Common
Transformer oil
Highly refined mineral oil
Transformer oil
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, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit breakers. It functions to insulate, suppress corona discharge and arcing, and serves as a coolant. Most often, transformer oil is based on mineral oil, but alternative formulations with different engineering or environmental properties are growing in popularity.
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