A gas discharge tube and overvoltage protection device

Abstract

The embodiment of the invention discloses a gas discharge tube and an overvoltage protection device. The gas discharge tube comprises a sealing discharge cavity and at least two conductive electrodes,wherein the inner portion of the sealing discharge cavity is filled with discharge gas; discharge electrode faces of the at least two conductive electrodes are located on the inner surface and / or inner portion of the sealing discharge cavity; the sealing discharge cavity comprises at least one telescopic part, and the at least one telescopic part seals partial regions of the sealing discharge cavity; the at least one telescopic part is used for discharging between the at least two conductive electrodes, so that when the discharge gas is heated to expand, the at least one telescopic part stretches or retracts to enlarge a discharging gap between the discharge electrode faces of the at least two conductive electrodes, and so that the follow current of the gas discharge tube is blocked. According to the technical scheme of the gas discharge tube and the overvoltage protection device, effective overvoltage protection can be realized, and after the overvoltage disappears, the follow current flowing through the gas discharge tube can be automatically and effectively blocked.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection, in particular to a gas discharge tube and an overvoltage protection device. Background technique [0002] Lightning strikes will cause surge interference to external power supply lines. In addition to lightning strikes in nature, switching actions in substations and other places will also introduce surge interference, such as: interference when the main power system is switched; the same power grid, the interference formed when some small switches near the power receiving equipment jump; Switching thyristor equipment with resonant lines; various systematic faults, such as short circuits and arcing faults between equipment grounding networks or grounding systems. [0003] The gas discharge tube includes an insulating tube body and two conductive electrodes that are respectively sealed and connected to two ends of the insulating tube body to form a discharge inner cavity, and the di...

AI Technical Summary

Problems solved by technology

[0004] When the gas discharge tube is used for lightning strike or overvoltage protection, the gas discharge tube presents a low resistance state after being subjected to the lightning strike or overvoltage, short-circuits the equipment connected in parallel with it, and discharges the surge current; when the overvoltage disappears, the gas discharge tube Under the action of normal power supply voltage, the discharge is still continuous, and the continuous flow cannot be automatically broken, which will eventually cause the gas discharge tube to short circuit or burst, and even cause the protected equipment to burn and cause fire and other accidents.

Images