Amorphous alloy core distribution transformers

H.W. Ng; R. Hasegawa; A.C. Lee; L.A. Lowdermilk

doi:10.1109/5.118984

Core Stress Analysis of Amorphous Alloy Transformer for Rail Transit under Different Working Conditions

Energies ◽

10.3390/en14010164 ◽

2020 ◽

Vol 14 (1) ◽

pp. 164

Author(s):

Jianwei Shao ◽

Cuidong Xu ◽

Ka Wai Eric Cheng

Keyword(s):

Amorphous Alloy ◽

Working Conditions ◽

Short Circuit ◽

Element Model ◽

Operating Conditions ◽

Iron Core ◽

Rail Transit ◽

Transit System ◽

The Core ◽

Distribution Transformers

The rail transit system is a large electric vehicle system that is strongly dependent on the energy technologies of the power system. The use of new energy-saving amorphous alloy transformers can not only reduce the loss of rail transit power, but also help alleviate the power shortage situation and electromagnetic emissions. The application of the transformer in the field of rail transit is limited by the problem that amorphous alloy is prone to debris. this paper studied the stress conditions of amorphous alloy transformer cores under different working conditions and determined that the location where the core is prone to fragmentation, which is the key problem of smoothly integrating amorphous alloy distribution transformers on rail transit power supply systems. In this study, we investigate the changes in the electromagnetic field and stress of the amorphous alloy transformer core under different operating conditions. The finite element model of an amorphous alloy transformer is established and verified. The simulation results of the magnetic field and stress of the core under different working conditions are given. The no-load current and no-load loss are simulated and compared with the actual experimental data to verify practicability of amorphous alloy transformers. The biggest influence on the iron core is the overload state and the maximum value is higher than the core stress during short circuit. The core strain caused by the side-phase short circuit is larger than the middle-phase short circuit.

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Design Optimization Procedure for Amorphous Core Distribution Transformers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.721.159 ◽

2012 ◽

Vol 721 ◽

pp. 159-164

Author(s):

Eleftherios I. Amoiralis ◽

Marina A. Tsili ◽

Antonios Kladas

Keyword(s):

Energy Efficiency ◽

Amorphous Alloy ◽

Design Optimization ◽

Optimization Procedure ◽

Significant Benefit ◽

Design Practice ◽

Comparison Of Results ◽

Distribution Transformers ◽

Installation Cost ◽

Selection Of

The paper presents a design optimization procedure appropriate for distribution transformers with amorphous alloy cores. Several considerations and the main differences from the design practice of conventional transformers are presented and discussed in detail. Moreover, comparison of results present the significant benefit in the transformer energy efficiency by the selection of amorphous alloy core, despite its initial higher installation cost.

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The New Development Trend of Distribution Transformer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.672-674.831 ◽

2014 ◽

Vol 672-674 ◽

pp. 831-836 ◽

Cited By ~ 1

Author(s):

Yun Cai Lu ◽

Li Wei ◽

Wei Chao ◽

Wu Peng

Keyword(s):

Amorphous Alloy ◽

Energy Saving ◽

Reactive Power ◽

New Technology ◽

Development Trend ◽

Low Noise ◽

Distribution Grid ◽

Distribution Transformer ◽

Technology Application ◽

Distribution Transformers

Firstly, this paper introduces the development of new materials, new technology and new manufacture in power industry of China, energy-saving, low noise and smart distribution transformers are widely used in countryside power grid reconstruction. In this paper, application status and development trend of different types of distribution transformers were introduced and compared in terms of new material and new structure, such as oil-immersed distribution transformer, amorphous core transformer(AMT), dry-type transformer, SF6 insulated distribution transformer, composite transformer and other types of distribution transformers. The development of distribution transformer is mainly based on energy saving, miniaturization, wound core and amorphous alloy nowadays, but the class-H dry-type transformer and tridimensional toroidal-core amorphous alloy transformer are the future direction of development. The technology application of smart distribution grid, power electronics technology and dynamic reactive power compensation technique will also affect the safety and economic operation of distribution transformer.

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