An overview of power swing detection methods in distance relays and the factors involved

Nowadays, due to the simplicity of operation and proper coordination characteristics, distance relays are being extensively used in protection power transmission lines. Despite many advantages, relay is exposed a maloperation when swing phenomenon occurs. Power swings may occur major disturbances, such as switching lines, generator interruptions, connecting or disconnecting large part loads, causing outages healthy Detecting preventing has always been challenge. In addition, different parameters can have great impact on performance detection methods. this paper, these their effects examined along with various methods for detecting swings. Accordingly, comprehensive review covers all aspects its detection, including causes swings, methods, determining threshold values effecting compensated lines wind farms testing function relays. It hoped that study will be helpful researchers system find relevant references develop new function.