Influence of Contact Resistance Deterioration of Contact Finger on Electrical Thermal Coupling Field Distribution in GIS

In recent years, too many GIS discharge accidents caused by contact overheating of current carrying connection structure have occurred in China, which seriously threatens the safety of power grid. It is necessary to study the influence of contact resistance deterioration of contact finger on the distribution law of electrical thermal coupling field of GIS basin insulator. In this paper, the contact finger connection structure used in GIS current carrying system is considered, and the three-dimensional thermal flow field distribution of GIS is simulated by using the three-dimensional electromagnetic thermal flow coupling field simulation calculation method. The influence of the deterioration degree of contact resistance of contact finger on the thermal field distribution of GIS is analyzed. The distribution law of electrical thermal coupling field of GIS equipment caused by the change of contact resistance and current carrying capacity of central guide rod plug-in structure is studied, which is of great significance to practical engineering.