引用本文: | 刘家军,杜智亮,李娟绒,等.铁路10 kV电力电缆头发热分析与安全监测[J].电力系统保护与控制,2019,47(24):131-138.[点击复制] |
LIU Jiajun,DU Zhiliang,LI Juanrong,et al.Thermal analysis and safety monitoring of railway 10 kV power cable joints[J].Power System Protection and Control,2019,47(24):131-138[点击复制] |
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摘要: |
针对铁路10 kV电力电缆头烧损事故频发的情况,对电力电缆头进行了发热分析与安全监测研究。基于铁路电力电缆的检修作业现状,利用有限元分析法建立了电缆头温度场仿真模型,通过对实际工况下电缆头温度场分布进行分析,发现金属护层中牵引地回流过大时对主绝缘散热影响较大,当接触电阻异常时电缆头处会形成温升异常点。在此基础上,采用最小二乘法对温度场仿真数据进行处理,得出了电缆最大载流值与外护套温度阈值整定公式,为电缆负荷调整与安全监测提供理论依据。最后,研发了基于电缆外护套温度、接地线电流、主绝缘介质损耗正切值等参数测量的在线监测装置,实现对电缆头运行的实时监测和异常报警与事故隐患预警功能,并为电缆头检修提供决策依据。 |
关键词: 电力电缆头 稳态温度场 牵引地回流 安全监测 |
DOI:10.19783/j.cnki.pspc.190142 |
投稿时间:2019-01-30修订日期:2019-04-28 |
基金项目:陕西省重点研发计划项目资助(2018ZDXM-GY- 169);西安市科技计划项目资助(2017080CG/RC043(XALG 026));国网陕西电科院2019年科技技术服务项目资助(2019-4-044) |
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Thermal analysis and safety monitoring of railway 10 kV power cable joints |
LIU Jiajun,DU Zhiliang,LI Juanrong,DUAN Wei |
(Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China;Xi'an Railway Traffic Electric Control Engineering Research Center, Xi’an 710048, China;State Grid Shaanxi Electric Power Research Institute, Xi’an 710054, China) |
Abstract: |
In view of the frequent occurrence of 10 kV power cable joints burning accidents, the heating analysis and safety monitoring of the power cable joints are studied. Based on the current situation of railway power cable maintenance, a simulation model of the cable joints temperature field is established by finite element analysis method. By analyzing the distribution of cable joints temperature field under actual working conditions, it is found that excessive traction ground backflow in the metal sheath has great influences on the heat dissipation of main insulation, and abnormal temperature rise points will be formed at the cable joints when the contact resistance is abnormal. On this basis, the least square method is used to process the temperature field simulation data, and the formula for setting the maximum current carrying value of the cable and the temperature threshold value of the outer sheath is obtained, which provides a theoretical basis for cable load adjustment and safety monitoring. Finally, an on-line monitoring device based on the measurement of state quantities such as cable sheath temperature, grounding wire current and main insulation dielectric loss tangent value is researched and developed to realize real-time monitoring, abnormal alarm and accident hidden danger warning, and to provide decision-making basis for the maintenance of the cable joints. This work is supported by Key Research and Development Program of Shaanxi Province (No. 2018ZDXM-GY-169), Xi’an Science and Technology Project (No. 2017080CG/RC043(XALG026), and 2019 Science and Technology Technical Service Project of State Grid Shaanxi Electric Power Research Institute (No. 2019-4-044). |
Key words: power cable joints steady-state temperature field traction backflow safety monitoring |