Patent ID: 6415244
Filing Date: 2002-07-02
Classification: G01R

Abstract:
A system, comprising: a data recorder to monitor an electrical power transmission, said data recorder including:a plurality of analog input channels; a converter to digitize an analog signal from at least one of said analog input channels; a signal analysis subsystem responsive to said converter to provide: (a) a first data stream at a first rate, said first data stream being a digitized form of said analog signal; (b) a second data stream calculated from said first data stream, said second data stream including a phasor representation of said analog signal and being provided at a second rate slower rate than said first rate; (c) a trigger signal responsive to a predetermined condition of said first data stream or said second data stream representative of an electrical power transmission anomaly; and wherein said subsystem is operable to generate a data record in response to said trigger signal, said data record including a prefault data segment corresponding to a time period before said anomaly starts and a postfault data segment corresponding to a time period after said anomaly ceases, said prefault data segment and said postfault data segment each including at least a portion of said first data stream and said second data stream.