High-voltage power cable autonomous fireproof method and system based on gas composite filling, and cable

Abstract

The invention discloses a high-voltage power cable autonomous fire prevention method and system based on gas composite filling and a cable, and the method comprises the steps: screening out a fire extinguishing medium from candidate gas based on a predefined fire extinguishing efficiency database, a diffusion characteristic database and a material compatibility database, the fire extinguishing medium comprises one or more of nitrogen, carbon dioxide and heptafluoropropane; based on a pre-constructed digital three-dimensional model of a cavity between a buffer layer and a metal sheath, flow processes under different gas ratios are simulated through fluid dynamic simulation, and an optimal gas mixing ratio is iteratively calculated by taking pressure balance time and an outlet flow rate as core optimization targets; and on the basis of the optimal gas mixing ratio, gas release processes and fire extinguishing response speeds under different filling pressures are simulated through coupling simulation and pre-stored oxygen content experimental data, and then filling pressure parameters are determined. The fireproof door has the advantages of good fireproof performance and the like.

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