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

Author

Guasch, L. ; Córcoles, F. ; Pedra, J.

Author_Institution

Dept. of Electron., Electr. & Autom. Eng., Univ. Rovira i Virgili, Tarragona, Spain

Volume

2

fYear

2002

fDate

6-9 Oct. 2002

Firstpage

571

Abstract

This paper describes the influence of voltage sags on three-phase three-legged transformers. The model includes saturation, and it is based on experimental parameters. It has been implemented in PSpice. Voltage recovery after the voltage sag causes 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 are studied: depth, duration and initial point-on-wave. The most important variable is sag duration, which has a periodical influence.

Keywords

SPICE; equivalent circuits; parameter estimation; power engineering computing; power supply quality; power transformers; saturable core reactors; transformer magnetic circuits; 220 V; 380 V; 60 kVA; PSpice; inrush current; point-on-wave; sag duration; three-phase three-legged transformer; transformer energizing; transformer saturation; voltage recovery; voltage sag effect; Equivalent circuits; Leg; Magnetic circuits; Magnetic cores; Magnetic flux; Power quality; Saturation magnetization; Surges; Transformer cores; Voltage fluctuations;

fLanguage

English

Publisher

ieee

Conference_Titel

Harmonics and Quality of Power, 2002. 10th International Conference on

Print_ISBN

0-7803-7671-4

Type

conf

DOI

10.1109/ICHQP.2002.1221498

Filename

1221498