Hydropower Development in Southern and Southeastern Asia

Author

Sadden, Brian

Volume

22

Issue

3

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

5

Lastpage

9

Abstract

Recently, no-load losses P and noise n of transformer cores have been reduced by replacing the former single-step-lap (SSL) joints by multistep-lap (MSL) joints. On the other hand, the application of MSL in model cores was found not only to decrease P and n, but in some cases they increase. The aim of this paper is the investigation of the difference between SSL and MSL with respect to local magnetic conditions at joint regions and their relevance for global conditions in the core. The results show that the joint is the key region of the transformer core, affecting its dynamical behavior in a distinct way. To minimize the iron losses and the noise of the core, the step lap number N should be chosen carefully to avoid the appearance of "virtual temporary air gaps".

Keywords

acoustic noise; joining processes; losses; noise abatement; power transformers; transformer cores; transformer windings; dynamical behavior; global conditions; joint regions; local magnetic conditions; multistep-lap joint power transformer cores behaviour; no-load losses reduction; noise reduction; single-step-lap joints; step lap number; virtual temporary air gaps; Acoustic noise; Core loss; Lamination; Magnetic cores; Magnetic flux; Magnetostriction; Power system reliability; Power transformers; Steel; Transformer cores;

fLanguage

English

Journal_Title

Power Engineering Review, IEEE

Publisher

ieee

ISSN

0272-1724

Type

jour

DOI

10.1109/MPER.2002.989193

Filename

989193