A solution for intelligent reconstruction of 110kV Pingyin substation

110kV Pingyin substation of Shandong Electric Power Corporation has reconstructed recently under the requirements of typical intelligent substation. Different from implementing new intelligent substations, intelligent reconstruction of conventional substation faces much more technical and economic issues. The project adopts three-layer network architecture, including process level, bay level and station level. To share the information of SV (Sampled Values) and GOOSE (Generic Object Oriented Substation Event), the project combines peer-to-peer mode and network mode at process level. In this substation, conventional instrument transformers and traditional primary equipment are reserved entirely, but the reconstruction realizes digital processing of data collection by MU (Merging Unit) and controls circuit breaker by IT (Intelligent Terminal). The transformer intelligent terminal partially substitutes for intelligent primary equipment, which is responsible for monitoring and controlling the power transformer. To avoid an increase in the number of secondary equipment, a distributed configuration scheme is put forward using the IED (Intelligent Electronic Device) with integrated functions of process-level and bay-level. Finally the paper discusses the technical features and implementation scheme of the project, and sums up the design principle, equipment configuration and process-level communication during intelligent reconstruction of conventional substation.