NDLI: Packet-to-Packet Variation of Flux Density in a Three-Phase, Three-Limb Power Transformer Core

Content Provider	IEEE Xplore Digital Library
Author	Balehosur, M.B. Marketos, P. Moses, A.J. Vincent, J.N.
Copyright Year	1965
Abstract	The results of an experimental investigation and calculations of the influence of bolt holes and slit edges on the packet to packet variation of flux density in a three-phase, three-limb power transformer core, tested under no load are presented. The overall peak flux density was calculated from the induced voltage in the secondary winding of the core whereas the flux densities in individual packets were calculated from the measured voltage induced across the top and bottom laminations of each packet using a flexible needle probe technique. Three single-phase cores were assembled from the individual packets of the three-phase core. Their effective permeabilities were measured and also calculated from the lamination dimensions and the B-H characteristics of the core material. The experiments and the calculations indicate that the variation in flux density in the three-phase, three-limb core can be attributed to the presence of bolt holes and stress near slit edges of laminations which reduce the effective permeability of the narrow packet considerably.
Sponsorship	IEEE Magnetics Society
Starting Page	642
Ending Page	645
Page Count	4
File Size	279241
File Format	PDF
ISSN	00189464
Volume Number	46
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Transformer cores Lamination Fasteners Permeability Testing Density measurement Voltage measurement Needles Probes transformer core Bolt holes building factor effective permeability
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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