The　thermal　faults　of　GIS　(Gas　Insulated　Switchgear)　disconnect　switch　can　lead　to　serious　electrical　accidents,　and　the　temperature　of　the　contacts　is　an　important　indicator　for　effectively　detecting　thermal　faults.　Therefore,　conducting　temperature　field　calculations　for　GIS　is　of　great　significance.　In　this　paper,　a　multi-physics　simulation　calculation　model　is　established　for　a　110 kV　GIS　disconnect　switch.　Firstly,　electromagnetic　simulation　calculations　are　carried　out　to　obtain　the　distribution　of　losses.　Then,　the　calculated　losses　are　coupled　as　heat　sources　to　the　temperature　fluid　field　to　obtain　the　temperature　and　flow　field　distribution.　Based　on　this,　temperature　field　analysis　is　further　carried　out　for　different　contact　resistance　values　in　abnormal　contact　conditions.　The　results　show　that　the　temperature　hotspots　of　the　GIS　disconnect　switch　are　concentrated　on　the　upper　contacts　of　the　disconnect　switch.　In　the　case　of　poor　contact,　the　highest　temperature　point　is　42.06%　higher　than　that　under　normal　working　conditions.　©　Beijing　Paike　Culture　Commu.　Co.,　Ltd　2024.