This　paper　presents　an　integrated　relay　and　its　associated　protection　scheme　for　power　line　systems.　The　concept　of　integrated　protection　is　firstly　introduced,　in　which　a　centralized　protection　system　or　relay　provides　the　protection　for　multiple　power　plants　or　a　substation.　A　novel　integrated　protection　relay　based　on　a　combination　of　a　number　of　protection　principles　is　described.　In　the　proposed　scheme,　the　specially　designed　protection　relays　are　installed　at　each　substation　of　a　network　and　are　responsible　for　the　protection　of　every　line　section　connected　to　the　substation　busbar.　The　combined　algorithms　with　multiple　settings　are　implemented　into　the　relay　to　cover　all　the　protected　line　sections.　Simulation　studies　show　that　the　proposed　protection　scheme　is　able　to　produce　desirable　performance　and　may　offer　many　advantages　over　the　existing　one　and　great　potential　for　future　applications.　©　2008　IEEE.