Diagnostyka rdzenia transformatora elektroenergetycznego z wykorzystaniem zmodyfikowanej metody wibroakustycznej

Genezę podjętych w artykule prac stanowi problem skutecznej oceny stanu technicznego konstrukcji mechanicznej rdzeni transformatorów elektroenergetycznych. W publikacji zaprezentowano wyniki wskazujące na możliwość opracowania nowej i bezinwazyjnej metody diagnostycznej rdzeni z wykorzystaniem zaproponowanej przez autora tzw. zmodyfikowanej metody wibroakustycznej (MVM). Zamieszczone w artykule oryginalne rezultaty badań uzyskano podczas prób laboratoryjnych z wykorzystaniem transformatora olejowego o mocy 200 kVA.

The problem of effective assessment of the technical condition of power transformer core mechanical structure originated the research work discussed in this paper. The investigation results show the possibility of developing a new and non-invasive diagnostic method for the transformer magnetic circuit. The method developed is based on time-frequency analysis of measured mechanical vibrations of the device monitored. The recording of vibrations is performed during the monitored transformer no-load operation. The paper characterises the power object under study (Fig. 1), the measuring system applied and discusses the new methodology for assessing the core technical condition using the modified vibroacoustic method (MVM). The original measurement results presented in the paper were obtained during switching on a 200 kVA transformer under laboratory conditions. The analysis of the signals measured was carried out for three operating conditions of the transformer under study: with the core pressed by a manufacturer; with the core with loose screws fixing the upper yoke (Fig. 2a) and with the core with loose screws fixing the upper and lower yokes (Fig. 2b). The research results (Figs. 3-5) obtained from this experiment show a potential possibility of developing a non-destructive and effective method for assessing the technical condition of the core mechanical structure of transformer units operating in the electric power system, especially the ones of a strategic character.