Boots – shoes – and leggings
Patent
1989-12-06
1991-10-22
Lall, Parshotam S.
Boots, shoes, and leggings
324 77A, H02H 308, G06F 15134
Patent
active
050601660
ABSTRACT:
A method and apparatus for rapidly analyzing ac waveforms containing dc offset by generating digitized samples of the waveform to be analyzed with alternate samples separated by ninety electrical degrees. Alternate samples are paired for calculation of the magnitude and phase of the waveform. A suitable microcomputer performs a calculation using pairs of the most recently generated samples. Using the pairs of samples, the microcomputer calculates the dc offset, and the peak magnitude of the waveform which may be voltage or current. The phase angle of the waveform can also be calculated if required. The method and apparatus are particularly useful with protective systems where the calculation is necessary to determine whether there is a fault on an electric power transmission line. In addition, the effects of dc offset are eliminated and thereby false trips are avoided. A reliable system having a fast response time at relatively modest cost is provided.
REFERENCES:
patent: 3758763 (1973-09-01), Nohara et al.
patent: 4577279 (1986-03-01), Salowe
patent: 4625283 (1986-11-01), Hurley
patent: 4694402 (1987-09-01), McEaehern et al.
Engel Joseph C.
Mort Deborah K.
ABB Power T&D Company Inc.
Lall Parshotam S.
Ramirez Ellis B.
Rooney Rita M.
Westerhoff Richard V.
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