Boots – shoes – and leggings
Patent
1992-05-20
1993-09-07
Teska, Kevin J.
Boots, shoes, and leggings
324142, 364492, G06F 1556, G01R 2100
Patent
active
052435369
ABSTRACT:
In the present invention, true volt-amperes reactive power is measured by sampling instantaneous voltage values of voltage and substantially simultaneously instantaneous values of current of an arbitrary waveform, multiplying the voltage samples by the discrete Hilbert transform (corrected by a sign inversion) to obtain voltage samples of all frequencies shifted by -90.degree. over the bandwidth of the signal of interest and then multiplying this quadrature voltage sample by the corresponding current samples to obtain a true value for VARs, i.e., proportional to the instantaneous volt-amperes reactive power under all conditions. The sampling rate and the period of sampling determine the bandwidth and accuracy of the sampling technique. The invention can be implemented in software or in suitable hardware components capable of sampling and delaying the signal of interest.
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Oppenheim et al., "Digital Signal Processing", (Prentice-Hall, 1975), p. 360.
Lopez, R. A., et al., "Reactive Power Meter for Nonsinusoidal Systems", IEEE Trans. Instrum. Meas., vol. IM-26., pp. 258-260 (Sep. 1977).
Krajewski, R. A., "A Formal Aspect of the Difinition of Power", Measurement, vol. 8, No. II (Apr.-Jun. 1990).
Czarnecki, L., "One-Ports Which Realize the Hilbert Transformation and Their Application in Reactive Power Meters for Nonsinusoidal Systems", Archiwum Elektrotechniki, vol. 33, No. 3-4 (Poland, 1984).
Metricom, Inc.
Teska Kevin J.
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