System for detecting alternating voltage and/or current

Details System for detecting alternating voltage and/or current System for detecting alternating voltage and/or current

1991-05-08

1994-03-29

Teska, Kevin J.

Boots, shoes, and leggings

324522, 364483, G06F 1556

Patent

active

052991490

ABSTRACT:
A system for detecting a voltage and/or current of a single phase and/or polyphase alternating current includes a sample-hold circuit that detects and holds instantaneous values of a plurality of sampling points over a fixed time period of the alternating current as sampled values. A first calculation circuit calculates the real part and the imaginary part of the Fourier coefficient with respect to a fundamental wave and/or a component of the positive-phase sequence of the alternating current detected from the plurality of sampled values thus held and outputs respective calculated values thereof. A second calculation circuit performs a predetermined calculation to the calculated values of the real and imaginary parts and thereby calculates and outputs the amplitude of the fundamental wave and/or component of positive-phase sequence of the alternating current.

REFERENCES:
patent: 4625283 (1986-11-01), Hurley
patent: 4644268 (1987-02-01), Malka et al.
patent: 4667198 (1987-05-01), Suzuki
patent: 4672555 (1987-06-01), Hart et al.
patent: 4709295 (1987-11-01), Yamaura et al.
patent: 4774621 (1988-09-01), Andow
patent: 4794369 (1988-12-01), Haferd
patent: 4811236 (1989-03-01), Brennen et al.
patent: 4947109 (1990-08-01), Suzuki
patent: 5027285 (1991-06-01), McCartney et al.
"Protective Relay Engineering", IEEEJ, 1981, pp. 112-113.

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