engleski

Flux distribution inside the transformer core in short circuit

This paper shows results of experimental research on a scaled two winding single phase transformer model and FEM calculation of stray flux inside the core in short circuit test connection (load loss test). For the measurement purpose core was divided into 7 “packages” continuously along core’s cross section. Around each package 4 turns were wounded for flux distribution measurement. Stray flux distribution was observed in three positions along limb and yoke. Results have shown that an appreciable amount of stray flux appears inside the core even in the central packages. Flux distribution changes both in limb and yoke when power supply is changed from inner to outer winding. Comparison has shown that experimental results, representing flux density, correlate quite good with the results from FEM calculation.

transformer; stray flux distribution; core; stray loss; short circuit; finite element method

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