Dynamic Deformation Analysis of Power Transformer Windings in Short-Circuit Fault by FEM

• Published in: IEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 4
• Main Authors: Zhang, Haijun, Yang, Bin, Xu, Weijie, Wang, Shuhong, Wang, Guolin, Huangfu, Youpeng, Zhang, Jingyin
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Dynamic deformation; Dynamics; Electrical engineering. Electrical power engineering; electromagnetic force; Electromagnetic forces; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; finite element analysis; Force; power transformer; Power transformers; short-circuit current; Strain; Stress; Testing, measurement, noise and reliability; Testing. Reliability. Quality control; Transformers and inductors; Windings; EMTP; Worst case method; Elasticity; Dynamic deformation; Stress strain; short-circuit current; Finite element method; Magnetic field; Disk winding; Mechanical deformation; Machine windings; Dynamic response; Transient response; Dynamic characteristic; Short circuit currents; Electromagnetic force; Power electronics; Two dimensional model; Power transformer; finite element analysis; Short circuit; Mechanical stress; Spacer; Transformer windings; Three phase circuit
• DOI: 10.1109/TASC.2013.2285335
• ISSN: 1051-8223

This paper presents the investigations of short-circuit current, electromagnetic force, and transient dynamic response of windings deformation including mechanical stress, strain, and displacements for an oil-immersed-type 220-kV power transformer. The worst-case fault with three-phase short-circuit happening simultaneously is assumed. A considerable leakage magnetic field excited by short-circuit current can produce the dynamical electromagnetic force to act on copper disks in each winding. The two-dimensional finite element method (FEM) is employed to obtain the electromagnetic force and its dynamical characteristics in axial and radial directions. In addition, to calculate the windings deformation accurately, we measured the nonlinear elasticity characteristic of spacer and built three-dimensional FE kinetic model to analyze the axial dynamic deformation. The results of dynamic mechanical stress and strain induced by combining of short-circuit force and prestress are useful for transformer design and fault diagnosis.