Modeling method of metallized film capacitor based on electrothermal coupling analysis

The aging and failure of metallized film capacitors due to heat is very common, which will affect the operating efficiency and safety performance of power system, so it is necessary to conduct thermal simulation analysis of film capacitors. By analysing the coupling characteristics of electrothermal field of metallized film capacitors, the electric field and thermal field characteristics of capacitors are established, which provides theoretical basis for physical modeling and finite element analysis of capacitors. The thermal parameters of the capacitor element are fitted and the heating load is applied. The heating law and temperature distribution of the metallized film capacitor are summarized by comparing the simulation temperature results with the test results. The results show that the simulation results are very close to the actual heat condition of the metallized film capacitor, which verifies the accuracy of the modeling method.