Research on designing methods of the secondary system in digital substation

A designing method for the secondary system in digital substations is proposed, which takes the graphics software of Power Designing Institutes as a platform. The model of primary system and ICD (IED Capability Description) files of secondary devices are used as initial design information. Designers configure secondary devices and connect virtual terminals on the model of primary systems. Then visual virtual secondary circuits, network physical wiring and functional interoperation are generated to describe the configuration and structure of secondary system in digital substations. At the same time, SCD (Substation Configuration Description) files and CID (Configured IED Description) files will be generated automatically. The proposed method provides visual means for secondary system design in digital substations, which is good for standardized and normalized integration work of secondary systems in substations as well as for installation, adjustment, extension, reconstruction and update of devices in digital substations.