Arc　fault　is　one　of　the　important　factors　causing　electric　fire,　and　the　prevention　of　arc　fault　is　an　effective　means　to　reduce　the　occurrence　of　electricfire.　High　frequency　arc　fault　signal　is　generated　when　arc　fault　occurs.　Collecting　and　analyzing　the　high　frequency　arcfault　signal　can　effectively　detect　whether　arc　fault　occurs.　In　this　paper,　according　to　the　characteristics　of　the　phase　difference　of　the　winding　output　at　different　positions　of　the　winding　coil　under　the　high-frequency　current　signal,　the　special-shaped　winding　coil　current　transformer(S-SWCCT)　is　made,　and　the　output　characteristics　of　Special-shaped　winding　coil　with　different　turns　under　different　frequency　are　analyzed　experimentally.　Finally,　according　to　GB14287　standard,　arcfault　experiment　is　carried　out　and　current　signal　is　collected　and　analyzed　The　experimental　results　show　that　the　sensor　can　effectively　collect　the　high　frequency　signal　of　arcfault　andfilter　the　lowfrequency　signal　in　the　line