Oil regeneration system and preventive maintenance
The increasing demand for electricity has taken a toll on
transformers which are burdened with stress and overheating and result in
breakdowns. The significance of maintaining the transformer
insulating oil in good condition and mitigating oil
deterioration has been widely acknowledged in the industry.
Ageing of transformers have received increased focus in the
recent past, owing to their relation with oil deterioration and oil
regeneration system of transformer
insulating oil.
When oil and paper, the two main players of insulation, age,
they produce acids and moisture. Such by products must be identified and removed
so that ageing is controlled and longevity is enhanced.
Besides, measuring these byproducts reveal intensity of the
ageing process. Acidity and humidity of the paper enlightens about the ageing
that the cellulose insulation went through.
The physical, chemical and functional attributes of
transformer insulating oil receives a beating when the oil is subjected to
high temperatures, oxidation and contact with moisture. Such oil
deterioration is however treated with oil
regeneration system which not only protects the oil, but also restores the
original quality and makes it as good as new.
Oil purification and oil regeneration restores quality in transformer
insulating oil. While the former is done in earlier stages of oil
deterioration, the latter is complex and not only removes impurities but
also solves impurities like sludge and acids. Thus lifespan of the transformer
insulating oil is extended.
When put through high voltages, water drops occur in the oil
and such moisture content affects the dielectric strength of the transformer
insulating oil and goes through arcing which increases carbon formation. In
such oil
deterioration, the insulating fluid becomes corrosive and damages the metal
parts of the equipment.
Moisture is an important cause of oil
deterioration. The moisture is either small droplets (emulsion) or settled
as water in the bottom (demulsified water). The water settled in the bottom is
removed by employing centrifugal treatment which also requires vacuum
dehydration.
When the dissolved water gets accumulated in the paper insulation,
the insulating properties are severely affected. Removing water content from
the paper is a tedious process which involves drying out with heat and vacuum.
The moisture also speeds up the degradation of the cellulose
material and accentuates oxidation. The chemical reactions result in
polarization of oil molecules and end up as sludge formation.
Oxidation must be averted as much possible because oxygen
reacts with inner parts of the transformer. The gaskets and seals of the
apparatus need regular maintenance.
Single use Fullers Earth regeneration and multiple use
reactivation regeneration are two methods employed to combat oil
deterioration.
The transformer
insulating oil is strained, heated and filtered before it goes through
series of columns which comprise the regeneration system. Oil purification
involves dehydration and degasification and the quality of the transformer
insulating oil thus reaches an eligible and as good as new status.
On a concluding note, regeneration system of transformer
insulating oil and minimizing oil
deterioration cannot be afforded to be taken in a lighter note. Besides
maintenance of transformer
insulating oil avoids repairs and adds to the profit accounts.
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