Title:
DC ARC FURNACE POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP3041317
Kind Code:
B2
Abstract:
PURPOSE: To fix reactive power by leaving its reference value left as calculated from a load current setting signal, load voltage setting signal and an AC input voltage setting signal to a rectifying circuit in a predetermined operation condition, and controlling a firing position of a rectifying element so that the actual load current agrees with this reference value.
CONSTITUTION: AC power from an AC power supply 1 is given to a rectifying circuit 3 through a transformer 2, and the obtained DC power is given to an electrode 6 through a DC reactor 4 and supplied to a DC arc furnace 5 having a melting steel reservoir pot 7. Here, a current detector 8 is inserted between the transformer 2 and the circuit 3 to feed an output of this detector to a subtracter 10 and also an output from a thyristor, provided in the circuit 3, to the subtracter 10 through a firing pulse generator 11. Next, an output of the subtracter 10 is given to an operation condition setting signal generator 9A through a load current refference signal generator 20, and the actual load AC agrees with a reference signal of the generator 20 by an output of this generator 9A. Thus by an arc short-circuit or the like, even when load impedance is changed, reactive power is fixed.
Inventors:
Eiji Kamimukai
Application Number:
JP207192A
Publication Date:
May 15, 2000
Filing Date:
January 09, 1992
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H05B7/144; (IPC1-7): H05B7/144
Domestic Patent References:
| JP5135871A |
Attorney, Agent or Firm:
Kaneo Miyata (2 outside)