Repozytorium publikacji - Politechnika Gdańska

The article deals with the issue of the numerical analysis of the magnetic field occurring around the transformer after it has been powered down. The main goal of this analysis was to examine if it is possible to identify the residual fluxes in the transformer legs based on this fields’ measurements. It was also intended to determine the type and the location of magnetic sensors. Numerical analysis of the magnetic field was performed. A three-dimensional model of the transformer magnetic core was created in the Flux 3D simulation program. The research concerned an oil-filled transformer and a dry transformer. The magnetic field of Earth was taken into account. The research has shown that magnetic induction of leakage field produced by residual magnetization of the core is comparable to magnetic induction of the Earth's field. It was also found that the measurement of magnetic induction should be performed as close as possible to the core. The interior of the tank turned out to be a convenient space for the sensors placement . The influence of external ferromagnetic objects, and devices generating magnetic field, on the measurement was not considered. This influence should be taken into account in the future work. On the basis of the results it was proposed to measure the magnetic induction vector of the leakage field at three points. The sensors should be placed in front of the columns at half of their height. The measurement can be performed with satisfactory accuracy by sensors located on the surface of the windings.

Autorzy

• dr hab. inż. Jacek Horiszny link otwiera się w nowej karcie