Numerical simulation method for fire caused by cable faults in tunnel

Abstract

The invention discloses a numerical simulation method for a cable fire caused by an electrical fault in a tunnel. The method includes the following steps of , according to the structure of a cable tunnel and the laying condition of cables in the tunnel, establishing a physical model of the cable tunnel; determining an initial fire source model causing a cable tunnel fire according to the positionand the fault type of the fault cable in the cable tunnel; inputting the initial fire source model, the laying condition of the cable in the cable tunnel and the like into a FLASH-CAT model; the real-time heat release rate of the fire source in the tunnel can be obtained; establishing a fire source model of the cable tunnel fire; directly importing the fire source model into fluid dynamics calculation software FDS; and setting material characteristics and boundary conditions of the cable tunnel model in the FDS, dividing grids, and performing numerical calculation to obtain time-varying rulesof temperature, smoke concentration, flame propagation, CO concentration and the like in the cable tunnel, thereby realizing risk assessment of the cable tunnel fire.

Description

technical field [0001] The invention belongs to the field of safe operation of power lines and is suitable for fire risk analysis of power cable tunnels. Background technique [0002] In recent years, with the rapid development of the economy and the continuous improvement of the level of urbanization, the urban power grid transmission system has mainly developed from overhead lines to cables. Due to the relatively closed environment of the cable tunnel, it is difficult to inspect and inspect. With the increase of the operation period, power cable fire accidents occur frequently and the consequences are serious. There are many cases at home and abroad about fires in cable tunnels causing serious consequences. For example, on June 18, 2016, a fire broke out in a cable tunnel outlet in a certain place, resulting in fires in 110kV substations and 330kV substations. 10,000 kW; On October 5, 2014, the 11kV feeder of a 11kV&33kV cable tunnel in a substation in a certain place cau...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the electrical faults that cause fires that have not been considered in the current cable tunnel fire simulation and the large error caused by adopting a fixed fire source model in the cable tunnel fire, and provide an effective method for the risk assessment of cable tunnel fires

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