Medium Voltage Direct Current (MVDC) is a new concept gaining its popularity due to increase of the transfer capacity and improved power quality of the distribution networks.The aim of this thesis is to investigate different short circuit faults in MVDC systems and proposing a protection strategy for each fault, furthermore, it is also to be analyze what happens when the fault occur on one side of the system. Whether it affect the whole system or that point.Using the MATLAB simulation, this study analyzed the symmetrical and unsymmetrical faults in MVDC and proposing the protection strategy...