Factors that influence transformer no-load current harmonics

Author

Al-Haj, Aiman Hassan ; El-Amin, Ibrahim

Author_Institution

Saudi Transformers Co., Dammam, United Arab Emirates

Volume

15

Issue

1

fYear

2000

fDate

1/1/2000 12:00:00 AM

Firstpage

163

Lastpage

166

Abstract

The harmonic components of the no-load current are influenced by many factors. These factors are the flux density, the degree of saturation and the core stacking technique. This paper tested many transformers for the no-load current and its harmonic components. A slight over-excitation results in a substantial increase of the THD level. The increase in the THD is not linear with the flux density. Also this work has demonstrated that having a lower no-load current should not be an indication of lower harmonics. The simulation of the transformer through the use of nonlinear inductors and resistors provided reasonable accuracy

Keywords

harmonic distortion; harmonics; magnetic flux; power transformers; transformer cores; THD level increase; core stacking technique; flux density; harmonic components; lower harmonics; no-load current; nonlinear inductors; over-excitation; resistors; transformer no-load current harmonics; Circuit faults; Current measurement; Current transformers; IEC standards; Magnetic cores; Magnetic materials; Petroleum; Stacking; Testing; Transformer cores;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.847245

Filename

847245