Continuity of power supply is very important for an underground railway particularly during the frequent very short peak periods. For this reason, when designing substations it is essential to carry out detailed investigations concerning power requirements, trend of power requirements and the peak loads likely to occur. Planning of the power supply system and the overall protection concept has to be guided by the operational load peaks. A problem which plays only a subordinate role in surface transport is the temperature rise of the air in the tunnel, resulting from energy losses and braking energy of the traction vehicles. Thus, the question of current recovery during braking cannot be solved solely from the viewpoint of economy with the cost of energy as parameter. Here it is also necessary to settle the questions of pollution control in the tunnel and the cost of ventilating the tunnel. The power consumption and the possible peak loads were calculated on the basis of the Sao Paulo Metro's envisaged timetable. This study showed that it must be possible to feed the energy back into the ac system if economical operation is to be guaranteed. The following substations are envisaged for distribution and transformation of the energy required: 3 transformer substations 88/22 kv; 10 rectifier substations for 22 kv, 850 v dc (two of which are equipped with static braking inverters; and 20 systems supplying power to the passenger stations, 22/0.48 kv.

  • Corporate Authors:

    Brown Boveri and Company Limited

    Publicity Department
    Baden,   Switzerland 
  • Authors:
    • Spatny, W
  • Publication Date: 1978-12

Media Info

  • Pagination: p. 840-847
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196937
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Aug 15 1981 12:00AM