What insulating material is best `?

What insulating material is best `?

Liquid insulation material, also known as insulating oil. Fill the internal or inter-electrode gap between the solid material to improve its dielectric properties and improve the cooling capacity of the equipment. Liquid insulation material high breakdown strength, dielectric loss tangent (tgσ) small, insulation resistance High specific dielectric constant, in addition, also has excellent physical and chemical properties, such as high gasification temperature, high flash point, low freezing point, thermal conductivity, thermal stability, in the electric field under the suction Small and so on.

Gas insulation material has a high ionization field strength and breakdown field strength, after the breakdown can quickly restore insulation performance, chemical stability, non-combustible, non-explosive, non-aging, non-corrosive, easy to discharge decomposition, and greater heat capacity , The thermal conductivity, and the flowability are all. The air is the most widely used gas insulating material, for example, between the overhead wires of the AC and DC transmission lines, and the overhead wires are insulated by air. The high voltage standard capacitors also use gas insulating media (SF6) .SF6 is also used in the manufacture of high-voltage circuit breakers, metal-enclosed combination of electrical appliances, gas-insulated transmission pipeline cables and gas-insulated transformers, etc., the use of high-pressure nitrogen or carbon dioxide.

The earliest use of insulating materials is cotton, silk, mica, rubber and other natural products .20 century 30 years later, the rapid development of synthetic insulation materials, a variety of synthetic resin, plastic, etc. used in the field of electrical engineering to manufacture motor and high and low pressure Electrical appliances, so that the capacity of electrical products continue to expand, the volume gradually reduced, so as to promote the development of electrical and electronic technology.

Insulation materials, also known as insulation materials. Insulation material refers to the electrical insulation material, the conductivity of about 10-10 West / m below. According to the needs of different electrical products, but also from the storage Can, heat, cooling, arc, moisture, mildew, anti-corrosion, anti-radiation, mechanical support and fixed, protective conductor and so on.

According to their polarity is divided into weak polarity, non-polarity, polarity and strong polarity 4. According to the material source is divided into mineral insulating oil, synthetic insulating oil and vegetable oil 3. Mineral insulating oil referred to as mineral oil, The relative dielectric constant is about 2.2, and the breakdown voltage in the standard electrode is 35 to 50 kV (kV). The flash point is 125 to 135 ° C for the manufacture of transformers and cables , Capacitors, etc. Synthetic insulating oil is a synthetic liquid insulating material.As the mineral oil is a mixture of various hydrocarbons, it is difficult to remove the components of the insulation performance, and the preparation process is complex, easy to burn, low heat resistance , The dielectric constant is not high, so the research and development of the excellent performance of the synthetic insulating oil. Now have used aromatic synthetic oil, silicone oil, ester oil, ether and sulfone synthetic oil, polybutylene, etc. Vegetable oil use Castor oil, soybean oil, rapeseed oil, etc. Castor oil is an excellent dip capacitor for pulse capacitors