公开(公告)号：US12113449B2

公开(公告)日：2024-10-08

申请号：US18553045

申请日：2022-03-30

Applicant: HITACHI ENERGY LTD

Inventor： Panagiotis Bakas ,  Roberto Alves ,  Jan Svensson

IPC: H02M5/257 ,  H02M1/34

CPC classification number: H02M5/257 ,  H02M1/348

Abstract: A transformer arrangement comprising a transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load. The transformer arrangement further comprises an AC-AC PE converter connected to a thyristor used for bypassing the AC-AC PE converter in case of a short-circuit fault in a terminal of the primary side and/or the secondary side. The transformer arrangement further comprises a thyristor-based AC-AC PE converter connected to a thyristor-tapped winding. The AC-AC PE converter is connected with the thyristor-tapped winding via the thyristor-based AC-AC PE converter. The thyristor-based AC-AC PE converter is connected to an impedance to protect the thyristor-tapped winding from short-circuit faults of the thyristor-based AC-AC PE converter.

公开(公告)号：US12068290B2

公开(公告)日：2024-08-20

申请号：US17611305

申请日：2020-04-02

Applicant: Hitachi Energy Ltd

Inventor： Arne Schroeder ,  Slavo Kicin ,  Fabian Mohn ,  Juergen Schuderer

IPC: H01L25/07 ,  H01L23/00 ,  H01L23/373 ,  H01L23/538

CPC classification number: H01L25/072 ,  H01L23/3735 ,  H01L23/5385 ,  H01L23/5386 ,  H01L24/32 ,  H01L24/49 ,  H01L2224/48091 ,  H01L2224/49111 ,  H01L2224/73265 ,  H01L2924/19107

Abstract: A power semiconductor module includes a main substrate and power semiconductor chips. Each power semiconductor chip is bonded to the main conductive layer with the first power electrode. A first group of the power semiconductor chips is connected in parallel via the second power electrodes and a second group of the power semiconductor chips is connected in parallel via the second power electrodes. The module also includes a first insulation layer and a first conductive layer overlying the first insulation layer as well as a second insulation layer and a second conductive layer overlying the second insulation layer. The first conductive layer provides a first gate conductor area and a first auxiliary emitter conductor area for the first group. The second conductive layer provides a second gate conductor area and a second auxiliary emitter conductor area for the second group.

公开(公告)号：US20240274349A1

公开(公告)日：2024-08-15

申请号：US18034986

申请日：2022-02-11

Applicant: Hitachi Energy Ltd

Inventor： Kiran Chandra Sahu ,  Anders Daneryd

IPC: H01F27/33 ,  H01F27/02 ,  H01F27/28

CPC classification number: H01F27/33 ,  H01F27/306 ,  H01F27/321

Abstract: A transformer comprising at least two phase windings, each phase winding having coil turns around a coil axis, wherein the at least two phase windings comprise at least a first type of phase winding and a second type of phase winding, each of the first type of phase winding and the second type of phase winding comprising a plurality of winding portions comprising at least a first winding portion and a second winding portion, the first type of phase winding comprising a first winding portion having a first winding portion stiffness and a second winding portion having a second winding portion stiffness, and characterized in that a stiffness difference between said first winding portion stiffness and said second winding portion stiffness of said first type of phase winding is such that the acoustic power is minimized at said main frequency.

公开(公告)号：US12061243B2

公开(公告)日：2024-08-13

申请号：US18198189

申请日：2023-05-16

Applicant: Hitachi Energy Ltd

Inventor： Marco Giuntoli ,  Giancarlo Dalle Ave ,  Kevin Schoenleber ,  Robert Juhlin ,  Susanne Schmitt

IPC: G01R31/52 ,  G01R31/58 ,  H02J3/36 ,  H02J13/00

CPC classification number: G01R31/58 ,  G01R31/52 ,  H02J3/36 ,  H02J13/00001 ,  H02J2003/365 ,  H02J2203/20

Abstract: The present disclosure relates to a method and system for evaluating a grid condition of an AC power grid. A time series of voltage and current signals of the AC power grid is captured and a local frequency of the AC power grid is identified. The time series of the voltage and current signals is transformed at the identified local frequency of the AC power grid into transformed signals. Equivalent circuit parameters are estimated from the transformed signals based on a description of an equivalent circuit of the AC power grid. A value of a grid condition indicator is determined based on the calculated equivalent circuit parameters and the identified local frequency of the AC power grid and processed in a grid monitoring system for evaluating the grid condition of the AC power grid.

