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Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. It is used in oil-filled wet transformers, [ 1 ] some types of high-voltage capacitors , fluorescent lamp ballasts , and some types of high-voltage switches and circuit breakers.
Mineral oil: 1.0 [1] Flammable. Common type of transformer oil. n-Hexane: 1.1–1.3 [1] Flammable. Used in some capacitors. n-Heptane: Flammable. Castor oil natural ester 4.7: High dielectric constant. Flammable. Refined and dried castor oil is used in some high voltage capacitors. Hatcol 5005 synthetic ester [2] 3.2: High dielectric constant ...
Use of PCBs is commonly divided into closed and open applications. [2] Examples of closed applications include coolants and insulating fluids (transformer oil) for transformers and capacitors, such as those used in old fluorescent light ballasts, [29] and hydraulic fluids considered a semi-closed application.
Amateur use of mineral oil follows industrial use, since it typically is the insulating and cooling fluid in large electrical transformers and similar equipment, such as small switches used for high-voltages. Mineral oil is used as a brake fluid in some cars, such as Citroën models with hydrodynamic suspension, and bicycle disc brakes.
Oil-cooled three-phase distribution transformer, similar to one in above photo, with housing off, showing construction. Distribution transformers consist of a magnetic core made from laminations of sheet silicon steel ( transformer steel ) stacked and either glued together with resin or banded together with steel straps, with the primary and ...
As transformer oil deteriorates through aging and moisture ingress, transformer oil should, depending on economics, transformer duty and other factors, be tested periodically. [5] Electric utility companies have a vested interest in periodic oil testing because transformers represent a large proportion of their total assets.
Transformer oil is flammable, so oil-filled transformers inside a building are installed in vaults to prevent spread of fire and smoke from a burning transformer. Some transformers were built to use fire-resistant PCBs , but because these compounds persist in the environment and have adverse effects on organisms, their use has been discontinued ...
Transformer oil is used for cooling and additional electric insulation of high-power electric transformers. Mineral oils are usually used. Silicone oils are employed for special applications. Polychlorinated biphenyls were commonly used in old equipment, which now can possess risk of contamination. Fuels are frequently used as coolants for engines.