Protective relay apparatus

Details Protective relay apparatus Protective relay apparatus

1978-11-08

1980-06-17

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 76, 361113, 340658, H02H 706

Patent

active

042086876

ABSTRACT:
Protective relay apparatus which includes monitoring and detecting functions related to subsynchronous currents in a three-phase electrical power system. The monitoring function provides signals related to the positive sequence component of any subsynchronous current flowing at a monitored subsynchronous frequency. The detecting function is responsive to the signals provided by the monitoring function, distinguishing between subsynchronous currents due to self-excited oscillations, and those due to transient oscillations, to provide a timely trip signal for a circuit breaker in either instance.

REFERENCES:
patent: 3813593 (1974-05-01), Tice et al.
patent: 3992651 (1976-11-01), Hodges

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