Abstract
To avoid the restriction of the arc energy on the energy quenching of an arc and rapidly quench the arc to restore the insulation characteristics of the gas, the process of arc quenching by an explosion air shock wave is studied in this paper. The interaction between an explosion air shock wave and an arc is considered inside a cylinder structure so that concentrated pressure and airflow velocity can be produced. First, a coupling model of the explosion air shock wave and arc is developed theoretically. Second, according to the model, the explosion air shock wave and arc are simulated by finite element simulation software. It is found that the interaction between the explosion air shock wave and arc is most intense at 0.04 ms, the arc is driven out of the cylinder at 0.087 ms, and then, the arc is gradually quenched. Finally, the test results show that the arc is completely quenched at approximately 0.80 ms, and the value of the peak current is 1 kA. Although there is error between the simulation and test results, the effectiveness of the explosion air shock wave in quenching the arc is still verified, and the arc is quenched over a time scale of milliseconds.
Highlights
In recent years, the influence of lightning strike accidents on power grid safety has become increasingly prominent, and the shortcircuit tripping rate caused by lightning strikes has been very high, accounting for more than 70%
In Ref. 4, based on a gas-blown arc motion, an arcing horn was invented; the arc is affected by the release of gas from the organic molecular material in the pipeline, but its arc quenching capability is limited by the influence of the gas production
The arc quenching capability of these lightning protection devices is restricted by the arc energy, so the devices are more commonly used for middle- and low-voltage grades
Summary
The influence of lightning strike accidents on power grid safety has become increasingly prominent, and the shortcircuit tripping rate caused by lightning strikes has been very high, accounting for more than 70%. Many countries are studying lightning protection devices that can effectively quench the arc, with the goal of quenching the arc as rapidly as possible and restoring the insulating characteristics of the gas. Scitation.org/journal/adv capability, the influence of the pressure and airflow velocity produced by an explosion air shock wave on arc quenching is studied in this paper. The effectiveness of the explosion air shock wave in quenching the arc is verified by a test, and the cause of the error between the simulation and test results is analyzed. These findings provide a reference for the study of the coupling effect of the blast air shock wave and arc in future theories, simulations, and tests
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