Current Transformer Model

Author

Guerra, Francisco Das Chagas Fernandes ; Mota, Wellington Santos

Author_Institution

Univ. Fed. de Campina Grande

Volume

22

Issue

1

fYear

2007

Firstpage

187

Lastpage

194

Abstract

This paper presents a current-transformer (CT) model that is useful for low-frequency applications. To describe the iron-core magnetic behavior, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are represented by linear and nonlinear resistors, respectively. The obtained results are compared with those calculated by the Preisach´s model and measured in the laboratory. This model may be applied in power system protection studies, as it is the case of numeric correction of distorted secondary currents in current transformers (CTs)

Keywords

current transformers; eddy current losses; magnetic flux; power system protection; resistors; transformer cores; Preisach model; anomalous losses; current transformer; distorted secondary currents; eddy current losses; hysteresis model; iron-core magnetic behavior; linear resistors; nonlinear resistors; power system protection; remanent flux; Current transformers; Distortion measurement; Eddy currents; Laboratories; Magnetic flux; Magnetic hysteresis; Nonlinear distortion; Power system modeling; Power system protection; Resistors; Current transformers (CTs); hysteresis; magnetic losses; power system protection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2006.887092

Filename

4039431