Low hazard extremely low frequency power transmission line

Electrical transmission or interconnection systems – Anti-induction or coupling to other systems – Magnetic or electrostatic field control

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174 32, 174 40R, 307147, H02G 720

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active

050685430

ABSTRACT:
Potentially harmful electromagnetic radiation associated with high voltage power transmission lines is reduced or minimized by splitting the current delivered to a load between at least three conductors, and by maintaining a specific spatial relationship between the respective conductors. Single phase transmission at reduced radiation may occur using three or four conductors spatially positioned, as viewed in a cross sectional plane, in a horizontal line or a rectangular array, respectively. Three phase transmission at reduced radiation may occur using five or six conductors spatially positioned in the corners of a rectangular array, with one conductor in the center, or a hexagonal array, respectively.

REFERENCES:
patent: 1190135 (1916-07-01), Faccioli
patent: 1625125 (1927-04-01), Latour
patent: 2008109 (1935-07-01), Reher
Comber, et al., "Audible-Noise Reduction by Bundle Geometry Optimization", Proc. of IEEE Power Engineering Society, Jan. 28-Feb. 2, 1973, New York, pp. 1782-1789 (published Nov. 20, 1972).
Marino, et al., "Hazard at a Distance: Effects of Exposure to the Electric and Magnetic Fields of High Voltage Transmission Lines", Medical Research Engineering, vol. 12, No. 5, pp. 6-9 (Nov. 1977).
Rish, et al., "Regulating Possible Health Effects from AC Transmission Line Electromagnetic Fields", Proc. of the IEEE, vol. 67, No. 10, pp. 1416-1427 (Oct. 1979).
Amano, et al., "Study on Reduction in Electric Field, Charged Voltage, Ion Current and Ion Density under HVDC Transmission Lines by Parallel Shield Wires", IEEE Transactions on Power Delivery, vol. 4, No. 2, pp. 1351-1357 (Apr. 1989).
Transmission Line Reference Book HVDC to +600 kv, Chapter 7, pp. 73-96 (Electric Power Research Institute).
Electromagnetic Fields: The Jury's Still Out, IEEE Spectrum (Aug. 1990).
North County Report, Times Advocate, Sunday, Jul. 29, 1990.
Harvard Medical School Health Letter, Aug. 1990.

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