交流故障电弧作用下电缆碳化的实验与仿真研究  

Experimental and Numerical Investigation of Cable Carbonization Under AC Fault Arc

作　　者：唐昭晖 许志红 叶骁勇 TANG Zhaohui;XU Zhihong;YE Xiaoyong(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,Fujian Province,China;Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou 350108,Fujian Province,China)

机构地区：[1]福州大学电气工程与自动化学院,福建省福州市350108 [2]福建省新能源发电与电能变换重点实验室,福建省福州市350108

出　　处：《中国电机工程学报》2024年第23期9496-9506,I0033,共12页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52277136);福建省2018科技创新领军人才资助项目(00387024)。

摘　　要：电缆碳化路径是电气火灾的一类重要致因。电缆绝缘材料经故障电弧烧蚀后形成碳化路径,搭接在电缆之间或电缆与大地之间构成导电回路,极易导致短路和电气火灾,严重威胁电力系统的安全稳定运行。探究电缆碳化路径的机理是业界关注的重要问题。该文基于电弧故障测试分析平台的工况条件对故障电弧引起电缆绝缘材料碳化过程进行实验与仿真研究。通过热重试验,初步构建绝缘材料的热解动力学模型。通过神经网络将热解动力学参数衍伸到电弧的高升温速率条件,为建立电缆碳化路径仿真提供反应机理和参数的基础。在此基础上,提出一种电路-电弧-热解耦合模拟方法,建立交流故障电弧作用下电缆碳化路径的三维数值模型,计算电弧的热、流耦合作用下电缆的碳化发展过程,探讨热解动力学参数及热解产气流速对故障电弧及电缆碳化的影响。结果可为研究电缆电弧故障的机理奠定理论基础。Cable carbonization path is an important scenario of electrical fire.The cable insulation material forms a carbonization path after being ablated by fault arc.It may form a conductive circuit between cables or between cables and ground,which can easily lead to short circuit and electrical fire,and seriously threaten the safe and stable operation of power system.Researching the mechanism of cable carbonization path is an important issue concerned by the industry.Based on the working conditions of the experimental platform developed by the research group,this paper carries out simulation and experimental research on the carbonization process of cable insulation materials caused by fault arc.Through the thermogravimetric test,the kinetic model of thermal decomposition of cable insulating materials is established.And the neural network is used to extend the pyrolysis kinetics parameters to the high heating rate environment of the arc,which provides the basis of reaction mechanism and parameters for the simulation of cable carbonization path.On this basis,a circuit-arc-pyrolysis coupling simulation method is proposed for the first time,and a three-dimensional numerical model of cable carbonization path under AC fault arc is established.The development process of cable carbonization under the coupling action of arc heat and flow is calculated.In addition,the effects of pyrolysis kinetics parameters and pyrolysis gas velocity on fault arc and cable carbonization are discussed.The work of this paper lays a theoretical foundation for studying the mechanism of cable arc fault.

关 键 词：电缆 电弧等离子体 碳化 多物理场耦合 

分 类 号：TM246[一般工业技术—材料科学与工程]