Abstract
This work examines some possible design measures for reducing magnetic fields generated
outside high voltage power objects, such as substations and transmission lines. These
measures include changing the suspension height, the distance between phases, and
alternating the arrangement of phase conductors. For conducting comparisons of the measures,
a well-known mathematical model based on the Biot-Savart law is used. The total magnetic
field results in a geometric sum of the horizontal and vertical components of each phase. The
efficiency of measures implementation at the design stage is considered on example power
transmission lines of different configurations (horizontal and non-horizontal, single, and
double circuit), types of voltage (110, 330, 400 kV), as well as low and high voltage busbars
of typical projects of 110/10(6) kV power substations in Ukraine. It is shown that changing
the construction of phases generally provides effective magnetic (as well as electric) field
reduction in proximity to and far away from power objects. However, this solution is not
considered suitable, as it would be restricted by the requirements of guidelines associated with
providing safety and convenience of repair work at power substations as well as the swinging
of cross wires and the provision of minimum air clearances at power lines. Furthermore, it
would require an increase in cost for its implementation due to complications arising from
tower and phase constructions. Therefore, in our opinion, magnetic field reduction measures
connected with changing the phase sequence of conductors, in addition to local active and
passive shielding, are of unique importance.
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