Patents by Inventor Kasegn D. Tekletsadik

Kasegn D. Tekletsadik has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9911910
    Abstract: In one embodiment a superconductor tape includes a substrate comprising a plurality of layers, an oriented superconductor layer disposed on the substrate, and an alloy coating disposed upon the superconductor layer, the alloy coating comprising one or more metallic layers in which at least one metallic layer comprises a metal alloy.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: March 6, 2018
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Connie P. Wang, Paul Sullivan, Paul Murphy, Kasegn D. Tekletsadik, Bharatwaj Ramakrishnan
  • Patent number: 9912148
    Abstract: A current limiter system includes a superconducting fault current limiter (SCFCL) operative to conduct load current during a normal operation state in which the SCFCL is in a superconducting state. The current limiter system also includes a shunt reactor connected in an electrically parallel fashion to the SCFCL and configured to conduct less current than the SCFL in the normal operation state, and a protection switch connected in electrical series with the SCFCL and shunt reactor and configured to disconnect the SCFCL for a predetermined time from a load current path during a fault condition after fault current exceeds a threshold current value.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 6, 2018
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Kasegn D. Tekletsadik, Charles L. Stanley
  • Patent number: 9768370
    Abstract: A superconductor tape includes a plurality of conductive strips having respective long directions parallel to a long tape direction of the superconductor tape, where each of the plurality of conductive strips separated from one another by a inter-strip region. The superconductor tape further includes a superconductor layer disposed adjacent the plurality of conductive strips, having a length along the long tape direction, where the superconductor layer comprises a plurality of superconductor strips disposed under the respective plurality of conductive strips, and a non-superconductor strip disposed adjacent the inter-strip region.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: September 19, 2017
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Connie P. Wang, Paul Sullivan, Paul Murphy, Kasegn D. Tekletsadik, Bharatwaj Ramakrishnan
  • Patent number: 9520713
    Abstract: A fault current limiter circuit including a fast switch fault current limiter (FSFCL) and a voltage control reactor (VCR) operative to conduct load current during a steady state operation and limit load current when the load current exceeds fault current limits. The FSFCL may include a breaker having electrical contacts, a coil electrically coupled to the electrical breaker contacts, a plunger mechanically coupled to the electrical breaker contacts, a parallel voltage control (VCR), a transient overvoltage control circuit (TOCC), wherein when current greater than a threshold level flows through the coil, a magnetic field having strength to move the plunger is generated, the movement of the plunger operates to open the contacts in the breaker and transfer fault current to VCR and TOCC and limit the overall system fault current.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: December 13, 2016
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Kasegn D. Tekletsadik, Charles L. Stanley
  • Patent number: 9450164
    Abstract: An electrical bushing is disclosed for use in high voltage cryogenic applications. The bushing including first and second bushing portions and an electrical conductor disposed longitudinally within the portions. The electrical conductor has a first terminal extending from the first bushing portion and a second terminal extending from the second bushing portion. The first terminal is configured to couple to a first electrical element at ambient temperature, and the second terminal is configured to couple to a second electrical element at cryogenic temperature. The first and second bushing portions comprise a base insulator material, while the first bushing portion further comprises an environmental protection layer disposed over the base insulator portion.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: September 20, 2016
    Assignee: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Kasegn D. Tekletsadik, Charles Stanley, Semaan Fersan, Nicholas A. Venuto, Scott Nickerson
  • Patent number: 9331476
    Abstract: A solid-state fault current limiter including a current splitting reactor, comprising a system current input, a passive current output and a control current output. A voltage control reactor includes a first end and a second end, the first end coupled to the control current output and the second end coupled to the passive current output. A fault current trigger circuit coupled in parallel with the voltage control reactor and configured to open when a fault current, received by the system current input, exceeds a predefined trigger current. A transient voltage control circuit coupled in parallel with the voltage control reactor to receive the fault current.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: May 3, 2016
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Kasegn D. Tekletsadik, Charles L. Stanley, Semaan Fersan, Piotr Lubicki
  • Patent number: 9270110
    Abstract: In one embodiment a fault current limiter comprises a current splitting reactor having interleaved windings to reduce an insertion impedance of the fault current limiter during non-fault conditions. The current splitting reactor having interleaved windings may include a first winding, the first winding including a plurality of sub-windings and a second winding, the second winding including a plurality of sub-windings, the sub-windings of the first winding and the sub-windings of the second winding wounds about the core and interleaved.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: February 23, 2016
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventor: Kasegn D. Tekletsadik
  • Publication number: 20150348680
    Abstract: A superconductor tape includes a plurality of conductive strips having respective long directions parallel to a long tape direction of the superconductor tape, where each of the plurality of conductive strips separated from one another by a inter-strip region. The superconductor tape further includes a superconductor layer disposed adjacent the plurality of conductive strips, having a length along the long tape direction, where the superconductor layer comprises a plurality of superconductor strips disposed under the respective plurality of conductive strips, and a non-superconductor strip disposed adjacent the inter-strip region.
