Building Factor of Grain-Oriented Silicon Iron (3% SiFe) with Different Thickness on 100kVA Three Phase Distribution Transformer Core

Ashbahani, N.; Daut, I.; Yusoff, Mohd Irwan

doi:10.4028/www.scientific.net/AMR.488-489.537

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HomeAdvanced Materials ResearchKey Engineering Materials IIBuilding Factor of Grain-Oriented Silicon Iron (3%...

Building Factor of Grain-Oriented Silicon Iron (3% SiFe) with Different Thickness on 100kVA Three Phase Distribution Transformer Core

Abstract:

The power loss in laminated transformer cores is always greater than the nominal loss of the electrical steel laminations, by a factor known as the building factor. This paper discussed result of an investigation towards the effect of using two different Grain-Oriented Silicon Iron (3%SiFe) materials to the 100kVA three phase distribution transformer. The thicknesses of the material that have been used in this research are 0.23mm and 0.27mm. The transformer core will be assembled with 60o T-joint with 5mm mitred corner overlap length. Power loss has been measured using no-load test with 29 layer of lamination while nominal loss measured using Epstein test frame. At the operation mode flux density, 1.5T, the building factor of the transformer model core material with 0.23mm thickness is 1.219 while with the building factor for 0.27mm thickness is 1.250. This shows that thinner transformer core lamination is better than the other one by 2.5% during operation mode.

Info:

Periodical:

Advanced Materials Research (Volumes 488-489)

Main Theme:

Key Engineering Materials II

Edited by:

Wu Fan

Pages:

537-541

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.488-489.537

Citation:

N. Ashbahani et al., "Building Factor of Grain-Oriented Silicon Iron (3% SiFe) with Different Thickness on 100kVA Three Phase Distribution Transformer Core", Advanced Materials Research, Vols. 488-489, pp. 537-541, 2012

Online since:

March 2012

Authors:

N. Ashbahani, I. Daut, Mohd Irwan Yusoff

Keywords:

Building Factor, Grain-Oriented Silicon Iron, M4, Transformer Core

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References

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DOI: https://doi.org/10.1049/piee.1965.0360

[2] teNyenhuis, E., Mechler, G.F., & Girgis, R.S. (2001). Other factors contributing to the core loss performance of power and distribution transformers. IEEE Transaction on Power Delivery, 16, 648-653.

DOI: https://doi.org/10.1109/61.956752

[3] Daut, I. (1991). Investigation of flux and loss distribution in transformer cores assembled from amorphous powercore materials. Dissertation. University of Wales, Cardiff.

[4] Pfutzner, H., & Schonhuber, P. (1991). Flux distributions analysis in a mitred transformer core corner. Journal of Magnetism and Magnetic Materials. 101, 86-66.

DOI: https://doi.org/10.1016/0304-8853(91)90686-5

[5] Moses, A. J, & Thomas, B. (1974). Problems in the design of power transformers. IEEE Transaction on Magnetics, 10, 148-150.

Paper TitlePages

Evaluation of DC Brush-Less Motors Using Powder Magnetic Cores

Authors: Katsuhiko Mori, Ryoji Nakayama, Kinji Kanagawa

Abstract: A high-speed motor and a DC brush-less motor for factory automation (FA) were made to investigate the applicability of the powder magnetic core to motor application. The performances of these motors were compared with the similar motors having conventional electromagnetic steel core. Although the permeability and saturated magnetization of powder magnetic core were less than those of electromagnetic steel core, the output performances of each core motor were almost the same. The FA motor with powder magnetic core using three-dimensional magnetic circuit showed higher torque than the electromagnetic steel core motor with the same volume.

1317

Test Results of SMC Cores as Some Types of Motor Cores

Authors: Kazuo Asaka, Chio Ishihara, Yuuji Enomoto, Motoya Ito

Abstract: Recently, SMC(Soft Magnetic Composite) materials were studied for their applications in many fields. We have developed a superior SMC for use as motor cores and are studying their applying effects [1]. It shows almost the same motor output power as laminated Si-steels of 0.35mm in thickness, although core loss of SMC is about 1.5 times that of the laminations. As shown in the results, the SMC motor core is sufficient for real use as a motor core. Furthermore, a 3-D shaped motor core made of SMC can improve approximately 20% of the output compared with the same size motor made of laminations.

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Electromagnetic Analysis and Comparison of Conventional-Wound Cores and Octagonal-Wound Cores of Distribution Transformers

Authors: I. Hernández, J.M. Cañedo, J.C. Olivares-Galván, Pavlos S. Georgilakis

Abstract: This paper presents comparative results of an electromagnetic study performed in two different wound core transformer configurations in order to know the best configuration that reduce excitation current and core losses. The results show that octagonal wound-core (OWC) reduces the excitation current and eddy-current losses with respect conventional-wound core (CWC). The results were obtained applying 2D and 3D FEM simulations, taking into account the non-linear properties of the core. In the last part of this paper, several grades of grain oriented electrical steels and the combination of them are analyzed to find the best mixing percentage to reduce eddy-current losses and excitation current.

477

Analysis for Temperature Rise of a Three-Phase Four Limbs Transformer by Soil Structure with DC Bias

Authors: Yong Ming Yang, Xing Mou Liu, Xu Duan

Abstract: In this paper, a method for earth potential computation of layered soil structure is discussed. To calculate thermal field of the transformer with dc bias, simulation models using MAXWELL and COMSOL are proposed. Based on the electromagnetic analysis, electric power loss resulted in temperature rise is calculated. Under the case of normal operation of transformer, a research was carried out to compare the abnormal changes of temperature of transformer. It worked out that if there are different DC parts in transformer, the loss will increase with DC bias and the temperature of transformer core will also increase. If it is increasing continuously and no preventive measures are taken soon, the thermal aging of some parts in transformer will speed up and gradually affect the normal operation of transformer. The research lays the groundwork for further research of transformer DC bias and aging.

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