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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.
Some examples are in transformers, where it is known as transformer oil, and in high-voltage switchgear, where mineral oil is used as an insulator and coolant to disperse switching arcs. [21] Because it is noncompressible, mineral oil is used as a hydraulic fluid in hydraulic machinery and vehicles.
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 ...
Large power transformers are filled with oil that cools and insulates the transformer windings. Mineral oil is the most common type in outdoor transformers; fire-resistant fluids also used include polychlorinated biphenyls (PCB)s and silicone. [4] The insulating liquid is in contact with the internal components.
In Kenya, a number of cases have been reported in the 2010s of thieves selling transformer oil, stolen from electric transformers, to the operators of roadside food stalls for use in deep frying. When used for frying, it is reported that transformer oil lasts much longer than regular cooking oil. The downside of this misuse of the transformer ...
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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.
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