COMPARISON OF SCOTT AND LEBLANC TRANSFORMERS FOR SUPPLYING UNBALANCED ELECTRIC RAILWAY DEMANDS

This paper presents a comparison of Scott and Leblanc transformers for supplying unbalanced electric railway demands mainly from the point of view of voltage imbalance. Feeding traction loads from the public power system may lead to some voltage imbalance on the latter and consequently affect the operation of its power supply system and other equipment connected with it. A Scott connection transforming a three-phase to a two-phase supply (or two single-phase supplies) can reduce the degree of the voltage imbalance due to large unbalanced railway demands and therefore is adopted in some railway power supply systems, particularly in systems with small short-circuit capacity. A Leblanc connection has the same effect but has not gained the same popularity as the Scott connection and is by no means so well known. The equivalent loads and formulas for estimating the voltage imbalance for these two connections are derived and compared in this paper.

• Corporate Authors:

  Elsevier Science S.A.

  P.O. Box 564
  CH-1001 Lausanne 1,   Switzerland 
• Authors:
  • Chen, T-H
• Publication Date: 1994

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 235-240
• Serial:
  • ELECTRIC POWER SYSTEMS RESEARCH
  • Volume: 28
  • Publisher: Elsevier Science S.A.

Subject/Index Terms

• TRT Terms: Electric power supply; Electric railroads; Measurement; Transformers; Voltage
• Uncontrolled Terms: Equivalent
• Old TRIS Terms: Voltage measurement
• Subject Areas: Energy; Railroads;

Filing Info

• Accession Number: 00669351
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 14 1994 12:00AM