This product is suitable for the insulation support of overhead lines, and has the function of preventing the overhead insulated wires from being broken by lightning strikes, the porcelain insulation being blown up, and reducing tripping due to lightning strikes. The principle is: when the lightning overvoltage exceeds a certain insulation blocking value, it will cause a flashover discharge between the arc rod and the steel foot of the lightning protection column, forming a short-circuit channel, and the subsequent power frequency arc will burn at the discharge gap. to protect the wires from being burned.