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    REDUCING TRANSFORMER INRUSH CURRENT
    4.
    发明公开
    REDUCING TRANSFORMER INRUSH CURRENT 审中-公开

    公开(公告)号：US20230420933A1

    公开(公告)日：2023-12-28

    申请号：US18337920

    申请日：2023-06-20

    Applicant: ABB Schweiz AG

    Inventor： Elisabeth Lindell ,  Johan Nohlert ,  Stefan Halén ,  Jesper Magnusson

    IPC: H02H9/00 ,  H02H7/04 ,  H01H9/56

    CPC classification number: H02H9/002 ,  H02H7/04 ,  H01H9/56

    Abstract: A start-up method for reducing inrush current to a transformer when closing a switching device. The switching device includes three single-pole operated current interrupting means. The method includes monitoring a voltage. The method includes, for each of a sequence of iterations: at a same opening angle relative to a reference angle of the voltage, starting an opening sequence of the switching device; at a closing angle relative to the reference angle, which is shifted in relation to the closing angle of all other iterations in the sequence, starting a closing sequence of the switching device; and obtaining an indication of the overall inrush current resulting from the closing. The method includes selecting for future use with the opening angle, the closing angle of one of the iterations in which the overall inrush current is relatively low when compared with the other iterations of the sequence.

    Transformer power management controllers and transformer power management methods
    6.
    发明授权
    Transformer power management controllers and transformer power management methods 有权

    公开(公告)号：US11783996B2

    公开(公告)日：2023-10-10

    申请号：US16001465

    申请日：2018-06-06

    Applicant: Battelle Memorial Institute

    Inventor： Richard M. Pratt ,  Michael CW Kintner-Meyer

    IPC: H01F27/40 ,  H02H7/04 ,  H02P13/06 ,  G05F1/14

    CPC classification number: H01F27/402 ,  G05F1/14 ,  H02H7/04 ,  H02P13/06 ,  H01F2027/406

    Abstract: Transformer power management controllers and transformer power management methods are described. According to one aspect, a transformer power management controller includes processing circuitry configured to monitor an electrical characteristic of electrical energy which is received from a secondary of a transformer of an electric power system, use the monitored electrical characteristic to determine transformer loading information which is indicative of an amount of power which is being supplied by the secondary of the transformer to a plurality of loads which are coupled with the secondary of the transformer, and use the transformer loading information to adjust an amount of the electrical energy which is supplied by the secondary of the transformer to at least one of the loads which is coupled with the secondary of the transformer.

    Transformer internal fault reclose block
    7.
    发明授权
    Transformer internal fault reclose block 有权

    公开(公告)号：US11646564B2

    公开(公告)日：2023-05-09

    申请号：US17524348

    申请日：2021-11-11

    Applicant: S&C Electric Company

    Inventor： Thomas J. Tobin

    IPC: H02H3/06 ,  H02H7/04 ,  H02H1/00

    CPC classification number: H02H3/066 ,  H02H1/0007 ,  H02H7/04

    Abstract: A fault detection system that that prevents a recloser from reclosing if a fault is determined to be internal to a transformer, where the recloser is configured to perform a reclosing operation in response to detecting overcurrent. The recloser includes a sensor, such as a light sensor, directed towards the transformer and detecting a fault event. If the recloser detects overcurrent, but the sensor does not detect the fault event, it is assumed that the fault is internal to the transformer and the recloser is prevented from reclosing.

    Current transformer
    9.
    发明授权
    Current transformer 有权

    公开(公告)号：US11424584B2

    公开(公告)日：2022-08-23

    申请号：US16612247

    申请日：2018-04-23

    Applicant: GENERAL ELECTRIC TECHNOLOGY GMBH

    Inventor： Simon Kidd ,  Paul Aston

    IPC: H01R31/08 ,  G01R31/52 ,  H01R12/72 ,  H02H7/04 ,  H02H7/045

    Abstract: A current transformer connector (10; 102) for connecting a current transformer of an electrical network to a protection relay via a current transformer data acquisition board (12; 104), is provided. The current transformer connector (10; 102) comprises first and second pairs (14, 20) of first and second current contacts (16, 18, 22, 24), each current contact pair (14, 20) being connectable in use to the current transformer so as to permit current flow from the electrical network through the current contact pairs (14, 20) to the protection relay. Each current contact pair (14, 20) is arranged to be in a short circuit configuration. The first current contact (16, 22) in each current contact pair (14, 20) is arranged to be independently moveable relative to the corresponding second current contact (18, 24) so that during initial insertion of the current transformer data acquisition board (12; 104) into the current transformer connector (10; 102) in use the first current contact (16) of the first current contact pair (14) is configured to separate from the second current contact (18) of the first current contact pair (14) to permit breaking of the short circuit configuration of the first current contact pair (14) and making of an electrical connection between the first current contact pair (14) and the current transformer data acquisition board (12; 104), while the second current contact pair (20) remains in the short circuit configuration. The first current contact (16, 22) in each current contact pair (14, 20) is further arranged to be independently moveable relative to the corresponding second current contact (18, 24) so that during further insertion of the current transformer data acquisition board (12; 104) into the current transformer connector (10; 102) in use the first current contact (22) of the second current contact pair (20) is configured to separate from the second current contact (24) of the second current contact pair (20) to permit breaking of the short circuit configuration of the second current contact pair (20).

    PROTECTION OF LOW-VOLTAGE DISTRIBUTION NETWORKS
    10.
    发明申请
    PROTECTION OF LOW-VOLTAGE DISTRIBUTION NETWORKS 有权

    公开(公告)号：US20220236339A1

    公开(公告)日：2022-07-28

    申请号：US17721893

    申请日：2022-04-15

    Applicant: Mahdi Davarpanah ,  Ahmadreza Darabi ,  Pooria Allah Karami ,  Hamed Morsali

    Inventor： Mahdi Davarpanah ,  Ahmadreza Darabi ,  Pooria Allah Karami ,  Hamed Morsali

    IPC: G01R31/62 ,  H02H7/04 ,  H02H3/16 ,  H02H3/34

    Abstract: A method for protecting a low-voltage distribution network. The low-voltage distribution network includes a low-voltage side of a three-phase distribution transformer that is configured to supply electrical power to at least one single-phase load through a respective distribution line of a plurality of three-phase distribution lines distribution lines. The method includes measuring variations of a periodic neutral-to-ground voltage between a neutral terminal of the three-phase distribution transformer and a local ground node by sampling the variations at a sampling frequency, detecting a fault in the low-voltage power distribution network based on the variations of the periodic neutral-to-ground voltage, and disconnecting the low-voltage side from the low-voltage power distribution network responsive to the fault being detected.

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