主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (2): 168-171.

• • 上一篇    下一篇

过电流铜包铝导线线芯发热及绝缘燃烧规律研究

林庆文1，王鑫玉1，李阳1，冯骁2，何芬芬1   

  1. 1．中国人民警察大学，河北廊坊065000；2．苏州市消防救援支队，江苏苏州215000
  • 出版日期:2021-02-15 发布日期:2021-02-15
  • 通讯作者: 李阳，男，中国人民警察大学火灾物证鉴定中心副教授。
  • 作者简介:林庆文（1997-），男，黑龙江牡丹江人，中国人民警察大学火灾物证鉴定中心硕士研究生，主要从事火灾调查研究，河北省廊坊市西昌路220 号，065000。
  • 基金资助:
    中国人民警察大学校级科研重点专项项目（2019sycxpd001）

Core heating and insulation combustion rules of overcurrent copper clad aluminum wire

LIN Qing-wen1, WANG Xin-yu1, LI Yang1, FENG Xiao2, HE Fen-fen1   

  1. 1.China People's Police University，Hebei Langfang 065000，China; 2.Suzhou Fire and Rescue Detachment，Jiangsu Suzhou 215000，China
  • Online:2021-02-15 Published:2021-02-15

摘要：

为准确研究铜包铝导线在不同过电流值条件下的线芯发热及绝缘燃烧现象。以2.5 mm2 PVC 多股铜包铝导线为研究对象，分别模拟导线发生40、50、60、70、80 A 过电流故障，利用高速影像及视频分析技术研究过电流导线线芯发热、熔断、电弧引燃及绝缘燃烧随电流值的变化规律。结果表明：当过电流值小于40 A 时，导线仅线芯发热、绝缘热解发烟，不会出现线芯熔断现象；当过电流值大于50 A 时，导线的线芯发热加剧，熔断时间越来越短，由50 A 时的平均120.8 s 降为了80 A 时的19.8 s；当I=50 A 时，电弧引燃周围的热解气体，形成最大8.4 cm 范围内的燃烧，当I≥60 A 时，电弧引燃后的火焰会蔓延至导线左端和右端，但火焰的蔓延速率随着电流值的升高先加快再减慢，70 A 时最快，平均可达7.13 m/s。

关键词: 电气火灾, 过电流故障, 铜包铝导线, 线芯发热, 绝缘燃烧

Abstract:

In order to accurately study the phenomena of core heating and insulation burning of copper- clad aluminum wire under different overcurrent conditions. Taking 2.5 mm2 PVC multi- strand copper-clad aluminum wire as the research object, the over current faults of 40, 50, 60, 70, 80 A were simulated respectively, the changes of core heating, fusing, arc ignition and insulation burning of overcurrent conductor with current value were studied by using high-speed image and video analysis technology. The results show that when the over current value is less than 40 A, only the core of the wire is heated and the insulation is pyrolyzed and fumed, the core is not blown. When the over current value is greater than 50 A, the heating of the wire core is intensified and the fusing time is getting shorter and shorter from the average of 120.8 s in 50 A to 19.8 s in 80 A. When I=50 A, the arc ignites the pyrolytic gas around which forms combustion within the maximum range of 8.4 cm. When I≥60 A, the flame ignited by the arc will spread to the left and right ends of the conductor, but the flame spreading rate will first accelerate and then slow down with the increase of current value, it will be the fastest at 70 A with an average of 7.13 m/s. 

Key words:  electrical fire, overcurrent fault, copper clad aluminum wire, core heating, insulating combustion