【摘要】 针对管状熔断器温升特性的多介质传热问题，基于热-电类比，构建了包含熔丝焦耳热源、空气层/玻璃层导热及自然对流的LTspice模型，仿真计算了熔断器熔丝表面、玻璃管内外表面的升温情况。结果表明，空气层热阻(1 092.41 K/W)占总热阻的90.08%,导致其界面温差达785.29 K,而低热阻玻璃层(0.24 K/W)仅产生0.17 K温降。利用红外热像仪同步监测系统，测得熔断器表面热平衡温度389 K。熔断器表面温升曲线与仿真结果趋势一致。建立的LTspice热阻网络模型计算高效用于辅助教学，有助于学生理解傅里叶导热定律、牛顿冷却定律及动态热过程分析方法。更多还原

【Abstract】 To address the multi-medium heat transfer issue related to the temperature rise characteristics of tubular fuses, a thermal-electrical analogy-based LTspice model was constructed.This model incorporates the Joule heating source of the fuse element, heat conduction through the air/glass layers, and natural convection.It was used to simulate the temperature rise on the surface of the fuse element and the inner and outer surfaces of the glass tube.The results show that the thermal resistance of the air layer(1 092.41 K/W) accounts for 90.08% of the total thermal resistance, resulting in an interfacial temperature difference of 785.29 K,while the low thermal resistance of the glass layer(0.24 K/W) only causes a temperature drop of 0.17 K.Using a synchronized infrared thermal imaging monitoring system, the thermal equilibrium temperature of the fuse surface was measured to be 389 K.The temperature rise curve of the fuse surface aligns well with the simulation results.The developed LTspice thermal resistance network model is computationally efficient and can be effectively used in teaching, helping students understand Fourier’s law of heat conduction, Newton’s law of cooling, and the analysis methods of dynamic thermal processes.更多还原