Detailed Introduction To The Application Of Insulation Materials

Insulating materials should first have high insulation resistance and withstand voltage strength, and be able to avoid accidents such as leakage and breakdown. Secondly, the heat resistance should be good to avoid aging and deterioration due to long-term overheating; in addition, it should also have good thermal conductivity, moisture resistance and lightning protection, high mechanical strength, and convenient processing. According to the above requirements, the performance indicators of commonly used insulation materials include insulation strength, tensile strength, specific gravity, expansion coefficient, etc.

Dielectric Strength

The higher the voltage applied to both ends of the insulator, the greater the electric field force on the charges in the material, and the easier it is for ionization collisions to occur, causing breakdown of the insulator. The lowest voltage that causes the breakdown of an insulator is called the breakdown voltage of the insulator. When a 1 mm thick insulating material breaks down, the number of kilovolts of voltage that needs to be applied is called the dielectric withstand voltage strength of the insulating material, or dielectric strength for short. Since insulating materials have a certain dielectric strength, manufacturers of various electrical equipment, various safety tools (electrical pliers, electric test pens, insulating gloves, insulating rods, etc.) and various electrical materials all stipulate certain allowable voltages, which are called is the rated voltage. The voltage it withstands during use must not exceed its rated voltage to avoid accidents.

Tensile Strength

The tensile force that an insulating material can withstand per unit cross-sectional area. 

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