TURN-OFF CIRCUIT IMPROVES POWER FACTOR OF THYRISTOR CONTROL

Experiments carried out in cooperation with the German Federal Railway have demonstrated the feasibility of a new form of thyristor control devised by AEG-Telefunken. The effect is to improve the power factor for a thyristor-controlled locomotive, normally between 0.75 and 0.8, to between 0.9 and 0.95. Reactive power is thus reduced by about 50 percent. By addition of a quenching or turn-off circuit similar to those used in chopper control schemes for d.c. traction, the conduction period during which the thyristor is turned on can be arranged to lie centrally within the voltage half-wave, so that current and voltage are more nearly in phase. It is even possible to obtain a leading power factor if this is considered desirable.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03735346
• Corporate Authors:

  IPC Transport Press, Limited

  Dorset House, Stamford Street
  London SE1 9LU,   England 
• Publication Date: 1975-11

Media Info

• Pagination: p. 428
• Serial:
  • Railway Gazette International
  • Publisher: DVV Media Group
  • ISSN: 0373-5346
  • Serial URL: http://www.railwaygazette.com/about-us.html

Subject/Index Terms

• TRT Terms: Economic efficiency; Electric locomotives; Power factor (Electricity); Railroad electrification; Thyristors
• Uncontrolled Terms: Efficiency
• Old TRIS Terms: Power factor
• Subject Areas: Economics; Railroads;

Filing Info

• Accession Number: 00153071
• Record Type: Publication
• Source Agency: Federal Railroad Administration
• Files: TRIS, USDOT
• Created Date: May 31 1977 12:00AM