Evaluation of an Accelerated Overcurrent Protection for Single Circuit Breaker Distribution Feeder

This paper presents a new practical accelerated overcurrent protection scheme for single circuit breaker radial distribution feeder and the implementation of this new scheme into latest numerical relay. Extensive tests have been conducted using the real time digital simulator (RTDS) with respect to a typical single circuit breaker multi-section system. The results prove that the new protection relay is able to not only significantly increase the speed of responses of conventional time grading protection scheme for single circuit breaker radial distribution feeders, but also remove faults from both ends of the protected lines section, therefore to achieve distribution automation