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Disturbance Monitoring Equipment

Devices capable of monitoring and recording system data pertaining to a Disturbance. These include: Sequence of event recorders, Fault recorders: This may include protective relays, Dynamic Disturbance Recorders (DDRs), which record incidents that portray power system behavior during dynamic events such as low-frequency (0.1 Hz - 3 Hz) oscillations and abnormal frequency or voltage excursions. PMUs and any other equipment that meets the functional requirements of DMEs may qualify as DMEs.