Experimental study on fire resistance of four kinds of cable trench cover plate

doi:10.16265/j.cnki.issn1003-3033.2023.03.0099

Abstract

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.

Key words: substation fire accident, cable trench cover plate, fire resistance, flowing fire, average temperature rise

SUN Tao, ZHANG Jiaqing, XIE Jia, XU Linzhi, ZHOU Yong, FAN Minghao. Experimental study on fire resistance of four kinds of cable trench cover plate[J]. China Safety Science Journal, 2023, 33(3): 83-89.

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盖板类型	盖板A			盖板B			盖板C						盖板D
工况	A-1	A-2	A-3	B-1	B-2	B-3	C-1	C-2	C-3	C-4	C-5	C-6	D-1	D-2
供油速率/ (g·s^-1)	101.5	72.5	72.5	101.5	72.5	72.5	101.5	87	72.5	58	72.5	72.5	72.5	72.5
试验类型	预试验	正式试验	正式试验	预试验	正式试验	正式试验	预试验	正式试验	正式试验	正式试验	正式试验	正式试验	正式试验	正式试验
供油时间/min	—	—	—	—	—	—	—	40	40	40	40	120	40	120

检测项目	盖板A	盖板B	盖板C	盖板D
承载能力	≥ 4	≥ 31	≥ 121	≥ 121
完整性	≥ 4	≥ 31	≥ 121	≥ 121
隔热性	4 (181 ℃)	31 (148 ℃)	≥ 121 (58.7 ℃)	≥ 121 (108 ℃)

盖板类型	盖板A		盖板B		盖板C		盖板D
工况编号	A-2	A-3	B-2	B-3	C-5	C-6	D-1	D-2
试验结束时的盖板状态	拼接处出现缝隙	拼接处出现缝隙	拼接处出现缝隙	拼接处出现缝隙	完整	完整	砂浆层出现破裂	砂浆层出现破裂
失效时间	124 s	135 s	2 502 s	2 241 s	> 40 min	> 120 min	> 40 min	> 120 min
最高温度/℃	—	—	—	—	51.6	125.4	48.7	107.4
平均温度/℃	—	—	—	—	24.3	93.1	24.4	86.2

供油速率/ (g·s^-1)	工况编号	最高温升/ ℃	平均温升/ ℃
87	C-2	49.3	26.7
72.5	C-3	47.6	24.3
58	C-4	36.7	21.2