Transformer Oil


Transformer Oil: Testing, Price & Manufacturers



Transformer oil (insulating oil) is a different type of oil that comes with outstanding electrical insulating properties. Also, this oil is reliable at high temperatures.

This insulating oil is helpful for high-voltage electrical infrastructures like capacitors, transformers, switches, and circuit breakers.

It also comes for operating at very high temperatures, insulating, cooling, arching, and stooping corona combustions. Moreover, transformer oils enclose the transformer’s windings and core to prevent cellulose-based insulation and wiring from corrodings, oxidizing.

With thermal conductivity, chemical stability transformers oil can circulate between radiators and center. Furthermore, it has outstanding dielectric stability that can reduce infrastructure temperature.


Transformer Oil Functions:

The transformer oil functions purpose is insulation and cooling. It’s important to know that several available varieties of elements can improve dissimilar dielectric stability.

So, these kinds of materials may protect voltage equal to dielectric power. Nevertheless, the two functions of transformer oil are insulator and coolant.



An insulator works like a non-conductor. It contains massive dielectric power to tolerate with a high voltage. So, this is the only reason to use this as an insulator within the transformer.



Cooling is the primary function of Transformer oil that works as a coolant within the transformer. It can fulfill the transformer coil design with copper because of carrying a high current.

That’s why the coils of the transformer become hot. Hence, this coolant is a beautiful warmth conductor. By using these coolant copper coils, the temperature can reduce. On the other hand, the transformer oil plays a crucial role in preventing the wave from burning.


Transformer Oil Properties:

Transformer oil has a chemical, electrical and physical properties that transformer oil should maintain for maximally valuable purposes. The transformer oil properties contain are:


Electrical Properties:

Dielectric strength to perform as an effective insulator it’s the main difficulty in this area. An oil of a transformer has a specific level of friction that is voltage and divided by current.

Finally, this oil dielectric waste factor defines how much “leaks” out of the system.


Chemical Properties:

The water content of this oil is not preferable as it impedes oil’s dielectric properties. Also, it’s vital to minimize the sludge and acidity content.


Physical Properties:

The difficulty of high interfacial is preferable between the boundary of water and oil. As a low powerpoint and high flash point, this high interfacial tension is essential.


Categories Of Transformer Oil:


Nowadays, the fundamental two categories of transformer oil are in use. The two transformer oil categories are:



  1. Paraffin Transformer Oil:

This type of transformer oil is not oxidized effortlessly as naphtha-based oil, creating tiny mud. However, naphtha-based oil can quickly eliminate the dirt from this type of oil.

It’s because paraffin oil is more soluble. At the ground of the transformer container, when mid takes place, it interferes with the operation.


  1. Naphtha Transformer Oil



Naphtha oil does not include dissolved wax, as it has paraffin-based oil. This dissolved wax enhances the pour point and causes issues.

But in summer, where the temperature is very high, this isn’t an issue. Paraffin oil is finally most typically utilized in transformers worldwide.


Transformer Oil Testing:


To ensure this oil works for existing standards, you need to test it. Many international standards defined these testing procedures and standards. Hence, the maximum is set by the ASTM (the American Society For Testing and Material).

Transformer oil testing forms scaling the voltage of breakdown and other physical and chemical properties of the oil. Either it is tested with a compact test kit or in a laboratory. With proper testing, the lifespan of transfers can increase, even reduce the need for replacement.


Factors Of Testing:


Here below have some ordinary things to look for while performing an oil test:


  • A typical specification for mineral transformer oil used in electrical equipment (ASTM D3487).
  • Acid number (ASTM D664).
  • Fluid power element (ASTM D924-08)
  • Particular friction (ASTM D1169)
  • Dielectric corrosion voltage (ASTM D877)
  • Interfacial pressure (ASTM D971)
  • Illustrated inspection (ASTM D1524)
  • Sulfur of corrosive (ASTM D1275)


These tests can help to determine when the oil is clean and can produce a baseline of properties.

Still, you can get an available, wide range of tests in the market, but all are not reasonable. So in your first testing to use them as diagnostics because it is best.

Likewise, the frequency of choice depends on voltage and capacity. If you can see the test results are red flags, increasing the frequency is important.

Understanding the difference of gassing rates between regular and excessive is essential. By using the dissolved gas analysis test, you can appreciate the dissolved gas amount.


The Importance Of Testing Transformer Oil:


There are many reasons to test the transformer oil. So, the testing is essential to:


  • Determine necessary transformer oil electrical properties.
  • It can identify if the primary oil is sufficient for future use.
  • Discover whether filtration or regeneration requires.
  • Decrees costs of oil and increases component life.
  • Moreover, it can prevent untimely downfalls and maximize security.



Transformer Oil Viscosity:

Transformer oil viscosity can resist flow in typical weather. Transformer oil resistance flow means circulation of oil obstacles of conference inside the transformer.

A good oil contains low viscosity and delivers less friction to the standard oil flow without affecting the cooling.

But as little as possible, you can increase the oil viscosity with an equal decrease in temperature. Every type of fluid becomes extra viscous to decrease the temperature.

Proper oil comes with low viscosity, and it offers less friction to the traditional flow of oil, thereby not affecting the cooling of a transformer.

Transformer oil low viscosity is essential, but it is equally crucial that oil viscosity should increase as little as possible with a decrease in temperature.


Transformer Oil Grades:


So, the transformer oil grades are in line with international criteria like IEC 60296. Usually, there are defining grades, usage, range of classes, lowest cold start, stimulating temperatures, additives, and more.


Transformer Oil Price:


One of the most commonly used transformer oil and insulating liquid is essential for transformers. Like another liquid, transformer oil also comes with a reasonable price.

In the domestic and industrial market transformer, oil prices are so r
easonable. Even, Total Lubricants Bangladesh supplies the transformer oil at an affordable price.

So if you want you can purchase this oil or any oil from them. Nevertheless, in Bangladesh, the transformer oil price is 150-200 BDT and Globally 2-3$ per liter.


Transformer Oil Manufacturers:

Worldwide there are many transformer oil manufacturers available. You want to start an electrical equipment maintenance company and need more resources.

Total is a famous company which is supplying the type of lubricants. This is the only manufacturing company that provides any oils for your requirements.


Total Transformer Oils:

Usually, Total transformer oil is suitable for oil-filled electrical transformers. To protect their components from deterioration and high-stress conditions, and overheating.

Likewise, this oil can prevent short-circuiting, wear-reducing, replacement costs, optimizing electrical equipment performance, and assuring grid energy.


Reason For Selecting Total Transformer Oils:


Power systems and energy grids rely upon frequent performance, whether they provide electricity or business life. The transformer is the central part of this infrastructure of power.

But to function correctly, it needs to insulate with lubricants. Make sure not to overheat it with extreme voltage, either it will burst.

Total Lubricants Bangladesh have a best solution of transformer oil which will gives this protection. Furthermore, it provides transformer components cooling like insulating, core, and winding them. This oil also protects the transformer material against wear and corrosion, and overheating.


Final Thought:


Ultimately, we are trying to clear and detail information on transformer oil. So, having adequate care and maintenance will protect this oil for many years.

Therefore, it can indirectly increase the performance, efficiency, reliability of the equipment. Hence, we hope this can be beneficial for you if you want to start a lubricant business.







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