing action
    7. Ageing of Solid and Liquid Insulation
    8. Oxygen.
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      Corrective Actions:

      1. Filteration/reconditioning.
      2. Reclamation
      3. Re-fining
      4. Replacement.
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        Corona Fault results in :

        1. Hydrogen
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          Transformer Oil:

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          Function:

          It is a Solid Insulation of Cellulose material which provides following Functions:

          1. It prevents the shorting of the two windings.
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            Factors affecting deterioration:

            1.  Cellulose degradation, which gives rise to gasses.
            2. Polymerisation of Cellulose.
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              Corrective Actions:

              1. Rewinding
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                Corona Fault results in :

                1. Hydrogen
                2. Carbon Momoxide
                3. Carbon Dioxide
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                  Please note that same Switch is also availabe in Circuit Breaker for Local Closing and Tripping.

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