Circuit arrangement for supplying electrode melting furnaces

Details Circuit arrangement for supplying electrode melting furnaces Circuit arrangement for supplying electrode melting furnaces

1974-12-20

1976-04-20

Envall, Jr., R. N.

H05B 7148

Patent

active

039521397

ABSTRACT:
The invention concerns a converter arrangement for electrode melting furnaces, particularly for electric slag remelting of metals. A current regulator in the form of a PI controller is associated with the converter arrangement. The former is influenced by an actual current value, a reference current value, and additionally, by a control quantity. The control quantity replaces the current regulation of the regulator by a voltage control in dependence on periodic or aperiodic conditions which may be due to operational causes or to trouble and interfere with the melting process in the furnace. More particularly, for the duration of such conditions, the control quantity causes the output voltage of the regulator, which voltage acts on the control unit feeding the converter, to be limited upward to an adjustable value.

REFERENCES:
patent: 3530359 (1970-09-01), Grist
patent: 3660583 (1972-05-01), Takanasi
patent: 3746965 (1973-07-01), Okada
patent: 3803476 (1974-04-01), Reeve

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