Study on Temperature Rise Characteristics of GIS Disconnector Under Different Operating Conditions

The degradation of the electrical contact in a gas insulated switchgear (GIS) is closely related to overheating at the contact. However, the disconnector contact is one of the hot contacts in GIS. Therefore, in this paper, the finite element method was used to solve the three-dimensional multiphysics coupling temperature rise field and flow field in the Single Phase in One Tank (SPIOT) type GIS disconnector under different operating conditions. From the perspective of temperature rise field and flow field, this paper analyzed the temperature rise characteristics under different working conditions and explored the feasibility of the direct application of air, CO
₂
and C
₄
F
₇
N/CO
₂
mixed gas to an electrical device. The disconnector temperature rise experiment platform was then built to verify the simulation. The results showed that the temperature rise field and the flow field distribution were similar in four gas environments. SF
₆
gas had the smallest temperature rise, followed by C
₄
F
₇
N/CO
₂
mixed gas, and the temperature rise of CO
₂
and air was relatively large. Therefore, from the perspective of the temperature rise field and flow field, it was feasible to directly apply C
₄
F
₇
N/CO
₂
mixed gas to an electrical device in order to meet insulation requirements.