In the business there are several processes for decontamination of oil-filled transformers with PCB by means of continuous circulation in transformer using different products as:
To decontaminate the oil with temperature and vacuum, will destroy the dielectric properties of the same and the recirculation through the inside of the transformer, part of reagents attack the varnish of windings and the insulation paper.
On the other hand, the oil of the tank can be decontaminated but not the oil that is on the inside of the transformer winding.
With the transformer on service, the balance by capillarity between the contaminated oil inside of the coil and the decontaminated oil of the tank is reached in a period of six months. This can mean an increase of the PCB content in the decontaminated oil.
Depending on the Company, the guarantee of those processes could vary between three to five months.
This technique should be held with the transformer out of service by and PCB authorized manager, RYMOIL is PCB AUTHORIZED MANAGER from 1991.