The Frequency Disturbance Recorder, or FDR, is a GPS-synchronized single-phase PMU that is installed at ordinary 120 V outlets.
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Researchers at Virginia Tech received a NSF MRI grant from the National Science Foundation to develop the system, which became known as FNET . The first Frequency Disturbance Recorder was developed in 2003 with support from TVA ( Tennessee Valley Authority ) and ABB . The FNET the system went online in 2004.
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