Electrical modeling of transformer connecting bars

Author

Clavel, Edith ; Roudet, J. ; Foggia, A.

Author_Institution

Laboratoire d´´Electrotechnique de Grenoble, Saint Martin D´´Heres, France

Volume

38

Issue

2

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1378

Lastpage

1382

Abstract

Traditionally, connections in high-voltage, high-current, and low-frequency circuits are always considered as perfect short circuits, so to analyze their contribution to electrical performance of a structure is not considered necessary. We show here that, even for low-frequency structures, the electrical parasitic characteristics of cabling can lead to some unexpected performances. In particular, our study of outside connections of a 400 MVA transformer has shown current imbalances between the three phases and inside the phases. We achieved this by using a semianalytical method that is presented in this paper. Results show the need to model this part of the structure. This method has advantages over numerical techniques of calculation

Keywords

busbars; equivalent circuits; inductance; power cables; power system analysis computing; power transformers; PEEC method; cabling electrical parasitic characteristics; current imbalances; electrical modeling; electrical performance; high-current circuits; high-voltage circuits; low-frequency circuits; low-frequency structures; parasitic inductance; partial element equivalent circuit method; perfect short circuits; semianalytical method; three phase currents; transformer connecting bars; transformer outside connections; Bars; Circuit analysis; Conductors; Current distribution; Impedance; Inductance; Joining processes; Performance analysis; Phase transformers; Power cables;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.996028

Filename

996028