Abstract: The stator core loss test is of great significance to ensure the safe operation of generators. In order to verify the theory of replacing frequency excitation with high-frequency excitation, the paper conducts the corresponding tests to compare the surface and fault point heating of normal core and short-circuit core under 50~300 Hz excitation, and analyzes the results. According to the results, the rising trends of core surface temperature and fault point temperature have good consistency under the high-frequency current excitation, the increase of power supply frequency reduces the reactive power consumed by the system and raises the power factor, and the reduction of excitation current is helpful to improve the power factor.

    Key words: stator core; core loss test; abnormal frequency current