Abstract
This paper presents the development of a sensitive ground overcurrent protection algorithm. The proposed algorithm is able to detect high-impedance faults produced by downed conductors in solidly grounded primary distribution networks. It presents a higher level of accuracy when compared to conventional overcurrent protection functions. The algorithm is based only on current measurements and uses additional conditions to generate the trip signal, in order to prevent false tripping due to its high level of sensitivity. This paper presents a detailed description of the proposed algorithm, the hardware prototype developed during the research and its performance in laboratory tests.
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