Аналіз отриманих частотних характеристик силового трансформатора та визначення його технічного стану з їх допомогою

Abstract

The article proposes to first determine the ST defect by comparing and analyzing the frequency response of the sample of the studied ST with the current frequency response of the same ST. Frequencies at which more than normal deviations of the frequency response are detected indicate a certain type of defect. Thereafter, in order to reduce the errors of the first (existing defect not identified) or second (misidentified non-existent defect) type, during the diagnosis of CT it is proposed, in case of suspicion of the defect, to repeat the frequency response a reasonable number of times. Next, you need to determine the average values of the deviations of the sample and the current frequency response and the frequency range that corresponds to them. These frequency ranges allow to substantiate or refute the conclusion about this or that type of CT defect. For an exemplary frequency response, it is proposed to take the frequency response of the CT obtained at the factory of the CT manufacturer after the recognition of the CT is working (immediately after the commissioning of the CT or after repair work on the CT). The obtained frequency response of CT type TMG 1000/10 U1 was investigated. However, in the frequency range 6060 ÷ 7010 Hz, sharp deviations were observed, which were previously removed from the calculations, considering them omitted. Additional measurements of the frequency response were performed, which showed the same deviations in the frequency range 6060 ÷ 7010 Hz as in the previous measurements. These results indicate a probable defect of the axial deformation of the CT windings. Additional CT scans were performed, which indicated a possible axial displacement of the turns of the winding of the studied CT at an early stage of development.