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345 kV power transmission line

Belongs to:
Overhead power transmission line
Description:

345 kV overhead power lines belong to the extremely high voltage level and are primarily used in North America and Asia. 345 kV transmission lines are operated with three-phase alternating current.

Frequency ranges:
  • 50–60 Hz
Type of field:
electric and magnetic

Measurements (acc. to literature)

345 kV
Measurand Value Feature Remarks
magnetic flux density 0.1 µT (maximum, measured) USA at a distance of 100 m [1]
magnetic flux density 0.45 µT (maximum, measured) USA at a distance of 50 m [1]
magnetic flux density 0.61 µT (maximum, measured) Taiwan during an on-the-spsot measurement [2]
magnetic flux density 0.63 µT (maximum, measured) Taiwan averaged over 30 min [2]
magnetic flux density 0.64 µT (maximum, measured) Taiwan averaged over 24 h [2]
magnetic flux density 6 µT (maximum, measured) USA directly beneath the power lines [1]

References

  1. Kaune WT (1993): Assessing human exposure to power-frequency electric and magnetic fields
  2. Ger WJ et al. (2007): Accuracy of short-term residential measurement in the prediction of 72-h exposure to power frequency magnetic field in households very close to high-tension transmission lines