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    Multi-terminal surge arrester
    2.
    发明授权
    Multi-terminal surge arrester 有权

    公开(公告)号：US09824800B2

    公开(公告)日：2017-11-21

    申请号：US14945918

    申请日：2015-11-19

    Applicant: ABB Schweiz AG

    Inventor： Bernhard Doser ,  Peter Dubach ,  Felix Greuter ,  Elisabeth Lindell ,  Lars Liljestrand

    IPC: H01C7/10 ,  H01C7/12 ,  H01C1/02

    CPC classification number: H01C7/12 ,  H01C1/02

    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.

    System for protection of dry type transformers
    6.
    发明授权
    System for protection of dry type transformers 有权

    公开(公告)号：US09882373B2

    公开(公告)日：2018-01-30

    申请号：US14550394

    申请日：2014-11-21

    Applicant: ABB Schweiz AG

    Inventor： Elisabeth Lindell ,  Lars Liljestrand ,  Felix Greuter

    IPC: H02H9/04 ,  H02H9/00 ,  H01F27/34 ,  H01F27/40

    CPC classification number: H02H9/005 ,  H01F27/343 ,  H01F27/40 ,  H02H9/04

    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.

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