The function of lightning protection module is to protect various electrical equipment in the power system from damage caused by lightning overvoltage, switching overvoltage, and power frequency transient overvoltage. The types of lightning protection modules mainly include protective gaps, valve type lightning protectors, and zinc oxide lightning protectors. The protective gap is mainly used to limit atmospheric overvoltage, and is generally used for protection of distribution systems, lines, and substation incoming sections. Valve type lightning arrester and zinc oxide lightning arrester are used for the protection of substations and power plants. They are mainly used to limit atmospheric overvoltage in 500KV and below systems, and will also be used to limit internal overvoltage or serve as backup protection for internal overvoltage in ultra-high voltage systems.