The digital transformation of substations is an inevitable trend in the construction of new power systems. The construction scheme of the substation digital system is described from the macro perspective. First, the existing online monitoring data and the data collected by the newly added sensors in the station are collected to establish a data resource pool at the basic layer. At the transmission layer, a unified data transmission network integrating broadband, narrowband and positioning information is built. At the same time, all data are governed in a regular manner to build the relationship between equipment and telesignaling, telemetry, telepulse and alarm information for the upper-layer application retrieval. At the application layer, for the operation and maintenance and overhaul business in the station, an intelligent operation and maintenance and lean overhauling platform is established to promote the manual substitution of daily operation and maintenance business. In addition, an intelligent diagnosis platform is built for the key equipment in the station to achieve the diagnosis and fault analysis of equipment status, and further realize the management of the entire life cycle of the equipment. Finally, at the examine and control layer, the channels for upward information collection and downward on-site management and control is unblocked to improve the examine and control ability of the operation site. Eventually, a practical and effective substation digital system is built, which provides a useful reference for the digital transformation construction of substations in the future.
