The spatial variation of localized power loss in two practical transformer T-joints

Moses, Anthony John; Thomas, B.W.J.

doi:10.1109/tmag.1973.1067715

Cited by 45 publications

(13 citation statements)

References 4 publications

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“…In Although similar results have already been obtained using FEM analysis [22], [23], [28], [29], [44] or experiments [7], [IO], [30], [40], our approach offers the following advantages.…”

Section: Electric Modelsupporting

confidence: 73%

Anisotropy in three-phase transformer circuit model

Elleuch

Poloujadoff²

1997

IEEE Trans. Magn.

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Abstruct-In this paper, an important discussion of transformer design and modeling is given. Afterwards, the anisotropy effects of the transformer laminations have been stressed in light of the investigation of a three-phase three-limb transformer Tjoint. Three simple T-joint modeling schemes accounting for the lamination anisotropy are proposed. The fundamental result is that the flux lines remain almost parallel to the rolling direction (RD), except in a small area around the T-joint. Therefore, transformer yokes and limbs have been divided into longitudinal elements according to the RD. Reluctances related to these elements are connected according to the magnetic circuit coupling and yield a new transformer circuit model. A good agreement is obtained between computed and measured transients currents. Furthermore, the new transformer model enables some localized analysis. The computed localized fluxes and loci of flux density vectors near to the T-joint exhibit a satisfactory agreement with many results based on FEM or experimental investigations.Zndex Terms-Grain-oriented steels, transformer.

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“…In Although similar results have already been obtained using FEM analysis [22], [23], [28], [29], [44] or experiments [7], [IO], [30], [40], our approach offers the following advantages.…”

Section: Electric Modelsupporting

confidence: 73%

Anisotropy in three-phase transformer circuit model

Elleuch

Poloujadoff²

1997

IEEE Trans. Magn.

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“…4,5,[7][8][9][10][11][12][13] Though the transformer laminations use favourable <001> crystallographic direction, 'limited' use of non <001> orientations in corners may also be required. [14][15][16] The electrical laminations, both oriented 9,17) and non-oriented, 9,[18][19][20][21][22][23][24] can also be subjected to deformation (from handling, stacking, shearing and joining) for producing the actual equipment.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties in Deformed Grain Oriented Electrical Steel: On the Role of Strain Hardening Exponent and Microstructural Developments

Shekhawat

Vadavadagi

Hiwarkar³

et al. 2012

ISIJ Int.

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High permeability commercial CRGO, cold rolled grain oriented steel was subjected to uni-axial tensile strain in three principal orientations: (110) <001>, (110) < 10> and (110)< 11>. The samples exhibited remarkably different stress-strain behavior. The numerical values of the strain hardening exponent, n, largely determined the degradation in magnetic properties: namely increase in Hysteresis loss (H) and drop in Permeability (μ). Changes in magnetic properties were also correlated with microstructural observations: misorientation and dislocation density developments, relative recovery, residual strain and deviation from ideal <001>. The study established constitutive relationships between degradation in magnetic properties and various parameters of the deformed microstructures.

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“…Figure 14 shows the localized loss distribution in one of the cores. The peaks correspond to the regions where the rotational flux occurs and regions where high interlamina flux is present (19). The differences in the flux distributions in this case cause the 45 • offset Tjoint to have 10% less core loss than the other joint.…”

Section: Flux and Loss Distributions In Transformersmentioning

confidence: 92%

“…Figure 13 shows the difference in flux distribution in two commonly used T-joints (19). The locus of the fundamental component of flux density is shown.…”

Section: Flux and Loss Distributions In Transformersmentioning

confidence: 99%