The　insulation　method　of　traditional　electromagnetic　current　transformers　(CTs)　is　single-stage　insulated,　and　the　insulation　materials　include　oil,　SF6　gas,　polytetrafluoroethylene　(PTFE)　film,　and　epoxy　resin.　It　has　to　deploy　multiple　capacitive　screens　for　voltage　equalization　to　improve　the　electric　field　distribution,　which　results　in　complex　insulation　structure　and　high　cost.　A　multistage　dry　insulated　CT　for　measurement　is　proposed　in　this　article,　which　is　composed　of　multistage　CTs　in　series　and　insulated　by　epoxy　resin,　so　the　line　voltage　is　shared　by　the　multistage　CTs.　Therefore,　a　five-stage　prototype　CT　is　analyzed　and　designed,　and　the　structure,　the　measurement　principle,　the　electric　field　distribution,　the　technical　characteristics,　and　the　error　calculation　and　compensation　of　this　CT　are　explored.　The　results　show　that　the　proposed　dry　CT　meets　the　0.2S　class　accuracy　and　has　advantages　of　low　insulation　cost,　high　safety,　environmental　protection,　and　so　on.　©　2001-2012　IEEE.