Numerical simulation method for fire caused by cable faults in tunnel

A cable fault and numerical simulation technology, applied in the field of fire risk analysis, can solve problems such as large errors in fire electrical faults, and achieve the effect of improving accuracy

Active Publication Date: 2020-05-15
国网陕西省电力公司西安供电公司 +3
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  • Claims
  • Application Information

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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 simulatio

Method used

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  • Numerical simulation method for fire caused by cable faults in tunnel
  • Numerical simulation method for fire caused by cable faults in tunnel
  • Numerical simulation method for fire caused by cable faults in tunnel

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Embodiment Construction

[0037] The present invention is a numerical simulation method of fire caused by cable fault in tunnel, which collects physical structure of cable tunnel in fire and laying data of cables in tunnel, establishes three-dimensional model of cable tunnel, imports the three-dimensional model into FDS software, Establish a physical model for tunnel fire simulation.

[0038] The electrical fault model of the faulty cable is established, and the initial fire source model of the cable tunnel fire is determined according to the cable electrical fault model, including the location, area, power and duration of the initial fire source.

[0039] The initial fire source model, the cable laying method in the cable tunnel, the structure and composition of the cable, and the law of horizontal and vertical spread of the flame are imported into the FLASH-CAT model to determine the change of the heat release rate with time when the fire occurs in the cable tunnel, and get Ignition source model for ...

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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...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06T17/00G06F111/10
CPCG06T17/00
Inventor 苏小婷弓启明刘素蓉吕亮林涛郑建康蒲路刘子瑞张燕涛梁战伟赵学风徐阳
Owner 国网陕西省电力公司西安供电公司
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