Abstract:

Universal digitalinput merging unit is an important device in smart substation. By receiving and merging digital message from electronic transformer, digital merging unit transfers sampling data to substation. At present, the interoperability between different electronic transformers and digital merging units is low , which affects the reliability of output data.The requirements of digital sampling in smart substation cannot be satisfied. Multiprotocol compatibility, outlier data detection and link state analysis are explored for digital merging unit and  the functions are implemented on a physical device. Basing on the experimental results, it shows that the exploration can increase intelligent level for substation by improving its compatibility for digital sampling system and reliability for digital sampling.

Key words:

smart substation, merging unit of digital input, outlier data detection, multiprotocol compatibility