The gas discharge tube as a longitudinal (parallel) protection element has advantages of small parasitic capacitance, insulation resistance and discharge of lightning transient current capability, and is widely used in lightning protection of electronic system in. The working principle of gas discharge tube is the use of gas discharge, when the gas discharge tube between the poles by the lightning overvoltage generated by non-uniform electric field, in between, in this field, the tube gas began to free, when the applied voltage increases to the interelectrode insulating strength more than gas field, the gap between the poles will discharge breakdown, discharge lightning current, and the gas discharge tube from the insulating state into a conductive state. After conducting tube voltage between the poles to maintain the level of the residual voltage is determined in the arc discharge, the residual pressure is low, so as to avoid damage and discharge of electronic devices with parallel voltage. Because of the characteristics of the discharge tube‘s structure and working mechanism, the protection application there will be some problems. When the lightning overvoltage by gas discharge tube, in the power supply or signal voltage protected electronic system, the original in the discharge state of conduction tube may not arc, in the discharge tube of the flow, the flow has continued a great harm to the discharge tube. The use of multi gap gas discharge tube with low starting voltage, response characteristics of short time delay and residual voltage rise gradient of small, multi gap gas discharge tube used in lightning protection, some problems can be solved in traditional gas discharge tube.
The ICGS lightning wave generator impulse voltage processing frequency power for impact test, the lightning current is injected from Figure 2 anode, cathode grounding, lightning current in the range of 20 ~ 60kA, 0 degrees from the synchronous trigger angle, progressively increased to 30 degrees interval. Figure 5 is a multi phase gas discharge continuous flow test waveform at the phase of 90 DEG, and there is a significant continuous current between the GDT1 electrodes, and the value of the continuation value is larger. The value of GDT2 between the electrode is much lower than that in figure GDT1, which is close to 0. By using multi gap gas discharge tube can effectively reduce or even eliminate the damage of the traditional continuous flow gas discharge tube in the presence of lightning protection in.
Fig. 590 waveform of multi gap gas discharge continuous flow test
Paper summary:
Aiming at the disadvantages of the gas discharge tube in lightning protection, combining the Townsend theory and criminal law, and puts forward a multi gap gas discharge tube, and simulated lightning current impact testing of multi gap gas discharge tube, draws the following conclusion.
1, compared with the traditional gas the same material and electrode spacing tube, multi gap gas discharge tube around the breakdown voltage is 4 times smaller, the beta =0.25 breakdown voltage; the same time delay than traditional gas response under the impact of current discharge is small, and the response time can be shortened to about 200ns; the maximum residual pressure rising rate can be reduced by 0.3kV/ s.
Response time delay 2, multi gap gas discharge tube with impulse voltage decreases, and reaches a certain value tends to be stable; with the increase of impact current, residual pressure of multi gap gas discharge tube rising rate increase, the traditional gas and residual pressure is less than the same material and electrode gap discharge rise gradient.
3, multi gap gas discharge tube can effectively reduce or even eliminate the damage of the traditional continuous flow gas discharge tube in the presence of lightning protection in.
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