INITIAL CORROSION SURVEY OF THE BAY AREA RAPID TRANSIT SYSTEM

The 75-mile (120-km) Bay Area Rapid Transit System has a dc traction power supply that uses the continuously welded steel running rails for its negative current return. The rails are mounted on insulating fasteners to minimize leakage current. However, high values of stray current have been measured during the initial operation of the system. Testing has demonstrated that the negative return grounding at traction substations and its interconnection with other grounding has been the major cause of stray earth currents. An alternate method of negative return grounding through diodes has been tested and is being installed. The diodes block exchange currents, but allow leakage and fault current return to the traction rectifiers.

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 45-49
  • Monograph Title: Corrosion and corrosion protection
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00072459
  • Record Type: Publication
  • ISBN: 0309022908
  • Report/Paper Numbers: Number 501
  • Files: TRIS, TRB
  • Created Date: Dec 13 1981 12:00AM