Detection method for opening and closing coil of direct-current circuit breaker

The invention relates to the field of direct-current circuit breaker fault detection, and discloses a direct-current circuit breaker opening and closing coil detection method, which comprises the following steps of: setting a coil displacement sensing module and a coil data acquisition module; acquiring displacement data according to a coil displacement sensing module; voltage data of the opening and closing coil during opening and closing operation is acquired according to a coil data acquisition module; drawing a voltage change curve for the voltage data according to the coil position sensing module, and generating an electric quantity bounce curve according to the voltage change curve; drawing a displacement change curve for the position data according to the coil position sensing module, and generating a mechanical bounce curve according to the displacement change curve; and determining the degradation trend and the residual life of the coil according to the electric quantity bounce curve, the mechanical