细水雾扑救电气火灾有效性和安全性实验研究

为探究工作压力对高压细水雾扑救电气火灾有效性和安全性的影响，在 4 m × 4 m × 5 m 的封闭环境中，针对同一型号的细水雾喷头在不同喷射压力下进行灭火实验。结果表明：增大喷头工作压力可增强细水雾灭电气火的有效性；不同工作压力下的细水雾，绝缘电阻下降率不同；随着工作压力变大，绝缘电阻下降速度呈现先减小后增大的趋势；喷头工作压力超过一定值时，细水雾对绝缘电阻的影响更显著。对于特定高压细水雾喷头，存在灭火效果好且水渍污染小的适合工作压力。

Experimental study on the effectiveness andsafety of water mist in electrical fire fighting

In order to explore the influence of working pressure on the effectiveness and safety of high - pressure water mist in electrical fire fighting, the fire fighting experiment was carried out in the closed environment of 4 m× 4 m× 5 m for the same type of water mist nozzle under different spraying pressures. The results show that increasing the working pressure of the nozzle can enhance the effectiveness of the water mist to extinguish the electric fire; under different working pressure, the decrease rate of the insulation resistance is different; with the increase of working pressure, the decrease rate of the insulation resistance first decreases and then increases; when the working pressure of the nozzle exceeds a certain value, the influence of the water mist on the insulation resistance is more significant. For a specific high - pressure water mist nozzle, there is a suitable working pressure with good fire - fighting effect and small water damage.