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Main terms of cable accessories

2022-08-15
1. Hardness: it is a physical measure of the degree of deformation or piercing resistance of a material under pressure. The Shore hardness refers to the reading of the value measured by the Shore hardness tester, and its unit is "degree". The description method can be divided into A and D, which respectively represent different hardness ranges. The Shore A hardness tester is used to test the values below 90 degrees, and the Shore D hardness tester is used to test the values above 90 degrees.

2. Fracture Strength: refers to the maximum stress at which a material breaks.

3. Elongation at break: the ratio between the displacement value and the original length of the specimen when it is broken. Expressed as a percentage (%).

4. Oxygen Index: refers to the minimum oxygen concentration required for flame combustion of materials in oxygen and chlorine mixed air flow under specified conditions; Expressed as the percentage of volume occupied by oxygen; The higher the oxygen index, the better the flame retardant performance.

5. Dielectric Strength: it is a measure of the electrical strength of a material as an insulator. It is defined as the sample is broken down, the maximum voltage per unit thickness, expressed as volts per unit thickness; The greater the dielectric strength of a substance, the better its quality as an insulator.

6. Dielectric Constant is also called Dielectric Coefficient or Capacitance, it is a coefficient of insulation ability characteristics, expressed by the letter ε, the unit is the law/meter (F/m).

7. Electric Trace: that is, the arc of enough energy, formed on the surface of the insulation (or protective layer) material fine, wire like carbon trace, and cause the increase of leakage current and then form a destructive channel.

8. Softening Point: the temperature at which the substance is softened. Mainly refers to the temperature at which the amorphous polymer begins to soften.

9. Dielectric dissipation Angle: also known as dielectric phase Angle, which reflects the phase difference between electric displacement and electric field strength of the dielectric medium under the action of alternating electric field. Dielectric phase Angle is an important index reflecting the insulation performance of high-voltage electrical equipment, and the change of dielectric phase Angle can reflect insulation defects such as moisture exposure, deterioration or gas discharge in insulation.

10. Volume Resistance Coefficient: which is the ratio between the potential gradient of the current direction and the current density in parallel materials, is expressed by Ω·cm; You can view it as volume resistance per unit volume.


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