继电保护设备元器件温度仿真分析与寿命评估

针对继电保护设备热设计阶段定量分析手段不足的问题，开展设备高热损元器件温度仿真分析及寿命评估。首先分析了继电保护设备的结构特征及散热机理，提出了继电保护设备机箱及板卡热仿真精细化建模方法，并基于Icepak软件建立了典型继电保护设备有限元仿真模型。然后通过改变继电保护设备有限元模型的仿真参数，仿真计算了不同环境温度、不同散热措施下各板卡高热损元器件工作温度，定量分析了高热损元器件温度变化情况。在此基础上，提出了基于继电保护设备温度分布特性及阿伦尼乌斯方程的高热损元器件寿命评估方法，揭示了设备运行环境温度对元器件寿命及可靠性的影响规律。得到的元器件温度特性及寿命分析结果，可为继电保护设备开展热设计及优化提供数据与理论依据。

Temperature simulation analysis and life evaluation for components of relay protection equipment

There is a lack of quantitative analysis methods in the thermal design stage of relay protection equipment. Thus temperature simulation analysis and life assessment of high heat loss components of the equipment are carried out. First, the structural characteristics and heat dissipation mechanism of relay protection equipment are analyzed, a refined modeling method for thermal simulation of chassis and board is proposed, and a finite element simulation model of typical relay protection equipment is established based on Icepak. Then by changing the parameters of the finite element model of the relay protection equipment, the operating temperature of the high heat loss components under different ambient temperatures and different heat dissipation measures is calculated, and the temperature change of the high heat loss components is quantitatively analyzed. From this a life assessment method of high heat loss components based on the temperature distribution characteristics of relay protection equipment and the Arrhenius equation is proposed. The influence of equipment operating environment temperature on the life and reliability of components is revealed. The temperature characteristics and life analysis results of components can provide data and a theoretical basis for thermal design and optimization of relay protection equipment.