What is Transformer Oil Purifier?

A transformer oil purifier removes moisture, dissolved gases, sludge, and solid particles from insulating oil by means of vacuum dehydration, degassing and precision filtration. The purifier regenerates the oil dielectric properties, enhances transformer reliability, increases breakdown voltage (BDV), prolongs transformer oil service life, and reduces the likelihood of electrical failures.

When should transformer oil be purified instead of being replaced?

Transformer oil should be purified when the main cause of contamination is water, dissolved gases or particulate matter, if the basic properties of the oil are still within acceptable limits. Transformer oil filtration is an economical method of restoring oil quality without having to replace the entire volume of oil. However, if the oil is badly oxidised, has a high acid value, or too much sludge formation, a transformer oil regeneration machine could be recommended instead of standard filtration.

The transformer oil purifier can improve the BDV (breakdown voltage) to what extent?

The improvement is dependent on the initial condition of the oil. Most of the high efficiency vacuum transformer oil purifiers can increase the breakdown voltage of the oil from 20-40 kV to more than 70 kV with the moisture content reduced to below 5 ppm. Actual performance can vary based on transformer age, oil condition, and operating environment.

an a transformer oil purifier remove dissolved gases and moisture at the same time?

Yes. Modern vacuum transformer oil purifiers are designed to remove both dissolved gases and moisture simultaneously. The high-vacuum chamber separates water vapor and dissolved gases from the oil, while multi-stage filters eliminate solid contaminants. This comprehensive purification process helps restore the insulating performance of transformer oil and prolongs transformer service life.

How to Choose the Right Transformer Oil Purifier Capacity?

The required capacity is based on the size of the transformer, the amount of oil, and the maintenance schedule. Routine field maintenance uses portable units from 1,800 to 3,000 LPH, whereas large substations and utilities require 6,000 to 18,000 LPH systems for high-volume oil treatment. The right transformer oil purifier will guarantee that filtration is effective, maintenance time is minimised, and operating costs are reduced.

Transformer Oil Purifier

A transformer oil purifier is an important maintenance device used to remove moisture, dissolved gases, solid particles, sludge, and other impurities from the insulating oil of power transformers. Over time, transformer oil degrades due to the effects of oxidation, ingress of moisture, and contamination, leading to reduced dielectric strength, poor cooling performance, and accelerated insulation ageing. Regular filtration of transformer oil restores the oil’s electrical and physical properties, improves transformer reliability, and reduces maintenance costs and unexpected outages.

Chongqing YUNENG Oil-Filter Manufacturing Co., Ltd. specialises in the design and manufacture of advanced vacuum transformer oil purifiers for utilities, transformer manufacturers, substations, power plants, renewable energy projects, and industrial facilities around the world. Our purification systems employ high vacuum dehydration, efficient degassing technology, and multi-stage precision filtration to effectively remove free water, dissolved moisture, gases, and microscopic particles from transformer oil.

The purified oil achieves much improved breakdown voltage (BDV), lower moisture content, reduced dissolved gas levels, and improved insulation performance, helping to extend transformer oil service life and the operating life of valuable electrical equipment. Oil purification is a cost-effective alternative to replacing the oil completely and reducing the environmental impact in many maintenance applications.

YUNENG has over 20 years of experience in manufacturing, with a professional team of 168 employees and an annual production capacity of more than 1,000 transformer oil filtration systems. YUNENG has become a trusted supplier to customers in over 100 countries and regions. Our product line includes transformer oil purifiers, transformer oil regeneration machines, portable oil filtration units, vacuum oil purifiers, dry air generators, and transformer oil testing equipment, providing comprehensive solutions for transformer oil maintenance across the entire equipment lifecycle.