Abstract
A two-level relay protection system has been developed that provides a significant improvement in the basic properties of relay protection. The proposed system consists of a base level and a centralized “digital add-on” for each power node. The developed two-level structure of the centralized digital RS system ensures the autonomy of the base level and the survivability of the entire relay protection system at the substation as a whole. This “digital substation” management architecture can be implemented on-site in stages. The two-stage principle of organizing construction and installation and commissioning works allows creating new “digital” substations and converting existing substations to the status of “digital” substations with minimal time spent. Comprehensive studies of the prototype of the protection system conducted in the laboratory and in the conditions of pilot operation confirmed the validity of the restrictions and assumptions adopted during the development.
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