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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Conditioning Monitoring of Transformer Using Sweep Frequency Response for Winding Deformation
TL;DR: In this paper, a 10-section healthy helical coil is modelled as radially and axially deformed coils using FEM software and the deformation is carried at five consecutive sections; purpose of doing so to find the location of deformation corresponding to a similar deformation in an actual transformer.
Proceedings ArticleDOI
Instrumentation for Onsite Measurements on Power Transformers
TL;DR: In this article, the authors proposed electronic compensation techniques to enhance the accuracy and bandwidth of the bushing current transformers (CTs) and capacitive bushings/voltage transformer (VT) available at site so as to enable precision onsite measurement.
Proceedings ArticleDOI
Least deviation methods for location of partial discharge in transformer windings
TL;DR: In this article, the location of partial discharge in transformer windings is identified using least deviation methods, and the simulation studies are carried out on lumped layer winding to prove the feasibility of the methods.
Journal ArticleDOI
Automatic Diagnosis of Fault Locations in Power Transformer Impulse Test using Self-Organizing Map
TL;DR: In this paper, the authors proposed to use the Kohonen self-organizing map (SOM) for automatic diagnosis of fault locations in power transformer tests, which is a sort of pattern recognition technique and the point is to find relation between fault locations and measured current waveforms.
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.