Lightning protection device

The utility model discloses a lightning protection device contains: the insulator is used for holding overhead line, lightning arrester body, it sets up on the insulator, after overhead line's voltage is higher than the threshold value, punctures air gap and switch on lightning arrester body, release overvoltage energy. Lightning arrester body contains: base, its cover are put and are served under the insulator, the insulating tube, its one end and base link to each other, and in the insulating tube in proper order the interval be provided with a plurality of cavity electrode and a plurality of explosion chamber, the fumarole has been seted up corresponding to every explosion chamber top. The utility model discloses utilize high velocity gas to blow the outage arc to the reliable of electric power system transmission line and safety are guaranteed to effectual cutting off because of the discharge arc that the circuit overvoltage arouses, through operation indicator, indicating line passes by the pressure simu