Analysis of electromagnetic and loss effects of sub-harmonics on transformers by Finite Element Method

Özüpak, Yıldırım; Mamiş, Mehmet Salih

doi:10.1007/s12046-020-01473-4

Cited by 10 publications

(7 citation statements)

References 10 publications

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“…Steady-state transformers are designed to operate below their saturation curves. However, when the transformers are energized, the flux rises to a high value in the saturation region with the effect of inrush current, such that the magnetizing current increases substantially [7][8][9]. Inrush current in transformers is considered a major problem in practical power systems.…”

Section: Introductionmentioning

confidence: 99%

Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System

Özüpak¹

2021

BEN

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Electronic power transformers (EPT) are transformers that are smaller in size and volume compared to conventional 50 Hz frequency transformers. Medium frequency transformers (MFT) have begun to become important components in high voltage and high power energy conversion systems such as EPTs. In this study, the electric field distribution of these transformers is discussed. The electric field distributions in the transformer have been obtained using the two-dimensional finite element method (FEM). Besides, maximum electric field intensities were obtained in the study. ANSYS@Maxwell simulation program, which realizes a solution based on FEM, was used for these analyzes. Electromagnetic field analyzes of the same transformer under normal conditions were also performed to compare the analyzes. Besides, the values obtained from the high-frequency analysis, the values obtained from the study below 50 Hz frequency, and the values obtained experimentally were compared. In this way, the stress in the insulation material of the transformer and the weak parts of the insulation material were detected. It is expected that the method used will contribute to future studies to examine the results of the electric field distribution analysis of transformers.

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Section: Introductionmentioning

confidence: 99%

Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System

Özüpak¹

2021

BEN

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“…There are two main features of this method to be useful and successful. The first is that it divides the model into a limited number of areas [7]. Second, the boundary and initial value problems to which the method is applied are formulated in a piecewise or integral form.…”

Section: Introductionmentioning

confidence: 99%

Performing Structural Design and Modeling of Transformers Using ANSYS-Maxwell

Özüpak¹

2021

BEN

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Transformers have attracted great interest since they have been used due to their robustness and application in power systems. Therefore, the nominal values of transformers grow even more in larger power systems due to the constantly increasing power demand. Many types of research are carried out to increase the performance characteristics of transformers and their compatibility with power systems. There are different methods and analysis tools for these studies. One of them is ANSYS@Maxwell, which performs analysis based on the Finite Element Method (FEM). With this program, the design, modeling, analysis, and performance evaluation of the transformer in a high-performance simulation environment can be achieved through effective strategic modeling. In this study, the design and modeling of a three-phase core-type transformer with coils and terminals are explained in detail in ANSYS @ Maxwell simulation platform. Besides, the transformer models examined were adapted using ANSYS@MAXWELL software based on the finite element method. Analyzes are performed to estimate the core-losses, leak-losses, DC-losses, and winding-eddy current losses-of transformers with this program. A large number of meshes were used in FEM analysis of 2D and 3D models to examine the losses in detail.

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“…It realizes the identification of different internal faults that cause power cuts in transformers with an algorithm and transformer model [2]. In recent years, with the development of computer software programs, different nonlinear core materials used in transformers core and simulation programs based on Finite Element Method (FEM) have been used intensively to model the permanent magnetization of these materials [3]. ANSYS @ Maxwell based on FEM was used to calculate the parameters of the model transformer in discharges occurring in the windings of transformers [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Frequency on Eddy Losses of Transformers

Özüpak

2021

International Journal of Engineering and Applied Sciences

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Transformer is a vital component of electrical power systems for transmission and distribution. Robust design to increase the efficiency of a transformer is one of the main factors in transformer manufacturing. The efficiency of a practical transformer is limited by the losses caused by design and manufacturing defects. Losses in transformers can be divided into idle losses and losses under load. Eddy current loss is obtained from the idle losses of the transformer. In this paper, the effect of eddy effect causing HV energy loss at high magnetization frequencies was investigated. ANSYS@Maxwell software based on the Finite Element Method was used to analyze the eddy current loss in a T-connected, 3-leg and 3-phase distribution transformer of 15 MVA. The losses are obtained from no-load tests by changing the operating frequency of the transformer. Depending on the frequency value in the range of 50-60 Hz, the change in eddy current loss has been observed while the transformer winding is excitation at 1.74 T magnetic flux density. It has been observed that increasing the frequency causes an increase in the no load loss in the 3-phase transformer.

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Analysis of electromagnetic and loss effects of sub-harmonics on transformers by Finite Element Method

Cited by 10 publications

References 10 publications

Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System

Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System

Performing Structural Design and Modeling of Transformers Using ANSYS-Maxwell

Effect of Frequency on Eddy Losses of Transformers

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