الفهرس 
COORDINATION OF OVERCURRENTOnly 14 pages are availabe for public view
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Abstract
This thesis proposes an adaptive schema to the coordination of inverse-time overcurrent relays that achieve possible optimization for changes in power system as network-topology, load or generation-level to ensure appropriateprotective coordination and operating time.The optimal settings for the relays are determined by using Modified Differential Evolution (MDE) algorithm and Firefly algorithm (FA) compared with Genetic algorithm (GA). The aim in selecting the settings of the relays is to achieve the possible minimum operating times while preserving coordination among all relays. The thesis shows that the results using the MDE algorithm and FA algorithm are close to the optimal solutions, and hence demonstrates and proves the validity of the two methods.