On-line monitoring of GIS switch contact temperature based on infrared sensing

In view of the structure characteristics of the switch of GIS equipment, a method based on infrared sensing technology is proposed for on-line monitoring of the contact temperature of the GIS equipment. The influence of the surface emissivity of metal conductor on infrared temperature measurement has been studied and the influence of SF6 gas concentration and infrared filter on emissivity has also been analyzed. A method of indirectly obtaining the temperature at the contact area by directly measuring the shield temperature is proposed for the GIS contact with the shield structure. The relationship between the temperature of the GIS contact, the temperature of the shield and the ambient temperature is analyzed. The feasibility of the method is analyzed theoretically and experimentally.