Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-08-01
1985-10-15
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78D, G01R 2302
Patent
active
045477264
ABSTRACT:
Samples from a first and second cycle of a system signal are used to generate discrete Fourier transforms for the respective first and second cycle. Multiplication of the discrete Fourier transform of the second cycle by the complex conjugate of the discrete Fourier transform of the first cycle produces a frequency deviation phasor whose angle with respect to the real axis is representative of the frequency deviation of the system signal from a predetermined reference frequency. Actual system frequency may be determined by obtaining the inverse tangent of the angle of the frequency deviation phasor with respect to the real axis.
Apparatus for determining the frequency and frequency deviation of a system signal is disclosed as is a method and apparatus for determining frequency and frequency deviation of a system signal comprising a plurality of phases.
REFERENCES:
patent: 3755734 (1973-08-01), Blanyer
patent: 3895293 (1975-07-01), Munz
patent: 4123704 (1978-10-01), Johnson
patent: 4317223 (1982-02-01), Farmer
A. G. Phadke et al., "A New Measurement Technique for Tracking Voltage Phasors, Local System Frequency, and Rate of Change of Frequency", IEEE Transactions on Power Apparatus and Systems, vol. PAS-102, No. 5, May 1983, pp. 1025-1038.
Davis Jr. James C.
Fox George B.
General Electric Company
Lacomis Bernard J.
Raevis R.
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