Summary paper for C37.243 IEEE Guide for Application of Digital Line Current Differential Relays Using Digital Communication

This paper is a summary of the C37.243 IEEE Guide for Application of Digital Line Current Differential Relays Using Digital Communication which has recently been developed in accordance with the following scope: This guide presents practical line current differential schemes using digital communications. Operating principles, synchronization methods, channel requirements, current transformer (CT) requirements, external time reference requirements, backup considerations, testing considerations, and troubleshooting are included. It also provides specific guidelines for various application aspects including multi-terminal lines, series compensated lines, mutually coupled lines, line charging current, in-zone transformers and reactors, single-phase tripping and reclosing, as well as communications channel requirements.