A Multi-Purpose Balanced Transformer for Railway Traction Applications

Author

Zhang, Zhiwen ; Wu, Bin ; Kang, Jinsong ; Luo, Longfu

Author_Institution

Coll. of Electr. & Inf. Eng., Hunan Univ., Changsha

Volume

24

Issue

2

fYear

2009

fDate

4/1/2009 12:00:00 AM

Firstpage

711

Lastpage

718

Abstract

A multi-purpose balanced (MPB) transformer is proposed in this paper for electric railway applications. The MPB transformer is developed from impedance-matching (IM) transformers widely used in China´s railway systems. The proposed MPB transformer has three main functions: (1) it provides a symmetrical two-phase voltage of 27.5 kV for railway overhead lines to power electric trains; (2) it supplies a three-phase balanced voltage of 10.5 kV for railway substations; and (3) it can accommodate a three-phase harmonic filter with improved power factor and reduced manufacturing cost. In this paper, the operating principles of the MPB transformer are elaborated, the design of the harmonic filters is discussed, and the results of computer simulations are provided. A 16-MVA MPB transformer was designed and commissioned, and real-time field measurements are provided.

Keywords

impedance matching; power factor; power harmonic filters; power overhead lines; power transformers; railway electrification; substations; traction motor drives; China railway system; apparent power 16 MVA; electric railway application; impedance-matching transformer; multipurpose balanced transformer; power factor; railway overhead line; railway substation; railway traction application; real-time field measurement; three-phase balanced voltage; three-phase harmonic filter; voltage 10.5 kV; voltage 27.5 kV; Balanced transformers; harmonic filters; railway substations; reactive power compensation; traction drives;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2008.2008491

Filename

4797805