NDLI: Identification of Power Frequency Industrial Magnetic Field Sources for Shielding Purposes

Content Provider	IEEE Xplore Digital Library
Author	Canova, A. Freschi, F. Repetto, M. Tartaglia, M.
Copyright Year	1972
Abstract	In any industrial installation, power electric systems generate extremely low frequency magnetic fields. Field amplitude values must fulfill the limits related to health effects or to disturbances on electromagnetic devices, and a shielding system is sometimes necessary. The design of magnetic field shields requires the simulation of the sources and of the shields in order to evaluate the main parameters like geometry, material, and position with respect to sources. An alternative approach is proposed in this paper which requires one to measure a spatial distribution of the magnetic field amplitude. Actual field sources are simulated by means of suitable simplified sources handled by analytical relations. An identification process of measured magnetic fields is performed using a genetic algorithm applied to the simplified source system. The simplified system is a suitable combination of three-phase sources, and it seems able to create a realistic magnetic field distribution in both space and time. This paper presents the proposed method and its application to the design of a conductive shielding to reduce the leakage fluxes of a three-phase transformer without enclosure. The magnetic field to be shielded is evaluated with a simple 3-D model of a transformer constituted by three windings in air with current values deduced from the equivalent magnetomotive force which is considered the actual source. Unshielded fields on a plane region are used to identify the simplified source, and the effects of a conducting aluminum shielding are compared using actual and simplified sources. The influence of some parameters of the simplified sources on the results is discussed. Finally, the application for the design of a magnetic field shielding in real substation is presented.
Sponsorship	IEEE Industry Applications Society
Starting Page	1834
Ending Page	1840
Page Count	7
File Size	925221
File Format	PDF
ISSN	00939994
Volume Number	44
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Magnetic shielding Magnetic field measurement Magnetic materials Power generation Electromagnetic devices Solid modeling Geometry Analytical models Magnetic analysis shielding Identification of sources magnetic field
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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