### 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.

Sprache | englisch |
---|---|

Aufsatznummer | 7203904 |

Seitenumfang | 4 |

Fachzeitschrift | IEEE Transactions on Magnetics |

Jahrgang | 54 |

Ausgabennummer | 3 |

DOIs | |

Status | Veröffentlicht - 2018 |

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### 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.

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Forschung › Begutachtung

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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 -