Abstract :
This paper presents a broad overview of system considerations affecting protective relaying applications on extra-high voltage (EHV) systems. Discussions include the effects of line parameters on relaying, transient response of current transformers and coupling capacitor voltage transformers, control circuit and relay surge protection, sub-synchronous resonance problems, stability considerations, influence of harmonics and power line noise on carrier relaying, automatic reclosing considerations and simulation of transmission line transients for relay applications.
