Transient Behaviour of Large Transformer Windings Taking Capacitances and Eddy Currents into Account

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

Transformer windings, as oscillatory systems, respond to impulse excitation by starting to oscillate. In the paper, a detailed transient circuit analysis of an auto-transformer responding to a standard lightning impulse (LI) 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 FEM-calculations. To get the resistances of the turns, eddy currents have to considered. Since the turns (continuous transposed conductors, CTC’s) 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, considering each single strand of the turns. In the present example, 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 behaviour of the high frequency oscillations of the system.

Conference

ConferenceCompumag 2017
CountryKorea, Republic of
CityDaejeon
Period18/06/1722/06/17
Internet address

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

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

2017. Paper presented at Compumag 2017, Daejeon, Korea, Republic of.

Research output: Contribution to conferencePaperResearchpeer-review

Preis, K, Rabel, A, Renhart, W & Biro, O 2017, 'Transient Behaviour of Large Transformer Windings Taking Capacitances and Eddy Currents into Account' Paper presented at Compumag 2017, Daejeon, Korea, Republic of, 18/06/17 - 22/06/17, .
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title = "Transient Behaviour of Large Transformer Windings Taking Capacitances and Eddy Currents into Account",
abstract = "Transformer windings, as oscillatory systems, respond to impulse excitation by starting to oscillate. In the paper, a detailed transient circuit analysis of an auto-transformer responding to a standard lightning impulse (LI) 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 FEM-calculations. To get the resistances of the turns, eddy currents have to considered. Since the turns (continuous transposed conductors, CTC’s) 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, considering each single strand of the turns. In the present example, 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 behaviour of the high frequency oscillations of the system.",
author = "Kurt Preis and Alexander Rabel and Werner Renhart and Oszkar Biro",
year = "2017",
language = "English",
note = "Compumag 2017 : 21st International Conference on the Computation of Electromagnetic Fields ; Conference date: 18-06-2017 Through 22-06-2017",
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T1 - Transient Behaviour of Large Transformer Windings Taking Capacitances and Eddy Currents into Account

AU - Preis, Kurt

AU - Rabel, Alexander

AU - Renhart, Werner

AU - Biro, Oszkar

PY - 2017

Y1 - 2017

N2 - Transformer windings, as oscillatory systems, respond to impulse excitation by starting to oscillate. In the paper, a detailed transient circuit analysis of an auto-transformer responding to a standard lightning impulse (LI) 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 FEM-calculations. To get the resistances of the turns, eddy currents have to considered. Since the turns (continuous transposed conductors, CTC’s) 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, considering each single strand of the turns. In the present example, 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 behaviour of the high frequency oscillations of the system.

AB - Transformer windings, as oscillatory systems, respond to impulse excitation by starting to oscillate. In the paper, a detailed transient circuit analysis of an auto-transformer responding to a standard lightning impulse (LI) 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 FEM-calculations. To get the resistances of the turns, eddy currents have to considered. Since the turns (continuous transposed conductors, CTC’s) 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, considering each single strand of the turns. In the present example, 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 behaviour of the high frequency oscillations of the system.

M3 - Paper

ER -