Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonlinear
Patent
1989-06-08
1990-07-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonlinear
324111, 361 86, 361 94, G01R 2900, H02H 300
Patent
active
049437666
ABSTRACT:
A method of detecting amplitude value of AC electric quantity in electric power system, where five sampling values obtained in sampling performed in sequence at a period of 1/4 of the period of the rated frequency of the AC electric quantity are used, and the first through fifth sampling values are squared respectively and the squared values of the second and fourth sampling values are multiplied by four and the squared value of the third sampling value is multiplied by six and the sum total of these values is obtained, and then the sum total is divided by eight and its square root is estimated, thereby the amplitude value of the AC electric quantity is obtained. Even if the frequency of the AC electric quantity to be detected is varied about .+-.5%, its amplitude value can be operated with good accuracy and the operation result can be obtained at high speed.
REFERENCES:
patent: 4672501 (1987-06-01), Bilac et al.
patent: 4774621 (1988-09-01), Andow
patent: 4885656 (1989-12-01), Suzuki et al.
Eisenzopf Reinhard J.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Vinh P.
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