Determination of a New Model for Investigating Ultra-Saturation Phenomenon during the Enegization of the Loaded Three-Phase Power Transformer and Its Effect on Differential Protection
Subject Areas : electrical and computer engineeringB. Noshad 1 , M. Razaz 2 , S. Gh. Seifossadat 3
1 -
2 -
3 -
Abstract :
One of the mal-operation of the power transformer differential protection that may occur during the energization of a loaded power transformer is the ultra-saturation phenomenon. In this paper, a new model to study the ultra-saturation phenomenon during the energizaton of a loaded three-phase power transformer is presented and its effect on the differential protection of the power transformer is considered. For modeling of the ultra-saturation phenomenon, the nonlinear characteristic of the transformer core and the saturation effect of current transformers are considered. It is assumed that the load of the power transformer is a resistive and an inductive load. The mal-operation of the differential protection depends on a variety of factors the most important parameters of which are inception angle and residual flux. In this paper the parameters mentioned will study in different cases. In this paper, simulation is done by MATLAB program.
[1] C. A. Mathews, "An improved transformer differential relay," AIEE Trans., vol. 73, no. 7, pp. 645-650, Jun. 1954.
[2] T. R. Specht, "Transformer magnetizing inrush current," AIEE Trans., vol. 70, no. 3, pp. 323-328, 1951.
[3] X. Lin and P. Liu, "The ultra-saturation phenomenon of loaded transformer energization and its impacts on differential protection," IEEE Trans. on Power Delivery, vol. 20, no. 2, pp. 1265-1272, Apr. 2005.
[4] H. Weng, X. Lin, and P. Liu, "Studies on the operation behavior of differential protection during a loaded transformer energization," IEEE Trans. on Power Delivery, vol. 22, no. 3, pp. 1386-1391, Jul. 2007.
[5] A. Wiszniewski, W. Rebizant, D. Bejmert, and L. Schiel, "Ultra saturation phenomenon in power transformers-myths and reality," IEEE Trans. on Power Delivery, vol. 23, no. 3, pp. 1327-1334, Jul. 2008.
[6] A. Wiszniewski, H. Ungrad, and W. Winkler, Protection Techniques in Electrical Energy Systems, New York: Marcel Dekker, 1995.
[7] Numerical Differential Protection Relay for Transformers, Generators, Motors and Mini Bus Bars, SIEMENS AG, 2006, 7UT613/63x V.4.06 Instruction Manual, Order. C53000-G1176-C160-2.
[8] J. Pedra, L. Saniz, F. Corcoles, R. Lopez, and M. Salichs, "PSPICE computer model of a nonlinear three-phase three-legged transformer," IEEE Trans. on Power Delivery, vol. 19, no. 1, pp. 200-207, Jan. 2004.
[9] M. Naidu and G. W. Swift, "Dynamic analysis of a current transformer during faults," Electric Power System Research, vol. 11, no. 3, pp. 225-231, Dec. 1986.
