Magnetic Field Shielding Of Underground Power
Cables In Urban Areas: A Real-life Example
Author(s)
L. Battistelli, A. Geri & G. M. Veca
Abstract
In this paper the authors propose a parametric analysis of a typical 150 kV
underground power cable line laid in urban areas. A coupled electro-magnetic
and thermal formulation based on a finite element model (FEM) has been
applied to estimate the magnetic pollution due to trefoil configuration or flat
configurations at the thermal operating limit of the cables (cable ampacity). We
also investigate the performances of open or closed shields, made of conductive
and/or magnetic materials, in order to reduce the magnetic pollution due to
existing or new installations, imposing as limitation the maximum admissible
operative temperature of the cables. The influence of the effective operating
conditions on the magnetic pollution generated by the power line has also been
investigated. The proposed formulation takes into account the real geometrical
dimensions and the effective physical characteristics of the involved materials.
Keywords: finite element model, coupled electro-magnetic-thermal problem,
low-frequency magnetic field, magnetic pollution, shielding.
1 Introduction
During the last decade, the interest in power-frequency magnetic field
calculation and shielding is growing due to the increasing concern of possible
biological effects of electromagnetic fields on human health. These effects
appear to cause or promote certain forms of leukaemia and brain tumours, as
suggested by recent epidemiological studies focused on power-frequency
magnetic fields. For this reason, in several countries, public concern has
probably incited the Regulatory Standards to fix, for the maximum magnetic flux
density value, more restrictive limits with respect to the human exposure.
Keywords
finite element model, coupled electro-magnetic-thermal problem,low-frequency magnetic field, magnetic pollution, shielding
Related Book
Other papers in this volume
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