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
Modelling of foil-type transformer windings for computation of terminal impedance and internal voltage propagation
Andreas Theocharis,Marjan Popov +1 more
TL;DR: In this article, an equivalent lumped-parameter circuit model is presented, which is suitable for the computation of the terminal impedance within a broad frequency range and for internal voltage propagation studies.
Transformer Linear Section Model Order Reduction with an Improved Pole Clustering
TL;DR: A reduction technique which was the detailed lumped parameter linear transformer model order as a starting point and allows its reductions to any size of the model order specified by the user is presented.
Proceedings ArticleDOI
Online Dynamic Parameter Estimation of Transformer Equivalent Circuit
TL;DR: In this paper, the dynamic parameters of a transformer, including its inductances and resistances, are estimated by the application of recursive least squares routine on the measured terminal voltages and currents.
Journal ArticleDOI
New approach to the analysis of impulse voltage distribution in transformer windings
O. Honorati,E. Santini +1 more
TL;DR: In this paper, a new calculation method for the analysis of transient voltage phenomena in HV power transformers is presented, considering the electric, magnetic and current fields in the windings.
Proceedings ArticleDOI
A black-box approach to interfacing white-box transformer models with electromagnetic transients programs
Bjorn Gustavsen,Alvaro Portillo +1 more
TL;DR: In this paper, a black-box model of a white-box transformer model with rational functions, including voltage transfer functions from external terminals to internal nodes, is used to evaluate the internal overvoltages that can occur in practice.
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.