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Protection & Control
Out-of-step discrimination
Based on measurement impedance, R-X plane is divided into six sequential zones. The PCS-993 controller provides two tripping modes for different oscillation cycles; which are the fast tripping mode and the slow tripping mode. The fast tripping mode can operate in the first cycle of out-of-step for oscillation cycles of 200ms and above. The slow tripping mode operates in the second cycle of out-of-step for oscillation cycles of 100ms~200ms. The slow tripping mode operates with the same criteria as fast tripping mode but after 2~15 cycles out-of-step subject to the setting. Therefore, it only serves as a backup operation.
Protection zone restriction
According to dedicated zone measurement elements, the operating zone is individually determined.
Out-of-step Protection (78)
Separation
Shutdown
Trigger synchronism
