Mechanical Strength of Transformer Windings under Short-Circuit Conditions

Kurita,; Kuriyama,; Hiraishi,; Kusumoto,; Shida,; Hori,

doi:10.1109/tpas.1969.292310

Cited by 15 publications

(7 citation statements)

References 1 publication

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“…All CTCs inside the left segment S 4 are in their origin state, while the inner CTC turns inside the right segment S 5 were stripped of the insulating paper. As the middle turn is exposed to the highest radial electromagnetic force, the markers M 4 From tracking results, the influence of paper insulation on the CTC stiffness shall be evaluated. Furthermore, the CTC´s resistance against radial buckling can be compared.…”

Section: A Ctc Test Setup Configuration and Testing Methodsmentioning

confidence: 99%

“…In [3] the authors used acceleration sensors to monitor axial and radial displacements of a winding during a short-circuit event. In [4] strain gauges were used to measure the coil displacements by converting the displacements into strain in an acrylic resin plate. The authors of [5] designed a special test set-up to represent a winding section of a real transformer and to allow easy replacement of the test windings as well as gather reproducible tests.…”

Section: Introductionmentioning

confidence: 99%

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Deformation measurement system for buckling tests on Continuously Transposed Cable using a high-speed camera

Geissler

2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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An optical deformation measurement system for buckling tests on Continuously Transposed Cable (CTC) using high-speed camera recordings and marker tracking is proposed. The aim of the buckling test setup is to analyze the mechanical strength of CTCs with respect to radially acting electromagnetic forces as they appear in power transformers. Therefore a CTC winding arrangement is fed by a short-circuit current while the deformation is recorded by the camera system. The verification of the new deformation measurement system is done by an independent system based on acceleration sensors. Especially operationally aged power transformers can be affected by high short circuit currents, resulting in serious damages on windings. Thus, the influence of ageing phenomena on the mechanical strength of CTCs like degradation of the paper insulation shall be investigated with the proposed system. Experimental results are proposed for a factory-new CTC and the influence of paper insulation on its stiffness is evaluated from the marker tracking results during the short circuit tests.

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Section: A Ctc Test Setup Configuration and Testing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation measurement system for buckling tests on Continuously Transposed Cable using a high-speed camera

Geissler

2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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“…(2) or By using (2), (1) gets modified as (3) Writing the above two equations in a matrix form, we have (4) where (5) The matrix in (4) …”

Section: A Disk Windingsmentioning

confidence: 99%

Eigenvalue Analysis for Investigation of Tilting of Transformer Winding Conductors Under Axial Short-Circuit Forces

Bakshi

Kulkarni

2011

IEEE Trans. Power Delivery

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The tilting phenomenon may lead to a catastrophic failure, such as an interturn fault in transformers, under the action of axial short-circuit electromagnetic forces. In this paper, first, a state-space approach has been used to determine the eigenvalues of various winding configurations used in practice by assuming a small value of tilt angle up to 10 . These eigenvalues decide the critical tilting forces and the natural frequencies of windings. The four cases involving disk, layer, helical windings (all these with strip conductor), and layer winding with continuously transposed cable conductor have been analyzed. Further, initial critical tilt angles are determined for various magnitudes of the axial force in a typical 5-MVA transformer.

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“…The authors of [1] presented a short-circuit test apparatus to determine the strength of inner transformer windings against radial forces. In [2] a study about the short-circuit strength of large transformer windings is presented. The authors derived a simple equation for the radial buckling strength of windings simplified to a circular ring.…”

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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Mechanical Strength of Transformer Windings under Short-Circuit Conditions

Cited by 15 publications

References 1 publication

Deformation measurement system for buckling tests on Continuously Transposed Cable using a high-speed camera

Deformation measurement system for buckling tests on Continuously Transposed Cable using a high-speed camera

Eigenvalue Analysis for Investigation of Tilting of Transformer Winding Conductors Under Axial Short-Circuit Forces

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

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