Electromagnetic force calculations on a 3-phase autotransformer under time-varying fault by a 3D nonlinear finite element code

Journal Article · Mon Mar 01 00:00:00 EST 1993 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/20.250804· OSTI ID:6411624

Arturi, C M ^[1]

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1. Politecnico di Milano (Italy)

This paper presents an application of a magnetostatic 3D non-linear FE code to the computation of the axial forces on the windings of a large-power autotransformer due to short circuit currents. The analyzed five-limb core autotransformer has an internal tertiary delta-connected winding. A comparison between the axial forces due to the peak currents of both a time-varying configuration fault and two conventional faults - two-phase earth fault and three-phase earth faults - has been made. First, the authors compute the transient fault currents and the corresponding MMFs of each winding, by simulation with ATP (Alternative Transients Program) of a specific circuital non-linear model of the autotransformer. Then, by imposing the peak current density J to each winding, they compute the magnetic field H with the code Maxwell 3DFS. Finally, they evaluate the axial force on the autotransformer windings. The FE model takes only 1/4 of the actual geometry of the autotransformer, due to the symmetry. The obtained results show that the time-varying fault yields greater axial forces than the conventional faults, particularly on the internal tertiary delta-connected winding.

• OSTI ID: 6411624
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 29:2; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
TRANSFORMERS
DESIGN
ELECTRICAL FAULTS
A CODES
CURRENT DENSITY
ELECTROMAGNETIC FIELDS
FINITE ELEMENT METHOD
M CODES
MAGNETIC FIELDS
THREE-DIMENSIONAL CALCULATIONS
TRANSIENTS
CALCULATION METHODS
COMPUTER CODES
ELECTRICAL EQUIPMENT
EQUIPMENT
NUMERICAL SOLUTION
240100* - Power Systems- (1990-)