The performance of the transformer depends mainly on the transformer insulating oil and so the deterioration of the oil leads to severe faults in the transformer. The preventive maintenance requires a periodic purification of the transformer oil. Due to continued operation of the transformer the insulating oil present in the transformer will get contaminated with moisture content, acid compounds and other unwanted chemical gases that are dissolved in the oil. Over the years the amount of impurities that gets deposited in the transformer oil reaches a high value that leads to failure of the equipment. In order to avoid any unexpected failures there arise the need for transformer oil filtration system to remove the impurities from the contaminated oil.

Now a days transformer oil filtration system can be done onsite with out moving the equipment to the near by repairing site which reduces the cost of maintenance by a considerable amount. The process of oil filtration is also done online which means the oil is filtered while in operation. The coarse sludge materials present in the oil are eliminated by suitable oil filtration system machines.

Oil filtration systems are intended for filtration of industrial oils from mechanical impurities. Most often, liquid (transformer oils) and solid (paper, cellulose products, etc.) insulation systems are used. To maximally extend their life, it is necessary to clean the transformer oil. Transformer oil performs important functions. First of all, it serves as an insulating medium and, secondly, it removes heat from electrical equipment. Various factors like air, high temperature, sun light, varnish insulation, paints, moisture and metals cause oxidation processes in oil. If the insulating medium is stabilized from the oxidizing effect, the oils will be able to work at a high temperature, and the insulation system.