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transformer oil filtration procedure and1623 .pdf


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transformer oil filtration procedure and
Transformer oils are important for the running of transformers and are the dielectric substance
that helps in maintaining their temperature. Transformer oils ( visit here ) are vital for the proper
running and functioning of the transformers.
About Transformer Oil Filtering:
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.
The Need for Oil Filtration:
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. 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
The Quality Parameters of Transformer Oil:
The fundamental quality parameters of transformer insulating oil are:
•Dielectric Strength
•Voltage Breakdown
•Color
•Visual Inspection

•Moisture Content
•Acidity
•Flash Point
•Interfacial Tension and,
•Particles Contamination
The Oil Treatment Processes:
Mainly there are three types of oil treatment processes:
•Filtering
•Purification with Drying Process
•Regeneration or Reclamation with Degassing
The Filtering Process involves transformer oil filtering at a temperature of about 40 degree
Celsius. The process filters fine contaminated particles with the help of a filtering device.
The Purification with Drying Process heats the oil to a maximum temperature of 90 degree
Celsius and removes acidic & polar components from the transformer oil. A process of degassing
under vacuum follows.
The Regeneration or Reclamation with Degassing is similar to the Purification with Drying
Process but uses extra oxidant additives. This is the most effective method by which the oil can
be regenerated in a cost effective manner. However, the safety of the environment must be
considered before undertaking this process.
Finding the right filter for right transformers
The traditional filters like the mechanical ones are the most commonly used filters. These filters
are successful in removing dirt, debris, soot, and large contaminants. However, these are not
effective to remove the microscopic oil byproducts. In such cases, the best option is to use
electrostatic oil cleaners ( visit here ). These cleaners are much more economical and effective
too. They first draw oil from the storage reservoir and then filter it. Then they trap even
microscopic contaminants and collect them separately for their easy disposal.


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