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Issue IV
Selectivity is an Important Part of System Protection
Selectivity is an Important Part of System Protection Electrical System Designers and Protection Engineers have always been faced with a variety of complex problems in their efforts to create reliable systems. Minimizing risks and protecting equipment from damage is always foremost, but more and more clients are asking engineers to reduce unnecessary downtime as well. From healthcare providers to data center facilities to high-tech manufacturers, the trend is to make systems more selective than ever before. In this issue we explore various aspects of protection, and we hope you will find something of value. As always, feel free to e-mail us at the "Contact Us" links below if you have any questions or comments.
- The Editor
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?
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