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10 kV to 72.5 kV underground cables

Belongs to:
Underground and sea cables
Description:

10 kV to 72.5 kV underground cables are primarily used in Great Britain. In general, underground calbes transmit energy or information over short distances. In America, Africa or Asia, where the transmissions paths are several hundred km long, 10 kV to 72.5 kV are not advisable due to their high idle power.

Frequency ranges:
  • 50 Hz
Type of field:
magnetic

Measurements (acc. to literature)

11 kV
Measurand Value Feature Remarks
magnetic flux density 0.06 µT (calculated) Great Britain at a distance of 20 to the center and a height of 1 m above ground; installation depth: 0.5 m [1]
magnetic flux density 0.11 µT (calculated) Great Britain at a distance of 10 m from the center and a height of 1 m above ground; installation depth: 0.5 m [1]
magnetic flux density 0.22 µT (calculated) Great Britain at a distance of 5 m to the center and a height of 1 m above the ground; installation depth: 0.5 m [1]
magnetic flux density 0.75 µT (calculated) Great Britain at a height of 1 m above ground at the center of the underground cables; installation depth: 0.5 m [1]
33 kV
Measurand Value Feature Remarks
magnetic flux density 0.07 µT (calculated) Great Britain at a distance of 20 m to the center and a height of 1 m above ground; installation depth: 0.5 m [2]
magnetic flux density 0.15 µT (calculated) Great Britain at a distance of 10 m to the center of the lines and a height of 1 m above ground; installation depth: 0.5 m [2]
magnetic flux density 0.29 µT (calculated) Great Britain at a distance of 5 m to the center and a height of 1 m above ground; installation depth: 0.5 m [2]
magnetic flux density 1 µT (calculated) Great Britain at a height of 1 m above ground at the center; installation depth: 0.5 m [2]

References

  1. National Grid (UK): www.emfs.info - 11 kV underground cables: magnetic fields
  2. National Grid (UK): www.emfs.info - 33 kV underground cables: magnetic fields