过载、破损及老化风险场景的单芯PVC电缆温升研究*

为研究多风险耦合场景下单芯PVC电缆温升问题，基于传热学理论建立电缆温升方程及热平衡函数，设计过载、破损和老化风险场景的PVC电缆温升试验，测量并分析电缆温升趋势，提出电缆温升数据的稳健拟合方法，并拟合过载、破损-过载、老化-过载及破损-老化-过载组合风险耦合场景下的电缆平衡温升方程。研究结果表明:过载是电缆温升的主要风险因素，破损和老化风险可通过改变传热条件进一步影响电缆温升，量化了耦合风险下单芯PVC电缆的温升规律。研究结果可为电缆内因火灾预警和防控提供参考。

Study on temperature rise of single core PVC cable in risk scenarios of overload,damage and aging

In order to study the temperature rise problem of single core PVC cable in multiple risk coupling scenarios,the equation of cable temperature rise and the heat balance function were established based on the heat transfer theory,and the temperature rise tests of PVC cable in the risk scenarios of overload,damage and aging were designed to measure and analyze the trend of cable temperature rise.A robust fitting method of cable temperature rise data was proposed,and the equations of cable equilibrium temperature rise in the combined risk coupling scenarios of overload,damage-overload,aging-overload and damage-aging-overload were fitted.The experiment revealed that overload is the main risk factor of cable temperature rise,damage and aging risk can further affect the cable temperature rise by changing the heat transfer conditions,and quantified the temperature rise law of single core PVC cable under coupling risk.The research results can provide reference for the early warning and prevention of cable internal fire.