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Unknown 18 June at At high temperature, the glass insulators are designed or manufactured by mixing the different types of materials, including quartz and lime powder, and then cools in the mold.
The main disadvantage of the glass insulator is, compared to the other type of insulators the contaminations are observed easily by the glass insulator and on the surface of the glass insulator, the moisture can be distilled easily. The polymer or polymeric insulator is also known as a composite insulator. It is a light-weight insulating material and has high mechanical strength. The disadvantage of the polymer insulator is if there is any unwanted gap between weather shed and core their moisture may enter.
The polymeric or polymer insulator has excellent properties they are hydrophobicity, lightweight, and anti-weather ability. The porcelain insulator is an aluminum silicate insulating material. In the present day, this material is used for the overhead insulator. The week in tension and poor shock resistance is the disadvantages of a porcelain insulator. The porcelain can also be called as ceramic. The applications of this insulator are distribution and transmission lines, isolators, transformer bushings, fuse units, plugs, and sockets.
All the insulators when used should not only behave as an insulator over a wide range of electric voltage but must strong mechanically. Therefore before selecting an insulating material, it is quite essential to know the various properties and their effects on insulation. The various properties of insulating materials are electrical properties, visual properties, mechanical, thermal, and chemical properties.
The electrical properties of insulating materials are divided into two types they are insulating resistance and dielectric strength. The insulating resistance is again classified into two types they are volume resistance and surface resistance. The factors affecting insulating resistance are temperature, aging, applied voltage and moisture and the factors affecting dielectric strength are temperature and humidity.
The visual properties of insulating material are appearance, color, and its crystallinity. The thermal properties of insulating material are melting point, flash, volatility, thermal conductivity, thermal expansion, and heat resistance. The various chemical properties of insulating material are resistance to external chemical effects, effects on other materials, chemical changes in the material, hygroscopicity, and aging.
The classification of insulating material is based on the thermal classification, physical classification, structural, chemical classification, and the process of manufacture. Thermally the insulators are classified into seven types or seven classes they are class-Y, class-A, class-E, class-B, class-F, class-H, and class-C.
The class-Y limitation temperature is C and the materials come under class-Y are cotton, paper, silk, and similar organic materials. The class-A limitation temperature is C and the materials come under class-A are impregnated paper, silk, polyamide, cotton, and resins. The class-E limitation temperature is C and the materials come under class-E are enameled wire insulation on the base of powdered plastics, polyvinyl epoxy resins, etc. The class-B limitation temperature is C and the materials come under class-B are inorganic materials impregnated with varnish.
The class-F limitation temperature is C and the materials come under class-F are mica, polyester epoxide varnished in the high heat resistance. The class-H limitation temperature is C and the materials come under class-H are composite materials on mica, glass, fiber, etc. The physical classification of insulating material is classified into three types they are solid, liquid, and gaseous.
The physical classification of insulators is shown in the below figure. The solid insulating materials are fibrous, ceramic, mica, glass, rubber, and resinous.
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