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Berlin Environmental Atlas

08.05 Electromagnetic fields

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Map 08.05.9: Magnetic flux density by the S-Bahn Track (0 Hz, constant field) at Savignyplatz

When considering the constant magnetic field at Savignyplatz station and in the vicinity of the S-Bahn track, we must remember that it is derived from peak traction currents. The peak field strengths calculated for people waiting on the platform were 79 µT (0 Hz, constant field)

The average magnetic flux densities are at least one magnitude lower. By the viaduct at 1 m above ground level, maximum flux density is 25.8 µT (0 Hz).

The magnetic flux densities measured in the trains are a magnitude higher than those below the viaduct, as fields at rail installations also decrease rapidly with distance. Even lower electromagnetic emissions can only be expected from highly sophisticated transport systems such as the maglev train Transrapid 07 planned to run between Berlin and Hamburg (Stenzel, Plotzke 1996).

A comparison of magnetic flux densities induced by high-voltage overhead lines and those in the vicinity of S-Bahn and railroad tracks present basic difficulties. The flux densities at S-Bahn installations may be greater than those of 50 Hz power supply, but they are a long way from exceeding the index values, as IRPA/ICNIRP recommend a maximum threshold of 40 mT (= 40,000 µT) for constant magnetic fields and the 26th BImSchV does not define any limits at 0 Hz. All the same, in the immediate vicinity there are often EMT disturbances that can only be eliminated by magnetic shielding (Naunheim 1991) for the affected devices.

Tab. 5 summarises the most important measurements and calculations. Field strengths are classified by frequencies (0, 16 2/3 and 50 Hz) and represent either average or peak values, depending on the case.

Tab. 5: Summary of Key Measurements and Calculations

[Table is also available as Excel-File (MS-Excel is required).]

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