Attenuation of low frequency magnetic fields using active shielding

Reta-Hernández, Manuel; Karady, G.G.

doi:10.1016/s0378-7796(97)01232-7

Cited by 29 publications

(15 citation statements)

References 17 publications

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“…There are an infinite number of image coils. The image coils can be divided into two groups to calculate according to their x coordinates, such as Equations (5) and (6). The flux density of the combined effect of the original coil and the boundary conditions on all the six planes can be expressed as Equation (7).…”

Section: Image Coils Created For Boundary Conditions In Xy Xz and Yzmentioning

confidence: 99%

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Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

Cao

Pan

et al. 2018

Energies

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Ultra-low magnetic fields have drawn lots of attention due to their important role in scientific and technological research. The combination of a magnetic shield and an active compensation coil is adopted in most high performance magnetically shielded rooms. Special consideration needs to be taken in the coil design since the magnetic shield significantly affects the uniformity of the magnetic field that is generated by the coil. An analytical model for the magnetic field calculation of the coil inside a cubic magnetic shield is proposed based on the generalized image method, which is validated by finite element analysis. A novel design method of the coil used in a cubic magnetic shield with a large homogeneous volume is proposed. The coil parameters are optimized to obtain a large cubic uniform volume with desired total deviation rate by discretizing the central volume in the coil. In the desired total deviation rate, the normalized usable volume of the new coil increases by 70% when compared with the Merritt coil. A coil system is developed according to the parameters obtained based on this method. The magnetic flux density and practical deviation rate of the coil are measured to validate the accuracy of this model and the feasibility of the design method. The experimental magnetic flux density agrees well with the analytical value. The maximum practical deviation rate of uniform volume of 0.8 × 0.8 × 0.8 m is in good agreement with the theoretical design value, taking into account the experiment errors.

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Section: Image Coils Created For Boundary Conditions In Xy Xz and Yzmentioning

confidence: 99%

“…The passive magnetic shield has been extensively used for high frequency ranges. To shield static and very low frequency magnetic fields, active compensation coils are widely used because of low costs when compared with the passive magnetic shield [5,6]. There are two main objectives for this combination in MSRs.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

Cao

Pan

et al. 2018

Energies

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“…This technique has been shown to be attractive for the reduction of the MF in wide areas close to overhead lines [6,[8][9][10], where the currents to be injected into the loops can be analytically derived from the MF distribution generated by the source and its geometry, since the system can be rendered in 2D. Furthermore, there are studies in which a particular 3D region is shielded by using a certain number of active coils surrounding the region [11,12], for which analytical expressions can be derived when sources are simple (e.g. a coil or a three-phase line).…”

Section: Introductionmentioning

confidence: 99%

Design of active loops for magnetic field mitigation in MV/LV substation surroundings

Del-Pino-López

Giaccone

Canova

et al. 2015

Electric Power Systems Research

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“…On the contrary the magnetic field is more likely to violate the limitations and some measures must be taken to comply the regulations. Fortunately, the current literature explored quite well the possible mitigation solutions for power lines identifying several options suitable for overhead lines [5], underground lines [6], [7], [8], and substations [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field mitigation at power frequency: Design principles and case studies

Bavastro

Canova

Freschi

et al. 2014

2014 IEEE Industry Application Society Annual Meeting

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The purpose of this article is to analyze the main techniques for magnetic field mitigation at power frequency and assess their effectiveness presenting two real application used as case studies. Some mitigation techniques presented in the literature are reviewed and discussed. The result of the preliminary numerical design is compared with results of measurements on real installations, showing that the available methods are mature instruments for the design of mitigation measures.

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Attenuation of low frequency magnetic fields using active shielding

Cited by 29 publications

References 17 publications

Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

Design of active loops for magnetic field mitigation in MV/LV substation surroundings

Magnetic field mitigation at power frequency: Design principles and case studies

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