Overcurrent Relays Coordination in Interconnected Networks Using Accurate Analytical Method and Based on Determination of Fault Critical Point


Overcurrent relays ought to be coordinated for various operation conditions in interconnected networks. Similarly, the time interval ought to not reach beneath the predefined threshold for every pair of primary and backup relays for the faults occurring within the protection zone of the primary relay. An analytical approach is presented during this paper to calculate the impedance matrix of the network in fault condition so as to see the crucial fault point accurately. Overcurrent relays are coordinated by using the presented vital fault point rather than the shut-in fault employed in previous studies. Simulation results show the accuracy of the proposed method for overcurrent relays coordination in comparison with different methods.

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