基于多重雷击保护的灭弧机理研究

Research on Arc-extinguish Mechanism Based on Multiple Lightning Protection

当重复雷击连续向输电线路放电时,将会对电网安全稳定运行造成毁灭性打击,导致连锁性反应的国民经济效益亏损。由于现有防雷措施缺乏针对多重雷击的防雷保护,笔者提出一种利用多重雷电脉冲触发爆轰反应一对一匹配重复雷击放电建弧过程的主动灭弧方法。建立了数学模型,对爆轰反应气流产物在灭弧腔内的作用效果进行理论分析与量化计算,并以此为依据对电弧与气流耦合过程进行仿真研究;提出并分析了重复雷击模型;最后通过灭弧实验验证灭弧装置对多重雷击防雷保护的可靠性。结果表明:爆轰反应气流场理论上能在1 L的刚性空间内维持高达131 MPa的强压2. 85 ms以上;仿真与实验电弧都在1 ms内可靠熄灭,能有大幅低雷击跳闸率;高压气流场可深度抑制重复雷击引发的多次建弧;固相灭弧装置具有较高的实际应用价值。

A devastating influence will attack the power grid if the repeated lightning strikes the transmission line,resulting in the collapse of the chain reaction of the national economic benefits. Because of the lack of lightning protection against multiple lightning strikes,an active arc extinguishing device using multiple lightning pulses to trigger the detonation reaction to match the repeated arc discharge process is proposed. The mathematic model is established to analyze and quantify the effect of the detonation reaction product in the arc chamber. Based on this,the simulation of the fluid coupling process is carried out. The repetitive lightning model is proposed and analyzed. Arc experiment to verify the reliability of arc protection device against multiple lightning protections. The experimental results show that the flow field of the detonation reaction can theoretically be maintained for more than 2. 85 ms in the rigid space of 1 L. The simulated and experimental arc is reliably extinguished in 1 ms; the high pressure airflow field can restrain the repetitive lightning stroke Arc; solid phase arc extinguishing device has a high practical value.