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Middle three plots show the three-phase currents (Ii). The sinusoidal variation in these plots corresponds to 60 Hz. The bottom plot shows instantaneous power, P, as the sum of the products of the three-phase currents times the corresponding voltages. See text for discussion. 26 Fig. 5. Linear measures for the air-gap seeded-fault. Top plot shows various linear measures of instantaneous power, P: minimum (Pn) as the bottom curve, maximum (Px) as the top curve, average plus one standard deviation (P + σP) as the middle top curve, and average minus one standard deviation (P - σP) as the middle bottom curve.

Typical baseline data vs time from the Allis Chalmers motor. Top three plots show the three-phase voltages (Vi). Middle three plots show the three-phase currents (Ii). The sinusoidal variation in these plots corresponds to 60 Hz. The bottom plot shows instantaneous power, P, as the sum of the products of the three-phase currents times the corresponding voltages. See text for discussion. 26 Fig. 5. Linear measures for the air-gap seeded-fault. Top plot shows various linear measures of instantaneous power, P: minimum (Pn) as the bottom curve, maximum (Px) as the top curve, average plus one standard deviation (P + σP) as the middle top curve, and average minus one standard deviation (P - σP) as the middle bottom curve.

Second plot down shows skewness (solid) and kurtosis (- -) in the instantaneous power. Third plot down shows the number of time steps per cycle in the instantaneous power. Bottom plot shows the lag in time steps, corresponding to the first zero in the autocorrelation function. See text for discussion. 27 Fig. 6. Conventional nonlinear measures for the air-gap seeded-fault. Top plot shows the location (in time steps) of the first minimum in the mutual information function. The middle plot shows the correlation dimension (D).

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Ann Rpt - Forewarn of Failure - Critical Equip at Next-Gen Nuclear Powerplants


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