Patents by Inventor Lars Liljestrand

Lars Liljestrand 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).

  • Publication number: 20200266008
    Abstract: The present invention relates to a method for controlling a motor-driven vacuum circuit breaker. The method comprises initiate opening (S100) the circuit breaker, wherein the circuit breaker moves with an average opening speed of a contact pair of the circuit breaker, from a closed position to an open position of the circuit breaker, and decelerating (S110) the opening speed of the contact pair to below the average opening speed before the open position is reached to avoid overshoot, and initiate closing (S120) the circuit breaker, wherein the circuit breaker moves with an average closing speed of the contact pair, from the open position to the closed position, and decelerating (S130) the closing speed of the contact pair to below the average closing speed before contact touch at the closed position, wherein the circuit breaker moves with the decelerated speed at contact touch. A motor-driven vacuum circuit breaker, a computer program and a computer program product are also presented.
    Type: Application
    Filed: June 20, 2018
    Publication date: August 20, 2020
    Inventors: Elisabeth Lindell, Andrea Bianco, Andrea Ricci, Lars Jonsson, Stefan Halén, Lars Liljestrand
  • Patent number: 10622170
    Abstract: A method for controlling a circuit breaker, the circuit breaker is connected in a three-phase system having an inductive load, and the method includes a method for controlling a circuit breaker, the circuit breaker being connected in a three-phase system having an inductive load, the method includes opening a first phase of the three-phase system before a zero crossing of a current in the first phase, opening the second and third phases of the three-phase system a quarter period after opening the first phase, closing the first and second phase at a peak voltage of a voltage between the first and second phases, and closing the third phase a quarter period after closing the first and second phases. A circuit breaker controller is also presented.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: April 14, 2020
    Assignee: ABB Schweiz AG
    Inventors: Elisabeth Lindell, Lars Liljestrand, Stefan Halén
  • Publication number: 20190371542
    Abstract: A method for controlling a circuit breaker, the circuit breaker is connected in a three-phase system having an inductive load, and the method includes a method for controlling a circuit breaker, the circuit breaker being connected in a three-phase system having an inductive load, the method includes opening a first phase of the three-phase system before a zero crossing of a current in the first phase, opening the second and third phases of the three-phase system a quarter period after opening the first phase, closing the first and second phase at a peak voltage of a voltage between the first and second phases, and closing the third phase a quarter period after closing the first and second phases. A circuit breaker controller is also presented.
    Type: Application
    Filed: January 29, 2018
    Publication date: December 5, 2019
    Applicant: ABB Schweiz AG
    Inventors: Elisabeth Lindell, Lars Liljestrand, Stefan Halén
  • Patent number: 10242826
    Abstract: An electric power distribution switchgear is connected between an electric power grid and an electric power equipment. The switchgear includes a synchronized vacuum switching apparatus configured to break the current to the electric power equipment using a synchronized technique to avoid re-ignition during the breaking and thus any transients caused by such re-ignition; and a surge arrester arrangement connected to the electric power equipment, the surge arrester arrangement being designed and configured to only handle transients caused by the current chopping at the breaking. The surge arrester arrangement can be arranged remote from the electric power equipment, such as e.g. in the same casing as the synchronized vacuum switching apparatus.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: March 26, 2019
    Assignee: ABB Schweiz AG
    Inventors: Elisabeth Lindell, Lars Liljestrand, Stefan Halén
  • Patent number: 10177557
    Abstract: A passive electronic fuse for protecting a DC application in the event of a fault includes a first leg including a first winding of a mutual inductor and a switch device connected in series, a second leg including a second winding of the mutual inductor. The first leg and the second leg are connected in parallel and a self-inductance of the second winding is lower than a self-inductance of the first winding. The second leg further includes a capacitor connected in series with the second winding of the mutual inductor, and the switch device is a thyristor or a switch device with switching properties of a thyristor.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: January 8, 2019
    Assignee: ABB SCHWEIZ AG
    Inventors: Robert Saers, Lars Liljestrand, Tomas Tengner, Jesper Magnusson
  • Publication number: 20180226213
    Abstract: An electric power distribution switchgear is connected between an electric power grid and an electric power equipment. The switchgear includes a synchronized vacuum switching apparatus configured to break the current to the electric power equipment using a synchronized technique to avoid re-ignition during the breaking and thus any transients caused by such re-ignition; and a surge arrester arrangement connected to the electric power equipment, the surge arrester arrangement being designed and configured to only handle transients caused by the current chopping at the breaking. The surge arrester arrangement can be arranged remote from the electric power equipment, such as e.g. in the same casing as the synchronized vacuum switching apparatus.
    Type: Application
    Filed: June 17, 2016
    Publication date: August 9, 2018
    Inventors: Elisabeth LINDELL, Lars LILJESTRAND, Stefan HALÉN
  • Publication number: 20180183229
    Abstract: A passive electronic fuse for protecting a DC application in the event of a fault includes a first leg including a first winding of a mutual inductor and a switch device connected in series, a second leg including a second winding of the mutual inductor. The first leg and the second leg are connected in parallel and a self-inductance of the second winding is lower than a self-inductance of the first winding. The second leg further includes a capacitor connected in series with the second winding of the mutual inductor, and the switch device is a thyristor or a switch device with switching properties of a thyristor.
