By Topic

Method for Determining Selective Capability of Current-Limiting Overcurrent Devices Using Peak Let-Through Current—What Traditional Time–Current Curves Will Not Tell You

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Valdes, M.E. ; GE Consumer & Ind., Plainville, CT, USA ; Crabtree, A.J. ; Papallo, T.

Time-current curves are the accepted industry standard for predicting overcurrent device operation and analyzing selective behavior under overload or fault conditions. A conservative interpretation of drawn curves has sufficed for many years and provided acceptable performance. However, recent emphasis on better selectivity while still trying to provide optimal protection increases the demand for more accurate selectivity predictions. Currently, manufacturers are publishing tables and other guidelines to facilitate the selection of optimally coordinated devices by systems designers. However, no standard or single methodology exists for the creation of these tables. The writers shall present three methods of device interaction analysis based on peak let-through current, suitable for predicting selective behavior of protective devices above what time current curves may indicate. The method may be applied with published information or manufacturer's internal test information.

Published in:

Industry Applications, IEEE Transactions on  (Volume:46 ,  Issue: 2 )