Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1994-03-17
1995-08-01
Raynolds, Bruce A.
Industrial electric heating furnaces
Arc furnace device
Power supply system
373102, 373104, H05B 7144
Patent
active
054385881
ABSTRACT:
The direct current-electric arc furnace system includes a furnace vessel 8, one or more electric arc electrode 7 connected as a cathode, a bottom contact 12 connected as an anode, a furnace transformer 2 and a rectifier assembly 5 for feeding the furnace, an electrode control system E, and a current regulator I. A choke 6 is switched into the direct current main current circuit. A voltage control circuit F underlies the current control circuit I, whereby the output voltage of the current regulator 14 delivers the desired value for the voltage regulator 24. A filter 25 tuned to the flicker frequency follows the voltage regulator 24 with a frequency response, which is tuned to the frequency sensitivity of the human eye. Optionally, an additional control voltage signal U.sub.flick that is delivered by flicker meter can be provided to the voltage control circuit F. With a furnace control constructed in such a manner it is possible to obtain an optimal integration of the effective power that is made available by the furnace transformer 2 and rectifier 5 and simultaneously to dampen modulation swings and thus reactive power surges that lead to flicker.
REFERENCES:
patent: 4324944 (1982-04-01), Weihrich et al.
patent: 4607373 (1986-08-01), Bergman
patent: 4663764 (1987-05-01), Bretthauer et al.
patent: 4677643 (1987-06-01), Dicks
patent: 4683577 (1987-07-01), Bretthauer et al.
patent: 5155740 (1992-10-01), Ao et al.
"Flickermeter-Functional and Design specifications", publication 868 (1986).
Bordignon, Paolo, u.a.: Statische Kompensation von Blindleistung. In: etz, Bd.106, 1985, H.24, S. 1264-1266.
ABB Management AG
Hoang Tu
Raynolds Bruce A.
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