Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1990-06-11
1991-10-01
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324130, 324140R, 324141, G01R 2106
Patent
active
050536974
ABSTRACT:
The invention relates to an input circuit for an electrical energy meter, which circuit has a current path and a voltage path, the current path being associated with a mutual conductance transformer. In order to compensate for the differentiating function of the transformer, but without introduicng interference signals, the current path includes an active filter connected as an integrator and provided with a coupling capacitance suitable for blocking low frequency signals.
REFERENCES:
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patent: 4250552 (1981-02-01), Elms
patent: 4356446 (1982-10-01), Battocetti
patent: 4591810 (1986-05-01), Mackenzie et al.
patent: 4596951 (1986-06-01), Heinrich et al.
patent: 4733171 (1988-03-01), Milkovic
patent: 4782287 (1988-11-01), Marx
patent: 4801874 (1989-01-01), Loeffler
Patent Abstracts of Japan, vol. 62, No. 7 (E-164), 15 Mar. 1983 & JP-A-57 207 412 (Fujitsu K. K.) 20-12-1982.
IEEE Transactions on Magnetics, vol. MAG-7, No. 3, Sep. 1971, pp. 438-442; D. R. Hamburg et al.: "An Electronic Wattmeter for Nonsinusoidal Lower Power . . . "
Patent Abstracts of Japan, vol. 94, No. 7 (E-171), 20 Apr. 1983; & JP-A-58 019 015 (NIPPON DENKI K. K..) 03-02-1983.
Carnel Alain
Gourc Rene
Kodras Rudolph
Asman Sanford J.
Burns William J.
Schlumberger Industries
Wieder Kenneth A.
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