What is the main purpose of insulating materials?
As the insulating material has a certain degree of insulation strength, a variety of electrical equipment, all kinds of safety equipment (electrical pliers, test pen, insulated gloves, insulation rods, etc.), a variety of electrical materials, factories are required to allow a certain voltage, For the rated voltage. The voltage to be used shall not exceed its rated voltage value in order to avoid accidents.
Second, the heat resistance is better, to avoid long-term overheating and aging deterioration; In addition, there should be good thermal conductivity, resistance to lightning resistance and high mechanical strength and process processing and other characteristics. According to the above requirements, commonly used insulating material performance Indicators of insulation strength, tensile strength, specific gravity, expansion coefficient.
The role of insulating material is in the electrical equipment to separate the potential of the live part of the insulation, so the insulation material should first have a high insulation resistance and pressure strength, and to avoid leakage, breakdown and other accidents.
Tensile strength: The cross-sectional area of the insulating material can withstand tensile forces, such as glass per square centimeter cross-sectional area can withstand the resistance of 1400 Newton.
Insulation withstand voltage: the higher the voltage applied across the insulator, the greater the electric field force received by the material, the more prone to ionization collision, resulting in insulator breakdown. The lowest voltage breakdown of the insulator is called the breakdown of this insulator Voltage. 1 mm thick insulation material breakdown, the need to add the voltage kV is called insulation material insulation voltage strength, referred to as the dielectric strength
