内热源影响下高压电力电缆着火机制

doi:10.16265/j.cnki.issn1003-3033.2024.01.1133

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (1): 200-205.doi: 10.16265/j.cnki.issn1003-3033.2024.01.1133

内热源影响下高压电力电缆着火机制

王涛¹^,²(), 宋晓枫¹^,², 徐文淑¹^,², 安伟光¹^,²^,³^,^**()

¹ 中国矿业大学安全工程学院,江苏徐州 221116
² 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
³ 江苏省安全应急装备技术创新中心,江苏徐州 221100

收稿日期:2023-08-15 修回日期:2023-11-16 出版日期:2024-01-28
通讯作者:
**安伟光(1986—),男,河北无极人,博士,教授,博士生导师,主要从事重大基础设施火灾安全及应急救援方面的研究。E-mail:weiguang@cumt.edu.cn。
作者简介:
王涛 (1996—),男,安徽池州人,博士研究生,研究方向为固体材料燃烧及火蔓延特性。E-mail:tao_wang@cumt.edu.cn。
安伟光,教授
基金资助:
国家自然科学基金资助(51974298); 国家自然科学基金资助(52374244); 江苏省科技计划专项资金项目(BE2023049); 江苏省研究生科研创新计划项目(KYCX23_2844); 中国矿业大学研究生创新计划项目(2023WLKXJ134)

Ignition mechanism of high-voltage power cables under influence of internal heat source

WANG Tao¹^,²(), SONG Xiaofeng¹^,², XU Wenshu¹^,², AN Weiguang¹^,²^,³^,^**()

¹ School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
² Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
³ Jiangsu Safety Emergency Equipment Technology Innovation Center, Xuzhou Jiangsu 221100, China

Received:2023-08-15 Revised:2023-11-16 Published:2024-01-28

摘要/Abstract

摘要：

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。

关键词: 内热源, 高压电力电缆, 着火时间, 截面积, 表面温度

Abstract:

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.

Key words: internal heat source, high-voltage power cables, ignition time, cross-sectional area, surface temperature

中图分类号:

X928.7火灾与爆炸事故

王涛, 宋晓枫, 徐文淑, 安伟光. 内热源影响下高压电力电缆着火机制[J]. 中国安全科学学报, 2024, 34(1): 200-205.

WANG Tao, SONG Xiaofeng, XU Wenshu, AN Weiguang. Ignition mechanism of high-voltage power cables under influence of internal heat source[J]. China Safety Science Journal, 2024, 34(1): 200-205.

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内热源影响下高压电力电缆着火机制

Ignition mechanism of high-voltage power cables under influence of internal heat source

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