    Type: Application
    Filed: September 17, 2013
    Publication date: December 3, 2015
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Connie P. Wang, Paul Sullivan, Paul Murphy, Kasegn D. Tekletsadik, Bharatwaj Ramakrishnan
  • Patent number: 9121879
    Abstract: Techniques for improving reliability of a superconducting fault current limiting system (SCFCL) are provided. In one particular exemplary embodiment, the technique may be realized as a method of improving a reliability of a superconducting fault current limiting system (SCFCL), the SCFCL system comprising a superconductor provided in a container. The method may comprise providing one or more sensors capable of detecting a fault current proximate to the superconductor; determining a change in the condition of the superconductor as a result of the fault current; and estimating the lifetime of the superconductor based on the change in the condition of the superconductor.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: September 1, 2015
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Kasegn D. Tekletsadik, Paul J. Murphy, Mark R. Amato, James D. Strassner
  • Publication number: 20150162742
    Abstract: In one embodiment a fault current limiter comprises a current splitting reactor having interleaved windings to reduce an insertion impedance of the fault current limiter during non-fault conditions. The current splitting reactor having interleaved windings may include a first winding, the first winding including a plurality of sub-windings and a second winding, the second winding including a plurality of sub-windings, the sub-windings of the first winding and the sub-windings of the second winding wounds about the core and interleaved.
    Type: Application
    Filed: December 10, 2013
    Publication date: June 11, 2015
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventor: Kasegn D. Tekletsadik
  • Patent number: 9008740
    Abstract: Techniques for protecting a superconducting (SC) article are disclosed. The techniques may be realized as an apparatus for protecting a superconducting (SC) article. The apparatus may comprise a porous sleeve configured to fit around the superconducting (SC) article. The porous sleeve may be made of non-conductive, dielectric material.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: April 14, 2015
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Gregory Citver, Semaan Fersan, Kasegn D. Tekletsadik, Scott Nickerson, Charles L. Stanley, Eric D. Hermanson
  • Publication number: 20150065351
    Abstract: In one embodiment a superconductor tape includes a substrate comprising a plurality of layers, an oriented superconductor layer disposed on the substrate, and an alloy coating disposed upon the superconductor layer, the alloy coating comprising one or more metallic layers in which at least one metallic layer comprises a metal alloy.
    Type: Application
    Filed: August 29, 2013
    Publication date: March 5, 2015
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Connie P. Wang, Paul Sullivan, Paul Murphy, Kasegn D. Tekletsadik, Bharatwaj Ramakrishnan
  • Publication number: 20150055260
    Abstract: A fault current limiter circuit including a fast switch fault current limiter (FSFCL) and a voltage control reactor (VCR) operative to conduct load current during a steady state operation and limit load current when the load current exceeds fault current limits. The FSFCL may include a breaker having electrical contacts, a coil electrically coupled to the electrical breaker contacts, a plunger mechanically coupled to the electrical breaker contacts, a parallel voltage control (VCR), a transient overvoltage control circuit (TOCC), wherein when current greater than a threshold level flows through the coil, a magnetic field having strength to move the plunger is generated, the movement of the plunger operates to open the contacts in the breaker and transfer fault current to VCR and TOCC and limit the overall system fault current.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 26, 2015
    Inventors: Kasegn D. Tekletsadik, Charles L. Stanley
  • Publication number: 20150055263
    Abstract: A solid-state fault current limiter including a current splitting reactor, comprising a system current input, a passive current output and a control current output. A voltage control reactor includes a first end and a second end, the first end coupled to the control current output and the second end coupled to the passive current output. A fault current trigger circuit coupled in parallel with the voltage control reactor and configured to open when a fault current, received by the system current input, exceeds a predefined trigger current. A transient voltage control circuit coupled in parallel with the voltage control reactor to receive the fault current.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 26, 2015
    Inventors: Kasegn D. Tekletsadik, Charles L. Stanley, Semaan Fersan, Piotr Lubicki
  • Patent number: 8862193
