Calculation of magnetic shielding of a substation at power frequency using FEM

Author

Hasselgren, L. ; Möller, E. ; Hamnerius, Y.

Author_Institution

Dept. of Microwave Technol., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

9

Issue

3

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1398

Lastpage

1405

Abstract

The finite element method (FEM) is used for analyzing the shielding effectiveness of an eddy current shield applied to a 10/0.4 kV substation. The influence of the shield extension is studied, and a calculated magnetic field attenuation of 30 dB is obtained for a 5 mm aluminum shield applied on the ceiling and the walls. With a 3D model, the eddy current distribution in the shield is studied, giving guidance for door positioning. Here, the insertion of a door in the shielded wall off the paths of the main eddy currents is found to create only a locally elevated magnetic field. With a simplified 2D model, the influence of shield conductivity is also analyzed. An increase of the conductivity over that of aluminum here gives a limited shielding improvement

Keywords

aluminium; eddy currents; finite element analysis; magnetic shielding; substations; 0.4 kV; 10 kV; 3D model; 5 mm; FEM; aluminum shield; door positioning; eddy current distribution; eddy current shield; finite element method; locally elevated magnetic field; magnetic field attenuation; magnetic shielding calculation; power frequency; shield conductivity; shield extension; simplified 2D model; substation; Bars; Eddy currents; Frequency; Magnetic analysis; Magnetic field measurement; Magnetic shielding; Microwave technology; Substations; Switchgear; Transformers;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.311168

Filename

311168