ARTIFICIAL NOISE DUE TO DC (DIRECT CURRENT) ELECTRIC TRAINS

The current distribution in a DC railway and the resulting magnetic effects have been modelled using the parameters of the DC railway networks in Italy. The results show that the magnetic perturbations are substantially high in the vicinity of electrified railway lines. The order of magnitude of the induced field can be as significant as approx. 40nT at a distance of approx. = 2km from the railway line indicating that geophysical techniques that employ natural magnetic anomalies can be badly effected, within this range. The magnetic effects rapidly decay with increasing distance, but the noise level could be significant even at a range of approx. 10km. Also, these induced anomalies vary significantly with the conductivity of the ground. When the conductivity is high it is possible that the railway currents dispersed through the ground interact with those induced in the earth, causing a severe disruption to the telluric measurements. (Author)

• Corporate Authors:

  International Centre for Theoretical Physics

  Trieste,   Italy 
• Authors:
  • Senanayake, W E
• Publication Date: 1987-8

Media Info

• Pagination: 44 p.

Subject/Index Terms

• TRT Terms: Direct current; Electric railroads; Electromagnetic interference; Interference
• Old TRIS Terms: Noise, spurious signals
• Subject Areas: Highways; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00480584
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: IC-87/222
• Files: TRIS
• Created Date: Mar 31 1989 12:00AM