Transformer Oil Filtration

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Transformer Oil

Transformer oil is a very important for the functional transformers and are the dielectric substance that helps in maintaining their temperature. Transformer oils are vital for the proper running and functioning of the transformers. It is one of the main asset in the electrical power industry which needs to be maintained for guaranteed uninterrupted power transmission in order to get assured revenue benefits.

Transformer oil filtration:

Transformers require filtered and dried oil. During its usage, the insulating oil absorbs moisture and gets polluted by sopping fibers, dirty particles, aging products, and soot. Even unused oil is not clean enough as it may have absorbed moisture from the air or may have got polluted in the barrel it was stored in. The efficiency of the oil as an insulating material is highly reduced as the moisture level increases.
Hence, transformer oil filtering is an important process which eliminates solid particles, dissolved gasses, and dissolved water. The electrical properties of the oil can be enhanced by filtering, dehydration, and degassing. Oil Filtering keeps the transformer in good condition and increases its life.

Why oil filtration is important?

Higher rating requirements of modern transformers and electrical apparatus results in greater electrical stress in insulating material and fluids. In order to handle these greater stresses, oils are required to have better dielectric strength, and lower residual water content must be maintained. Oil filtration will result in the improvement of the properties of the entire insulating system of power transformers. The principal functions of the transformer oil is to serve as a dielectric material and for effective cooling. To perform these functions, the transformer oil must have specific necessary qualities at the time of initial impregnation and filling at the factory which must be maintained at the same quality level in field operation if optimum performance is to be assured. Almost 75 percent of the transformer failures happen due to contaminated and deteriorated oil. It is important to filter the transformer oil. Regular maintenance is of utmost significance as it is a great financial burden to replace or repair the transformer.

What will happen if oil filtration not done regularly?

Ignoring transformer oil filtering can lead to:
  • Arcing
  • Overheating, which reduces electrical efficiency as well as the life of the transformer
  • Corona Discharges
  • Decrease in insulating strength of the transformer oil, and more.

Advantages for transformer oil filtration:

  • Improved insulation properties of the oil.
  • Better the insulation of transformer, longer the life of the transformer and lesser the breakdown of the transformer.
  • Longer the life of the transformer asset, good returns on investment of the asset
  • Lesser breakdowns and failure of the transformer results in uninterrupted power supply
Dipashri Patil 

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