Transient Behavior of Large Transformer Windings Taking Capacitances and Eddy Currents Into Account

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Transformer windings, as resonant systems, respond to impulse excitation by oscillating voltages and currents. In this paper, a detailed transient circuit analysis of an auto-transformer exposed to a full and a chopped standard lightning impulse has been performed, taking into account each single turn of the two windings. The corresponding inductance and capacitance matrices used in the circuit analysis are obtained by finite-element method (FEM)-calculations. To get the resistances of the turns, eddy currents have to be considered. Since the turns (continuously transposed conductors) consist of a certain number of single strands to keep the eddy current losses low, an appropriate eddy current calculation by FEM has to be performed, taking account of each single strand of the turns. The resulting resistances of the turns are typically several hundred times higher than the respective dc resistances. This has a significant influence on the damping behavior of the high-frequency oscillations of the system.

Spracheenglisch
Aufsatznummer7203904
Seitenumfang4
FachzeitschriftIEEE Transactions on Magnetics
Jahrgang54
Ausgabennummer3
DOIs
StatusVeröffentlicht - 2018

Fingerprint

Transformer windings
Eddy currents
Capacitance
Electric network analysis
Finite element method
Lightning
Inductance
Damping
Electric potential

Schlagwörter

    ASJC Scopus subject areas

    • !!Electronic, Optical and Magnetic Materials
    • !!Electrical and Electronic Engineering

    Fields of Expertise

    • Information, Communication & Computing

    Dies zitieren

    Transient Behavior of Large Transformer Windings Taking Capacitances and Eddy Currents Into Account. / Preis, Kurt; Renhart, Werner; Rabel, Alexander; Biro, Oszkar.

    in: IEEE Transactions on Magnetics, Jahrgang 54, Nr. 3, 7203904, 2018.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    @article{2d7eeb3340e543f9b72cc97b4de4cda8,
    title = "Transient Behavior of Large Transformer Windings Taking Capacitances and Eddy Currents Into Account",
    abstract = "Transformer windings, as resonant systems, respond to impulse excitation by oscillating voltages and currents. In this paper, a detailed transient circuit analysis of an auto-transformer exposed to a full and a chopped standard lightning impulse has been performed, taking into account each single turn of the two windings. The corresponding inductance and capacitance matrices used in the circuit analysis are obtained by finite-element method (FEM)-calculations. To get the resistances of the turns, eddy currents have to be considered. Since the turns (continuously transposed conductors) consist of a certain number of single strands to keep the eddy current losses low, an appropriate eddy current calculation by FEM has to be performed, taking account of each single strand of the turns. The resulting resistances of the turns are typically several hundred times higher than the respective dc resistances. This has a significant influence on the damping behavior of the high-frequency oscillations of the system.",
    keywords = "Capacitance, Continuous transposed conductors, Eddy currents, eddy currents, Integrated circuit modeling, Mathematical model, Standards, transformer windings, Transient analysis, transient behaviour, Windings",
    author = "Kurt Preis and Werner Renhart and Alexander Rabel and Oszkar Biro",
    year = "2018",
    doi = "10.1109/TMAG.2017.2766761",
    language = "English",
    volume = "54",
    journal = "IEEE Transactions on Magnetics",
    issn = "0018-9464",
    publisher = "Institute of Electrical and Electronics Engineers",
    number = "3",

    }

    TY - JOUR

    T1 - Transient Behavior of Large Transformer Windings Taking Capacitances and Eddy Currents Into Account

    AU - Preis, Kurt

    AU - Renhart, Werner

    AU - Rabel, Alexander

    AU - Biro, Oszkar

    PY - 2018

    Y1 - 2018

    N2 - Transformer windings, as resonant systems, respond to impulse excitation by oscillating voltages and currents. In this paper, a detailed transient circuit analysis of an auto-transformer exposed to a full and a chopped standard lightning impulse has been performed, taking into account each single turn of the two windings. The corresponding inductance and capacitance matrices used in the circuit analysis are obtained by finite-element method (FEM)-calculations. To get the resistances of the turns, eddy currents have to be considered. Since the turns (continuously transposed conductors) consist of a certain number of single strands to keep the eddy current losses low, an appropriate eddy current calculation by FEM has to be performed, taking account of each single strand of the turns. The resulting resistances of the turns are typically several hundred times higher than the respective dc resistances. This has a significant influence on the damping behavior of the high-frequency oscillations of the system.

    AB - Transformer windings, as resonant systems, respond to impulse excitation by oscillating voltages and currents. In this paper, a detailed transient circuit analysis of an auto-transformer exposed to a full and a chopped standard lightning impulse has been performed, taking into account each single turn of the two windings. The corresponding inductance and capacitance matrices used in the circuit analysis are obtained by finite-element method (FEM)-calculations. To get the resistances of the turns, eddy currents have to be considered. Since the turns (continuously transposed conductors) consist of a certain number of single strands to keep the eddy current losses low, an appropriate eddy current calculation by FEM has to be performed, taking account of each single strand of the turns. The resulting resistances of the turns are typically several hundred times higher than the respective dc resistances. This has a significant influence on the damping behavior of the high-frequency oscillations of the system.

    KW - Capacitance

    KW - Continuous transposed conductors

    KW - Eddy currents

    KW - eddy currents

    KW - Integrated circuit modeling

    KW - Mathematical model

    KW - Standards

    KW - transformer windings

    KW - Transient analysis

    KW - transient behaviour

    KW - Windings

    UR - http://www.scopus.com/inward/record.url?scp=85038373075&partnerID=8YFLogxK

    U2 - 10.1109/TMAG.2017.2766761

    DO - 10.1109/TMAG.2017.2766761

    M3 - Article

    VL - 54

    JO - IEEE Transactions on Magnetics

    T2 - IEEE Transactions on Magnetics

    JF - IEEE Transactions on Magnetics

    SN - 0018-9464

    IS - 3

    M1 - 7203904

    ER -