A simple and general method is developed for analyzing the magnetic fields produced by power lines at distances large in comparison to the spacing between the line's phase conductors. Magnetic fields produced far from conventional power lines have remarkably simple properties. Formula for the fields produced by various conventional and unconventional power line configurations are presented. Included are line designs characterized by reduced magnetic field levels. Errors in the formulae are less than +or-10% at the edge of a typical power transmission right-of-way.
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