Importance of Transformer Oil

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Importance of Transformer oil

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Transformer oil

• Used in oil-filled transformers.
• It has an excellent insulating properties.
• It has both insulating and cooling properties.
• It secures the transformer from severe damages
  and losses.

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Importance of transformer oil

• It provides the chemical stability to ensures
  long lasting service.
• Transformer oil permits good transfer of heat.
• It provides high electric strength to the
  transformers.

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Type of test conducted on transformer oil
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Types of Transformer oil
Types of Transformer oil
Paraffin Transformer oil
Naphtha transformer oil
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Naphtha transformer oil

• Easily get oxidized than Paraffin oil.
• Oxidation product has made i.e. the sludge which
  is more soluble in naphtha than paraffin oil.
• The sludge made in naphtha oil does not
  precipitate at the bottom of the transformer,
  thus it does not obstruct the transformer to work
  efficiently.

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Paraffin transformer oil

• Oxidation of paraffin oil is low as compared to
  naphtha oil.
• The pour point of paraffin oil is high due to the
  presence of wax content in it.
• The sludge made in paraffin oil is insoluble
  which obstruct the cooling system of transformer.

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Parameters to choose the best transformer oil

• Chemical Parameters includes Sludge content,
  Acidity, and Water Content
• Electrical Parameters includes Dielectric
  Strength, Specific Resistance, and Dielectric
  Dissipation Factor.
• Physical Parameters includes viscosity, Flash
  point, inter facial tension, and pour point.

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Chemical Parameter

•  Acidity  Acidity reduces the insulation of
  paper insulation in winding. Acidity is the most
  deleterious property of transformer oil . Acid
  causes rust on iron when it comes in the contact
  of moisture.
•  Water Content The Water content, which presents
  in transformer oil affects the dielectric
  properties of oil and besides also influence the
  paper.

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Electrical Parameters

• Specific resistance It is the measure of direct
  current resistance between two opposite sides of
  one cu. Cm of oil.
• Dielectric Strength Dielectric strength is the
  measure of the breakdown voltage of transformer
  oil.
• Dielectric dissipation Factor It is also called
  as loss factor or Tan Delta of Transformer Oil

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Physical Parameters

• Flash Point of transformer Oil Flash point
  indicates the value of temperature at which the
  air get mixed up with the vapours of oil and
  comes up with the inflammable mixture. The
  temperature is normally more than 140deg. C.
• Inter Facial Tension The inter facial tension
  indicates the molecular attractive force between
  oil and water.
• Viscosity of Transformer Oil It is defined
  as obstruction of flow of oil at normal
  condition. It is the restriction of convection of
  oil inside the transformer. The transformer oil
  should be of low viscosity so that it shows the
  minimum hurdle to the flow of oil.