Inversion Method for Contact Temperature of GIS Disconnect Switch

With the continuous development of China’s power industry in recent years, the construction of China’s power grid has developed rapidly in the context of modern society. In the process of building modern transformer substation in China, Gas Insulated Switchgear (GIS) has been widely used. The faults caused by poor contact in GIS account for 29% of all faults, making it the highest occurrence rate among all faults. Poor contact leads to abnormal temperature rise of the contacts, so it is necessary to conduct research of temperature rise. This article takes the 110kV three-phase co-box type GIS disconnect switch as the research object, establishes a simplified model, conducts simulation calculation of multi-field coupling, and achieves the goal of inverting the contact temperature with the temperature of monitoring points on the shell. In order to achieve this goal, this article further conduct temperature research. Selecting monitoring points on the surface of the shell and optimizing the selection of monitoring points using genetic algorithm, then analyzing the relationship between the temperature of the monitoring points and the contact temperature, a contact temperature inversion model based on the temperature of the monitoring points is established. The results show that the inversion model of contact temperature of GIS disconnect switch has high accuracy, with an error of less than 3%, and can be used for non-invasive monitoring of contact temperature.