A porcelain insulator is an insulating device used in overhead transmission lines, manufactured from electrical porcelain-which serves as the primary insulating material-through a high-temperature sintering process. Within power systems, these insulators function to support and secure live conductors while providing electrical isolation from the ground or other conductors at different potentials.
A typical porcelain insulator consists of three components: a metal cap (made of malleable cast iron), a porcelain body, and a steel pin (made of low-carbon steel); the metal parts are bonded to the porcelain body using a cement-based adhesive. Their primary role is to provide mechanical support and electrical insulation for electrical equipment and conductors within power transmission and distribution lines.
Major product categories for line porcelain insulators include suspension, spool (butterfly), and post types. They are applied across voltage levels ranging from 35 kV to 1000 kV, spanning low, medium, high, and even ultra-high voltage (UHV) applications. Based on protection characteristics, they can be classified into types such as standard and anti-pollution.
