| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 373102000 | Power supply system | 25 |
| 20120314728 | SYSTEM AND METHOD TO DELIVER AND CONTROL POWER TO AN ARC FURNACE - A power supply system for an arc furnace includes a three phase transformer assembly, back to back SCRs coupled between a power source and the three phase transformer assembly primary windings, and three saturable-reactors, coupled between the three phase transformer assembly secondary windings and a load. A controlled DC current source is coupled between a system controller and each of said three saturable-reactors. The system controller is configured for monitoring the power source and an output current at the load, and for controlling the back-to-back SCRs and the current source. | 12-13-2012 |
| 20130121365 | Electrode Consumption Monitoring System - A method and system automatically determines when an electrode add event occurs in an electric arc furnace having a plurality of electrode columns, each carried by an electrode positioning system. Data is received correlating to the harmonic distortion of the electrical current output to the plurality of electrode columns. Data is also received correlating to control pressures in the electrode positioning systems. Steady state control pressure data is captured when the harmonic distortion data indicates a steady state condition. An electrode add event is thereafter determined when a pressure spike is identified in the steady state control pressure data. | 05-16-2013 |
| 20160131428 | METHOD FOR DETECTION OF THE LOSS OF AN ELECTRIC ARC FURNACE MEASUREMENT REFERENCE - An electric arc furnace (EAF) including a raw material container, a set of electrodes, a set of electrical potential transformers, and a reference signal verification device. The set of electrodes are configured to be controllably extended toward the raw material container. The set of electrical potential transformers are correspondingly coupled to the set of electrodes. The reference signal verification device is configured to carry out the steps of reading a reference signal value coming from the raw material container; comparing the reference signal value to an approximated value; and determining that there is a loss of the reference signal if the reference signal value is not within a predetermined amount of the approximated value. | 05-12-2016 |
| 373103000 | Cable or cable suspension arrangement | 1 |
| 20160029443 | ELECTRIC CIRCUIT FOR ELECTRIC ARC FURNACE - The method for adjusting the impedance of one or more phases of a secondary circuit of an electric furnace, in order to limit the unbalance between the phases themselves comprises the transformer ( | 01-28-2016 |
| 373104000 | With power regulation | 20 |
| 20080198894 | Method For Regulating the Melting Process in an Electric-Arc Furnace - In a method for regulating the melting process in an electric-arc furnace ( | 08-21-2008 |
| 20080285615 | Method for Determining at Least One State Variable of an Electric Arc Furnace, and Electric Arc Furnace - In a method for determining a state variable of an electric arc furnace, especially for determining the level of the foamed slag ( | 11-20-2008 |
| 20090219968 | CONTROL SYSTEM FOR AN ARC FURNACE - A control system for and method of controlling a vertical position of at least one electrode of an arc furnace, where the arc furnace comprises a furnace transformer having a primary, input side and a secondary, output side which is electrically connected to the at least one electrode, the control system comprising: at least one current-measuring device for measuring a current as drawn by the arc furnace; a voltage-measuring device for measuring a voltage as applied across the arc furnace; and a control unit for dynamically determining a setpoint for the vertical position of the at least one electrode based on the measured values of current and voltage, and providing an actuating output for driving a lifting arrangement to adjust the vertical position of the at least one electrode so as to follow the dynamically-determined setpoint. | 09-03-2009 |
| 20090238234 | METHOD FOR OPERATING A MELT-METALLURGIC FURNACE, AND FURNACE - The invention relates to a method for operating a melt-metallurgic furnace ( | 09-24-2009 |
| 20100124247 | Sensor system for bottom electrodes of an electric arc furnace - A sensor system for monitoring and controlling the performance of the bottom electrode and the deflection of an electric arc in an electric steel making furnace includes an organized matrix of anode pins interspersed with refractory material and extending toward an electrically conductive plate secured to distal ends of the anode pins. A sensing device includes two temperature sensors at spaced apart locations along each of a distributed select group of anode pins for providing corresponding electrical signals and a current sensor responsive to electrical current flowing through the anode pins of the distributed select group of anode pins for providing a corresponding electrical signal. A controller responsive to the electrical signals derived at the anode pins of the select group operates the power supply and a display for monitoring the electrical performance of the elongated anode pins for heating by the electric arc in the furnace. | 05-20-2010 |
| 20110176575 | POWER SUPPLY SYSTEM FOR A POLYPHASE ARC FURNACE WITH AN INDIRECT CONVERTER BETWEEN A MAINS CONNECTION AND A FURNACE TRANSFORMER - In a power supply system for a three-phase arc furnace ( | 07-21-2011 |
| 20110216802 | POWER SUPPLY ARRANGEMENT - A power supply arrangement for supplying a square-wave current (I | 09-08-2011 |
