Radial Identification of the Temperature Rise Rate of GIS Busbar Conductors Based on Temperature Gradients

Abnormal temperature rise is a slowly developing transient process, and the existing methods for Gas-insulated switchgear (GIS) internal temperature perception are based on fitting or training steady-state values. These methods are trained for specific GIS equipment, which usually leads to weak generality. Moreover, they are unable to provide real-time monitoring and early warning of the rise in the internal temperature of the GIS. The article takes the transient temperature rise rate as the characteristic parameter to perceive the heating state inside the GIS. The transient temperature rise equilibrium model is proposed and the corresponding radial identification of the temperature rise rate (RITRR) of the GIS busbar conductor is derived and analyzed. The results of the temperature rise tests show that the temperature rise rates of the ambient environment, enclosure, and conductor prove the models' correctness; the equilibrium coefficient's monotony confirms the feasibility of the RITRR of the GIS busbar conductor. This article provides a technical means to monitor the internal temperature rise status of GIS busbars from the ambient temperature and to reduce and prevent the occurrence of abnormal temperature rise accidents.