Study on the main transformer fire spread characteristics of ultra-high voltage station under different environment conditions
Ultra-high voltage(UHV)technology plays an important role in long-distance power transmission,but in recent years,transformer fires in ultra-high voltage substation occur frequently,resulting in serious consequences.For different environmental wind and firewall setting conditions,the fire spreading characteristics of UHV main transformer are studied,and the temperature field and thermal radiation distribution laws under the coupling conditions of ambient wind and firewall are discussed.The results show that the maximum heat release rate of the main transformer is about 70 MW at 150 s after ignition,and the fire growth rate coefficient can reach 3.11,which belongs to the category of ultra-fast fire.If the downwind firewall fails,the greater the ambient wind,the greater the risk that the downwind adjacent transformer will be ignited.If the upwind firewall fails,the greater the ambient wind,the higher the temperature above the downwind firewall.When the wind speed is 2 m/s,the temperature can reach 150 ℃,and the risk of ignition of substances above the firewall increases.In addition,this paper also analyzes and summarizes the temperature distribution law at the cable height(14 meters above the ground)above the main transformer.The results can provide a theoretical basis for the fire protection of the cable and the structure.
oil-immersed power transformerultra-high voltage stationfirewallwind intensity
NETL
NSTL
万方数据
