Transformer oil
Highly refined mineral oil / From Wikipedia, the free encyclopedia
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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. Its functions are to insulate, suppress corona discharge and arcing, and to serve as a coolant.
Transformer oil is most often based on mineral oil, but alternative formulations with different engineering or environmental properties are growing in popularity.