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ANALYSIS AND EXPERIMENTAL VERIFICATION OF STATIC TILTING BEHAVIOUR OF CTC IN TRANSFORMER WINDINGS

Bruno Bošnjak orcid.org/0000-0001-9432-8223 ; Siemens AG Power Transformers Nürnberg
Mario Stuhne ; Končar - Power Transformers Ltd.

Sažetak

This paper presents a numerical model and experimental verification of the critical tilting force
calculation for transformer winding conductors under static axial pressure. For the purposes of this
investigation a structural finite element method model of a non-epoxy bonded continuously transposed
conductor used for the construction of transformer windings was developed. The mechanical behaviour of
two different transformer winding conductors under static axial pressure was simulated. The radial
position of CTCs was varied according to manufacturer tolerances in order to closer correspond to the
actual physical models. The displacements, stresses and strains obtained from the simulation are
presented and analysed. This calculation is compared to existing analytical and empirical calculations in
the IEC 60076-5:2006 and available literature. The results of these calculations were experimentally
checked by pressing three physical winding models in a hydraulic press with the force corresponding to
calculated critical tilting force and above. The resulting deformations of the winding conductors were
photographed and compared to the results of the simulations.

Ključne riječi

Transformer; Windings; Short Circuit; Tilting; FEM; Structural Simulation

Hrčak ID:

199209

URI

https://hrcak.srce.hr/199209

Datum izdavanja:

15.8.2017.

Posjeta: 802 *