Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1994-12-01
1997-01-14
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324771, 324772, 324 7639, 327 90, 327113, G01R 2728
Patent
active
055943500
ABSTRACT:
An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to be used for correction being detected with a frequency detector 103, frequency correction of the gain of the detected signal being performed with a frequency corrector 104, 114 after detecting the root-mean-square value of the frequency, the corrected signal being supplied to a digital automatic voltage regulator 120. Thereby, it is possible to remove a direct current component and absorb a surge in a signal, and to correct the signal in coping with the fluctuation of the input signal to detect a stable signal.
REFERENCES:
patent: 4741023 (1988-04-01), Lawson
patent: 5097219 (1992-03-01), Itoh
patent: 5132633 (1992-07-01), Wong et al.
patent: 5391982 (1995-02-01), Kim
patent: 5394025 (1995-02-01), Pierson
Banjo Minoru
Koizumi Yutaka
Wakugawa Takeshi
Brown Glenn W.
Hitachi , Ltd.
Hitachi Electric System Company, Ltd.
Wieder Kenneth A.
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