【摘要】 为探究实际火灾场景中流淌火对不同种类电缆沟盖板耐火性能的影响机制，提升变电站火灾防控能力，开展流淌火作用下4种电缆沟盖板耐火性能试验以及标准试验炉试验。研究表明：在标准试验炉内2种高分子复合材料盖板在较短时间内失效，2种混凝土盖板2 h仍未失效。在模拟流淌火作用下的非标准试验中，卡槽式盖板背火面温升速率最快，砂浆抹面的混凝土盖板温升速率最慢。供油速度为72.5 g/s时，卡槽式盖板有效耐火时间在130 s左右，加铺防火布的高分子盖板有效耐火时间在40 min左右，2种混凝土盖板的有效耐火时间均超过2 h。加铺防火布的混凝土盖板背火面温升随供油速率增大而增大，但增速较小。砂浆抹面和加铺防火布的2种混凝土盖板耐火性能最优，卡槽式和加铺防火布的2种高分子复合材料盖板耐火性能较差。建议变电站变压器等充油设备附近电缆沟盖板采用混凝土盖板。更多还原

【Abstract】 In order to explore the impact mechanism of flowing fire on the fire resistance of different types of cable trench cover plates in the actual fire scene, and improve the fire prevention and control ability of substations, a series of fire resistance tests of cable trench cover plates under flowing fire and standard test furnace tests were carried out. The research shows that two kinds of polymer composite cover plates fail in a short time in the standard test furnace, while two kinds of concrete cover plates do not fail after 2 hours. In the non-standard test under simulated flowing fire, the temperature rise rate of the back fire surface of the grooved cover plate is the fastest, while that of the concrete cover plate plastered with mortar is the lowest. When the oil supply speed is 72.5 g/s, the effective fire resistance time of the slotted cover plate is about 130 s, and that of the polymer cover plate with fireproof cloth is 40 min. The effective fire resistance time of the two kinds of concrete covers is more than 2 h. The temperature rise on the back fire surface of the concrete cover plate with fireproof cloth increases with the increase of oil supply rate, but the increase rate is small. The two kinds of concrete cover plates with mortar plastering and fireproof cloth have the best fire resistance, while the two kinds of polymer composite cover plates with grooved and fireproof cloth have poor fire resistance. According to the test results, the concrete cover plate is recommended for the cable trench cover near the transformer and other oil filled equipment in the substation.更多还原