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ESTIMATION OF STRAY LOSSES IN POWER TRANSFORMERS USING 3D FEM AND STATISTICS

Franjo Kelemen orcid.org/0000-0002-5766-978X ; Končar Power Transformers Ltd.
Goran Pliškić ; Končar Power Transformers Ltd.
Sead Berberović ; Faculty of Electrical Engineering and Computing

Sažetak

Total losses of a power transformer are subdivided in several distinctive parts. The I2R losses are
easy to calculate and can be precise to a level of measurement repeatability and tolerances of the
guaranteed material properties. The additional losses inside the windings can be calculated almost with
the same precision using analytic methods. The third part of the load losses that consists of stray losses
is the smallest and the most difficult to estimate. However, stray losses estimation is very important in the
design phase of a power transformer. Not only because the guaranteed design parameters have to be
satisfied, but also the utmost care has to be taken that local losses density across the power transformer
does not exceed levels that are permissible in the long term loading conditions of a transformer. The
additional losses estimation process presented in this paper models the additional losses level in a
transformer as a unit.

Ključne riječi

eddy losses; finite element method; power transformer; stray field; stray losses

Hrčak ID:

199029

URI

https://hrcak.srce.hr/199029

Datum izdavanja:

15.7.2017.

Posjeta: 493 *