Relay protection systems play a critical role in detecting faults, isolating them, and preventing widespread outages. These systems rely on advanced equipment, including the relay test unit, to ensure optimal performance in detecting abnormal conditions such as short circuits or. Selectivity is a mandatory requirement for all protection, but the importance of it depends on the application. As technology advances and grids become smarter, the tools used to test and maintain these systems, such as the relay test set, are evolving to meet new challenges. This study. Fault tracking means that after the failure of relay protection devices, the anomalies and warning informa-tion are obtained through data-mining technology, and then, the fault tracking algorithm is used to find the cause of failure.
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