MTL-Based Analysis to Distinguish High-Frequency Behavior of Interleaved Windings in Power Transformers

• Published in: IEEE transactions on power delivery Vol. 28; no. 4; pp. 2291 - 2299
• Main Authors: Kane, Makarand M., Kulkarni, S. V.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Conductors; Convertors; Electrical engineering. Electrical power engineering; Electrical machines; Exact sciences and technology; Frequency-domain analysis; Integrated circuit modeling; Mathematical model; Multiconductor transmission lines; Power electronics, power supplies; Power transmission lines; resonances; Studies; transformer windings; Transformers and inductors; Transmission line matrix methods; Windings; Oscillation frequency; Power electronics; Multiconductor transmission lines; Multiconductor line; resonances; Experimental study; Power transformer; Low voltage; Transmission line; Frequency converter; Transformer windings; High frequency; TLM method; Comparative study; Machine windings
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2013.2268982

An elaborate method to analyze the high-frequency behavior of transformer windings by means of the multiconductor transmission line (MTL) method is presented. A procedure for the evaluation of per-unit length parameters for transformer windings (TWs) is enumerated, which is not available in existing literature on the subject. A full-length detailed solution of the MTL method for TW is also demonstrated. A comparison of this method with the conventional circuit approach is illustrated wherever necessary. The analysis of two types of commonly used interleaved windings is performed in this paper. It is also inferred from experimental results that a conventional low-voltage impulse test is insufficient to make a distinction between the two windings. As far as interwinding oscillations at high-frequency excitations are concerned, it also proved by the MTL analysis that one type is better than the other.