Fault　isolation　is　an　important　technology　to　help　guarantee　that　a　DC　system　can　be　operated　stably.　A　new　fault　isolation　strategy　is　proposed　to　improve　the　traditional　strategy　which　relies　too　much　on　a　high-performance　DC　circuit　breaker　(DCCB).　The　new　strategy　makes　use　of　the　coordination　between　a　flexible　current　limiting　device　(FCLD)　and　a　DCCB.　First,　the　cooperative　mechanism　between　the　FCLD　and　DCCB　under　permanent　fault　and　transient　fault　is　researched.　Second,　the　arc　transient　characteristic　of　the　interruption　of　the　DCCB　considering　suppressed　current　from　the　FCLD　is　analyzed.　Finally,　a　simulation　is　carried　out　on　the　Matlab/Simulink　platform　to　verify　the　feasibility　of　the　new　cooperative　strategy.　The　results　show　that　FCLD　can　inhibit　the　breaking　arc　effectively;　with　this　new　fault　isolation　strategy,　the　DC　system　can　finish　ride　through　smoothly　in　the　transient　fault,　while　the　DCCB　can　complete　the　no　arc　break　in　the　permanent　fault.　The　new　strategy　has　reduced　the　breaking　requirements　for　DCCB　in　terms　of　the　DC　system’s　fault　isolation,　and　improved　the　fault　ride-through　capability　of　the　DC　system.　©　2024　Power　System　Protection　and　Control　Press.　All　rights　reserved.