公开(公告)号：US20240255550A1

公开(公告)日：2024-08-01

申请号：US18561204

申请日：2021-05-17

Applicant: HITACHI ENERGY LTD

Inventor： Elisabeth Lindell ,  Stefan Halen

IPC: G01R19/165 ,  H02H9/04

CPC classification number: G01R19/16571 ,  H02H9/04

Abstract: A monitoring arrangement for monitoring a surge through a surge arrester, the surge arrester being adapted to be connected to a power network in order to protect an electrical equipment of the power network against incoming surges passing through the surge arrester. The monitoring arrangement detects a reignition surge, which reignition surge has been occasioned by a switching of a circuit breaker. The monitoring arrangement further calculates the number of detected reignition surges.

公开(公告)号：USD1036400S1

公开(公告)日：2024-07-23

申请号：US29777081

申请日：2021-04-02

Applicant: Hitachi Energy Ltd

Designer： Samuel Brodeur ,  Mattias Viksten ,  Glenn Stromberg ,  Joakim Johansson ,  Axel Bergman

Abstract: FIG. 1 is a rear view of a reinforced external turret for electrical equipment showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is an oblique view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines and the portions within illustrate portions of the article that form no part of the claimed design.

公开(公告)号：US12046423B2

公开(公告)日：2024-07-23

申请号：US15734436

申请日：2019-05-29

Applicant: HITACHI ENERGY LTD

Inventor： Cecilia Forssen ,  Harald Martini ,  Joachim Schiessling ,  Nils Lavesson ,  Peter Dyreklev ,  Mats Sandberg

IPC: H01G4/32 ,  H01B17/28 ,  H01B17/42 ,  H02G15/072

CPC classification number: H01G4/32 ,  H01B17/28 ,  H01B17/42 ,  H02G15/072

Abstract: The present disclosure relates to a wound electrical component comprising a wound body comprising a plurality of wound layers of a web of an electrically insulating material around a longitudinal axis of the body. The wound body comprises a plurality of electrically conducting layers of an electrically conducting material, each printed onto a respective separate area of the web in the wound body. An edge zone of at least one of the plurality of electrically conducting layers is connected to a printed high permittivity layer of a high permittivity material along said edge zone such that at least a part of the high permittivity layer extends, printed on the web, beyond the edge zone.

公开(公告)号：US20240235406A1

公开(公告)日：2024-07-11

申请号：US18559115

申请日：2022-05-06

Applicant: Hitachi Energy Ltd

Inventor： Daniel Siemaszko ,  Martin Klaeusler ,  Raul Ruiz

IPC: H02M3/335 ,  H02M1/38

CPC classification number: H02M3/33584 ,  H02M1/38

Abstract: The present disclosure relates to a method for power control of a power converter including controlling, with a first signal having a first duty cycle D1, a first active switching component in a switching unit of at least one branch; controlling, with a second signal having a second duty cycle D2, a second active switching component of the switching unit; determining a polarity of a monitored current through at least one inductive component coupled to the at least one branch; and adjusting the first duty cycle D1 and the second duty cycle D2 based on the determined polarity. The present disclosure also relates to a respective controller and system.

公开(公告)号：US20240222051A1

公开(公告)日：2024-07-04

申请号：US18288666

申请日：2022-04-22

Applicant: Hitachi Energy Ltd

Inventor： Lennart MERKERT ,  Tim SCHULZE-KOENIG ,  Huiry-Yuan ZHOU ,  MinZhong YANG

IPC: H01H33/56 ,  H01H11/00 ,  H02B13/065

CPC classification number: H01H33/563 ,  H01H11/0062 ,  H02B13/0655

Abstract: A gas monitoring system includes



a gas-insulated switchgear including a chamber filled with an insulating gas surrounding a high or medium voltage component,
a sensor operatively connected to the chamber and adapted to measure a physical property of the insulating gas in the chamber over time, and
a computer unit adapted to perform on the sensor measurements a statistical step detection for determining if a jump has occurred and/or a statistical change detection for determining if a change has occurred, whereby
the statistical step and/or change detection includes identifying an expected range based on past sensor measurements and checking if a current sensor measurement is outside of the expected range.

公开(公告)号：US12028001B2

公开(公告)日：2024-07-02

申请号：US16848130

申请日：2020-04-14

Applicant: Hitachi Energy Ltd

Inventor： Ion C. Radu

IPC: H01F29/02 ,  H01F3/06 ,  H02P13/10

CPC classification number: H02P13/10 ,  H01F3/06 ,  H01F29/02

Abstract: An apparatus having a first set of windings disposed about a first main leg of a transformer core, and a second set of windings disposed about a second main leg of the transformer core. The first set of windings are electrically coupled to the second set of windings to selectively provide a parallel connection and a series connection between the first set of windings and the second set of windings. Additionally, at least two windings of the first set of windings are electrically coupled to each other to selectively provide a parallel connection and a serial connection between the at least two windings of the first set of windings. Similarly, two windings of the second set of windings are electrically coupled to each other to selectively provide a parallel connection and a serial connection between the at least two windings of the second set of windings.