One-stop Service Provider for All Kinds of Tapes.

The fundamental functions of electrical insulation tape material

by:Kint      2020-03-12
Fundamental functions of electrical insulation tape material in order to prevent damage of the insulation of the insulating material function form, must make the function of insulation materials fit the national standard rules. And the function of the insulating material policy many, the characteristics of all kinds of insulation materials also vary, primary functions of common insulating materials have breakdown strength, heat resistance, insulation resistance and mechanical strength etc. ( 1) Breakdown strength. Insulating material above a certain value under the action of electric field intensity, damage and lost insulation function, this phenomenon is called breakdown. Insulation breakdown electric field intensity, called breakdown strength, the unit is: kV/mm. ( 2) Heat resistance. When the temperature rises, the insulation resistance, breakdown strength, mechanical strength and so on function will decline. Therefore, request insulation material under the rule of temperature can long time operation and insulation function to ensure reliable. Different composition of insulation material at different levels of heat resistant, heat resistant grades can be divided into Y, A, E, B, F, H, C and other seven grades, and insulating material rules of each level or the highest limit working temperature. Y, extreme butyl as temperature is 90 ℃, such as wood, cotton, paper fibers, cellulose acetate, acyl and other textiles and easy to heat differentiation and low melting point plastic insulation. Class A: limit operation temperature is 105 ℃, such as wire enameled wire, cloth, paint, oil paint, asphalt insulation, etc. E: limit working temperature is 120 ℃, such as glass cloth, oily resin paint, high strength wire, vinyl acetate, heat resistant enameled wire insulation, etc. B: limit working temperature is 130 ℃, such as polyester thin wax, mica and glass fiber treated by corresponding resin, asbestos, polyester paint, polyester enameled wire insulation, etc. F: limit working temperature is 155 ℃, such as with F class insulation resin adhesive or after impregnation, coating, mica, glass, asbestos, glass cloth laminated products as well as for the above material foundation, mica, powder products, polyester chemical better thermal stability and acid materials, composite and silicone polyester paint. Class H: limit working temperature is 180 ℃, such as thickening F material, mica, organic silicon mica products, silicon polyimide composite glass cloth, paint, silicone rubber compound film and polyimide coating, etc. Class C: limit operation temperature greater than 180 ℃. Don't choose any organic binder and inorganic impregnant, such as quartz, asbestos, mica and glass, ceramics and tetrafluoroethylene plastic, etc. ( 3) Insulation resistance. Insulation the resistance value of insulation resistance, general state, the insulation resistance is generally more than tens of ohms. Insulation resistance due to temperature, thickness, surface condition ( Water, dirt, etc. ) Will there is a big difference. The resistivity of insulating materials is very high, but in must under the action of the voltage. There is always a small current through, this is called the leakage current. ( 4) Mechanical strength. According to the specific requirements of various insulating materials, corresponding rules of tensile, compressive, bending, shear, tear resistance, impact resistance and strength of the policy, collectively known as mechanical strength. ( 5) Other features. Some insulation materials in liquid method, such as all kinds of insulating varnish, its characteristic policy including fixed content, acid value, viscosity, drab and gel time, etc. Some insulation features guidelines on permeability, oil resistance, elongation, shortening rate, solvent resistance, arc resistance, etc. Insulation aging of insulation materials in electric field under the action of polarization will occur, conductivity, dielectric breakdown physical phenomena, such as fever, in together with electric fields, but also under the influence of mechanical, chemical, and many other elements, long _T ageing phenomenon will appear. Therefore, many problems often occur in the insulating part of the electrical products. Dielectric aging refers to the dielectric electric utility in the long run, mechanics function gradually with the increase of time of the degradation phenomenon. Its primary aging method has electrical aging, thermal aging and aging environment, etc. ( 1) Electrical aging. See more at high voltage electric equipment, the primary reason is that the insulation materials in high pressure under the action of partial discharge. ( 2) Thermal aging. Insulating material internal composition oxidation, cracking, metamorphosis, hydrolysis reaction with water and gradually lose insulation function. ( 3) Aging of the environment. Also known as atmospheric aging, is due to ultraviolet radiation, ozone, salt fog, acid and alkali chemical aging caused by the elements such as dirty. Meanwhile. Ozone is the responsibility of the electrical equipment corona or partial discharge. Insulation material in the event of the aging and its insulation function is generally unrecoverable, commonly used in engineering of the following methods to prevent the aging of the insulating material. ( 1) Add people to the insulating material production process stabilizer. ( 2) Outdoor use insulating material can increase the uv absorber, or use the interlayer isolation sunshine. ( 3) Hot and humid zone using insulation materials, can mould inhibitor. ( 4) Strengthen against corona, electrical equipment part of partial discharge method content from the network, there are wrong please contact us to adjust
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...