爆炸气流作用下暂态电弧自熄灭时间计算

Transient Arc Self-extinguishing Time Calculation with Explosion Airflow

爆炸气流是影响暂态电弧自熄灭时间的重要因素,为此,从电弧运动的角度出发,研究了利用爆炸气流灭弧装置产生的爆炸气流对电弧自熄灭时间的影响。利用链式电弧模型以及电弧自熄灭弧长判据,对在故障电流为1 k A时不同喷口角度、气流速度灭弧参数下的电弧自熄灭时间进行仿真计算,并与试验结果进行比较分析,研究结果表明:在气流速度为300 m/s、电流1 k A、喷口角度60o时,仿真中得出电弧自熄灭时间为0.3 ms,而试验中得出的电弧自熄灭时间为0.4 ms,仿真值与实际值基本相符。电弧自熄灭时间与爆炸气流速度有关,在相同的故障电弧电流的情况下,电弧自熄灭时间随着气流速度增大而减小。这说明了爆炸气流灭弧装置在灭弧性能上的可行性。

Explosion airflow is the important factor influencing the self-extinguishing time of transient arc. In the view of arc movement, we studied the self-extinguishing time of transient with the effect of explosion airflow caused by explosion airflow arc-extinguishing device. Moreover, we simulated and calculated the arc self-extinguishing time with different nozzle angles and explosion airflow velocities by using the chain arc model and the arc length criterion while the failure current is 1 kA, and compared it with the test result. The results show that the arc extinguishing time is 0.3 ms in the si- mulation, and the arc extinguishing time is 0.4 ms in the test when the flow velocity is 300 m/s, the current value is 1 kA, and nozzle angle is 60°. The simulation value is basically consistent with the actual one. The arc self-extinguishing time is related to explosion airflow speed. In the case of the same fault arc current, the arc self-extinguishing time decreases as the air velocity hlcreases. It means that the explosion airflow arc-extinguishing device＇s is feasible on arc-quenching performance.