Inverse Problem Identification of Thermal Defects of Fault Components in Electric Control Cabinet Based on Infrared Temperature Measurement
基于红外测温的电气控制柜内部元件热缺陷严重程度的反问题识别

The method and standard for judging overheated components in an electric control cabinet are established according to the related GB in China. The thermal radiation emitted from the overheated components to the inner surface in an electric control cabinet is analyzed according to the infrared radiation theory. The heat flux distribution of the inner surface in the cabinet is obtained and a two-dimensional heat transfer model for the heated cabinet casing is built. On the basis of the infrared imaging temperature measurement data obtained, a L-M algorithm is used to study the inverse heat conduction problem and the heating temperature of the overheated component with different thermal defects in an electric control cabinet is solved accurately. Finally, the severity of the thermal defects of the component in the electric control cabinet is identified by using a surface temperature judgment method. The result shows that the method is useful for the fault diagnosis of the overheated components in electric control cabinets.