Analysis of Buckling Strength of Inner Windings in Transformers Under Radial Short-Circuit Forces

Bakshi, Amit; Kulkarni, S.V.

doi:10.1109/tpwrd.2013.2272102

Cited by 52 publications

(28 citation statements)

References 3 publications

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“…The authors of [1] for example analyze spiraling phenomenon in helical transformer windings based on flat wires. In [2] a buckling strength analysis for a winding built with an epoxy-bonded continuously transposed cable is proposed. Due to the ) - epoxy-bonding, the authors simplify the CTC as a massive conductor with same cross-section outer dimensions.…”

Section: Short Circuit Problem Of Power Transformersmentioning

confidence: 99%

“…Due to the ) - epoxy-bonding, the authors simplify the CTC as a massive conductor with same cross-section outer dimensions. For a non epoxy-bonded CTC the hint to use an equivalent cross section corresponding to a strand can be found in [2] without further proofs. In this paper a similar approach to describe the buckling behavior of CTC based windings will be developed and verified by the use of detailed FEA models.…”

Section: Short Circuit Problem Of Power Transformersmentioning

confidence: 99%

See 1 more Smart Citation

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

Geissler

2016

Mathematics and Computers in Simulation

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Section: Short Circuit Problem Of Power Transformersmentioning

confidence: 99%

Section: Short Circuit Problem Of Power Transformersmentioning

confidence: 99%

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

Geissler

2016

Mathematics and Computers in Simulation

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“…Especially in the case of strongly interconnected power systems with very high short-circuit current capacities, the probability of such events increases. In the past, there have been many experiments and analytic as well as simulative investigations in order to master the shortcircuit strength of power transformers [1]- [8]. The authors of [1] presented a short-circuit test apparatus to determine the strength of inner transformer windings against radial forces.…”

Section: Introductionmentioning

confidence: 99%

Short-Circuit Strength of Power Transformer Windings-Verification of Tests by a Finite Element Analysis-Based Model

Geibler

2017

IEEE Trans. Power Delivery

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A test stand to evaluate the radial buckling strength of power transformer windings under the influence of electromagnetic forces is presented. The resulting conductor deformation can be measured in parallel to the sinusoidal test current. The proposed test results focus on the inception of forced buckling for continuously transposed conductors (CTCs), which are a special type of conductors often used in power transformer windings. In literature, there barely exist calculations to the radial buckling withstand capability of CTCs. Therefore, a Finite Element Analysis (FEA) based simulation model for this kind of conductor is proposed and verified by the tests. For this verification, three different CTC types are used. The final simulation model is based on a coupled analysis of magnetostatic force calculation and static structural deformation analysis. It suitably reproduces the measurement results from the dynamic short-circuit tests. Furthermore, a standard formula describing radial buckling phenomena inside power transformers is adapted for the use with CTCs.Index Terms-Power transformer, short circuit forces, continuously transposed cable (CTC), forced buckling, Finite Element Analysis (FEA). 0885-8977 (c)

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“…This strain is known as the residual strain which remains in the winding conductors prior to the short-circuit event. In [13], the strain has been taken into account in the buckling analysis of the innermost winding of a power transformer. The effects of the presence of winding process induced strain and the strain induced due to the manufacturing processes like cold working in the conductors were not taken into account in the radial mechanical strength analysis of the transformer windings as reported in the previous literature.…”

Section: Introductionmentioning

confidence: 99%

“…Here ρ is the radius of surface DE and θ is the angle subtended by the surface. Since DE surface is the neutral surface therefore its length remains L. The change in length of any other surface and hence the strain x ε in the surface is given by [13,14] .…”

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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Analysis of Buckling Strength of Inner Windings in Transformers Under Radial Short-Circuit Forces

Cited by 52 publications

References 3 publications

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

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

Short-Circuit Strength of Power Transformer Windings-Verification of Tests by a Finite Element Analysis-Based Model

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

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