Title :
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
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;
Conference_Titel :
Harmonics and Quality of Power, 2002. 10th International Conference on
Print_ISBN :
0-7803-7671-4
DOI :
10.1109/ICHQP.2002.1221498
