Transformer oil regeneration – what is it? ……why should we make regeneration?

By the regeneration process of old oil are achieved all important oil parameters in accordance to the valid standards for a new oil. Regeneration is not filtration, however filtration is part of regeneration process too.  After the regeneration transformer contains oil with the same parameters like new oil, transformer is dried (including of solid isolations) and degasified. Tests of the thermal-oxidation stability of new oil and regenerated oil proved that regenerated oils have better stability than new oils.  

Regeneration process, advantages:

Oil changing/oil renewal:

One regeneration process is something like multi oil changing“, it means oil is changed more times during one process until time when parameters of oil from the transformer to regeneration unit have required values. Regeneration process clean oil from sludge, cleans oil from corrosive products of sulphur and DBDS If any contained, Regeneration process makes de – gasification (CO, CO2, O2, N2 etc.), drying and decreasing of oil acidity. Regeneration process clean transformer from sludge inside. Regeneration can be done during transformer operation

New oil is delivered in crude form and filtration before changing is necessary. Old launched oil is specified as dangerous waste and all law conditions has been kept as well for his liquidation. Up to 10 % of old oil stay in transformer, it means oil rest will contaminate new oil immediately by sludge. New oil can contain chemicals parts which can start quick corrosion process.  Usually drying and de – gasification by using of filtration technology is necessary

Used oil samples from tap changers, see on left side. Result after regeneration, see on the right side.

Picture of sludge.

Transformer lifetime is limited by state of transformer`s cellulose insulation. We are able to decrease aging velocity of solid insulation by using of regeneration, but changes, that have already occurred are irreversible.

We are proposing to you services as flowing:

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•Oil regeneration (we guarantee all the parametrs after regeneration).
•All the laboratory test of transformer`s oil Providing of transformer diagnostic including of report and       recommendation of necessary steps to have save machine.
•​Repairs and maintenance of transformer stations If necessary Other services for transformers.

To be able to prepare proposal for oil regeneration we need to know:

•​Water content in the oil (or oil sample to be able to do it in our laboratory).
•​Transformer temperature when samples have been taken.
•​ Acidity number (or oil sample to be able to do it in our laboratory) Transformer description (voltage level).
•​Total oil weight (in the transformer).
•​Place.
•​ Etc.