| 20120183010 | METHOD FOR CONTROLLING A MELT PROCESS IN AN ARC FURNACE AND SIGNAL PROCESSING COMPONENT, PROGRAM CODE AND DATA MEDIUM FOR PERFORMING SAID METHOD - A method for controlling a melt process in an arc furnace and signal processing component, program code, and data medium for performing said method are provided. According to the method, sound signals or vibrations from the interior of the furnace container are captured by solid-borne sound sensors, from which characteristic values can be derived for the distribution of melting material, melt, and slag in the furnace fill. A characteristic value SM for thermal radiation impinging on the furnace wall of the container, a characteristic value M for the lumpiness of the melting material in the volume of furnace fill, and a characteristic value MM for the change to the portion of solid melting material contacting the furnace wall are generated in priority sequence. The energy distribution at the electrodes is changed by a control system analyzing the characteristic values in priority sequence, such that thermal load peaks are dampened or even completely prevented. To this end, the strand impedances stored as target values are modified. If the control is not sufficient, the thermal power of the arc is reduced as a subordinate means. A rapidly and reliably effective operating regime for the processes in the arc furnace can thereby be implemented. | 07-19-2012 |
| 20120320942 | METHOD FOR OPERATING AN ARC FURNACE, CONTROL AND/OR REGULATING DEVICE FOR AN ARC FURNACE, AND ARC FURNACE - An arc furnace, a control and/or regulating device for an arc furnace, and a method for operating an arc furnace are provided, wherein an arc for melting metal is generated by at least one electrode, wherein an arc associated with the electrode(s) has a first radiation power based on preselected operating parameters, wherein the arc furnace is operated according to a predefined operating program based on an expected process sequence, wherein monitoring is performed to detect whether an undesirable deviation exists between the actual process sequence and the expected process sequence. Because a modified second radiation power is specified if a deviation is present, and a modified second set of operating parameters, e.g., impedance value(s), is determined based on the modified second radiation power, a method is provided that permits a minimal melting time while minimizing consumption of operating resources, e.g., with respect to arc furnace cooling. | 12-20-2012 |
| 20130083819 | METHOD FOR OPERATING AN ARC FURNACE, OSCILLATION MEASUREMENT DEVICE FOR AN ARC ELECTRODE AND CONFIGURATION FOR AN ARC FURNACE - A method for operating an arc furnace, an oscillation measurement device for an arc electrode, and a configuration for the arc furnace are described. Using simple measures for operating the arc furnace, it is possible to carry out, in a particularly safe and productive manner, an oscillation measurement on the at least one arc electrode. On the basis of which the operation of the configuration for the arc furnace can be controlled with regard to the mechanical and/or electrical operating parameters. | 04-04-2013 |
| 20140072011 | Sensor system for bottom electrodes of an electric arc furnace - A sensor system for monitoring and controlling the performance of the bottom electrode and the deflection of an electric arc in an electric steel making furnace includes an organized matrix of anode pins interspersed with refractory material and extending toward an electrically conductive plate secured to distal ends of the anode pins. A sensing device includes two temperature sensors at spaced apart locations along each of a distributed select group of anode pins for providing corresponding electrical signals and a current sensor responsive to electrical current flowing through the anode pins of the distributed select group of anode pins for providing a corresponding electrical signal. A controller responsive to the electrical signals derived at the anode pins of the select group operates the power supply and a display for monitoring the electrical performance of the elongated anode pins for heating by the electric arc in the furnace. | 03-13-2014 |
| 20140086272 | Sensor system for bottom electrodes of an electric arc furnace - A sensor system for monitoring and controlling the performance of the bottom electrode and the deflection of an electric arc in an electric steel making furnace includes an organized matrix of anode pins interspersed with refractory material and extending toward an electrically conductive plate secured to distal ends of the anode pins. A sensing device includes two temperature sensors at spaced apart locations along each of a distributed select group of anode pins for providing corresponding electrical signals and a current sensor responsive to electrical current flowing through the anode pins of the distributed select group of anode pins for providing a corresponding electrical signal. A controller responsive to the electrical signals derived at the anode pins of the select group operates the power supply and a display for monitoring the electrical performance of the elongated anode pins for heating by the electric arc in the furnace. | 03-27-2014 |
| 20140177668 | ARRANGEMENT AND METHOD FOR LOAD COMPENSATION - An arrangement and method for load compensation in an electrical power network includes at least one voltage stabilization apparatus and at least one load line including at least one load compensation apparatus, at least one load and at least one separation reactor. In the arrangement, the separation reactor is to be connected in series with the load compensation apparatus and the load line is to be connected in parallel with the voltage stabilization apparatus. | 06-26-2014 |
