基于SEM的多股铜导线过电流故障鉴别研究
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摘要
为研究火灾中过电流故障条件下铜导线的痕迹特征,模拟火灾条件,制备了过电流多股铜导线样品,利用扫描电镜(SEM)对线芯表面的微观组织进行了观察,并与未通电的原始导线进行了对比。结果表明,随着过电流程度的加重,线芯表面依次呈现出剥离脱落、块状开裂、珊瑚状小颗粒等典型痕迹;在明火燃烧和热辐射作用下,过电流线芯表面分别出现大块熔结和波浪状熔流痕迹。试验结果可为火灾物证鉴定和火灾调查提供参考。
In order to study the trace characteristic of copper conductors under overcurrent faults, simulating the fire condition, the multi stranded copper wires were prepared. The microstructure of the wire surface was observed by scanning electron microscopy(SEM), which was compared with the original wire sample without electricity. The results show that with the increase of the degree of overcurrent, the core surface generates peeling off, massive cracking, tiny coral-like particle and other typical traces in turn. Under the action of open flame combustion and thermal radiation, the surface of the overcurrent core generates large melting and wavy flow traces, respectively. The experimental results can provide references for fire material evidence identification and fire investigation.
In order to study the trace characteristic of copper conductors under overcurrent faults, simulating the fire condition, the multi stranded copper wires were prepared. The microstructure of the wire surface was observed by scanning electron microscopy(SEM), which was compared with the original wire sample without electricity. The results show that with the increase of the degree of overcurrent, the core surface generates peeling off, massive cracking, tiny coral-like particle and other typical traces in turn. Under the action of open flame combustion and thermal radiation, the surface of the overcurrent core generates large melting and wavy flow traces, respectively. The experimental results can provide references for fire material evidence identification and fire investigation.
引文
[1]杨晓红,马子宁,赵辉.电气火灾中导线熔痕的成因及形态特征的研究[J].东北电力技术,2006(5):15-19.
[2]GB/T16840.1-2008电气火灾痕迹物证技术鉴定方法第1部分:宏观法[S].
[3]GB/T16840.6-2012电气火灾痕迹物证技术鉴定方法第6部分:SEM微观形貌分析法[S].
[4]Zhang Hui,Zhang Honggang,Peng Dashu.Hot deformation behavior of KFC copper alloy during compression at elevated temperature[J].Transactions of Nonferrous Metals Society of China,2006(6):526-566.
[5]张辉.单股铜导线过载残留物的断口形貌[J].分析仪器,2012(2):59-63.
[6]张金专.过负荷时间和倍数对铜导线金相组织的影响[J].消防科学与技术,2009,28(7):543-545.
[7]舒中俊,李丽,张克俭,等.过电流对线缆绝缘破坏的影响[J].消防科学与技术,2012,31(5):450-453.
[8]GB/T16840.5-2012电气火灾痕迹物证技术鉴定方法第5部分:电气火灾物证识别和提取方法[S].
[2]GB/T16840.1-2008电气火灾痕迹物证技术鉴定方法第1部分:宏观法[S].
[3]GB/T16840.6-2012电气火灾痕迹物证技术鉴定方法第6部分:SEM微观形貌分析法[S].
[4]Zhang Hui,Zhang Honggang,Peng Dashu.Hot deformation behavior of KFC copper alloy during compression at elevated temperature[J].Transactions of Nonferrous Metals Society of China,2006(6):526-566.
[5]张辉.单股铜导线过载残留物的断口形貌[J].分析仪器,2012(2):59-63.
[6]张金专.过负荷时间和倍数对铜导线金相组织的影响[J].消防科学与技术,2009,28(7):543-545.
[7]舒中俊,李丽,张克俭,等.过电流对线缆绝缘破坏的影响[J].消防科学与技术,2012,31(5):450-453.
[8]GB/T16840.5-2012电气火灾痕迹物证技术鉴定方法第5部分:电气火灾物证识别和提取方法[S].