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