NDLI: Characteristics of Inrush Current of Present Designs of Power Transformers

Content Provider	IEEE Xplore Digital Library
Author	Girgis, Ramsis S. teNyenhuis, Ed G.
Copyright Year	2007
Description	Author affiliation: Fellow, IEEE, Chairman, IEEE Transformers Subcommittee, Technical manager, ABB Inc., ABB Power Transformer plant, Saint Louis, MO; Member, several working groups and subcommittees, IEEE Transformers Standards Committee. (Girgis, Ramsis S.) \|\| Member, IEEE, Technical manager, ABB Inc., ABB TRES (Transformer Remanufacturing and Engineering Solutions) Brampton, ON, Canada; Chairman, IEEE Working Group, Loss Measurement and Tolerances of power and distribution transformers. (teNyenhuis, Ed G.)
Abstract	Accurate calculation of peak and % 2nd harmonic of inrush current is critical to appropriate selection of relay protection of a power transformer. In this paper, a description is given of a rigorous calculation of magnitude and wave-shape of inrush current as a function of the transformer design parameters as well as parameters of the system to which the transformer is connected. A comparison is given between magnitudes of peak inrush currents calculated using the presented calculation method and the old formula commonly used in the industry. Also, advancements made to transformer technology in the past three decades have changed the characteristics of the transformer inrush current. The second part of this paper presents the impact of these design, material, and system parameters on the peak value and minimum % ratio of 2nd harmonic content of inrush current of transformers of small, medium, and large power transformers. Parameters studied are core design induction, core material, core joint geometry, power rating, winding connections, and number of phases. These studies have been performed using the newly developed calculation.
Starting Page	1
Ending Page	6
File Size	395641
Page Count	6
File Format	PDF
ISBN	142441296X
ISSN	19325517
DOI	10.1109/PES.2007.386291
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Surge protection Circuit faults Transformer cores Magnetic cores Electrical equipment industry Equations Power system harmonics Energy management Engineering management Magnetics Transformers Inrush Current Remnant Flux
Content Type	Text
Resource Type	Article

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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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