Abstract
The gas discharge tube will ablate the electrode under the condition of multiple discharges, thereby affecting the working performance of the gas discharge tube. In order to study its electrode ablation characteristics and life characteristics, a gas discharge tube experiment platform was built, and the gas discharge tube was subjected to different times of cumulative discharge experiment. By measuring the DC breakdown voltage and insulation resistance, the life assessment is carried out, and electrode morphology changes are observed. The results show that: as the number of discharges increases, the DC breakdown voltage of the gas discharge tube first increases and then decreases, and the insulation resistance first remains stable and then decreases; when the DC breakdown voltage drops below 50% of the initial voltage, the insulation resistance drops to kΩ level. At this time, the gas discharge tube fails due to short-circuit; at this time, there are many sputtering particles, protrusions and ablated molten blocks on the anode, and the cathode is severely ablated, with pits appearing in a molten state.
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