A new current transformer model

AUTOR(ES)

Guerra, Francisco das Chagas Fernandes, Mota, Wellington Santos

FONTE

Sba: Controle & Automação Sociedade Brasileira de Automatica

DATA DE PUBLICAÇÃO

2005-09

RESUMO

This paper presents a current transformer model that is useful on low frequency applications. To describe the iron core magnetic behaviour of the iron core, 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 Preisach's model and measured in 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 (CT's).

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