Transformer oil filtration is carried out with Ultra High Vacuum oil filter machine of adequate capacity. Our mobile oil filtration plant is designed to remove dissolved moisture, dirt, air and other gases from the transformer oil.

This two stage Mobile filtration plant operates on the principle of Low Temperature and High Vacuum. Unfiltered oil is taken in to the system through the inlet valve. Then the oil is pumped to the system through positive displacement pump. Preliminary Coarse filters protect the pump by entering solid and magnetic particles up to 1 mm size. The oil is heated up to 60-65°C. After heating the oil passes through the cartridge filters where the particles up to 2 microns are filtered. Then the oil is passed through a specially designed vacuum chamber, where the moisture, air and other gases are extracted from the oil. The vacuum chamber is designed in such a way that the oil is spread out and is allowed to fall by gravity over the media inside, forming a thin film of oil providing a large surface area exposed to vacuum. With this exposure, the dissolved moisture and gases are evacuated to improve the insulating properties of transformer oil.

We carried out BDV and PPM test at site with BDV and PPM Instrument. Instruments are calibrated by NABL.

Test Result before and after Transformer Oil Filtration.

Before Filtration

BDV – 20 to 30KV and PPM – More than 30.

After Filtration

BDV > 70KV and PPM < 3.