The state-of-the-art DES filter was specially designed for the company as it was designed in accordance with its requirements and in collaboration with our engineers to meet their requirements. The unit can filter up to 6000 L / h and is fully automated. It has a network of modern sensors and is fully controlled by PLC. It can be used as a standalone vacuum pump and as a standalone oil pump.

The transformer is one of the key elements of the industry that must be maintained at guaranteed uninterrupted power in order to ensure operation and profitability. The life of the transformer depends mainly on the quality of the insulating oil. The oil serves as a dielectric material and as an effective coolant in the transformer, to perform these functions effectively the transformer oil must be cleaned regularly. The insulating fluid must have certain necessary properties at the time of initial impregnation and filling at the plant, but must be maintained at the same level of quality during operation to ensure optimum performance.

Almost 75% of transformer failures occur due to contaminated and degraded oil. Regular oil recovery is of the utmost importance as it is a great financial burden in case of replacement or repair of the transformer. Neglecting the transformer oil purification can result in:

• Arcing
• Overheating, which reduces electrical efficiency as well as the life of the transformer
• Corona Discharges
• Decrease in insulating strength of the transformer oil, and more

The fundamental quality parameters of transformer insulating oil are:

• Color; e.g., ASTM D1500
• Dielectric breakdown voltage; e.g., D 877, ASTM D1816
• Dissolved gas analysis; e.g., ASTM D3612
• Dissolved metals; e.g., ASTM D7151
• Flash point, fire point; e.g., ASTM D92
• Interfacial tension; e.g. D 971
• Furanic compounds; e.g., ASTM D5837
• Karl Fischer moisture; e.g., ASTM D1533

• Liquid power factor; e.g., ASTM D924
• Neutralization number; e.g., ASTM D974
• Oxidation inhibitor content; e.g., ASTM D2668
• Polychlorinated biphenyls content; e.g., ASTM D4059
• Relative density (specific gravity); e.g., D 1298, ASTM D1524
• Resistivity; e.g., ASTM D1169
• Visual examination; e.g., ASTM D1524

Advantages for transformer oil purification:

• Improved insulation properties of the oil and hence the other media like paper/cellulose insulation
• Better the insulation of transformer, longer the life of the transformer and lesser the breakdown of the transformer
• Longer the life of the transformer asset, good returns on investment of the asset
• Lesser breakdowns and failure of the transformer results in uninterrupted power supply

After purification the oil will return to the following levels:

Water content:              ≤ (less than or equal to) 10 ppm
Gaseous content:          ≤ (less than or equal to) 1%
Particulate Contents:   ≤ (smaller than or equal to) 3m
Dielectric strength:      ≥ (greater than or equal to) 65 KV

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