The types and structures of surge protectors vary according to different uses, but at least one nonlinear voltage limiting element should be included. The basic components used for surge protector are: discharge gap, gas-filled discharge tube, varistor, suppression diode and choke coil.
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Development course of surge protector;
The original claw notch of surge protector appeared at the end of19th century, which was used for overhead transmission lines to prevent lightning from damaging equipment insulation and causing power failure. In the 1920s, aluminum surge protectors, oxide film surge protectors and pill surge protectors appeared. In 1930s, tubular surge protectors appeared.
Silicon carbide arrester appeared in 1950s. In 1970s, metal oxide surge protectors reappeared. Modern high voltage surge protectors are not only used to limit overvoltage caused by lightning in power system, but also used to limit overvoltage caused by system operation.
Starting from 1992, the industrial control standard 35mm guide rail snap-in pluggable SPD lightning protection module represented by Germany and France was introduced to China on a large scale, and then the integrated box power supply lightning protection combination represented by the United States and Britain also entered China.
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