Multiscale Computations of Parameters of Power Transformer Windings at High Frequencies. Part II: Large-Scale Level

Podoltsev, O.D.; Abeywickrama, Nilanga; Serdyuk, Yuriy V.; Gubanski, Stanislaw

doi:10.1109/tmag.2007.908371

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…Mutual inductance and resistance between i th and j th winding sections can be calculated using the parameters obtained in equations (5) and (6) along with additional solution for energy stored when current is applied to both winding sections [27]. .…”

Section: Transformer Equivalent Circuit Parameters Calculationmentioning

confidence: 99%

Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation

Hashemnia

Abu-Siada

Islam

2015

IEEE Trans. Dielect. Electr. Insul.

131

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Frequency response analysis (FRA) has become a widely accepted tool to detect power transformer winding deformation due to the development of FRA test equipment. Because FRA relies on graphical analysis, interpretation of its signature is a very specialized area that calls for skilled personnel, as so far, there is no reliable standard code for FRA signature identification and quantification. Many researchers investigated the impact of various mechanical winding deformations on the transformer FRA signature using simulation analysis by altering particular electrical parameters of the transformer equivalent electrical circuit. None of them however, investigated the impact of various physical fault levels on the corresponding change in the equivalent circuit parameters. In this paper, the physical geometrical dimension of a single-phase transformer is simulated using 3D finite element analysis to emulate the real transformer operation. A physical axial displacement of different fault levels is simulated in both low voltage and high voltage windings. The impact of each fault level on the electrical parameters of the equivalent circuit is investigated. A key contribution of this paper is the charts it introduces to correlate various axial displacement levels with the percentage change of all transformer equivalent circuit parameters due to the axial displacement fault. In contrary with other researchers who only considered mutual inductance between low voltage and high voltage windings, simulation resultsshown in this paper reveal that other circuit parameters should be changed by a particular percentage to accurately simulate particular fault level of transformer winding axial displacement. Results of this paper aid to precisely simulating winding axial displacement using transformer equivalent circuit that facilitates accurate qualitative and quantitative analysis of transformer FRA signatures.

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Section: Transformer Equivalent Circuit Parameters Calculationmentioning

confidence: 99%

Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation

Hashemnia

Abu-Siada

Islam

2015

IEEE Trans. Dielect. Electr. Insul.

131

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“…In a wide frequency FRA test range from 10Hz to 1MHz, the frequency-dependent effect can be considered by calculating the permeability tensors in lamination core and volume of the conductors [11]. The frequency-dependent inductance and resistance can be determined by using 3-D FEM electromagnetic analysis which has enough computation accuracy.…”

Section: B Calculation Of Frequency-dependent Parametermentioning

confidence: 99%

Double-Ladder Circuit Model of Transformer Winding for Frequency Response Analysis Considering Frequency-Dependent Losses

2015

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It is well known that power transformers inevitably suffer the impacts of short-circuit electromagnetic forces in service. For precise diagnosis investigation of winding mechanical deformation, this paper presents a double-ladder circuit model of transformer winding with lumped parameters for frequency response analysis. This advanced model includes the axial and radial ladder network with regard to the winding discs and the eddy current paths of magnetic core, respectively. In the radial ladder network, the nonlinear behavior of frequency-dependent parameters and core loss are considered. Relevant equivalent parameters in this double-ladder circuit model are calculated by using three-dimensional finite element method (FEM). The energy balance method is applied to obtain the frequency-dependent inductances and resistances. In order to verify the effectiveness of this model, the frequency response of voltage ratio at a wide frequency range from a few tens of hertz up to megahertz are simulated and measured.

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“…Its value is a compromise between the degree of required accuracy and limited load computation effort where in our case, the value of 500 is found to be acceptable. For the calculation of the self-impedance of a coil, d 1 = 0 in (23) and the function F (β)i sd e fined as…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Either for the distributed parameter or for the lumped parameter models, parameter determination is very important because it heavily affects model accuracy. In [19][20][21][22][23][24][25], accurate computation of parameters by finite elements methods has been reported. Apart from this, there are efficient computational methods that can be used for the determination of the inductance and capacitance matrix as well as accurate representation of losses.…”

Section: Introductionmentioning

confidence: 99%

Modelling of foil‐type transformer windings for computation of terminal impedance and internal voltage propagation

Theocharis

Popov

2015

IET Electric Power Applications

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The goal of this work is to develop an efficient numerical model of foil-type windings. An equivalent lumpedparameter 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. Owing to the special geometrical winding shape, particular attention has been paid to the calculation of the involved lumped parameters where efficient and accurate formulas for parameter determination are presented. The core influence is investigated for the broad frequency range by taking into account the frequency dependency of core material properties. Simulated results compared to measurements show that the proposed equivalent circuit in combination with the applied formulas for parameter determination can be used with full success for the computation of the terminal impedance and internal voltage distribution studies.

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Multiscale Computations of Parameters of Power Transformer Windings at High Frequencies. Part II: Large-Scale Level

Cited by 19 publications

References 6 publications

Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation

Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation

Double-Ladder Circuit Model of Transformer Winding for Frequency Response Analysis Considering Frequency-Dependent Losses

Modelling of foil‐type transformer windings for computation of terminal impedance and internal voltage propagation

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