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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Journal ArticleDOI
On waveform distortion in the frequency range of 2 kHz–150 kHz—Review and research challenges
Sarah K. Ronnberg,Math Bollen,Hortensia Amaris,Gary W. Chang,Irene Yu-Hua Gu,Łukasz Hubert Kocewiak,Jan Meyer,Magnus Olofsson,Paulo F. Ribeiro,Jan Desmet +9 more
TL;DR: An overview of the state-of-the-art concerning these so-called supraharmonics, and noticeably indicates the research challenges associated with waveform distortion in this frequency range.
Journal ArticleDOI
Detailed modeling of superconducting magnetic energy storage (SMES) system
TL;DR: In this article, a detailed model for simulation of a superconducting magnetic energy storage (SMES) system is presented, which has the potential to bring real power storage characteristic to the utility transmission and distribution systems.
Journal ArticleDOI
Application of combined adaptive Fourier filtering technique and fault detector to fast distance protection
TL;DR: In this paper, a combined adaptive Fourier filtering technique and fault detector is proposed for fast distance protection of transmission lines, which is extended from the Fourier filters and can be applied under arbitrary data window length.
Journal ArticleDOI
Simplified three-phase transformer model for electromagnetic transient studies
S. Chimklai,Jose R. Marti +1 more
TL;DR: In this article, a simplified high-frequency model for three-phase, two-and three-winding transformers is presented, based on the classical 60 Hz equivalent circuit, extended to high frequencies by the addition of the winding capacitances and the synthesis of the frequency-dependent short-circuit branch by an RLC equivalent network.
Journal ArticleDOI
A Method for Analyzing Harmonic Distribution in A.C. Power Systems
Aly A. Mahmoud,Richard D. Shultz +1 more
TL;DR: In this article, the authors present a method for a analyzing actoristic harmonic current propagation into an AC system, which is applied to two different systems and the responses of individual elements and the system as a whole were observed.
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.
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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.
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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.