Fast current protection method with channel applicable to distribution networks containing DGs

The invention relates to a fast current protection method with a channel applicable to distribution networks containing DGs, which adopts directional current protection, only actuates the protection when the forward fault occurs, and can set the realization of the switching of the functions of the conventional directional current protection with three stages and the fast current protection with the channel by setting control words. When no channel is selected, a working mode is the conventional directional current protection with three stages, namely stage I is instantaneous current fast tripping protection, and stage II and stage III are constant time lag fast tripping protection; and when the channel is selected, the working mode is the fast current protection with the channel, namely stage I and stage II are used for starting fast current protection, and stage II and stage III are still the constant time lag fast tripping protection. The method supports the function of commanding direct tripping, and can receive remote tripping signals sent by other protection devices to realize direct tripping. The method configures a flexible three-phase one-shot auto-reclosing function which is used for removing transient fault, and can realize direct fast re-closing, non-voltage re-closing of check lines or synchronism check re-closing. The protection has flexible configuration, and can well adapt to the distribution networks containing the DGs.