The　large-scale　wind　power　integration　into　power　system　shows　more　and　more　unique　fault　features.　There　exists　an　adaptability　problem　when　traditional　relays　are　used　with　wind　power.　Distance　protection　is　widely　used　for　transmission　line　protection　and　its　adaptability　to　the　wind　power　has　great　significance.　To　assess　the　adaptability,　the　best　working　condition　is　firstly　obtained　by　deducing　the　basic　theory　of　the　distance　protection.　And　then,　based　on　the　condition　and　the　fault　characteristics　of　wind　power　system,　the　protection　adaptation　is　analyzed　using　theoretical　analysis.　The　research　shows　that　the　power　frequency　variation　of　impedance　protection　is　not　suitable　for　wind　power　integration　due　to　poor　feedback　and　instability　of　wind　power　system　impedance.　The　power　frequency　distance　protection　has　phasor　extraction　problem　because　of　high　harmonics　and　frequency　deviation　in　the　wind　power　system.　In　the　meantime,　the　time　domain　distance　protection　still　remains　good　performance.　The　above　points　are　verified　by　simulation　results.　©　2015　Automation　of　Electric　Power　Press.