MAGNETIC-FIELD REDUCTION USING HIGH PHASE ORDER LINES

Ground level electric, and more recently magnetic, fields from overhea d power transmission lines are increasingly important considerations i n right of way specification, with states setting or planning to set e dge of right of way limits. Research has been conducted in high phase order power transmission wherein six or twelve phases are used to tran smit power in less physical space and with reduced electrical environm ental effects than conventional designs. The first magnetic field test ing, as reported in this paper, has verified predictive methods for de termination of magnetic fields from high phase order lines. Based on t hese analytical methods, field profiles have been determined for lines of different phase order of comparable power capacity. Potential adva ntages of high phase order as a means of field mitigation are discusse d.