DC grid is an effective means to deal with the problems of long-distance and large-capacity transmission, new energy integration and absorption. However, its low damping characteristics and fast fault development make it difficult to isolate faults. It is of great significance to study and improve the fault clearance capability of DC power grid. In this paper, in order to improve the fault clearance capability, a configuration strategy of direct current circuit breakers(DCB) concerning types of converters is proposed. Then, the action sequences and reclosing strategy of DCB in this configuration method under different fault conditions are introduced. The criterion of transmission line protection and the measures to coordinate with converter station are also introduced meanwhile. Finally, a three-terminal hybrid simulation model is built in PSCAD/EMTDC to simulate and analyzes the fault phenomena of the proposed configuration methods traditional configuration method, and the simulations results show that the proposed configuration can quickly isolate the faults in HVDC grid, reduce the blackout range and improve the reliability of power supply, which means the configuration can be used as feasible for practical system.