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The regular purification of electrical insulating fluids is necessary to ensure longevity of your transformer. Moisture, solids and Gaseous contamination can seriously affect the function of electrical insulating fluids as a coolant and insulator. Transoil Services offers a process of oil treatment focusing on using the latest technology to suit your needs.

Spreading of oil

The spreading of oil is vital for easy release of moisture and gaseous containments. It is accomplished by a porous media cartridge called a coalescer. In this process heated or unheated oil
passes through the layer of bonded fiberglass, where millions of sharp edges shear oil and expose
it to the effect of the vacuum. Spreading of oil by passing through a coalescer is so effective that oil
can be treated at temperatures as low as 20ºC. Our method ensures that oil dryness to 3ppm and lower can be achieved without exposing the oil to high temperatures. The release of combustible gas from the oil is also highly efficient ensuring that the oil is fully degassed in the electrical apparatus.


Instrumentation and electrical controls are located in a dust proof enclosure. A mimic panel is provided for the convenience operator showing the functions of the main components of the plant by way of pilot lights. Although the purifier features fully automatic operation, a manual override of various functions is provided as standard. Even with manual override vital plant protection such as oil overflow is still in force. Options are available from Transoil Services to incorporate programmable Logic Controls (PLC), which reduce the monitoring work load of the operator.


The filtration plant uses disposable pleated paper cartridges constructed of non-migration type cellulose materials featuring a large surface area and dirt holding capacity. The advantage of cartridge type filters is the low cost of filtration, easy and fast change of filter cartridges and no loss of oil or time for back washing. Solid particles in the oil inhibit the insulating oil of achieving high dielectric values, which are critical in high voltage power transformers. Regular changes of oil filters will ensure the required cleanliness which in turn will reduce the number of oil passes through the plant and subsequent time spent on site.


Aging Transformer Oil Forms Sludge

As transformer oil ages, it oxidizes and begins to break down. The by-products of the degradation
process include acids, , aldehydes, and peroxides, which bind together to form sludge. Sludge attacks
the cellulose insulation, inhibits oil flow, and traps heat inside the transformer. Eventually the dielectric gap is bridged, resulting in failure of the transformer.

Oil reclamation extends unit life

Transoil Services mobile regeneration system restores transformer oil by removing acidity, sludge and soluble oil decay products with Fullers Earth treatment technology. When the treatment is complete, the regenerated oil meets or exceeds international standards for new oil with lower acidity and improved tan delta, interfacial tension, and oxidation stability. The cellulose insulation and internal components of the transformer also benefit from the flushing affect of multiple passes of hot reclaimed oil, which helps remove decay products and sludge from surfaces.

Regular regeneration treatments every eight to twelve years for each transformer in your network offers significant benefits.

  • Reduced risk of unplanned outage and costly downtime
  • Reduced maintenance costs.
  • Extended equipment life

Transoil Services Reactivation Technology

The best process for regenerating transformer oil is treatment using Fullers Earth. However, conventional regeneration units are costly to operate, requiring large amounts of Fullers Earth which must be disposed of and replaced after each use. The Transoil Services Oil Regeneration System features high-performance reactivation technology with Fullers Earth installed in the plant for two to three years.
The Fullers earth can be cleansed or reactivated 200 to 300 times before replacement is required. Oil can be processed continuously using the same charge of Fullers Earth. No disposal of oil soaked waste is required, greatly reducing the cost of operation.

Additional System Features

  • Support on energized and non energized transformers
  • Flow rates vary from 600 to 10 000 liters per hour
  • Oil processing capacity from 1000 to 15 000 liters per cycle
  • Fully Automated controls