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transformer oil purification a1750 .pdf


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transformer oil purification a
Oils used in large quantities inside transformers are insulating oils or simply transformer oils (
click here ). They can maintain their stability at extremely high temperatures and also have
significant electrical insulating characteristics. Due to their high temperature stability and excellent
insulating property, they have been used in transformers over the years. Apart from transformers,
high voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and
circuit breakers also make use of insulating oils in huge amounts.
Oils inside transformers are mainly for insulating purpose - apart from which they also suppress
corona and arcing, and also act as coolants inside the machines. These oils must be maintained
absolutely clean and dry in order to achieve and sustain the optimal insulating performance and
dielectric strength. Here rises the need for transformer oil purification process.
What Is Oil Purification?
Oil purification is a process that reduces, or in fact, eliminates all the physical contaminants from
oils by means of physical processes such as oil filtration, de-humidification, and degasification. A
typical oil purification process is nothing but the combination of mechanical filtration and vacuum
degassing. Transformer oil purification process effectively and efficiently removes all those
particles that are larger than 0.2 micron as well as most of the dissolved water and gases in the
oil.
Transformer oil purification process serves to improve the properties of insulation oil. It eliminates
the acidic nature, over moisture, traces of water, dissolved gases, and particulate matter from the
insulating oil effectively and rapidly. The bottom line of this purification process is to enhance the
performance level of transformers, circuit breakers, mutual inductors, cables, and capacitors. All
these equipment and machinery use an insulation system.

Transformer oils start deteriorating over time and decay as well. Extremely high temperatures,
presence of oxygen and water, catalytic action of the materials present within the transformer,
and this deterioration and decay - all these factors pose a collective impact which is oxidation and
cracking of oils. The by-products released through all such processes are highly acidic and this in
turn, results in even more deterioration of the oils. The quality of oils inside the transformers
indeed directly harms transformers in the long run.
Oil Degassing Process
Oil degassing process involves multiple passes of oil and vacuum - oil that is heated to extremely
high temperatures - to finally purify the oil. This process can be performed on an energized
transformer. Oil is actually pulled from the transformer to the degasification unit - it is heated,
vacuum degassed, and finally filtered in this unit; and then the purified oil is transferred back to
transformer.

Oils that are contaminated with any contaminant are no longer considered good insulating agents.
Hence, transformers that contain such oils inside them for longer have to face retarded
performance as well as short life.
Thus, it's of critical importance to maintain the insulating properties of transformer oils by means
of oil purification process at regular intervals. So in order to increase the life of transformers, oil
purification ( official site ) has to be done periodically.


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