The main index of affecting insulation material property
1. Insulation resistance and resistivity
The resistance is the reciprocal of conductance, and the resistivity is the resistance per unit volume. The smaller the conductivity of the material, the greater the resistance, for the insulation material, always want the resistivity as high as possible.
2. Relative dielectric constant and dielectric loss tangent
Insulation material has two applications for electrical network components of the mutual insulation and capacitor medium (energy storage). The former requires a relatively small relative dielectric constant, which requires a relatively large relative dielectric constant, and both require dielectric loss tangent, especially in insulating materials of high frequency and high pressure applications, in order to make dielectric loss small , require the insulation material of dielectric loss tangent small .
3. Breakdown voltage and Electrical strength
In a strong electric field, insulating materials occur destroying , then loss of insulation property into a conductive state, known as the breakdown. Electrical strength is breakdown under the rated conditions, the voltage and withstand the voltage between the two electrodes distance , that is, the unit thickness bear breakdown voltage. For insulating materials, the value of breakdown voltage and electrical strength, the higher the better.
4. Tensile strength
Is the maximum tensile stress that the specimen is subjected to in the tensile test. It is the most widely used and most representative test of the mechanical properties of insulating materials.
5. Flame resistance
Refer to e ability of the insulating material to resist the continued combustion when it is combusted or in contact with the flame. With the increasing use of insulating materials, its resistance property is more important, people through various methods to improve flame resistance of insulating materials. The higher the flame resistance, the better the safety.
6. Arc resistance
Under the specified test conditions, the insulating material is resistant to the ability to act along the arc of its surface. When using high-voltage alternating test current, generated by high voltage arcing between the two electrodes, the material of the conductive surface of the insulating layer is formed the time required to determine the arc-proof insulating material. The greater the time value, the better the arc resistance.
7. Seal property
The seal and isolatiob to oil and water is better.