The influence of multidirectional leakage flux on transformer core losses

In this study, a medium frequency power transformer has been designed analytically and its sizes have been obtained. The transformer’s analyses were made numerically by 2D AnsysMaxwell Solver software package. The Solver has also helped to study suitable transformer core and winding samples. Unlike medium frequency transformer, which is generally driven by unipolar PWM method, the designed transformer is driven by bipolar PWM method in the study. The core losses were obtained for different core materials (Trafoperm N3 and Amorfous 2605SA1) by AnsysMaxwell numerical and analytical calculations. The calculated losses for no-load working conditions were compared with each other. The designed transformer has been analyzed for its noload and loaded working conditions magnetically. Finally, the radial and axial forces created in the windings have also been examined for loaded working condition.

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Calculation of transformer core losses with nonlinear loads

10th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.02EX630) ◽

10.1109/ichqp.2002.1221517 ◽

2004 ◽

Author(s):

L. Ran ◽

K.S. Smith ◽

Y. Liao ◽

G.A. Putrus

Keyword(s):

Nonlinear Loads ◽

Core Losses ◽

Transformer Core

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Investigating Ferroresonance Phenomenon in a Single-Phase Transformer with the Effect of Magnetic Hysteresis

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v2.i2.pp248-258 ◽

2016 ◽

Vol 2 (2) ◽

pp. 248 ◽

Cited By ~ 1

Author(s):

Behrooz Rezaeealam ◽

Behzad Norouzi

Keyword(s):

Hysteresis Loop ◽

Single Phase ◽

Magnetic Hysteresis ◽

Electrical Power ◽

The Finite Element Method ◽

The Core ◽

Core Losses ◽

Two Space Dimensions ◽

Materials Used ◽

Transformer Core

<p>Ferroresonance is a non-linear phenomenon and very dynamic in the power quality problems. This phenomenon should be carefully analyzed so that preventive measures could be taken before its appearance and prevent injury and damage to electrical power appliances. Ferroresonance is seen more in the middle-voltage networks with supplying unloaded or slightly loaded transformers by cables. The materials used in the manufacture of transformer cores are creates a major role in their dynamic behavior. In this article are used from two types magnetic material GOES and NGOES in the transformer core of single phase. The physical behavior of these materials is considered during the core hysteresis. For modeling the hysteresis loop has been used from Jiles-Atherton method. By using the finite element method and with help COMSOL Multiphysics Software, transformer is simulated in two space dimensions. Laboratory test the transformer core hysteresis loop is described and shows which the Jiles-Atherton model is one of the best known models of hysteresis. The results shows which use of GOES materials in the transformer core is cause Significant reduction the core losses in comparison with the NGOES materials. Also change of ferroresonance mode and the severity its occurrence are the results of changing the material used in the transformer core.</p>

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Measurement of the leakage flux in the vicinity of a transformer core

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

10.1108/compel-01-2019-0003 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Stéphane Duchesne ◽

Fabrice Morganti ◽

Carl Shulz ◽

Daniel Roger

Keyword(s):

Analysis Tool ◽

Content Type ◽

The Core ◽

Leakage Flux ◽

Usable Information ◽

Iron Losses ◽

Building Process ◽

The Many ◽

Transformer Core

Purpose This study presents a new method for the detection of faults in large transformer cores. It is based on the analysis of leakage flux components in the vicinity of the sheet stack. The purpose of this study is to provide a nondestructive analysis tool for transformer cores during the assembly process to detect accidental defects such as inter-laminar short circuits. Design/methodology/approach The different components of the leakage flux allow localization of the fault in the stack and also permit to assess its severity. Out of the many kinds of defects which may appear in a transformer core, this method only detects those which actually cause an increase in the transformer’s global iron losses, which are thus the most detrimental. Findings The proposed method allows a more efficient control of the quality of the cores during their manufacturing process. Until now, it was only possible to know the quality of the core when the transformer was fully assembled. Research limitations/implications The accuracy of the method depends on the size of the defect and may request many measurements to give usable information. Practical implications Controlling iron losses in a core during its construction avoids heavy dismantling operations, both financially and temporally. Originality/value This method can help transformer manufacturers optimize their building process. In addition, the method remains effective regardless of the size of the core considered.

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