Abstract
In modern power systems, there is a possibility that the power system topology may change due to the trip of power lines or distributed generations due to maintenance or fault. Since changes in the topology of the power system affect the magnitude and flow of the fault current, the optimally calculated setting values with the original topology may not provide the correct protection coordination. Therefore, protection method considering the change of topology is required, and in this paper, three protection methods, Protection method with fixed setting values, Adaptive protection method, Protection method with clustering, are introduced. At last, three protection methods are compared with 30 Directional OverCurrent Relays (DOCRs) in IEEE 30 bus test system.
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