Magnetic Field Mitigation at Power Frequency: Design Principles and Case Studies

Bavastro, Davide; Canova, Aldo; Freschi, Fabio; Giaccone, Luca; Manca, Michele

doi:10.1109/tia.2014.2369813

Cited by 31 publications

(19 citation statements)

References 18 publications

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“…The main objective is to minimize the magnetic flux density inside the room. Usually, the edge effects due to a local increase of the magnetic flux density close to the edges of the shield have to be taken into account in the design [30]. For this reason, it is a good approach to discretize the region of interest and minimize the average magnetic flux density rather than minimize the value at a single point or the maximum value [31].…”

Section: Optimization Methodsmentioning

confidence: 99%

Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms

et al. 2021

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In this paper, we propose an optimal design procedure for magnetically shielded rooms. Focusing on multi-layer ferromagnetic structures, where inner layers operate at very low magnetic field, we propose an identification method of the magnetic material characteristic in the Rayleigh region. A numerical model to simulate the shielding efficiency of a multi-layer ferromagnetic structure is presented and experimentally tested on different geometries and layer configurations. The fixed point iterative method is adopted to handle the nonlinearity of the magnetic material. In conclusion, the optimization of the design parameters of a MSR is discussed, using the Vector Immune System algorithm to minimize the magnetic field inside the room and the cost of the structure. The results highlight that a linear magnetic characteristic for the material is sufficient to identify the suitable geometry of the shield, but the nonlinear model in the Rayleigh region is of fundamental importance to determine a realistic shielding factor.

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Section: Optimization Methodsmentioning

confidence: 99%

Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms

et al. 2021

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“…Experts of the World Health Organization in the late 20th century discovered the carcinogenic properties of the magnetic field of overhead power lines with its weak but long-lasting effects on humans. Therefore, in the last 20 years the world has been actively implementing and constantly strengthening sanitary norms from the maximum allowable level of induction of magnetic field 50-60 Hz for the population, intensive development of methods for normalization of magnetic field [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The technology of active shielding of magnetic field of operating substations has been used by the majority for more than 10 years developed countries, such as the United States, Italy, Spain and Israel [5][6][7][8][9][10][11]. In works [12][13][14][15][16][17][18], methods for designing of such systems of active screening based on genetic optimization algorithms were developed.…”

Section: Introductionmentioning

confidence: 99%

Reduction of magnetic field level in residential old buildings from overhead power lines by means of active screening

Kuznetsov

Nikitina

Bovdui

et al. 2021

Electrical Engineering & Electromechanics

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Aim. Reduction of the magnetic field induction to the level of modern sanitary standards by means of active screening in residential old buildings which are located near existing typical overhead power lines are considered. Active shielding of the magnetic field inside a single-storey and multi-storey building is considered. During the design the number, configurations, spatial arrangement of the shielding windings, as well as the currents in the shielding windings were determined. Methodology. The design problem for the system of active shielding reduced to solving the minimax vector optimization problem. The vector of objective function in this minimax problem is calculated based on Biot-Savart's law. The solution of this problem is based on multi-agent optimization algorithms. Results. The results of theoretical and experimental studies of the systems of active shielding of the magnetic field generated by various overhead power lines inside a single and multi-storey building are presented. Originality. The possibility of reducing the induction of the initial magnetic field inside the shielded space to the level of sanitary standards is shown. Practical value. From the point of view of the practical implementation for a reasonable choice of the number and spatial arrangement of shielding windings of systems for active shielding of the magnetic field generated by various overhead power lines inside residential buildings of different storey’s are given.

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“…To normalize the level of the magnetic field, it is most effective and economically feasible to use active screening methods [3,4]. In an active shielding system (SAS), a compensating magnetic field is generated using shielding coils [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

mentioning

confidence: 99%

“…Most of the research focuses on reducing the magnetic field in one-story houses or even in a separate room at home [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Therefore, an urgent task is to reduce the magnetic field in the entire multi-storey building.…”

mentioning

confidence: 99%

Overhead power lines magnetic field reducing in multi-story building by active shielding means

Kuznetsov

Nikitina

Bovdui

et al. 2021

Electrical Engineering & Electromechanics

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Aim. Reducing of magnetic flux density of magnetic field in multi-storey building, generated by overhead power lines to the sanitary standards level by active shielding means. The tasks of the work are the synthesis, computer simulation and experimental research of three-circuits system of active shielding, which includes three shielding coils. Methodology. When synthesizing the system of active shielding of magnetic field, are determined their number, configuration, spatial arrangement and of shielding coils as well as the shielding coils currents and resulting magnetic flux density value in the shielding space. The synthesis is based on the multi-criteria game decision, in which the payoff vector is calculated on the basis on quasi-stationary approximation solutions of the Maxwell equations. The game decision is based on the stochastic particles multiswarm optimization algorithms. Results. Computer simulation and experimental research of three-circuit system of active shielding of magnetic field, generated by overhead power lines with phase conductors triangle arrangements in multi-storey building are given. The possibility of initial magnetic flux density level reducing in multi-storey building to the sanitary standards level is shown. Originality. For the first time to reducing of magnetic flux density of magnetic field in multi-storey building the synthesis, computer simulation and experimental research of three-circuit system of active shielding of magnetic field generated by single-circuit overhead power line with phase conductors triangular arrangements carried out. Practical value. Practical recommendations from the point of view of the practical implementation on reasonable choice of the spatial arrangement of three shielding coils of three-circuit system of active shielding of the magnetic field generated by single-circuit overhead power line with phase conductors triangular arrangements in multi-storey building are given.

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Magnetic Field Mitigation at Power Frequency: Design Principles and Case Studies

Cited by 31 publications

References 18 publications

Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms

Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms

Reduction of magnetic field level in residential old buildings from overhead power lines by means of active screening

Overhead power lines magnetic field reducing in multi-story building by active shielding means

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