Direct current melting furnace with control of deflection of the

Details Direct current melting furnace with control of deflection of the Direct current melting furnace with control of deflection of the

1993-07-20

1995-01-17

Paschall, Mark H.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373 64, 373108, H05B 7144

Patent

active

053832183

ABSTRACT:
Direct-current smelting furnace with control of deflection of the electric arc, which comprises an upper electrode (13) with relative return-flow lines and a plurality of bottom electrodes (11) positioned on the hearth of the furnace (12) and arranged in two or more assemblies, each assembly having its own controlled supply line connected to its own transformer (16), there being included downstream of each transformer (16) its own thyristor rectifier assembly (17) associated with its own means to control voltage (26), current (24) and firing angle (23), at least the lines supplying the bottom conductors (32) being at least partly screened in the vicinity of the melting furnace (12)

REFERENCES:
patent: 4495625 (1985-01-01), Heberlein et al.
patent: 4725939 (1988-02-01), Boisdon
patent: 5138630 (1992-08-01), Suga
patent: 5191592 (1993-03-01), Janiak et al.
patent: 5237585 (1993-08-01), Stenkvist
Patent Abstracts of Japan vol. 14, No. 519 (M-1048) 14 Nov. 1990 & JP-A-22 17 783 (Daido Steel) Aug. 30, 1990.
Patent Abstracts of Japan vol. 15, No. 81 (M-1086) 25 Feb. 1991 & JP-A-23 02 581 (Daido Steel) 14 Dec. 1990.
Patent Abstracts of Japan vol. 14, No. 519 (M-1048) 14 Nov. 1990 & JP-A-22 17 782 (Daido Steel) 30 Aug. 1990.

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