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Working principle of gas discharge tube

When the applied voltage increases to more than the insulation strength of the gas, the gap between the two poles will be penetrated by the discharge shock, and the original insulation state will be transformed into the conductive state. After the conduction, the voltage between the two poles of the discharge tube will be maintained at the residual voltage level determined by the discharge arc.
The main components of the five pole discharge tube are basically the same as those of the two pole and three pole discharge tubes, which have good discharge symmetry and can be applied to the protection of multiple lines. (often used in the protection of communication lines) the discharge dispersion of bipolar discharge tube is relatively large. When bipolar discharge tube is used, common mode overvoltage may be converted into differential mode overvoltage. The normal operating voltage of the system added at both ends of the discharge tube in the system shall be lower than the voltage to maintain the discharge, otherwise the continuous current problem will occur. The voltage value of maintaining glow discharge is larger than that of maintaining arc discharge.




The normal operating voltage of the system added at both ends of the discharge tube in the system shall be lower than the voltage to maintain the discharge, otherwise the continuous current problem will occur. The voltage value of maintaining glow discharge is larger than that of maintaining arc discharge.
The measurement method of maintaining the voltage value of tube discharge. Different kinds of discharge tubes have great difference in maintaining discharge voltage. Generally in practical application, it is not easy to generate continuous current in the glow discharge area, and it may generate continuous current in the arc area (because the voltage required to maintain the continuous current in the arc area is smaller than the voltage required to maintain the glow discharge). At this time, current limiting measures should be taken (for example, the resistor with positive temperature coefficient, fuse, and varistor can be used in series).



The working principle of gas discharge tube can be simply summed up as gas discharge. When enough electricity is generated between the two stages, the gap between the two poles will be discharged and shocked through, and then it will change from insulation state to conductive state, which is similar to short circuit. When it is in conductive state, the voltage between the two poles will be lower, generally between 20-50v, so it can play a good role in protecting the later stage circuit.
The gas discharge tube is sealed with ceramic, and the inner part is composed of two or several metal electrodes with gaps, which are filled with inert gas (argon or neon). When the voltage added to the two extremes reaches the point where the gas in the gas discharge tube breaks down, the gas discharge tube begins to discharge and changes from high resistance to low resistance, so that the voltage at both ends of the electrode does not exceed the breakdown voltage.