Journal ArticleDOI
A general method for determining resonances in transformer windings
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TLDR
In this article, the authors present a method for calculating terminal and internal impedance versus frequency for a lumped parameter model of a transformer, where the transformer's total frequency response can be accurately determined from this impedance data directly, i.e., the terminal resonance and anti-resonance and internal amplification factor characteristic can be calculated for a single or three-phase transformer model.Abstract:
This paper presents a method for calculating terminal and internal impedance versus frequency for a lumped parameter model of a transformer The transformer's total frequency response can be accurately determined from this impedance data directly, ie, the terminal resonance and anti-resonance and internal amplification factor characteristic can be calculated for a single or three-phase transformer model Since most equipment associated with power system operation can be accurately modeled with lumped parameter networks, this method also provides an accurate, straightforward method for determining the resonance characteristic of those systems An additional significance of this method is that the accuracy of the calculation is limited only by the user's ability to represent the equipment or system Heretofore, the accuracy of this calculation was limited by the simplifying assumptions required of the network model by each solution method This paper presents the definitions and mathematical theory underlying the method Two examples are presented in which comparisons are made between measured and calculated values for a helical air core coil and a 200 MVA single-phase autotransformer The agreement is excellentread more
Citations
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Proceedings ArticleDOI
Internal resonant overvoltage in wind turbine transformers- sensitivity analysis of measurement techniques
TL;DR: In this article, the internal resonances of three windings are compared and the least venerable one, pancake, is introduced and the focus will be on the assessment of measurement techniques and the sensitivity analysis of the obtained results on them.
Journal ArticleDOI
Natural Frequencies and Transient Responses of Three-Phase Transformer Windings
TL;DR: In this article, the authors presented a new procedure to compute the natural frequencies, transient voltages in the windings subjected to impulses and the transferred transient voltage in the coupled windings.
Journal ArticleDOI
A Contribution to the Frequency Analysis and Transient Response of Power Transformer Windings
TL;DR: In this article, a closed-form Laplace s-domain analytical expression for the winding's input impedance was obtained for any neutral treatment. And the resulting expression can be used to determine the windings's series and parallel resonance frequencies.
Book ChapterDOI
Transient-Voltage Response of Coils and Windings
TL;DR: This chapter will highlight recommendations for the proper receipt, inspection, field assembly, oil processing, acceptance testing, and maintenance of large liquid-immersed power transformers rated 10 MVA or greater or with primary voltage rating of 69 kV and above.
Proceedings ArticleDOI
On two-coupled inductors stray capacitances evaluation for CAD-oriented modeling
TL;DR: In this paper, the authors provide a method of evaluating two equivalent lumped capacitances by taking into account the physical effects of the stray capacitance in two coupled inductors.
References
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Journal ArticleDOI
Digital Computer Solution of Electromagnetic Transients in Single-and Multiphase Networks
TL;DR: Electromagnetic transients in arbitrary single- or multiphase networks are solved by a nodal admittance matrix method based on the method of characteristics for distributed parameters and the trapezoidal rule of integration for lumped parameters.
Journal ArticleDOI
Response of Transformer Windings to System Transient Voltages
TL;DR: In this paper, the relationship between the resonance phenomenon and pulse response is explained and illustrated with practical examples for the standard test waveforms, and a proposed alternative switching surge waveform is examined for its effect on the internal response of transformer windings.
Journal ArticleDOI
Natural Frequencies of Coils and Windings Determined by Equivalent Circuit [includes discussion]
P. A. Abetti,F. J. Maginniss +1 more
TL;DR: In this article, an equivalent circuit method is derived for the computation of all the natural frequencies of interest of both air-core and iron-core coils, which takes into account all mutual inductance linkages, which usually have been neglected in the literature.
Journal ArticleDOI
Transformer Models for the Determination of Transient Voltages [includes discussion]
Journal ArticleDOI
Experience with part-winding resonance in EHV auto-transformers: Diagnosis and corrective measures
TL;DR: In this paper, four failures of large EHV auto-transformers on the AEP system were described, initiated by flashovers in the no-load tap changer during system faults.