Magnetic fields around a 220-66 kV transmission line

The 1990s has witnessed growing public concern over possible adverse health effects of magnetic fields produced by generation, transmission and utilization of electric power. Numerous works examined magnetic fields emanating from conventionally designed transmission lines. This paper, in contrast, evaluates magnetic fields around a 220-66 kV, 60 km, transmission line segment specially erected in Egypt. The optimum phase arrangement of the 220 and 66 kV circuits is sought in view of the lowest peak magnetic field value. Furthermore, the mean magnetic field prevailing over a potential exposure area is determined near the line, namely, over an area extending 50 m on both sides of the line span. The effect of line disconnection on magnetic field is investigated. Being vital to human exposure assessment the variation of magnetic field underneath the line along a human height is presented and discussed