Advantages of Dimethicone as an Electrical Insulating Medium

Dimethicone is widely used in the electromechanical industry as an electrical insulating medium. Although the electrical properties of dimethyl silicone oil are not stronger than that of general insulating oil, it has a wide range of viscosity, good thermal stability, oxidation resistance, low dielectric loss, low freezing point and vapor pressure, high flash point and ignition point, and can be used in a wide range of temperature and frequency. Good dielectric properties are maintained within the range. And it has good compatibility with other insulating materials, so it is widely used as insulation, cooling, immersion, lubrication, damping, coating and heat carrier of various transformers, capacitors, electronic equipment, components and devices, cable connection parts, etc.

Among the commonly used transformer oils, mineral oil is the most used. Its advantages are good dielectric properties and low cost. Its fatal weakness is that it is easy to burn and is very unsafe. For example, although PCBs have excellent fire resistance, they have strong carcinogenicity and have been banned in major countries; although fluorine-chlorinated compounds have good fire resistance, their boiling points are too low, and poor sealing will cause environmental pollution.

In contrast, dimethicone has many advantages. Therefore, the transformer with dimethyl silicone oil as the cooling insulating medium has developed rapidly with the development of society. Since silicone oil was first used in transformers in 1972, no fault has come from silicone oil. On the contrary, the damage rate of non-silicon oil transformers during this period was as high as 0.2%~0.4%. At present, the United States, Japan, Western Europe and even some countries in the Middle East have used silicone oil transformers in high-rise buildings, residential areas, schools, factories and key departments with special requirements. In the 1980s, China also developed silicone oil for transformers, and the transformers made from it have been operating safely in Beijing subway and other departments for many years.

Although, the price of silicone oil is higher than that of mineral oil. However, with the compact design of transformers, the amount of silicone oil can be greatly reduced, thereby greatly reducing the production of silicone oil transformers. Now it is becoming more and more common to use dimethyl silicone oil instead of mineral oil as electrical insulating oil.

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