NDLI: Comparing the T and <formula formulatype=inline> <tex Notation=TeX>$pi$</tex></formula> Equivalent Circuits for the Calculation of Transformer Inrush Currents

Content Provider	IEEE Xplore Digital Library
Author	de Leon, F. Farazmand, A. Joseph, P.
Copyright Year	1986
Abstract	The most commonly used equivalent circuit for transformers is the traditional (Steinmetz) T-equivalent proposed toward the end of the 19th century. This model has two leakage impedance branches and one magnetizing branch. The T model properly represents the terminal behavior of the transformer for most low-frequency operating conditions. Another model derived from the principle of duality between magnetic and electric circuits exists, the π equivalent circuit, which has two magnetizing branches and one leakage branch. This paper shows that while the two equivalent circuits provide the same accuracy in steady state, better accuracy for the calculation of inrush currents is obtained with the π -equivalent circuit. Laboratory tests performed on three transformers with different characteristics demonstrate that inrush current simulations with the T equivalent circuit can have errors up to 73%, while the π equivalent estimates the measurements in every case within a few percent.
Sponsorship	IEEE Power Engineering Society
Starting Page	2390
Ending Page	2398
Page Count	9
File Size	1522089
File Format	PDF
ISSN	08858977
Volume Number	27
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Integrated circuit modeling Circuit faults Surges Inductance Equivalent circuits Current measurement Toroidal magnetic fields transformer modeling Duality inrush currents transformer equivalent circuits
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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