| 20140185645 | METHOD FOR OPERATING AN ELECTRIC ARC FURNACE AND MELTING PLANT HAVING AN ELECTRIC ARC FURNACE OPERATED ACCORDING TO SAID METHOD - In a method for operating an electric arc furnace operated with an alternating voltage, a structure-borne sound signal occurring on a wall of the electric arc furnace is detected, from which structure-borne sound signal a parameter characterizing the flicker properties of the electric arc furnace is calculated. At least one process variable of the electric arc furnace is controlled on the basis of the calculated parameter. An electric arc furnace operated according to the method is used in and for a melting plant. | 07-03-2014 |
| 20150049780 | METHOD FOR OPERATING AN ARC FURNACE AND SMELTING SYSTEM HAVING AN ARC FURNACE OPERATED ACCORDING TO THE METHOD - At least one measurement value of a measurement variable characterizing the operating state of each of a plurality of system components that influence the operating conditions of an arc furnace is detected and compared to a respective currently permissible threshold value for the measurement variable. A maximum power that can be supplied to the arc furnace within a time window while satisfying all currently permissible threshold values is determined based on the result of the comparison. | 02-19-2015 |
| 20150308747 | Apparatus to Control the Total Energy Flux into the Top Ingot Surface During Vacuum Arc Remelting Processes - A Vacuum Arc Remelting controller apparatus wherein process control is accomplished primarily through control of pool power. Pool power being defined as the total energy flux into a top ingot surface of the VAR ingot. The controller apparatus of the present invention comprises a controller computer that transmits commands to the host furnance through an ethernet connection. | 10-29-2015 |
| 373105000 | By changing arc length | 4 |
| 20090232181 | SYSTEMS AND METHODS FOR CONTROLLING THE ELECTRODE POSITION IN AN ARC FURNACE - Embodiments of a system for controlling the position of an electrode in an arc furnace comprise an arc furnace comprising a molten bath and slag disposed over the molten bath, wherein the slag contacts the molten bath at an interface. The system further comprises an electrode comprising a lower tip, wherein the electrode is configured to deliver current by disposing the lower tip of the electrode below the upper surface of the slag. The current is substantially directed through the slag to the interface. The system also comprises a control system configured to determine the position of the lower tip of the electrode relative to the upper surface of the slag based on harmonic frequencies associated with the current, wherein the lower tip position relative to the upper surface of the slag correlates to the harmonic frequencies. | 09-17-2009 |
| 20130279535 | Method and Device for Closed-Loop Control of the Electrode Gap in a Vacuum Arc Furnace - The invention relates to a method as well as a device for closed-loop control of the electrode gap in a vacuum arc furnace ( | 10-24-2013 |
| 20140112365 | METHOD FOR OPERATING ALTERNATING-CURRENT ELECTRIC ARC FURNACE, DEVICE FOR PERFORMING METHOD, AND ALTERNATING-CURRENT ELECTRIC ARC FURNACE HAVING SUCH DEVICE - During operation of an alternating-current electric arc furnace, which has at least one electrode for producing a melt, vibrations are measured at a wall of a furnace vessel, whereby a slag height of the melt is determined. A rapid reaction to the change in the slag height is made possible by adjusting the arc length of the at least one electrode in the case of deviations of a measured actual value of the slag height from a target value. | 04-24-2014 |
| 373106000 | Using a hydraulic or pneumatic device | 1 |
| 20160105932 | METHOD AND APPARATUS FOR DYNAMIC SELECTION OF ELECTRIC ARC-FURNACE CONTROL SET-POINTS - An electric arc furnace (EAF) including a set of mast hydraulics, a current transformer, a voltage transformer, a legacy control system and a set-point modifier. The legacy control system is in control of the set of mast hydraulics of the EAF, and receives information from the current transformer relative to current being supplied to the EAF and from the voltage transformer relative to voltage being applied to the EAF. The legacy control system using a set of set-points for the control of the set of mast hydraulics, the voltage and the current of the EAF. The set-point modifier communicates with the legacy control system, and executes the steps of: evaluating a cost function of key performance indicators of a previous heat of the EAF, the key performance indicators including electrical energy use and/or electrode consumption; and altering the set of set-points dependent upon the cost function. | 04-14-2016 |
| 373108000 | D.C. power | 1 |
| 20080298425 | Method and apparatus for melting metals using both alternating current and direct current - A furnace for melting metals includes a crucible, a direct current arc source and an induction coil powered by alternating current. The furnace is particularly useful for melting charges of highly reactive metals such as titanium, zirconium and their alloys without contaminating these charges. The direct current arc source melts generally from the inside out while the water-cooled induction coil serves to cool the crucible and form a skull along the crucible sidewall which protects the crucible from interacting with the molten metal. The induction coil is thus used for cooling as well as heating and stirring the melt, and helps control the thickness of the skull. | 12-04-2008 |
