The　electromagnetic　transient　models　are　developed　with　PSCAD/EMTDC　for　three　kinds　of　wind　turbine:　squirrel-cage　wind　turbine,　DFIG　wind　turbine　and　D-PMSG　wind　turbine.　The　validity　of　the　electromagnetic　transient　model　for　D-PMSG　wind　turbine　is　verified　by　comparing　its　simulative　results　with　the　results　of　digital-analog　hybrid　experiments　under　different　fault　conditions　and　control　strategies.　The　validity　of　the　electromagnetic　transient　model　for　DFIG　wind　turbine　is　verified　by　comparing　its　simulative　results　with　the　results　of　short-circuits　experiment　for　real　wind　farm.　Based　on　these　models,　the　electromagnetic　transient　characteristics　of　wind　turbines　under　different　fault　conditions　are　analyzed,　which　show　that,　the　type,　working　status　and　adopted　control　strategy　of　fan,　the　fault　type　and　the　characteristics　of　weak　power　source　are　the　main　factors　affecting　on　the　fault　current　of　grid-connected　wind　farm.　The　research　lays　the　foundation　for　improving　existing　protection　relay　and　developing　new　protection　principles.