Compensation of nonlinearities in a current transformer for the reconstruction of the primary current

Author

Bittanti, Sergio ; Cuzzola, Francesco Alessandro ; Lorito, Fabrizio ; Poncia, Guido

Author_Institution

Dipartimento di Elettronica, Politecnico di Milano, Italy

Volume

9

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

565

Lastpage

573

Abstract

The measurement of the current in industrial electrical devices is often carried out by current transformers. The reliability of these devices is compromised when the measured current is higher than the nominal value, due to the saturation and hysteresis effects of the magnetic core. In this paper, a nonlinear model of the current transformer is identified by means of a separable least squares technique. This model is successfully employed for the estimation of the primary current starting from experimental measurements of the distorted secondary current. In this way, a fair estimate of the primary current is obtained even when its maximum intensity reaches up to 60 times (or more) its nominal value. Some sensible experimental trials are reported in order to demonstrate the effectiveness of the technique developed

Keywords

compensation; current transformers; electric current measurement; least squares approximations; nonlinear systems; reliability; signal reconstruction; current measurement; current transformer; distorted secondary current; hysteresis; industrial electrical devices; magnetic core; nonlinearity compensation; primary current estimation; primary current reconstruction; saturation; separable least squares technique; Circuit faults; Conducting materials; Current measurement; Current transformers; Electrical equipment industry; Least squares methods; Magnetic cores; Magnetic hysteresis; Magnetic materials; Nonlinear distortion;

fLanguage

English

Journal_Title

Control Systems Technology, IEEE Transactions on

Publisher

ieee

ISSN

1063-6536

Type

jour

DOI

10.1109/87.930967

Filename

930967