Definition of insulating material

According to the national standard GB2900.5 provides the definition of insulating material is: "used to make the device in the mica insulation tape of the material." That is, to prevent the current through the insulating material. Its resistivity is very high, usually in the range of 10 ~ 10Ω · m. Such as in the motor, the insulating material around the conductor will be isolated and isolated from the grounded stator core to ensure the safe operation of the motor
Resistivity of 109 ~ 1022 Ω • Cm material composition of the material in the electrical technology known as vpi mica tape, also known as dielectric. Simply means that the charged body and other parts of the material isolation. Insulation material on the DC current has a very large resistance, under the action of DC voltage, in addition to a very small surface leakage current, the fact is almost non-conductive, and for the AC current there is a capacitor current through, but also that is not Conductive. The greater the resistivity of the insulating material, the better the insulation performance.
Electrical technology Insulation material is usually referred to as the resistance coefficient greater than 10 9 square Ω.cm material. The role of insulating material is mainly in the electrical equipment to separate the potential of the live part of the isolation.
So the insulation material to have a good dielectric properties, that is, have a high insulation resistance and pressure strength, to be able to avoid leakage, creep and breakdown and other accidents; followed by insulation materials, heat resistance is better, mainly to To ensure that there will be no long-term heat due to performance changes; in addition to good thermal conductivity, moisture and a higher mechanical strength and process processing and so on.
Electrician commonly used insulating materials, according to the different chemical properties, can be divided into inorganic materials, organic. Insulation materials and mixed insulation materials of three types.