Title :
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
fDate :
4/1/2009 12:00:00 AM
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;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2008.2008491
