Analysis of electromagnetic-mechanical stresses on the winding of a transformer under inrush currents conditions

Fonseca, Wellington da Silva; Lima, Diorge de Souza; Lima, Adry Kleber Ferreira de; Soeiro, Newton Sure; Nunes, Marcus Vinícius Alves

doi:10.3233/jae-150044

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…Ref. [8] analyzed the short-circuit forces on the windings of a 50 KVA, dry-type transformer under short-circuit current using finite elements and verified the correctness of the simulation analysis by experiments. In Ref.…”

Section: Introductionmentioning

confidence: 91%

“…In the case of magnetic saturation of the iron core, the system reactance value Xs can be calculated by Equation (8). When calculating the peak inrush current, it is first necessary to determine the saturation flux in the core, which can be determined by Equation (5).…”

Section: Generation and Calculation Of Excitation Inrush Currentmentioning

confidence: 99%

“…Refs. [7,8] analyzed the electromagnetic forces generated by inrush currents and the impact they have on the transformer structure. Mechanical failures of the transformer usually manifest as the deformation and the displacement of the windings.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Electromechanical Characteristics of Power Transformer under Different Residual Fluxes

Zhang

Xie

et al. 2021

Energies

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When the electromagnetic transients occur in a power transformer, an inrush current is generated in its winding. The inrush current not only affects the performance of the transformer windings, but also affects the lifetime of the transformer. Many factors affect the inrush current, the most influential ones among which are the closing phase angle and the residual flux. In this paper, a dry-type transformer simulation model is built to analyze the influence of the inrush current on the performance of transformer windings during no-load reclosing conditions. Firstly, the inrush current was generated in the transformer windings during the no-load reclosing operation under different residual fluxes. Secondly, the field-circuit coupling 3d finite element method is used to analyze the electromagnetic force at different locations of the transformer windings under the influence of different inrush currents. The results of winding structural parameter variations are obtained through electromagnetic-structural coupling simulation, and the electromagnetic forces are used as the input parameter for the structural analysis. Finally, the residual flux is generated by controlling the opening and closing angle of the transformer through the phase-controlled switch, and the winding electromechanical characteristics are tested under different residual fluxes. Finally, comparisons of the test and simulation results are drawn to verify the impact of the closing angle and residual flux on inrush current and the winding deformation during the no-load reclosing conditions.

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Section: Introductionmentioning

confidence: 91%

Section: Generation and Calculation Of Excitation Inrush Currentmentioning

confidence: 99%

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Analysis of the Electromechanical Characteristics of Power Transformer under Different Residual Fluxes

Zhang

Xie

et al. 2021

Energies

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“…The use of FEM simulations is one of the best cost-effective alternatives to solve engineering problems. However, to obtain results increasingly closer to physical reality, simulations must consider the coupling between several physical phenomena (multiphysics), as demonstrated in Fonseca et al and Yana et al [11,12].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

et al. 2021

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The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also compromising its operation and, consequently, the electric power supply. Thus, in this paper, electromagnetic, thermal, and structural analysis of power transformers was carried out with the objective of providing the operator with information on the ideal moment for performing predictive maintenance, avoiding unplanned shutdowns. For this, computational simulations were performed using the finite element method (FEM) and, from that, the different transformer operation ways, nominal currents, inrush current, and short-circuit current were analyzed. In this perspective, analyses of the effects that thermal expansion, axial forces, and radial forces exerted were carried out, contributing to possible defects in this type of equipment. As a study object, simulations were carried out on a 50 MVA single-phase transformer. It is important to emphasize that the simulations were validated with real data of measurements and with results presented in the current literature.

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“…Residual flux does a conspicuous influence on the inrush phenomenon. In fact, such events may result in high levels of transient current, which may last for quite significant periods of time [4]. Due to this inrush current, electromechanical force and its corresponding influence may affect the transformer mechanical structure and its lifetime.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the residual flux influence on inrush current and electromagnetic force in large power transformer

Zhao

Wang

2019

J. eng.

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Analysis of electromagnetic-mechanical stresses on the winding of a transformer under inrush currents conditions

Cited by 13 publications

References 16 publications

Analysis of the Electromechanical Characteristics of Power Transformer under Different Residual Fluxes

Analysis of the Electromechanical Characteristics of Power Transformer under Different Residual Fluxes

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Analysis of the residual flux influence on inrush current and electromagnetic force in large power transformer

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