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内热源影响下高压电力电缆着火机制

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为探究高压电力电缆因过载或短路且线芯发热影响下的着火机制,使用加热棒模拟电缆内部故障热源,并开展电缆着火试验,分析内热源功率及电缆线芯截面积对电缆温升、着火时间等着火关键参数的影响,发现电缆从被加热至着火到燃烧的全过程可分为初期加热、热解气体逸出、着火、燃烧及熄灭4 个阶段.结果表明:绝缘层熔融物的滴落会导致火焰形态发生变化,电缆各结构层表面温度的升温速率随内热源功率的增加及与内热源表面距离的减小而增大,功率的增加弱化了电缆线芯截面积对各层升温速率的影响;电缆的着火时间与内热源功率呈线性递减的关系.
Ignition mechanism of high-voltage power cables under influence of internal heat source
In order to explore the spontaneous combustion mechanism of high-voltage power cables under the effect of core heating when it was overloaded or short circuited,heating rods was used to simulate the internal heat source for experimental research.The influence of the power of the internal heat source and the cross-sectional area of the inner core of the cable on the key parameters of the spontaneous combustion characteristics,such as cable temperature rise and ignition time,were analyzed.It was found the whole process of cable from heating to ignition to combustion can be divided into four stages:initial heating,pyrolysis gas escaping,ignition,combustion and extinguishment.The results show that the dripping of insulating layer melt leads to the change of flame shape.The heating rate of the surface temperature of each structural layer of the cable increases with the increase of internal heat source power and the decrease of the distance to the surface of the internal heat source.The increase in the power weakens the influence of the cross-sectional area of the inner core of the cable on the heating rate of each layer.The ignition time of the cable is linearly decreasing with the power of the internal heat source.

internal heat sourcehigh-voltage power cablesignition timecross-sectional areasurface temperature

王涛、宋晓枫、徐文淑、安伟光

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中国矿业大学 安全工程学院,江苏 徐州 221116

中国矿业大学 江苏省城市地下空间火灾防护高校重点实验室,江苏 徐州 221116

江苏省安全应急装备技术创新中心,江苏 徐州 221100

内热源 高压电力电缆 着火时间 截面积 表面温度

国家自然科学基金国家自然科学基金江苏省科技计划专项资金项目江苏省研究生科研创新计划项目中国矿业大学研究生创新计划项目

5197429852374244BE2023049KYCX23_28442023WLKXJ134

2024

10.16265/j.cnki.issn1003-3033.2024.01.1133

中国安全科学学报
中国职业安全健康协会

中国安全科学学报

CSTPCD北大核心
影响因子：1.548
ISSN：1003-3033
年,卷(期)：2024.34(1)
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