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Liquid insulating material, also known as insulating oil, is used to isolate liquids with different potential conductors. The main function is to replace gas and fill the gap between solid and internal poles, so as to improve their dielectric properties and improve the heat dissipation capacity of the device.

Its breakdown strength is high, dielectric loss tangent (tan delta) is small, insulation resistivity is high, and relative dielectric constant B is small (capacitor in order to increase energy storage requires B). It also has excellent physical and chemical properties, such as high gasification temperature, high flash point, low freezing point, high thermal conductivity, good thermal stability, and low air absorption under electric field.

Classification: according to its polarity, it can be divided into weak polarity, non polarity, polarity, strong polarity and so on. According to the material source, it can be divided into 3 types: mineral insulating oil, synthetic insulating oil and plant oil.

The first liquid insulating material is plant oil, such as castor oil, soybean oil, rapeseed oil and so on. A variety of synthetic insulating oils have been developed, such as silicone oil for high temperature and twelve alkyl benzene and polybutene oil. Mineral insulating oil is the most used in engineering.

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