surge protection device SPD

The most original lightning arrester is the claw gap, which appeared at the end of the 19th century. It is used for overhead transmission lines to prevent lightning damage to equipment insulation and power failure, so it is called "lightning arrester". In the 1920s, aluminum lightning arrester, oxide film lightning arrester and shot lightning arrester appeared. In the 1930s, tubular lightning arrester appeared. Silicon carbide lightning arrester appeared in the 1950s. In the 1970s, metal oxide lightning arrester appeared again. Modern high-voltage lightning arrester is not only used to limit the overvoltage caused by lightning in power system, but also used to limit the overvoltage caused by system operation.