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High voltage porcelain insulator is used to support or suspension high voltage conductor from the ground to isolate the role of a special kind of insulator. Due to the relatively stable performance of the insulation of electrical porcelain insulators, not afraid of the wind, sun, rain, so a variety of high-voltage transmission and distribution equipment (especially for outdoor use), the widespread adoption of high-voltage porcelain as insulation, such as: overhead wires must be hanging by insulator insulation on poles to ensure a long 500km 330kV transmission line insulator strings about 140,000. The other type of high voltage insulators high voltage bushing, when the high-voltage wires through the walls or the leads from the transformer tank, need high voltage bushing as insulation. In addition to the high-voltage porcelain as an insulator, silicone rubber material-based synthetic porcelain insulators also widely used.