To make a deep investigation into the temperature distribution characteristics of the electrical joint overheat defect, a 3-D simulation model based on the mechanical-electromagnetic-thermal coupling field is established. The four-hole plane joint is selected as an example, the influence of the contact pressure on the interface electrical conductivity is considered, and the convective heat transfer between the joint and the air outside is included. Based on this model, the current distribution characteristics and the main area of temperature rise of the joint are explored. The results can provide simulation support for the modeling of equipment level digital twin of the electrical joint.

Overheat Defect;Mechanical-Electromagnetic-Thermal Coupling Field;Electrical Joint;Simulation Analysis