Transformer oil is used in electrical power transformers due to its properties, such as high insulation, stability at higher temperatures, dielectric strength, etc.
It mainly works as a cooling agent and an insulator. In this article, we discuss transformer oil and its types.
Transformer oil is a special type of oil with excellent insulating properties. Therefore, it is also known as insulating oil. Electrical power transformers use this oil to insulate, prevent arcing and dissipate the transformer’s heat.
Transformer oil is highly stable even at high temperatures.
Mainly two types of transformer oil are used in transformers, namely:
Naphthenic oil is easily oxidizable as compared to paraffinic oil. The product of oxidation – the sludge in the naphthenic oil is more soluble than the sludge from the paraffinic oil. That is how the naphtha-oil-based sludge does not precipitate at the bottom of the transformer, not disturbing the transformer’s cooling system.
The oxidation product is insoluble and precipitates at the bottom of the tank, though paraffinic oil has a lower oxidation rate than naphthenic oil. The sludge acts as an obstruction to the transformer’s cooling system.
Here are some of the parameters to check the serviceability of the transformer oil:
Dielectric strength, specific resistance, and dielectric dissipation factor.
Water content, sludge content and acidity.
Viscosity, interfacial tension, flash point and pour point.
Transformer oil testing is necessary because:
Continued exposure to transformer oil can cause skin dryness or crack. If it comes in contact with the eye, it may cause temporary eye irritation. Prolonged contact with used oil may cause severe skin diseases like skin cancer and dermatitis.
Therefore, take precautions while using the oil, remove contaminated clothing, and wash your skin with soap and water. Get medical assistance if any discomfort continues.
In conclusion, the oil used in the transformer is a key element in checking the physical condition of the unit. The mineral-based oil is used in various transformers because of its dielectric strength and electrical properties.
If you are looking for transformer oil testing in Vadodara, we can help you with the service. For more information, visit us at Laxmi Associates.