Effects of symmetrical voltage sags on three-phase three-legged transformers

Author

Guasch, Luis ; Córcoles, Felipe ; Pedra, Joaquín ; Sáinz, Luis

Author_Institution

Dept. of Electron., Univ. Rovira i Virgili, Tarragona, Spain

Volume

19

Issue

2

fYear

2004

fDate

4/1/2004 12:00:00 AM

Firstpage

875

Lastpage

883

Abstract

This paper describes the effects of symmetrical voltage sags on three-phase three-legged transformers. The transformer model includes saturation and is based on experimental parameters. It has been implemented in PSpice. Voltage recovery after a voltage sag can produce transformer saturation. This saturation produces an inrush current similar to that of the transformer energizing. The variables that influence the peak value of the inrush current, namely depth, duration, and initial point-on-wave are studied. A result that must be emphasized is the periodical influence of the sag duration.

Keywords

SPICE; power supply quality; power transformers; PSpice; initial point-on-wave; inrush current; symmetrical voltage sags effect; three-phase legged transformers; transformer energizing; transformer saturation; voltage recovery; Equivalent circuits; Leg; Magnetic circuits; Magnetic cores; Magnetic flux; Power quality; Saturation magnetization; Surges; Transformer cores; Voltage fluctuations;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2004.825306

Filename

1278453