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500 kV to 765 kV power transmission line

Belongs to:
Overhead power transmission line
Description:

500 kV - 765 kV transmission lines belong the extremely high voltage level and are operated with three-phase alternating current.

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

Measurements (acc. to literature)

500 kV
Measurand Value Feature Remarks
electric field strength 40 V/m (maximum, measured) USA at a distance of 500 m [1]
electric field strength 152 V/m (maximum, measured) USA at a distance of 200 m [1]
electric field strength 521 V/m (maximum, measured) USA at a distance of 100 m [1]
electric field strength 1.078 kV/m (maximum, measured) USA at a distance of 50 m [1]
electric field strength 1.525 kV/m (maximum, measured) USA beneath the power lines [1]
current density 2.8 mA/m² (maximum, measured) USA at a distance of 0.5 m [2]
magnetic flux density 0.14 µT (measured) USA at a distance of 91.44 m for average usage [3]
magnetic flux density 0.3 µT (measured) - at a distance of 91.44 m for peak usage [3]
magnetic flux density 0.32 µT (measured) USA at a distance of 60.96 m for average usage [3]
magnetic flux density 0.67 µT (measured) USA at a distance of 60.96 m for peak usage [3]
magnetic flux density 0.6971–1.7119 µT (measured) USA at a distance of 60.96 m; measured value is depedent on the type of pylon [1]
magnetic flux density 1.3 µT (measured) USA at a distance of 30.48 m for average usage [3]
magnetic flux density 1.4948–6.8437 µT (measured) USA at a distance of 30.48 m; measure value dependent on the type of pylon [1]
magnetic flux density 1.8–8.1 µT (maximum, measured) Japan range of values results from the measurement of two different power lines at 50 Hz [4]
magnetic flux density 1.804–2.579 µT (maximum, measured) Egypt under the tower at a height of 120 cm [5]
magnetic flux density 1.831–2.388 µT (maximum, measured) Egypt under the tower at a height of 180 cm [5]
magnetic flux density 1.831–2.619 µT (maximum, measured) Egypt under the tower at a height of 80 cm [5]
magnetic flux density 2–3 µT (measured) Japan range of values results from the measurement of two different power line types at 60 Hz [4]
magnetic flux density 2.647 µT (maximum, measured) USA at a distance of 500 m [1]
magnetic flux density 2.7 µT (measured) USA at a distance of 30.48 m for peak usage [3]
magnetic flux density 2.9 µT (measured) USA at a distance of 15.24 m for average usage [3]
magnetic flux density 6.2 µT (measured) USA at a distance of 15.24 m for peak usage [3]
magnetic flux density 14.221 µT (maximum, measured) USA at a distance of 200 m [1]
magnetic flux density 36.81 µT (maximum, measured) USA at a distance of 100 m [1]
magnetic flux density 45.997–23.5143 µT (measured) USA at a distance of 15.24 m; measured value dependent on type of pylon [1]
magnetic flux density 58.609 µT (maximum, measured) USA at a distance of 50 m [1]
magnetic flux density 71.401 µT (maximum, measured) USA beneath the power lines [1]
Measurand Value Feature Remarks
magnetic flux density 10.0377–39.1559 µT (measured) - beneath the power lines; measured value dependent on type of pylon [1]
735 kV
Measurand Value Feature Remarks
magnetic flux density 0.17 µT (maximum, measured) Canada at a distance to the lines [6]
magnetic flux density 0.33 µT (mean, calculated) Canada geometric mean value at a distance of 60 - 88 m to the lines [7]
magnetic flux density 0.38 µT (mean, measured) Canada geometric mean at a distance between 60 - 88 m [7]
magnetic flux density 0.71 µT (maximum, measured) Canada near the lines [6]
765 kV
Measurand Value Feature Remarks
electric field strength 7 kV/m (maximum, measured) USA beneath the power lines [8]
magnetic flux density 15 µT (maximum, measured) USA beneath the power lines [9]

References

  1. Farag AS et al. (1997): Impact of electromagnetic field management on the design of 500 kV transmission lines.
  2. National Research Council (1997): Possible health effects of exposure to residential electric and magnetic fields.
  3. EPA (1992): EMF in your Environment- Magnetic Field Measurements of Everyday Electrical Devices.
  4. Miyaji Y et al. (2014): Evaluation of magnetic field generated by power facilities in accordance with IEC 62110.
  5. Hamza A (2005): Evaluation and measurement of magnetic field exposure over human body near EHV transmission lines.
  6. Levallois P et al. (1999): Comparison between personal exposure to 60 Hz magnetic fields and stationary home measurements for people living near and away from a 735 kV power line.
  7. Turgeon A et al. (2004): Experimental validation of a statistical model for evaluating the past or future magnetic field exposures of a population living near power lines.
  8. Bindokas VP et al. (1988): Mechanism of biological effects observed in honey bees (Apis mellifera, L.) hived under extra-high-voltage transmission lines: implications derived from bee exposure to simulated intense electric fields and shocks.
  9. Tenforde TS (1992): Biological interactions and potential health effects of extremely-low-frequency magnetic fields from power lines and other common sources.