Contribution to the Study of Losses Generated by Interlaminar Short-Circuits

Author

Bielawski, Jean-Patrick ; Duchesne, Stéphane ; Roger, Daniel ; Demian, Cristian ; Belgrand, Thierry

Author_Institution

Univ. Lille Nord de France, Lille, France

Volume

48

Issue

4

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

1397

Lastpage

1400

Abstract

The paper proposes an improved analytical model, valid for a wide frequency range, of interlaminar short-circuits on the edges of the sheets of high power transformers working at 50-60 Hz. This model is able to determine the current flowing in the microscopic interlaminar contacts formed by burrs, in order to estimate the maximum power dissipated in such hot spots. With this theoretical approach, it is also possible to get an interpretation of impedance measurements on a test coil wound around the core, in order to define a new index able to characterize the part of the shearing burrs in the manufacturing factor of large transformer cores. This new index will help the transformer manufacturers to improve their processes.

Keywords

coils; eddy current losses; electric current measurement; electric impedance measurement; electrical contacts; iron alloys; power transformers; shearing; short-circuit currents; transformer cores; transformer windings; current determination; frequency 50 Hz to 60 Hz; high power transformer sheet; impedance measurements; interlaminar short-circuits; maximum power dissipation; microscopic interlaminar contacts; shearing burrs; test coil; transformer core; transformer manufacturer; Coils; Impedance; Magnetic hysteresis; Mathematical model; Resistance; Transformer cores; Analytical model; interlaminar short-circuits characterization; manufacturing factor; transformer core;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2173472

Filename

6172378