Multi-Physics Field Simulation Analysis of GIS Disconnect Switch Contact Temperature Considering Contact Anomalies

The thermal faults of GIS (Gas Insulated Switchgear) disconnect switch can lead to serious electrical accidents, and the temperature of the contacts is an important indicator for effectively detecting thermal faults. Therefore, conducting temperature field calculations for GIS is of great significance. In this paper, a multi-physics simulation calculation model is established for a 110 kV GIS disconnect switch. Firstly, electromagnetic simulation calculations are carried out to obtain the distribution of losses. Then, the calculated losses are coupled as heat sources to the temperature fluid field to obtain the temperature and flow field distribution. Based on this, temperature field analysis is further carried out for different contact resistance values in abnormal contact conditions. The results show that the temperature hotspots of the GIS disconnect switch are concentrated on the upper contacts of the disconnect switch. In the case of poor contact, the highest temperature point is 42.06% higher than that under normal working conditions.