    Type: Application
    Filed: June 12, 2015
    Publication date: June 28, 2018
    Applicant: ABB SCHWEIZ AG
    Inventors: Robert SAERS, Lars LILJESTRAND, Tomas TENGNER, Jesper MAGNUSSON
  • Patent number: 9953760
    Abstract: A transformer arrangement and transformer for mitigating transient voltage oscillations. The transformer included a transformer core enclosing at least one core leg. A winding is wound around one of the at least one core leg. The winding extends from a first winding terminal to a second winding terminal and includes a first winding section along a first conductor extending from the first winding terminal to a first intermediate end point, and a second winding section along a second conductor extending from a second intermediate end point to the second winding terminal. The transformer arrangement further includes an external passive electric component connected between the first intermediate end point and either the second intermediate end point or the second winding terminal arranged to decrease an effective difference between capacitive and inductive voltage distributions between the intermediate end points such that transient voltage oscillations in the winding are mitigated.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: April 24, 2018
    Assignee: ABB Research Ltd.
    Inventors: Dierk Bormann, Lars Liljestrand, Martin Carlen, Thorsten Steinmetz, Philipp Buttgenbach, Jens Tepper
  • Patent number: 9882373
    Abstract: A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the two surge arresters is electrically connected to a middle location of the winding. Three additional surge arresters are electrically connected from each phase to ground in the case of either a delta or Y connected transformer; and/or connected from a neutral point to ground in the case of a Y connected transformer. The system allows for all of the surge arresters to be packaged as an integrated surge arrester system to minimize induced transient over voltages and high stresses on the transformer winding due to internal resonances.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: January 30, 2018
    Assignee: ABB Schweiz AG
    Inventors: Elisabeth Lindell, Lars Liljestrand, Felix Greuter
  • Patent number: 9824800
    Abstract: A multi-terminal surge arrester which includes an active part extending along a longitudinal direction of the surge arrester, a first electrode resting against a first end of the active part, and a second electrode resting against a second end of the active part, which second end opposes the first end in the longitudinal direction of the surge arrester. The surge arrester further includes an insulating fixing device mechanically connecting and fixing the first electrode and the second electrode, and an insulating housing arranged around the active part. The active part includes at least two metal-oxide based varistor elements and a further electrode arranged between the at least two varistor elements, which further electrode provides an externally accessible electrical connection. Therein, the surge arrester is adapted for being insulated by surrounding air.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: November 21, 2017
    Assignee: ABB Schweiz AG
    Inventors: Bernhard Doser, Peter Dubach, Felix Greuter, Elisabeth Lindell, Lars Liljestrand
  • Publication number: 20160189858
    Abstract: A transformer arrangement and transformer for mitigating transient voltage oscillations. The transformer included a transformer core enclosing at least one core leg. A winding is wound around one of the at least one core leg. The winding extends from a first winding terminal to a second winding terminal and includes a first winding section along a first conductor extending from the first winding terminal to a first intermediate end point, and a second winding section along a second conductor extending from a second intermediate end point to the second winding terminal. The transformer arrangement further includes an external passive electric component connected between the first intermediate end point and either the second intermediate end point or the second winding terminal arranged to decrease an effective difference between capacitive and inductive voltage distributions between the intermediate end points such that transient voltage oscillations in the winding are mitigated.
    Type: Application
    Filed: November 19, 2013
    Publication date: June 30, 2016
    Inventors: Dierk Bormann, Lars Liljestrand, Martin Carlen, Thorsten Steinmetz, Philipp Buttgebach, Jens Tepper
  • Publication number: 20160148728
    Abstract: A multi-terminal surge arrester which includes an active part extending along a longitudinal direction of the surge arrester, a first electrode resting against a first end of the active part, and a second electrode resting against a second end of the active part, which second end opposes the first end in the longitudinal direction of the surge arrester. The surge arrester further includes an insulating fixing device mechanically connecting and fixing the first electrode and the second electrode, and an insulating housing arranged around the active part. The active part includes at least two metal-oxide based varistor elements and a further electrode arranged between the at least two varistor elements, which further electrode provides an externally accessible electrical connection. Therein, the surge arrester is adapted for being insulated by surrounding air.
    Type: Application
    Filed: November 19, 2015
    Publication date: May 26, 2016
    Inventors: Bernhard Doser, Peter Dubach, Felix Greuter, Elisabeth Lindell, Lars Liljestrand
  • Publication number: 20160149396
    Abstract: A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the two surge arresters is electrically connected to a middle location of the winding. Three additional surge arresters are electrically connected from each phase to ground in the case of either a delta or Y connected transformer; and/or connected from a neutral point to ground in the case of a Y connected transformer. The system allows for all of the surge arresters to be packaged as an integrated surge arrester system to minimize induced transient over voltages and high stresses on the transformer winding due to internal resonances.
