This document summarizes the transformer oil purification process. It discusses how transformer oils absorb impurities over time that reduce efficiency. The purification process filters out particles, dissolved gases, and water to improve the oil's electrical properties and increase the transformer's life. Regular maintenance through purification every six months is important to prevent failures from arcing, overheating and other issues. The main purification methods are filtering, purification with drying, and regeneration, with regeneration being the most effective but also requiring consideration of environmental safety.

1. Transformer Oil Purification
/ Filtration Process /
Procedure

2. In this article you will understand
transformer oil purification
process, steps and methods
involved in oil purification process.

3. 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.

4. 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.

5. 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.

7. ●Arcing
●Overheating, which reduces electrical
efficiency as well as the life of the
transformer.
●Corona Discharges
●Decrease in insulating strength of the
transformer oil

9. 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.

10. ●Dielectric Strength
●Voltage Breakdown
●Color
●Visual Inspection
●Moisture Content
●Acidity
●Flash Point
●Interfacial Tension and,
●Particles Contamination

11. •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.

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

14. Mainly there are three types
of oil treatment processes:
●Filtering
●Purification with Drying Process
●Regeneration or Reclamation
with Degassing

15. 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.

16. 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.

17. 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.

18. 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.

19. Transformer oil purification is a
process to remove sludge,
dissolved moisture and dissolved
gases from the oil.

24. PEC Registration No: 56810
NTN No: 2691105-1
021-35069031-35055416
+923212234135-03218217382
B-542, SECTOR 35/A, ZAMAN TOWN KORANGI : 4
KARACHI
info.transfotech@gmail.com
www.transfotech.com.pk
/transfotech