Simulation Analysis of Plum Blossom Contact Temperature Field Based on Finite Element Analysis

As an indispensable part of the switch cabinet, the plum blossom contact will affect the safe and stable operation of the equipment. The long-term high temperature operation of the plum blossom contact will greatly affect the service life of the equipment. In this paper, the temperature rising of 630A/12-piece and 630A/24-piece quincunx contacts are calculated by combining actual measurement and finite element analysis, and the performance of two different types of quincunx contacts is analyzed and compared. The simulation results show that the maximum temperature rise of the plum blossom contacts of 12 contact fingers is 51.5°C, and the maximum temperature of the plum blossom contacts of 24 contact fingers is 64.4 °C. In the actual test, the maximum temperature rise of the plum blossom contacts with 12 contact fingers is 56.9 °C, and the maximum temperature of the plum blossom contacts with 24 contact fingers is 62.4 °C. Different from the experience that the fewer the contact fingers, the lower the temperature rise, the plum blossom contact with more contact fingers produces a higher temperature rise. From another point of view, this result may be due to the fact that under the same radius, the plum blossom contact with more contact fingers receives less spring pressure, and the increase in contact resistance leads to a more obvious thermal effect. This also shows that the influence of contact resistance on temperature should also be considered when the contact fingers are increased.