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
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Proceedings ArticleDOI
Internal overvoltages in cast resin transformer windings in presence of resonance effects
TL;DR: In this paper, the authors compared the stress arising during lightning impulse test with that originated during switching operations, in case of oscillating transients, and presented the frequency and impulse responses of cast resin transformer windings.
Journal ArticleDOI
The Transient Response and Frequency Characteristics of Power Transformers Having Internal Winding Faults
TL;DR: In this article, the transient response of a transformer winding under faulty conditions is analyzed using distributed-parameter analysis and is capable of taking the non-uniform distributions of the winding's inductances and capacitances into account.
Journal ArticleDOI
Przepięcia wewnętrzne w uzwojeniach transformatorów blokowych
TL;DR: In this article, the problem of winding insulation damage in unit transformers due to internal overvoltages has been described and the results of computer analyses on voltage distribution along transformer windings at different switching operations and faults in supply line are presented.
Streszczenie. Omówiono zagadnienie uszkodzeń izolacji uzwojeń transformatorów blokowych wynikających z oddziaływania przepięć wewnętrznych. Przedstawiono wyniki symulacji komputerowych w zakresie analiz rozkładów napięcia wzdłuż uzwojeń transformatora przy rozmaitych operacjach łączeniowych oraz zakłóceniach w linii zasilającej. Do obliczeń zastosowano model matematyczny uzwojeń typowego transformatora blokowego uwzględniający jego rzeczywiste parametry. Podano wyniki obliczeń oraz wnioski.
Edward Anderson,Janusz Karolak +1 more
TL;DR: In this article, the problem of winding insulation damage in unit transformers due to internal overvoltages has been described and the results of computer analyses on voltage distribution along transformer windings at different switching operations and faults in supply line are presented.
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.