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Optimal coordination of directional overcurrent relays considering definite time backup relaying

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2 Author(s)
Perez, L.G. ; Univ. Simon Bolivar, Caracas, Venezuela ; Urdaneta, A.J.

A methodology is presented for the consideration of definite-time backup relays in the optimal coordination of directional overcurrent relays using linear programming. It is shown that the influence of considering second-zone distance relays and breaker failure relays impose important requirements for the determination of the time dial settings of directional overcurrent relays. The paper introduces a revised formulation of the optimization problem. Results are presented for the application of the methodology on a power system with 2 generators, 9 buses, 2 transformers and 7 transmission lines

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Power Delivery, IEEE Transactions on  (Volume:14 ,  Issue: 4 )