The invention provides an intelligent delineation system and method and an intelligent substation, and relates to the technical field of intelligent substations. According to the invention, the new SCD file and the reconstruction and extension SCD file of the intelligent substation can be imported through the presentation layer; the persistent layer extracts device information and virtual loop connection information from the new SCD file and the reconstructed and expanded SCD file; then, the service layer determines an upgrading device and a swept device of the intelligent substation accordingto the device information and the virtual loop connection information; automatic delineation of the upgrading device and the swept device of the intelligent substation is achieved, the problem that the upgrading device and the swept device of the intelligent substation cannot be accurately determined through a traditional cable wiring inspection and swept judgment method is effectively solved, and meanwhile the detection time is shortened.