Self-checking method of direct-current circuit breaker

The invention discloses a self-checking method of a direct-current circuit breaker. The method comprises the following steps: determining an insulated gate type power device in a direct-current circuit breaker circuit; classifying the insulated gate type power devices according to the branch types to obtain a target set, and sorting the insulated gate type power devices in the target set to obtain a sorting result; and detecting whether a current exists in a target branch of the target branch type corresponding to the target set, and determining that the insulated gate type power device corresponding to the sequence has a fault under the condition that the current does not exist in the target branch. According to the method and the device, the problems that the judgment process of indirectly judging whether the device fails or not based on the driving control panel in the related technology is relatively tedious and excessively depends on the data processing capability of the driving control panel, and the pr