Journal ArticleDOI
An Investigation of Winding Curvature Effect on the Mechanical Strength of Transformer Windings
Reads0
Chats0
TLDR
In this paper, the effect of the residual strain on the mechanical strength of transformer windings under the worst case condition of the short circuit has been investigated and the distribution of residual strain in the conductors during its winding process has been determined analytically.Abstract:
During the winding process of a transformer, a residual strain is induced in its windings conductors. In this paper, the effect of the strain on the mechanical strength of transformer windings under the worst case condition of the short circuit 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 resulting strain. By using the Ramberg-Osgood stress-strain relation of the conductor (copper) material, resulting stress is determined. A case study has been given where 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.read more
Citations
More filters
Journal ArticleDOI
Short-Circuit Strength of Power Transformer Windings-Verification of Tests by a Finite Element Analysis-Based Model
Daniel Geibler,Thomas Leibfried +1 more
TL;DR: In this paper, a finite-element analysis-based simulation model for CTCs is proposed and verified by the tests, and the final simulation model is based on a coupled analysis of magnetostatic force calculation and static structural deformation analysis.
Journal ArticleDOI
Buckling Strength Analysis of Transformer Windings Based on Electromagnetic Thermal Structural Coupling Method
TL;DR: In this paper, a method for analyzing the buckling strength of transformer windings based on electromagnetic thermal structure coupling method is presented, which takes into account the factors of plastic deformation and thermal effect.
Journal ArticleDOI
Methodology to Evaluate the Electromechanical Effects of Electromagnetic Forces on Conductive Materials in Transformer Windings Using the Von Mises and Fatigue Criteria
Jalberth Fernandes de Araujo,Edson Guedes da Costa,F. L. M. Andrade,André Dantas Germano,Tarso Vilela Ferreira +4 more
TL;DR: In this article, a methodology based on computer simulations and aiming to estimate the lifespan of transformer windings after the occurrence of short circuits is presented, where the Von Mises and fatigue criteria are employed to determine the failure proximity of the windings.
Journal ArticleDOI
Monitoring Method on Loosened State and Deformational Fault of Transformer Winding Based on Vibration and Reactance Information
TL;DR: Losened state and deformational fault of windings can be monitored by proposed monitoring method based on vibration and reactance information effectively, which provide basis for multi-information monitoring.
Journal ArticleDOI
Investigation of the impact of a standard lightning impulse on the structure of an 11/0.415 kV distribution transformer
TL;DR: In this article , a model was proposed to investigate the effect of Standard Lightning Impulses at voltages below the Basic Insulation Level (BIL) on winding geometry, based on the extraction of resistances, inductances, capacitances and conductance using Finite Element Method (FEM) and the resultant structural movement.
References
More filters
Book
Transformer Engineering: Design, Technology, and Diagnostics, Second Edition
S.V. Kulkarni,S.A. Khaparde +1 more
TL;DR: Transformer Engineering: Design, Technology, and Diagnostics, Second Edition as discussed by the authors helps to design better transformers, apply advanced numerical field computations more effectively, and tackle operational and maintenance issues.
Journal ArticleDOI
Analysis of Buckling Strength of Inner Windings in Transformers Under Radial Short-Circuit Forces
Amit Bakshi,S.V. Kulkarni +1 more
TL;DR: In this paper, the Ramberg-Osgood stress-strain relation has been used to calculate the critical buckling stress and compared with the resulting stress, and the analytically obtained result of the strain induced in the winding conductor during its winding process has been verified using the finite-element method.
Journal ArticleDOI
Short-Circuit Strength of Power Transformer Windings-Verification of Tests by a Finite Element Analysis-Based Model
Daniel Geibler,Thomas Leibfried +1 more
TL;DR: In this paper, a finite-element analysis-based simulation model for CTCs is proposed and verified by the tests, and the final simulation model is based on a coupled analysis of magnetostatic force calculation and static structural deformation analysis.