Frequency measuring and monitoring apparatus, methods and system

Details Frequency measuring and monitoring apparatus, methods and system Frequency measuring and monitoring apparatus, methods and system

1980-02-21

1982-03-09

Wise, Edward J.

Boots, shoes, and leggings

324 77B, 324 78D, 364576, 361 78, G06F 1556, G01R 2316

Patent

active

043193293

ABSTRACT:
Waveform frequency measuring apparatus and methods utilizing zero-crossing triggered analog-to-digital conversion apparatus combined with Discrete Fourier Transform (DFT) digital computing apparatus accomplish measurement of waveform fundamental frequency using hitherto disadvantageous leakage of the Discrete Fourier Transform.
In an example, the frequency measuring apparatus and methods are used in an alternating current (AC) electrical power system for measuring and monitoring frequency deviation .DELTA.f from the nominal system frequency f and actuating protective relaying when the frequency deviation is excessive.

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Use Of The Discrete Fourier Transform In The Measurement of Frequencies and Levels of Tones, Rife & Vincent, The Bell System Technical Journal, Feb. 1970, pp. 197-205.
High-Accuracy Analog Measurements Via Interpolated FFT, Jain, et al., IEEE Transactions on Instrumentation Measurement, vol. IM-28, No. 2, Jun. 1979, pp. 113-122.
Load-Shedding And Frequency Relaying, E. A. Udren, Applied Protection Relaying, Westinghouse Electric Corp., Newark, 1976, pp. 21-1 to 21-16.
One-Line Relaying With a Digital Computer, Gilcrest, et al., Silent Sentinels, RPL 71-3, Aug. 1971, pp. 1-17.

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