Power System Selectivity: The Basics Of Protective Coordination
The intent of this article is to provide a brief primer about the essence of coordinating the basic protective components of the electrical power system, including circuit breakers, fuses and protective relays, and to enable the reader to review a plot of time current curves and evaluate several key concerns:
How well do the devices work with each other?
Will a minimal amount of the power system be lost by a fault?
How well are the power system components protected?
Could the chosen ratings and settings cause nuisance trips?