Device for generating a signal corresponding to a variable magni

Details Device for generating a signal corresponding to a variable magni Device for generating a signal corresponding to a variable magni

1985-04-08

1986-12-30

Heyman, John S.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333167, 333176, 333181, 323208, H02J 318

Patent

active

046331840

ABSTRACT:
A device generates a signal corresponding to a variable magnitude associated with the reactive power of an arc furnace, in order to control a reactive power compensator. It comprises a reactive power or voltage demodulator and a set of filters connected to the output of the demodulator. The set of filters comprises active bandstop filters having a bandwidth of .+-.F relative to frequencies of 2f.sub.O, 4f.sub.O and 6f.sub.O and narrowband active bandstop filters having a bandwidth of substantially .+-.2 Hz relative to frequencies of f.sub.O and 3f.sub.O. f.sub.O is the supply frequency and F is approximately f.sub.O /2. The device further comprises a phase advance corrector circuit operative in the frequency band O-F connected to the output of the set of filters.

REFERENCES:
patent: 2730667 (1956-01-01), Uhlmann
patent: 3267359 (1966-08-01), Anderson
patent: 3571767 (1971-03-01), Bush
patent: 4135128 (1979-01-01), Kelly
patent: 4275346 (1981-06-01), Kelley, Jr.
patent: 4496859 (1985-01-01), Crooks
Brown Boveri Review, vol. 70, No. 9/10, Sep. Oct. 1983, pp. 330-340, "Compensation Systems for Industry", Baden (H) E, Wanner et al.

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