The saturation mechanism of converter transformer caused by commutation failures of converters is analyzed first. Aiming at the characteristics of differential current and fault current of converter transformer during commutation failures under fault recovery, the performance of converter transformer differential protection when it is simultaneously affected by both commutation failures and fault differential current during the fault recovery is studied. It is revealed that, during the fault recovery, the commutation failure has a facilitating effect on the recovery inrush. Under this situation, when minor internal faults occur, the differential protection has the risk of delayed operation, and its rapidity is unable to be guaranteed. Finally, a protection scheme based on discrete Fréchet distance is proposed and its performance is evaluated by simulation tests. The results indicate that when commutation failures and faults simultaneously occur during fault recovery, the proposed scheme can effectively block the protection under an external fault, and rapidly identify an internal fault so as to trip the differential protection correctly. This work is supported by the National Natural Science Foundation of China “Analysis of Major Risk Caused by the Reclosure of Large-scale Power Transmmision Channel and Study on Avoidance Control Strategy (No. 52077120).