Fundamental of Magnetic Field
Pp. 9-20 (12)
Electricity has gone through lots of changes since it has been in use. But, the
hazardous effects of high voltage transmission line magnetic field have always been of
deep concern to scientists. In this chapter, a mathematical modeling has been
established, by which a hundred percent mitigation at any point of consideration would
be achievable. The developed equations are also capable of producing simultaneous
reduction of magnetic field at other points within the center of the right-of-way.
First, a procedure to obtain the total magnetic field contributed by the three- phase high
voltage transmission line has been established and then the angular frequency at which
maximum magnetic field occurs is developed.
In order to achieve the mitigation, an auxiliary mitigating loop has been implemented
and the required equation to calculate the mitigating magnetic field is developed. The
optimum value of this loop impedance is set. Since the designed auxiliary mitigating
loop is of passive type, no especial feedback equipments are needed to compensate for
the changes of the load currents.
In order to illuminate the capability of the developed equations a flat configuration of
230 KV transmission line has been utilized.