Mechanical forces simulation of 25 kA current injection transformer with finite element method

The current value of secondary winding in this CIT is 25 kA and since the electromagnetic forces is proportional to square of current, the force calculation to design this CIT is necessary. The purpose of this paper is to present an investigation of forces that appears as a result of 25 kA current. In this paper mechanical force in two directions, inclusive axial and radial components, with finite element method is calculated. The simulation results show that the forces which apply to transformer windings are negligible. Also the stresses on conductor cross section area are negligible. The software that was used is the ANSYS 8.1

[1]  Tang Yun-Qiu,et al.  Numerical calculation of short circuit electromagnetic forces on the transformer winding , 1990 .

[2]  H. Heydari,et al.  Simulation and analysis of 25 kA current injection transformer (CIT) with finite element method , 2004, Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521).

[3]  László Kiss,et al.  Large Power Transformers , 1987 .

[4]  A. Takizawa,et al.  Axial vibration analysis of transformer windings with hysteresis of stress-and-strain characteristic of insulating materials , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).

[5]  K. Feser,et al.  Transfer Function Method to Diagnose Axial Displacement and Radial Deformation of Transformer Winding , 2002, IEEE Power Engineering Review.

[6]  S. J. Salon,et al.  Comparison of assumptions in computation of short circuit forces in transformers , 2000 .

[7]  Guo Zhenyan,et al.  Short circuit mechanical force withstand ability test , 2001, ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501).

[8]  A. Adly Computation of inrush current forces on transformer windings , 2001 .