爆轰气流耦合电弧的仿真与试验

Simulation and Experiment of Detonation Airflow Coupling Arc

为了有效地防止输电线路雷击跳闸,研究了一种主动、快速截断电弧的爆轰气流灭弧防雷装置,该装置并联安装在绝缘子两端,当发生雷击时,上下电极之间产生工频电弧,同时信号采集装置采集到雷电脉冲,雷电脉冲触发灭弧能量团爆炸产生的爆轰气流熄灭电弧。通过运用软件AUTODYN仿真分析得到近似理想状态下爆轰气流灭弧防雷装置在0.08 ms以内熄灭电弧;搭建试验电路进行灭弧试验,用摄像机观测得出爆轰气流灭弧时间为0.4 ms。仿真与试验得出的灭弧时间都小于继电保护动作的时间,从而说明爆轰气流灭弧装置具有良好的熄弧特性。

In order to prevent the lightning trip-out of transmission line effectirely, an active and fast detonation airflow arc-extinguishing device is developed, the devices are installed in parallel at both ends of the insulator. Power frequency arc is formed within the protection gap when the lightning strike on it. The lightning pulse is collected by the signal acquisition, which immediately ignites the are-extinguishing device to produce the detonation airflow synchronously to extinguish the follow-up power frequency arc. It is obtained from the simulation results that the arc extinguishing time by detonation airflow under approximate ideal condition is shorter than 0.08 ms. The simulation results are obtained by using software AUTODYN. The experimental circuit is set up to conduct arc extinguishing test, the denotation airflow arc-extinguishing time is 0.4 ms, which can be observed by video camera. And both above-mentioned arc distinguishing times are much shorter than the response time of relay protection. Thus it is proved that the detonation airflow arc-extinguishing device has good arc-quenching characteristics.