Basic properties of insulating materials
In order to prevent the insulation property damage of the insulation material from causing accidents, the insulation material must meet the performance index stipulated by the national standard. However, there are many performance indexes of insulation materials, and the characteristics of various insulation materials are also different. The main performance indexes of common insulation materials include breakdown strength, heat resistance, insulation resistance and mechanical strength.
(1) breakdown strength. Insulation material will be damaged and lose insulation performance under the action of electric field intensity higher than a certain value. This phenomenon is called breakdown. The electric field intensity when the insulation material is broken down is called the breakdown intensity, and the unit is kV/mm.
(2) heat resistance. When the temperature increases, the resistance, breakdown strength, mechanical strength and other properties of the insulation material will decrease. Therefore, the insulation material is required to work for a long time under the specified temperature and the insulation performance is guaranteed to be reliable. Insulation materials with different components have different degrees of heat resistance, and the heat resistance grade can be divided into Y, A, E, B, F, H, C and other 7 grades, and the highest limit working temperature is specified for each grade of insulation materials.
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