Simulation of forces and 3-D field arising during power autotransformer fault due to electric arc in HV winding

Zakrzewski, K.; Tomczuk, B.; Koteras, Dariusz

doi:10.1109/20.996295

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…AST construction is based on the well-known structures of the three-phase transformers with magnetically symmetrical cores given by Doliwo-Dobrowolski (Zakrzewski et al, 2002). He developed and patented such construction towards the end of the nineteenth century in the USA ( Jabłoński, 2002).…”

Section: Description Of the Objects And Calculation Modelsmentioning

confidence: 99%

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Amorphous modular transformers and their 3D magnetic fields calculation with FEM

Zakrzewski

Tomczuk

Koteras

2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to examine the calculation of magnetic field distribution in the modular amorphous transformers under short-circuit state including the flux by the voltage supplying. The magnetically asymmetrical transformer (amorphous asymmetrical transformer -AAT) has been compared also with the symmetrical one (amorphous symmetrical transformer -AST). Design/methodology/approach -3D field problems were analyzed with total c and reduced f potentials within the finite element method (FEM). The calculated fluxes have been verified experimentally. Findings -The field method which includes voltage excitation is helpful for flux density (B) calculation and winding reactances determination, as well. Calculations and tests yield similar flux distributions in both AST and AAT constructions. One should emphasize that AAT is better for manufacturing and repairing. Research limitations/implications -Owing to very thin (80 mm) amorphous ribbon, the solid core has been assumed for computer simulations.

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Section: Description Of the Objects And Calculation Modelsmentioning

confidence: 99%

“…As AST has symmetrical structure, the region to be analyzed has been halved along the XZ-plane (Figure 1) (Zakrzewski et al, 2002). Assuming one moment in the three-phase current waveforms, only a part of the AST can be taken into consideration.…”

Section: Amorphous Modular Transformersmentioning

confidence: 99%

Amorphous modular transformers and their 3D magnetic fields calculation with FEM

Zakrzewski

Tomczuk

Koteras

2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…1 are presented the loss values in silicon steel sheets and in amorphous ribbons versus the magnetic flux density values. In the amorphous alloy, the core losses are several times lower than in grain-oriented silicon steel [4,8,10]. Thus, the amorphous core is more efficient for electromagnetic energyconversion devices than the traditional one.…”

Section: Introductionmentioning

confidence: 96%

Magnetic flux distribution in the amorphous modular transformers

Tomczuk

Koteras

2011

Journal of Magnetism and Magnetic Materials

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“…This leads to the reduction of total losses of the power system. For the mode of load and noload operations, the main parameters of transformers must be concerned such as efficiency, loss, temperature rise, and core weight [5][6][7][8]. As a sudden short-circuit in the low-voltage winding of the transformer or a short-circuit between connected turns occurs, the magnetic flux distribution in the magnetic circuit is small, but the leakage/fringing flux in the air gap is very large.…”

Section: Introductionmentioning

confidence: 99%

Computation of electromagnetic forces in the windings of amorphous core transformers

2024

Archives of Electrical Engineering

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Electromagnetic forces generated by the short circuit current and leakage flux in low-and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low-and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.

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Simulation of forces and 3-D field arising during power autotransformer fault due to electric arc in HV winding

Cited by 11 publications

References 3 publications

Amorphous modular transformers and their 3D magnetic fields calculation with FEM

Amorphous modular transformers and their 3D magnetic fields calculation with FEM

Magnetic flux distribution in the amorphous modular transformers

Computation of electromagnetic forces in the windings of amorphous core transformers

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