A　fault　current　limiting　technology　based　on　early　short　circuit　detection　is　proposed　to　improve　the　performance　of　FCL　(Fault　Current　Limiter)　for　mid-voltage　system.　A　fault　simulation　model　of　mid-voltage　power　distribution　system　is　built　and　the　Mallat　multi-scale　wavelet　transform　is　applied　to　realize　the　early　short　circuit　detection.　Its　effectiveness　is　verified　by　taking　the　mid-voltage　dynamic　simulation　system　as　the　object.　With　the　series　resonant　FCL　as　an　example,　the　short　circuit　current　limiting　effect　is　compared　between　the　conventional　and　the　proposed　short　circuit　detection　methods.　With　the　breaking　severity　of　circuit　breaker　as　an　indicator,　the　influence　of　early　short　circuit　detection　on　the　breaking　capability　is　analyzed　and　the　simulative　results　show　its　better　breaking　performance.　©,　2014,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.