Current Transformer Model

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 anomalou...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2007-01, Vol.22 (1), p.187-194
Main Authors: Guerra, Fd.C.F., Mota, W.S.
Format: Article
Language:English
Subjects:
Applied sciences
Asymmetry
Capacitors. Resistors. Filters
Current transformers
Current transformers (CTs)
Distortion
Distortion measurement
Disturbances. Regulation. Protection
Eddy current testing
Eddy currents
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Flux
Hysteresis
Laboratories
Magnetic flux
Magnetic hysteresis
magnetic losses
Mathematical models
Nonlinear distortion
Power networks and lines
Power system modeling
Power system protection
Resistors
Transformers
Transformers and inductors
Various equipment and components
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Description
Summary: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)
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2006.887092