Electric power supply apparatus for an electric furnace
AssigneeDanieli Automation S.P.A.
InventorAntonello MORDEGLIA
Life of this patent
Estimating the term…
Abstract
An electric power supply apparatus for an electric furnace includes at least one base power supply module configured to convert electric energy supplied by a three-phase electric network and supply at output at least one pair of single-phase alternating currents and voltages having a desired intensity and frequency, and having at least two sub-modules, each of which includes a rectifier device, a direct current intermediate circuit, and at least one inverter device.
Claims13
Electric power supply apparatus for an electric furnace for steelmaking applications or sectors that process metals or vitreous materials, comprising at least one base power supply module configured to convert electric energy supplied by a three-phase electric network and supply at output at least one pair of single-phase alternating currents and voltages having a desired intensity and frequency, and having at least two sub-modules each of which comprises, disposed in succession one to the other, a rectifier device configured to transform a three-phase alternating electric current and voltage into direct electric current and voltage, a direct current intermediate circuit, or DC-link, configured to store electric energy, and at least one inverter device connected to said intermediate circuit and configured to transform the direct current and voltage into single-phase alternating electric current and voltage, wherein all the intermediate circuits of the at least one base power supply module are short-circuited with respect to each other by means of shorting connections.
Method for powering an electric furnace for steelmaking applications or sectors that process metals or vitreous materials, having two or more electrodes said method comprising:
- supplying, by means of a three-phase electric network, a three-phase alternating electric current and voltage having a predefined frequency to at least one base module comprising two or more sub-modules, each configured to receive at input three-phase electric voltage and current and supply at output respective single-phase alternating voltages and currents having a desired intensity and frequency;
- powering respective electrodes of said electric furnace by means of said single-phase alternating voltages and currents,
- wherein in each of said sub-modules, there is provided a rectifying of the respective phase voltages and currents to obtain a direct electric voltage and current which are common for the three phases, a temporary storage of energy and a separation between said electric network and said electrodes by means of a direct current intermediate circuit, and an inversion of the direct electric voltage and current by means of at least one inverter device to obtain respective single-phase alternating electric voltages and currents, wherein the method provides a short-circuit with respect to each other all the intermediate circuits of said at least one base power supply module by means of shorting connections in such a way as to bring them to a same electric potential.
Dependencies are inferred from the claim text.