Finite element computation of eddy current losses in nonlinear ferromagnetic sheaths of three-phase power cables

Defect reconstruction of remote field eddy current belonged to electromagnetic inverse problem in materia Non-Destructive Testing. In view of disadvantages in present defect reconstruction methods, such as over-long time or excessive need for training samples, a new defect reconstruction method based on similar model and genetic algorithm was investigated as follows: similar model between non-axisymetric defect and axisymetric defect was represented, and proportionality factor was deduced by skin depth equation. As a result, the time-consuming forward problem solution in defect reconstruction, which using 3D finite element computation conventionally, was simplified to 2D finite element computation. At the same time, a method designed to accelerate convergence of genetic algorithm was adopted, and more times saving were obtained. Computation results show that, total defect reconstruction time is reduced to 7.6%, compared with directly 3D finite elemet computation, while reconstruction accuracy remains almost the same.

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Three- and Two-Dimensional Finite-Element Computation of Inrush Current and Short-Circuit Electromagnetic Forces on Windings of a Three-Phase Core-Type Power Transformer

IEEE Transactions on Magnetics ◽

10.1109/tmag.2008.917819 ◽

2008 ◽

Vol 44 (5) ◽

pp. 590-597 ◽

Cited By ~ 51

Author(s):

J. Faiz ◽

B.M. Ebrahimi ◽

T. Noori

Keyword(s):

Finite Element ◽

Power Transformer ◽

Short Circuit ◽

Inrush Current ◽

Two Dimensional ◽

Three Phase ◽

Dimensional Finite Element ◽

Element Computation ◽

Type Power ◽

Finite Element Computation

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Analisa Stray Losses Pada Struktur Transformator Daya Satu Fasa 275 Kv 83.3 MVA

JTTM : Jurnal Terapan Teknik Mesin ◽

10.37373/msn.v1i1.13 ◽

2020 ◽

Vol 1 (1) ◽

pp. 32-40

Author(s):

Asep Saepudin Saepudin

Keyword(s):

Finite Element ◽

Eddy Current ◽

Simulation Study ◽

Single Phase ◽

3D Finite Element ◽

Eddy Current Losses ◽

Versus Measurement ◽

Three Phase

Background The jurnal discusse stray losses are generated by eddy current losses in the single phase transformer construction parts, such as Main tank, cover,core clamp and flitch plate. Stray losses can’t measurement direct and only calculated. Aim This study is to accurate calculated stray losses are generated in the single phase transformer construction parts in order to get more accurate calculated compared with measured and to know calculation versus measurement and versus simulation. Method This study using 3D Finite Element Metode with basis software ANSYS in the single phase transformer construction parts Result The stray losses in the single phase transformer construction parts, so that it hasn’t a simple stray losses divided by 3 compared to three phase transformers with same power and voltage. Conclusion Base on this study the total stray losses around 30%-37% from Load Losses and impove approxi-mately 9% compared between existing calculation and this simulation study versus measurement.

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