Transformer Oil Purification / Filtration Process /

Procedure

In this article you will understand

transformer oil purification

process, steps and methods

involved in oil purification process.

Transformer oils are important for the

running of transformers winding and are

the dielectric substance that helps in

maintaining their temperature.

Transformer oils are vital for the

proper running and functioning

of the transformers.

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.

Almost 75 percent of the transformer

failures happen due to contaminated and

deteriorated oil.

It is important to filter the transformer oil.

Regular maintenance (each 6 months) is

of utmost significance as it is a great

financial burden to replace or repair the

transformer.

●Arcing

●Overheating, which reduces electrical

efficiency as well as the life of the

transformer.

●Corona Discharges

●Decrease in insulating strength of the

transformer oil

An alternate method used for dirt

separation from oil is centrifuge.

Routine transformer oil filtration or transformer oil

conditioning is often confused with transformer oil

centrifuging.

Transformer oil centrifuging is all together a different

technology and has a little impact on improving the oil

parameters.

Centrifuges used for separation of dirt from the

transformer oil can be slow speed type centrifuges

that do not require additional electric motor to spin the centrifuge cone at high speed.

●Dielectric Strength

●Voltage Breakdown

●Color

●Visual Inspection

●Moisture Content

●Acidity

●Flash Point

●Interfacial Tension and,

●Particles Contamination

•Improved insulation properties of the oil and hence the other media like paper/cellulose insulation. •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.

At Transfo Tech. Engineering, we use Oil purification machines with International prescribed Standards (BIS, NEMA, IEEE, IEE, ASTM, ASME, IEC) for good performance of transformer.

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 60 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.

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.

At Transfo Tech. Engineering,

we understand the requirements of the

oil filtration and are committed for

resulting a good transformer

performance. Feel free to contact

us, we shall be happy to help you and provide you a quick response.

Transformer oil purification is a

process to remove sludge,

dissolved moisture and dissolved

gases from the oil.

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