The　active　power　fault　component　is　calculated　by　extracting　the　voltage　fault　component　and　current　fault　component　at　the　protection　installation.　According　to　the　difference　of　the　high　and　low　frequency　energy　of　the　signals　on　both　sides　of　the　boundary　element　of　the　hybrid　bipolar　high　voltage　direct　current　transmission　line,　and　considering　the　influence　of　different　transition　resistance　on　the　result,　a　protection　scheme　based　on　the　transient　energy　ratio　of　the　active　power　fault　component　is　constructed　and　specific　protection　criteria　are　given.　In　the　protection　scheme,　the　difference　value　of　energy　ratio　between　positive　and　negative　poles　is　used　to　distinguish　single　and　bipolar　faults;　the　amplitude　of　energy　sum　of　positive　and　negative　bands　is　used　to　distinguish　positive　and　negative　faults　and　the　amplitude　of　energy　ratio　is　used　to　identify　internal　and　external　faults.　The　±500kV　hybrid　bipolar　HVDC　transmission　system　is　built　by　PSCAD/EMTDC　electromagnetic　simulation　software.　The　active　power　fault　component　is　decomposed　by　wavelet　packet　transform,　and　the　transient　energy　of　each　node　is　obtained,　which　is　verified　by　the　protection　criterion.　The　verification　results　show　that　the　protection　scheme　has　high　resistance　to　transition　resistance　and　the　data　time　window　is　only　3ms.　Under　the　different　working　conditions,　it　can　quickly　and　accurately　identify　internal　and　external　faults　and　perform　fault　pole　selection.　©　2019　IEEE.