Method for stabilizing an AC system against reactive-load fluctu

Details Method for stabilizing an AC system against reactive-load fluctu Method for stabilizing an AC system against reactive-load fluctu

1997-05-30

1998-09-15

Hoang, Tu B.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373108, 323210, H05B 7148

Patent

active

058090541

ABSTRACT:
In operation, DC arc furnaces generate undesired reactive load fluctuations which are compensated for by a power controller without special compensation reactance. In order to permit a melting operation of the arc furnace in weak AC systems the DC furnace is operated with at least two melting electrodes. A current controller is connected to each cathode via rectifiers. Each cathode is controlled with respect to its spacing from a melt by an electrode adjusting device and an electrode controller. Only one current controller one electrode controller are operationally connected, on an input side, to a power factor controller. Power factor control is thus performed with only one electrode assembly.

REFERENCES:
patent: 4121150 (1978-10-01), Kelley, Jr.
patent: 4691325 (1987-09-01), Boisdon
patent: 5610937 (1997-03-01), Gaupp
patent: 5617447 (1997-04-01), Tambe
patent: 5627454 (1997-05-01), Aebischer et al.

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