Hazard analysis for magnetic induction from electric transmission lines

The potential hazard of magnetic induction from electric transmission lines was investigated. A literature search was accomplished, measurements were made and compared with the theories found in the literature and a new approach was developed for estimating the hazardous potential of magnetically induced voltage in fences which could be grasped by barefoot children under wet conditions. Conditions under which representative transmission lines could induce such voltage were explored. For example, a standard three-phase horizontal 500 KV transmission line carrying 1000 A was estimated to induce 10.5 V in a 900 M fence 30 M from the center of the line. It was also found that third harmonic currents can magnetically induce significant voltages compared to those induced by 60 HZ currents umder some circumstances.