中图分类号：TM247 文献标志码：A DOI: 10.16157/j.issn.0258-7998.267789 中文引用格式： 杨晨，张钢，张达，等. 基于暂态热路模型的直流无铠电缆实时温度估算方法研究[J]. 电子技术应用，2026，52(9)：113-118. 英文引用格式： Yang Chen，Zhang Gang，Zhang Da，et al. Research on real-time temperature estimation method of DC cable based on transient thermal circuit model[J]. Application of Electronic Technique，2026，52(9)：113-118.
Research on real-time temperature estimation method of DC cable based on transient thermal circuit model
Yang Chen1，Zhang Gang2，Zhang Da1，Li Chenxu1，Chen Shicong1，Hu Zun’ao2
1.Power Supply Branch of Beijing Metro Operation Co.， Ltd.；2.School of Electrical Engineering， Beijing Jiaotong University
Abstract： The insulation aging of DC unarmored cables in urban rail traction power supply systems often leads to non-metallic short circuits, resulting in cable burnout and seriously affecting power supply safety. This article is based on cable current and real-time estimation of cable temperature, providing technical support for cable over temperature protection. Firstly, based on the principle of thermoelectric analogy, a transient thermal circuit model was constructed, which includes cable conductors, insulation layers, comprehensive waterproof layers, and outer sheaths. The equivalent thermal resistance of air convection heat dissipation was considered to achieve real-time calculation of cable temperature. Then an experimental platform was built to conduct temperature rise experiments under constant load, impact load, and actual typical load. The experimental results show that the error between the calculated temperature and the measured temperature values of the model under the three operating conditions is less than 2%, which can meet the practical application requirements.
Key words : DC cable；transient thermal circuit model；temperature estimation of cables under multiple operating conditions；real-time temperature
