Discrimination Between Power Swing and Line Fault Based on Voltage and Reactive Power Sensitivity

Abstract

One of the major concerns responsible for widespread blackout is power swing which occurs due to rapid swift in system configuration or load patterns in transmission network. It may aggravate undesirable tripping of protective elements. Proper discrimination between power swing and fault is the complicated task for protection engineers. This chapter projects an innovative discrimination method based on voltage and reactive power sensitivity at relay location. Power swing condition is analyzed by series of disturbances such as variation in mechanical power input to synchronous generator, outage of parallel line due to fault and sudden appliance / removal of heavy load. It is publicized that the proposed scheme responds successfully and issues trip signal during fault and leftovers out of action during power swing condition. The developed scheme has been also validated for symmetrical fault incepted during power swing, and it outperforms with promising accuracy.