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345 kV power transmission line

Belongs to:
Overhead power transmission line

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]


  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.