Electromagnetic Modeling of a High Voltage Current Transformer

Author

Collett, Walter ; Mahajan, Satish

Author_Institution

Western Kentucky Univ., Bowling Green

fYear

2007

fDate

Sept. 30 2007-Oct. 2 2007

Firstpage

80

Lastpage

84

Abstract

An electromagnetic modeling procedure for a high voltage current transformer is presented. The procedure can be used to estimate all major components of power loss, including loss in the core, windings, and steel tank enclosure. Provision is also made for incorporating the effects of electrical contact resistance. Finite element analysis is used to estimate core and enclosure losses, while winding losses are obtained through simple closed form calculations. Under certain circumstances, the model shows that loss in the enclosure can be greater than that of the transformer core or windings. Discussion of how the model might be used in a thermal analysis to help predict the capability of the current transformer to sustain operation greater than rated capacity will be presented.

Keywords

contact resistance; current transformers; finite element analysis; instrument transformers; losses; transformer cores; transformer windings; electrical contact resistance effects; electromagnetic modeling; finite element analysis; high-voltage current transformer; power loss; steel tank enclosure losses; thermal analysis; transformer core losses; transformer winding losses; Contact resistance; Current transformers; Electric resistance; Electromagnetic modeling; Finite element methods; Machinery; Mathematical model; Predictive models; Steel; Transformer cores; electrical equipment enclosures; finite element methods; magnetic cores; transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Symposium, 2007. NAPS '07. 39th North American

Conference_Location

Las Cruces, NM

Print_ISBN

978-1-4244-1725-4

Electronic_ISBN

978-1-4244-1726-1

Type

conf

DOI

10.1109/NAPS.2007.4402290

Filename

4402290