    Type: Application
    Filed: November 21, 2014
    Publication date: May 26, 2016
    Inventors: Elisabeth Lindell, Lars Liljestrand, Felix Greuter
  • Patent number: 9148011
    Abstract: An apparatus is arranged to break an electrical current. The apparatus includes: a mechanical switch leg including a first winding of a mutual inductor and a mechanical switch connected in series; a semiconductor switch leg including a second winding of the mutual inductor and a semiconductor switch connected in series; and an overvoltage protection circuit. The mechanical switch leg and the semiconductor switch leg are connected in parallel and a self inductance of the second winding is lower than a self inductance of the first winding. A corresponding DC circuit breaker and AC current limiter are also presented.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: September 29, 2015
    Assignee: ABB TECHNOLOGY LTD
    Inventors: Jesper Magnusson, Lars Liljestrand, Robert Saers
  • Publication number: 20150222111
    Abstract: An apparatus is arranged to break an electrical current. The apparatus includes: a mechanical switch leg including a first winding of a mutual inductor and a mechanical switch connected in series; a semiconductor switch leg including a second winding of the mutual inductor and a semiconductor switch connected in series; and an overvoltage protection circuit. The mechanical switch leg and the semiconductor switch leg are connected in parallel and a self inductance of the second winding is lower than a self inductance of the first winding. A corresponding DC circuit breaker and AC current limiter are also presented.
    Type: Application
    Filed: August 27, 2012
    Publication date: August 6, 2015
    Applicant: ABB TECHNOLOGY LTD
    Inventors: Jesper Magnusson, Lars Liljestrand, Robert Saers
  • Patent number: 9035212
    Abstract: An exemplary medium or high voltage switch has a first set of contact elements and a second set of contact elements. Each contact element includes an insulating carrier carrying conducting elements. In the closed state of the switch, the conducting elements align to form one or more current paths between terminals of the switch along an axial direction. For opening the switch, the contact elements are mutually displaced by means of one or two drives along a direction perpendicular to the axial direction. The switching arrangement is arranged in a fluid-tight housing in a gas of elevated pressure or in a liquid. The switch has a high voltage withstand capability and fast switching times.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: May 19, 2015
    Assignee: ABB TECHNOLOGY AG
    Inventors: Lars Liljestrand, Lars E. Jonsson, Per Skarby, Per Lindholm, Ueli Steiger
  • Patent number: 8837093
    Abstract: A DC current path for DC power transmission includes at least a first switching element and a second switching element connected in series. A resonance circuit is configured to be connectable in parallel to the series connection of the at least one first switching element and second switching element by means of a switch.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: September 16, 2014
    Assignee: ABB Technology AG
    Inventors: Emmanouil Panousis, Jadran Kostovic, Lars Liljestrand, Markus Bujotzek, Per Skarby
  • Patent number: 8797128
    Abstract: An exemplary medium or high voltage switch has a first set of contact elements and a second set of contact elements. Each contact element includes an insulating carrier carrying conducting elements. In the closed current-carrying state of the switch, the conducting elements align to form one or more current paths between terminals of the switch along an axial direction. For opening the switch, the contact elements are mutually displaced by through two drives along a direction perpendicular to the axial direction. The switching arrangement is arranged in a fluid-tight housing in a gas of elevated pressure or in a liquid. The switch has a high voltage withstand capability and fast switching times.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: August 5, 2014
    Assignee: ABB Technology AG
    Inventors: Lars Liljestrand, Lars E. Jonsson, Per Skarby, Ryan Chladny
  • Patent number: 8569909
    Abstract: An arrangement to control an electrical property of a medium or high voltage AC system including a number n of phases with n being at least two includes a number n of phases, each phase including a series connection of at least two electrical elements with an intermediate connection point between each pair of the at least two electrical elements, where each of the n phases of the arrangement is connected on one side to an original common neutral point and on the other side to one of the n phases of the AC system. The arrangement further includes a number of first switchable interconnections, where the first switchable interconnections are each arranged between two intermediate connection points of two of the n phases of the arrangement, and at least one control unit arranged to control the first switchable interconnections.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: October 29, 2013
    Assignee: ABB Research Ltd.
    Inventors: Stefan Thorburn, Lars Liljestrand, Ake Petersson
  • Publication number: 20130098874
    Abstract: An exemplary medium or high voltage switch has a first set of contact elements and a second set of contact elements. Each contact element includes an insulating carrier carrying conducting elements. In the closed state of the switch, the conducting elements align to form one or more current paths between terminals of the switch along an axial direction. For opening the switch, the contact elements are mutually displaced by means of one or two drives along a direction perpendicular to the axial direction. The switching arrangement is arranged in a fluid-tight housing in a gas of elevated pressure or in a liquid. The switch has a high voltage withstand capability and fast switching times.
    Type: Application
    Filed: April 11, 2012
    Publication date: April 25, 2013
    Applicant: ABB Technology AG
    Inventors: Lars LILJESTRAND, Lars E. Jonsson, Per Skarby, Per Lindholm, Ueli Steiger