The Dynamic Response of Low Voltage, High Current, Disk type Transformer Windings to through Fault Loads

Thompson, Hugh A.; Tillery, F.; Rosenberg, D.U. von

doi:10.1109/tpas.1979.319272

Cited by 19 publications

(7 citation statements)

References 3 publications

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“…The failure modes include winding collapse or bending between supports. If the winding is of disk type, each disk is subjected to a radial force that can be calculated as [18,19] where, mean σ is mean stress calculated in (6), P r is the radial force in kN per mm of length, A c is cross sectional area of the disk in mm 2 , n c is number of conductors in each disk and D w is the mean diameter of the winding in mm.…”

Section: Radial Force Failure Modementioning

confidence: 99%

Improved power transformer winding fault detection using FRA diagnostics – part 2: radial deformation simulation

Hashemnia

Abu-Siada

Islam

2015

IEEE Trans. Dielect. Electr. Insul.

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Frequency response analysis (FRA) is proven to be a powerful tool to detect winding deformation within power transformers. Although the FRA test along with the equipment are well developed, interpretation of FRA signature is still a challenge and it needs skilled personnel to identify and quantify the fault type if exists as at this stage, there is no reliable standard code for FRA signature classification and quantification. As it is very hard to implement faults on physical transformer without damaging it, researchers investigated the impact of various mechanical winding deformations on the transformer FRA signature by randomly changing the value of particular electrical parameters of the transformer equivalent electrical circuit. None of them however, precisely investigated the correlation between physical fault level and the percentage change in each parameter. In this paper, the physical geometrical dimension of a singlephase transformer is simulated using 3D finite element analysis to emulate the real transformer operation. A physical radial deformation of different fault levels is simulated on both low voltage and high voltage windings. The impact of each fault level on the electrical parameters of the equivalent circuit is investigated and the correlation between the fault level and the percentage change in each parameter of the equivalent circuit is provided. This will facilitate precise fault simulation using transformer equivalent electrical circuit and ease the quantification analysis of FRA signature.

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Section: Radial Force Failure Modementioning

confidence: 99%

Improved power transformer winding fault detection using FRA diagnostics – part 2: radial deformation simulation

Hashemnia

Abu-Siada

Islam

2015

IEEE Trans. Dielect. Electr. Insul.

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“…The underlying relationship is Eq. (23) according to [8]. Young's modulus E = 130 GPa remains the same as for the linear buckling analysis.…”

Section: Methodsmentioning

confidence: 99%

“…In order to analyze the radial buckling strength of windings, many approaches have been investigated. Usually the problem is considered as uniformly compressed circular arch with hinged ends [8,7]. For the conductors flat magnet wires are often considered.…”

Section: Short Circuit Problem Of Power Transformersmentioning

confidence: 99%

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Simplified simulation model of continuously transposed cable for linear and nonlinear buckling analysis

Geissler

2016

Mathematics and Computers in Simulation

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“…Failure mechanisms due to the radial force are buckling of the inner winding, radial bending of the innermost winding conductors between the adjacent axial insulation spacers, and stretching of the outer winding conductors [6][7][8][9][10][11][12]. The effect of the radial force on the outer winding conductors is to produce tensile stress in them.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Winding Curvature Effect on the Mechanical Strength of Transformer Windings

Bakshi

2015

IEEE Trans. Power Delivery

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During the winding process of a transformer, a residual strain is induced in its windings conductors. In this paper, effect of the strain on the mechanical strength of transformer windings under the worst case condition of shortcircuit has been investigated. The distribution of the residual strain in the conductors during its winding process has been determined analytically. The strain induced in the conductors under the action of radial short-circuit forces has been computed. The two strains are then added to obtain a resultant strain. By using the Ramberg-Osgood stress-strain relation of the conductor (copper) material, a resultant stress is determined. A case study has been given in which the presence of residual strain in the conductors of a power transformer has been taken into account for determining its mechanical strength under the worst case condition of short-circuit.Index Terms-Electromagnetic force, manufacturing stress, mechanical strength, residual strain, short circuit, transformers. 0885-8977 (c)

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The Dynamic Response of Low Voltage, High Current, Disk type Transformer Windings to through Fault Loads

Cited by 19 publications

References 3 publications

Improved power transformer winding fault detection using FRA diagnostics – part 2: radial deformation simulation

Improved power transformer winding fault detection using FRA diagnostics – part 2: radial deformation simulation

Simplified simulation model of continuously transposed cable for linear and nonlinear buckling analysis

An Investigation of Winding Curvature Effect on the Mechanical Strength of Transformer Windings

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