EFFECTS OF CONDUCTOR SAG ON SPATIAL-DISTRIBUTION OF POWER-LINE MAGNETIC-FIELD

Traditional extremely low frequency (ELF) magnetic field computation t echniques assume that the current carrying power line conductors are s traight horizontal wires. This assumption results in a model whose mag netic fields are distorted from those produced In reality. An exact so lution and an approximation are proposed for modeling magnetic fields produced by the sagged conductors of power lines, by taking advantage of the fact that the equation of the catenary exactly describes the li ne sag. The proposed approaches differ in the required computational b urden and in the precision of the results. A field mapping measurement example illustrates the applicability and the need for this analysis. The relative importance of the catenary effect is discussed.