The　fist　peak　limit　method　of　short-circuit　current　of　110kV　variable　impedance　transformer　(VIT)　is　studied.　In　case　of　short-circuit,　the　fast　vacuum　circuit　breaker　(FVCB)　is　interrupted　in　the　short-circuit　current　rising　stage　through　artificial　zero-crossing　circuit,　so　that　the　short-circuit　current　flows　through　the　built-in　current-limiting　reactor　(in　series　with　the　high-voltage　winding)　and　therefore　be　limited.　The　relationship　between　the　first　peak　value　of　110kV　VIT　short-circuit　current　and　the　voltage　phase　angle　at　the　moment　of　short　circuit　is　simulated.　The　results　show　that　it　is　necessary　to　limit　the　short-circuit　current　only　when　the　phase　angle　is　in　the　intervals　of　[-180°,　-120°],　[-60°,　60°]　and　[120°,　180°],and　the　FVCB　opening　time　and　short-circuit　fault　identification　algorithm　time　meet　the　requirements　of　current　limiting　scheme.　After　the　FVCB　be　interrupted,　the　short-circuit　current　of　the　VIT　winding　will　continue　to　increase.　By　triggering　the　artificial　zero-crossing　branch　in　advance　and　reducing　the　capacitance　of　the　artificial　zero-crossing　circuit＇s　capacitor,　the　first　peak　value　of　the　short-circuit　current　of　the　VIT　can　be　limited　to　the　same　level　as　that　of　maintaining　the　FVCB　open　state.　The　current　limiting　scheme　can　be　verified　by　large　current　test　loop,　which　is　more　stringent　in　testing　the　breaking　capacity　of　FVCB　than　the　actual　transformer　outlet　short-circuit.　©　2021,　Electrical　Technology　Press　Co.　Ltd.　All　right　reserved.