The　buckling　of　transformer　windings　caused　by　radial　short-circuit　electromagnetic　force　is　one　of　the　significant　causes　of　transformer　failures,　threatening　the　safe　operation　of　the　entire　power　system.　Comparing　the　maximum　stress　in　the　windings　with　the　critical　buckling　stress　is　an　essential　criterion　for　analyzing　whether　the　buckling　will　occur.　Hence,　it　is　vitally　important　to　obtain　an　accurate　stress　distribution　in　windings　under　radial　electromagnetic　force.　Studies　have　shown　that　the　thin　paper　insulation　wrapped　around　the　conductors　can　affect　the　mechanical　strength　of　windings.　Therefore,　it　is　necessary　to　consider　the　influence　of　paper　insulation　on　stress　distribution　in　the　research.　In　this　paper,　the　copper-paper　layered　ring　winding　model,　which　can　be　analyzed　as　a　2D　stress　distribution　problem,　has　been　constructed.　The　governing　equation　for　this　model　in　polar　coordinate　has　been　acquired.　Because　of　the　assumed　close　contact,　the　displacement　and　radial　stress　must　match　at　the　copper-paper　interface.　By　solving　the　equations,　the　stress　distribution　can　be　obtained.　As　a　calculation　sample,　the　low-voltage　(LV)　winding　of　a　type　of　110　kV　transformer　has　been　studied.　There　are　two　Continuously　Transposed　Conductors　(CTCs)　that　wound　in　parallel　in　one　disk,　so　the　model　contains　two　layers　of　copper　and　one　layer　of　paper.　The　hoop　stress　distribution　and　the　radial　stress　distribution　have　been　calculated.　The　results　show　that　the　hoop　stress　varies　more　than　15%　from　the　innermost　radius　to　the　outermost　radius　and　the　radial　stress　is　small　in　comparison.　The　hoop　stress　in　the　paper　layer　is　much　smaller　than　that　in　the　copper　layer.　The　obtained　results　have　been　verified　using　the　finite-element　method.