Optimized Arrangement of Cables in Cable Tunnel of Substation Considering Fireproof Performance

Cable tunnel fire is a major cause of accidents in substations. Nowadays, a large number of cables are spread out in cable tunnels of substations, and the cable layout in the cable tunnel is dense and non-standard way, which may be prone to a cable fire. In order to improve fireproof performance in cable tunnels of substations, numerical simulations of the fireproof performance of the cable tunnels were performed using the Fire Dynamics Simulator by changing the overall arrangement of the high-voltage cables in cable tunnels. The simulation results show that the temperature, CO and CO
2
concentrations, and fire heat release rate follow the same trend for each monitoring point under different layouts of high voltage cables in cable tunnels of substations. The heat release rate of cable fires is minimized when high-voltage cables are arranged in “one” and “triangle” types, with the interlayer distance being 0.65m and 1.15m respectively. Moreover, the preferred layout type may be the “triangle” type arrangement when laying cables in cable tunnels of substations. The paper provide an optimized arrangement method of cable in cable tunnels of substations.