Measurement of λ-i characteristics of asymmetric three-phase transformers and their applications

Author

Fuchs, Ewald F. ; You, Yiming

Author_Institution

Colorado Univ., Boulder, CO, USA

Volume

17

Issue

4

fYear

2002

fDate

10/1/2002 12:00:00 AM

Firstpage

983

Lastpage

990

Abstract

Modeling of three-phase transformers with three-limb cores is important, such units are very ubiquitous and are asymmetric due to the different lengths of the three limbs of the core. It is, therefore, important to devise a measuring procedure, where the (λ-i) characteristics of the three limbs and the zero-sequence (λ₀-i₀) characteristic due to the tank can be determined. A simulation program is developed so that currents at no-load and symmetric or asymmetric loads can be computed. Measured currents are compared with computed results for 2.3-kVA and 45-kVA units.

Keywords

characteristics measurement; power transformers; transformer cores; λ-i characteristics measurement; 2.3 kVA; 45 kVA; asymmetric loads; asymmetric three-phase transformers; measuring procedure; no-load currents; simulation program; symmetric loads; three-limb cores; zero-sequence characteristic; Circuits; Iron; Magnetic flux; Magnetic hysteresis; Mutual coupling; Particle measurements; Phase measurement; Phase transformers; Transformer cores; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2002.803702

Filename

1046873