Engineering & Consulting

Bahn 2000: High speed line Mattstetten-Rothrist (NBS)

Power study
Electromagnetic fields assessement
Test and commissioning
Electromagnetic compatibility
GSM-R and-P measurement

Power study

Using FABEL, ENOTRAC modelled the network area Bern – Olten (NBS Mattstetten – Rothrist, Grauholz, Bern, main line Bern – Zollikofen – Burgdorf – Aarburg – Olten, line upgrade Solothurn – Wanzwil) according to the Bahn 2000 plan and with additional heavy freight trains and considered:

  • Dimensioning of the overhead conductor for the NBS, the required bonds,
  • Optimised location of the feed points
  • Identification of weak points in the existing overhead wiring installations of the main line.
  • The investigation of outage scenarios and possible emergency power supply
Catenary system for the line Mattstetten - Rothristzoom
Buildung at the line branch in Wanzwilzoom

Electromagnetic fields assessment

Calculation of the electromagnetic fields with the EMFCALC tool as required by the Swiss regulation for protection against non-ionising radiation for the overhead conductor installations of the new line Mattstetten – Rothrist and the line extension Derendingen – Inkwil.
Calculation of the magnetic flux density near "places with sensitive use". Graphical representation of the fields and evaluating the compliance with the Swiss regulation. Validation of the measures taken to reduce the magnetic fields. ENOTRAC later updated the calculations based on as-built conductor positions

Magnetic flux density for an optimised arrangement of the conductorszoom

Test and commissioning

During the commissioning of the Mattstetten – Rothrist/Derendingen – Inkwil extension, ENOTRAC conducted various measurements including:

  • Electromagnetic field at sensitive locations and standard cross profiles
  • Current distribution in the overhead and return conductors as well as in the new substation in Wanzwil
  • Temperature rise in the overhead wires
  • Impedances
  • Protection functions and short circuit

The measurements were taken over a distance of 55 km and had to be completed within 5 days. This required extensive and thorough preparation and planning work. ENOTRAC defined the measurements, conducted the entire planning and coordination between various SBB departments and supervisory authorities and conducted the measurements and analysis.

Temperature probe at contact wire, messenger wire and the accordant current probeszoom
Test campaign at the commissioning of the line Mattstetten - Rothristzoom

Electromagnetic compatibility

The radio mast near the new line Mattstetten – Rothrist raised concerns about interference with the railway equipment. To assess the situation, measurements were conducted in the radio frequency range. Since the railway equipment can be a source and a victim, measurements were carried out in two phases, both in the communication radio unit and along the railway installations.

In addition to the tests themselves, ENOTRAC was responsible for the preparation, planning, and coordination between the various players (SBB, V+S and measurement technique, montena emc, radio messaging, Federal Department of Defence, armasuisse).

Antenna installation at Kernenriedzoom
Probe for disturbance measurementszoom

GSM-R and -P measurements

The masts of the GSM-R antennas in Olten and along the newly built line of Mattstetten – Rothrist, are also partially fitted with antennas belonging to public providers. According to the degree of protection against non-ionising radiation, the compliance with the safety limits had to be verified by measurements. Enotrac co-ordinated and organised the measurements.

Antenna installation along the track of Mattstetten - Rothristzoom

ENOTRAC AG, Seefeldstrasse 8, 3600 Thun, Switzerland, Tel: +41 33 346 66 11, Fax +41 33 346 66 12
ENOTRAC SA, Avenue de la Gare 1, 1003 Lausanne, Switzerland, Tel: +41 33 346 66 19, Fax +41 33 346 66 12
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