Overview of Key Parameter Calculation Methods for Thermal Simulation of Relay Protection Equipment

New power system has higher requirements for the reliability of relay protection equipment, thermal simulation analysis can effectively improve the thermal reliability of relay protection equipment, and the accuracy of simulation parameters directly affects the results of thermal simulation analysis. This article investigated the structural characteristics and commonly used component types of relay protection equipment, analyzed their heat dissipation mechanism, and provided a calculation method for key parameters that affect the thermal simulation analysis of relay protection equipment. Based on the proposed method, a finite element model for CPU board thermal simulation of relay protection equipment was established, and temperature rise tests were conducted. The simulation and experimental results verify the effectiveness of the proposed method.