雷电流冲击下导电混凝土模块的热分布特性研究

Thermal Distribution Characteristics of Conductive Concrete Module Under Lightning Current Impulse

导电混凝土在电力系统接地中具有较好的应用前景,雷电流冲击下的热特性分布对导电混凝土接地模块的设计及应用具有重要影响。基于热电耦合原理分析了雷电流冲击下导电混凝土模块的热量产生过程,研究了导电混凝土模块内部的热量传导规律,利用多物理场耦合分析软件建立了导电混凝土雷电冲击模型,对雷电流冲击下导电混凝土模块的热分布特性进行了仿真分析,并与普通土壤和普通混凝土模块进行了对比分析。仿真结果表明导电混凝土在受到雷电流冲击时,其内部的温度更低、温度梯度更小,具有较好的热学性能,较适宜用于电力系统的接地中。

Conductive concrete has a good application prospect in power system grounding. The distribution of thermal characteristics under lightning current impulse has an important influence on the design and application of conductive concrete grounding module. Based on the principle of thermoelectric coupling, the heat generation process of the conductive concrete module under the impact of lightning current was analyzed, and the heat conduction law inside the conductive concrete module was studied. The multi-physics coupling analysis software was used to establish the lightning impact model of the conductive concrete to conduct electricity under the lightning current.The thermal distribution characteristics of the conductive concrete module were simulated and analyzed, and compared with the common soil and ordinary concrete modules. The simulation results show that when the conductive concrete is impacted by lightning current, its internal temperature is lower and the temperature gradient is smaller, it has better thermal performance and is more suitable for the grounding of power system.