System-Wide Protective Relay Setting and Coordination in Large-Scale Transmission systems-A Review

Abstract

This paper presents an extensive bibliography resulting from a detailed literature survey on the topic of System-wide protective relay setting and coordination in large scale transmission systems. Coordinating a system of directional relays is also very complicated due to the typical loop structure of the transmission system and also changing the setting parameters of one relay for obtaining coordination for all the relevant fault current pairs can disturb the proper coordination of the already checked relay pairs. Arbitrary starting relay locations and arbitrary consideration of relay sequence to set and coordinate relays will result in navigating loops many times, and usually result in futile attempts to achieve system-wide relay coordination. This paper lists out the various methods for determining the break point set to provide accurate directional relay coordination.