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Porcelain insulators, also called ceramic insulators, are made from Clay, Quartz or Alumina and Feldspar, and are covered with a smooth glaze to shed water. The function of porcelain insulators is to provide insulation in electrical circuits by physically separating the conductors as well as preventing current flow between them. It can also provide mechnical support for conductors.

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Insulators of ceramicc material and steep wave front impulse test on high voltage insulators. Standard: IEC61211(1994)

RTV silicone anti-pollution flashover coatings have been used extensively for years – initially mainly on post insulators and bushings at substations and more recently also for porcelain or glass string insulators on transmission lines.