    Abstract: A connector assembly of a superconducting fault current limiter includes a first superconducting tape element, an electrical connector electrically coupled to the first superconducting element at a first region of the electrical conductor, and a second superconducting tape element electrically coupled to the electrical connector in a second region of the electrical connector. The electrical connector comprises a unitary structure. The first superconducting tape element, the electrical connector, and the second superconducting tape element comprise may comprise a layer.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: October 14, 2014
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventor: Kasegn D. Tekletsadik
  • Publication number: 20140262492
    Abstract: An electrical bushing is disclosed for use in high voltage cryogenic applications. The bushing including first and second bushing portions and an electrical conductor disposed longitudinally within the portions. The electrical conductor has a first terminal extending from the first bushing portion and a second terminal extending from the second bushing portion. The first terminal is configured to couple to a first electrical element at ambient temperature, and the second terminal is configured to couple to a second electrical element at cryogenic temperature. The first and second bushing portions comprise a base insulator material, while the first bushing portion further comprises an environmental protection layer disposed over the base insulator portion.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Kasegn D. Tekletsadik, Charles Stanley, Semaan Fersan, Nicholas A. Venuto, Scott Nickerson
  • Patent number: 8804288
    Abstract: New techniques for limiting transmission of fault current are disclosed. In one particular exemplary embodiment, the technique may be realized with a new type of apparatus for limiting transmission of fault current. The apparatus may comprise: a first enclosure electrically decoupled from ground, such that the first enclosure is electrically isolated from ground potential; first and second terminals, at least one of which is electrically connected to first one or more current carrying lines; and a first superconducting circuit contained in the first enclosure, the first superconducting circuit electrically connected to the first and second terminals, wherein the first enclosure is maintained at same electrical potential as the first one or more current carrying lines.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 12, 2014
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Kasegn D. Tekletsadik, Roger B. Fish, Paul J. Murphy
  • Patent number: 8700109
    Abstract: Techniques for improving reliability of a superconducting fault current limiting system (SCFCL) are provided. In one particular exemplary embodiment, the techniques may be realized with a superconducting fault current limiting system (SCFCL) comprising: an input current lead and an output current lead, each current lead coupled to a power distribution/transmission network; a container; a superconductor contained in the container; a shunt disposed outside the container and in parallel with the superconductor; a cryogenic system configured to provide coolant into the container; and at least one sensor disposed near and configured to monitor at least one operating condition of at least one of the input current lead and the output current lead, the superconductor, and the shunt.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: April 15, 2014
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Mark R. Amato, Paul J. Murphy, Kasegn D. Tekletsadik
  • Publication number: 20130225414
    Abstract: Techniques for improving reliability of a superconducting fault current limiting system (SCFCL) are provided. In one particular exemplary embodiment, the techniques may be realized with a superconducting fault current limiting system (SCFCL) comprising: an input current lead and an output current lead, each current lead coupled to a power distribution/transmission network; a container; a superconductor contained in the container; a shunt disposed outside the container and in parallel with the superconductor; a cryogenic system configured to provide coolant into the container; and at least one sensor disposed near and configured to monitor at least one operating condition of at least one of the input current lead and the output current lead, the superconductor, and the shunt.
    Type: Application
    Filed: June 11, 2012
    Publication date: August 29, 2013
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Mark R. Amato, Paul J. Murphy, Kasegn D. Tekletsadik
  • Publication number: 20130221979
    Abstract: Techniques for improving reliability of a superconducting fault current limiting system (SCFCL) are provided. In one particular exemplary embodiment, the technique may be realized as a method of improving a reliability of a superconducting fault current limiting system (SCFCL), the SCFCL system comprising a superconductor provided in a container. The method may comprise providing one or more sensors capable of detecting a fault current proximate to the superconductor; determining a change in the condition of the superconductor as a result of the fault current; and estimating the lifetime of the superconductor based on the change in the condition of the superconductor.
    Type: Application
    Filed: June 11, 2012
    Publication date: August 29, 2013
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCITES,INC.
    Inventors: Kasegn D. Tekletsadik, Paul J. Murphy, Mark R. Amato, James D. Strassner