Title :
Theoretical Calculation of Inrush Currents in Three- and Five-Legged Core Transformers
Author :
Sáinz, Luis ; Córcoles, Felipe ; Pedra, Joaquín ; Guasch, Luis
Author_Institution :
Dept. of Electr. Eng, Univ. Politecnica de Catalunya, Barcelona
fDate :
4/1/2007 12:00:00 AM
Abstract :
In this paper, a theoretical study of the three-phase transformer behavior in the presence of a sag is presented by considering that the fault clearing is produced simultaneously in all phases. Analytical expressions of the magnetic flux and the inrush current after voltage recovery are obtained, and the results presented in the literature are analytically justified. The influence of depth, duration, and the initial point-on-wave on the peak value of the inrush current are studied for all sag types. Simple expressions to obtain the value of the current peaks are presented
Keywords :
magnetic flux; power supply quality; power transformers; five-legged core transformer; inrush currents; magnetic flux; three-legged core transformer; voltage recovery; voltage sag; Magnetic analysis; Magnetic cores; Magnetic flux; Magnetic separation; Phase transformers; Power system modeling; Saturation magnetization; Surges; Transformer cores; Voltage fluctuations; Inrush current; transformer model; voltage sag;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2006.881428
