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380 kV to 420 kV underground cable

Belongs to:
Underground and sea cables
Description:

380 kV underground cables are primarily used in Germany, Austria or Switzerland for the transmission of energy or information over short distances. In America, Africa or Asia, where the transmissions paths are several hundred km long, 380 kV are not advisable due to their high idle power.

Similar to the power transmission lines, the specification of 380 kV determines a nominal voltage that is often used in Germany. At maximum capacity, voltages up to 420 kV are transmitted. Abroad, 400 kV is often given as the nominal voltage.

Frequency ranges:
  • 50 Hz
Type of field:
magnetic

Measurements (acc. to literature)

380 kV
Measurand Value Feature Remarks
magnetic flux density 0.007 µT (maximum, measured) Germany at a distance of 400 m when buried at a depth of 1.5 m during normal operation [1]
magnetic flux density 0.03 µT (maximum, measured) Germany at a distance of 200 m when buried at a depth of 1.5 m (during normal operation) [1]
magnetic flux density 0.1 µT (maximum, measured) Germany at a distance of 74 m [2]
magnetic flux density 0.101–0.17 µT (maximum, measured) Germany at a distance of 20 m [2]
magnetic flux density 0.101 µT (maximum, measured) Germany 1 m above ground at a distance of 20 m [2]
magnetic flux density 0.16 µT (mean, measured) Germany at a distance of 20 m and a height of 1 m [2]
magnetic flux density 0.184 µT (maximum, measured) Germany 1 m above ground and a distance of 10 m [2]
magnetic flux density 0.386 µT (maximum, measured) Germany at a height of 0.2 m directly over the route [2]
magnetic flux density 0.494 µT (mean, measured) Germany at a distance of 10 m and a height of 1 m [2]
magnetic flux density 3.107 µT (mean, measured) Germany at the lines at a height of 1 m [2]
magnetic flux density 56.32 µT (maximum, measured) Germany 1 m above ground when buried in 1.5 m depth during normal operation [1]
magnetic flux density 91.33 µT (maximum, measured) Germany 0.2 m above ground when buried in 1.5 m depth during normal operation [1]
400 kV
Measurand Value Feature Remarks
magnetic flux density 200 µT (measured) Great Britain on the floor over the cable [3]

References

  1. Hofmann L et al. (2012): [BMU study "Environmental Impacts of 380-Kv-Cables and HVDC-Cables" - Report of the Workgroup on Technology/Economy]
  2. Neitzke HP et al. (2010): [Determination and comparison of electric and magnetic field exposures emitted by underground and overhead power lines - project 3608S03011]
  3. Allen SG et al. (1994): Review of Occupational Exposure to Optical Radiation and Electric and Magnetic Fields with Regard to the Proposed CEC Physical Agents Directive. NRPB·R265