NDLI: Experimental and Numerical Investigation of Flux Density Distribution in the Individual Packets of a 100 kVA Transformer Core

Content Provider	IEEE Xplore Digital Library
Author	Marketos, F. Marnay, D. Ngnegueu, T.
Copyright Year	1965
Abstract	The accurate measurement and calculation of transformer no-load losses is of high importance to transformer users and manufacturers alike. There are various ways of calculating no-load losses of transformers based on empirical formulas and experimentally obtained coefficients but these tend to mostly apply to known and tested core designs. The most important factors that contribute to the no-load loss of transformer cores are the grade of steel used, the core and corner geometry and stacking configuration. This paper presents re- sults and analysis for a 100 kVA, 3-phase model transformer core, consisting of 11 packets of different width laminations, over a range of flux densities up to 1.8 T. The results show the average magnetic flux desnity across the core cross section as well as the magnetic flux density of the individual packets. Using this information in combination with the magnetising current the no-load loss can be derived for the whole core as well as for the individual packets. The paper also shows numerical calculations of the excitation current required to magnetise the core. The FEA software used was developed in ALSTOM and allows the calculation of flux density distribution as well as the determination of the magnetising current necessary to magnetise the core at different flux density levels. It is believed that the combination of measurements and FE modelling will enable the calculation of local power loss thus allowing for optimisation of the various core parameters.
Sponsorship	IEEE Magnetics Society
Starting Page	1677
Ending Page	1680
Page Count	4
File Size	828417
File Format	PDF
ISSN	00189464
Volume Number	48
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transformer cores Loss measurement Magnetic flux Current measurement Magnetic domains Density measurement transformer cores Magnetic flux density magnetic losses magnetic cores
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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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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