Insulation parts and insulating structures consisting of heat shrinkable tube insulating materials shall bear one or both forms of mechanical load, such as: Jiulazhong, heavy pressure, distortion, bending, concussion, etc. Therefore, the insulating material itself is required to have a certain mechanical strength.
The mechanical strength of the thermal shrinkage casing insulating material generally decreases with the increase of temperature and humidity. As for moisture absorption high materials (such as organic fibers, insulating paper, etc.), the decline is even greater. Therefore, when determining the mechanical strength of the insulating material, it is subject to the specified temperature and humidity, such as special insulating tubes.
Some of the names used to denote the mechanical strength of insulating materials and their meanings are as follows:
1. Anti-cutting strength
It represents the comprehensive ability of solid insulating materials to resist thorns, rub and grind under specified temperature, pressure and vibration. For windings in the groove or line inch color edge, it refers to the ability to resist burr damage.
2. Tensile, compressive, flexural strength
They represent solid insulating materials under static conditions, bearing a gradual increase in tension, pressure, bending force until the maximum load at the time of failure (expressed in kg/cm ²)
3. Impact strength
It indicates the ability of the material to withstand the power load. The strength is expressed in the work of the Unit cross-sectional area of the material when it is damaged by impact (in kilograms, cm/cm ²)
4. Seismic resistance
It indicates that the material is shaken at a specific frequency and speed and does not alter the performance of the original physical and mechanical properties.
5. Viscosity (viscous strength)
It indicates the properties of the methylenetin material that can be glued to the B material. The viscosity strength is expressed as the force (or the rate of detachment) used by the Methylenetin material when it is detached from the B material (expressed in kg/cm ²).
It indicates the ability of the material (surface layer) not to deform after being pressed. For coatings and lacquer films, the standard Hammer is allowed to fall from the specified height onto the material coating or lacquer film, and the hardness is indicated by the height of the hammer rebound. For flexible and plastic materials (such as bitumen), the amount of "needle degree" is often used as a hardness indicator. Needle entry-is the application of a certain force to the standard needle, so that it in the specified time n11 into the material, the depth of the puncture is called the needle degree.
7. Elastic and elastic modulus
Elasticity refers to the ability of a material to restore its original shape after the deformation stress has been eliminated. Elastic modulus refers to the ratio of stress of material to strain when the material is elastic strain.
8. Strength of Resistance
It indicates the degree of bonding between laminated insulating materials. High anti-splitting strength of the material, not easy to crack, the starting layer, can be good processing performance. For long-term vibration and torque load insulation 0, components, such as high-voltage switch pull rod, motor stator, rotor groove wedge, etc., the use of high perturbation strength insulation materials.
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