Numerical calculation of short circuit electromagnetic forces on the transformer winding

Based on expressions for transient three-phase short-circuit current, the formulas for radial and axial electromagnetic forces acting on transformer windings are derived. The short-circuit forces, include three components: DC component, fundamental-frequency component, and double-frequency component...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1990-03, Vol.26 (2), p.1039-1041
Main Authors: Tang, Y-Q, Qiao, J-Q, Xu, Z-H
Format: Article
Language:English
Subjects:
Circuit faults
Electromagnetic forces
Electromagnetic transients
Frequency
Iron
Magnetic circuits
Magnetic fields
Power transformers
Short circuit currents
Windings
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Summary:Based on expressions for transient three-phase short-circuit current, the formulas for radial and axial electromagnetic forces acting on transformer windings are derived. The short-circuit forces, include three components: DC component, fundamental-frequency component, and double-frequency component. Using a 17000-kVA transformer as a model, the 2-D leakage magnetic fields and forces with various phase angles are calculated by the finite-element method. The results are compared with design formulas. Numerical calculations show that the conventional design formulas used to calculate radial force can meet engineering needs.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.106498