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Different techniques for the reduction of the magnetic field arising from either overhead lines or buried cables are presented, based on the use of active conductors for the compensation. The optimal choice of the currents to be driven in the compensation wires is attained by means of a genetic algorithm, which compares favourably with deterministic algorithms in terms of accuracy and computational costs. The procedure may be applied to any kind of source configuration, with appropriate modifications, ensuring significant magnetic field reductions. 1 Introduction Increasing attention is actually devoted to the magnetic field levels due to power lines either in the overhead and cable configuration. Various mitigation strategies are available and are generally applied and experienced at the design stage, while the possibilities of achieving a real reduction strongly reduce when existing installations are dealt with. One of the most attractive technologies applicable to already realized power lines relies on the so-called active shielding [1], which consists in the design of antagonist sources capable of generating, in a given region, a magnetic field almost opposite to that of the original source. Such a compensation can be achieved only in the average sense, however a considerable reduction is generally possible at reasonable costs. It should be noted, in fact, that passive shielding technologies based on the use of panels realized by means of conductive and/or ferromagnetic are often not

Magnetic field reduction by means of active shielding techniques