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Zeitschriftenartikel:

E Mulasalihovic, H. Pfützner, P. Zanolin:
"3D Stray Field Analysis of Transformer Cores";
Przeglad Elektrotechniczny, vol 87 (2011), no 9b; S. 57 - 60.



Kurzfassung englisch:
The paper presents experimental analyses of stray field configurations of a 3-phase/3-limb model transformer core. Core-tank interactions are roughly simulated arraging a steel plate above the core. The paper considers also DC-bias, caused e.g. by geomagnetically induced currents (GICs). For the determination of stray field distributions B(x,y,z.t) an automatic scanning system was applied, based on the 3D hall sensor method. A sensor with four needle contacts was used for non-destructive 2D analyses of local distributions of eddy current fields E(x,y,t) as arising at the upper and lower surface of the simulated tank material. The results reveal strong increases of stray field through weak bias if arising in a non-balanced way. In the tank sumulation plate, mainly cross-sectional eddy currents are generated, flowing perpendicular to the limbs as a rough tendency. Bias yields very strong enhancements of eddy current losses. Above the tank siumulation, a considerably strong rest stray field arises. As a rough tendency, it is directed from one yoke to the other one, however, with complex reconstructions as a function of time. The novel methodology promises to complement traditionally performed numerical analyses in a effective way.

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.