Detection of defects in on-load tap-changers using acoustic emission method

An expert system for acoustic diagnosis of power circuit breakers and on-load tap changers

“…A PhD thesis has been presented in Adelaide University by analyzing the vibro-acoustics of transformers and their application in the condition monitoring of power transformers (Wang, Eng, & Eng, 2015). A study for mathematically modeling the acoustic signal of OLTCs has been presented in (Cichon, Borucki, & Wotzka, 2014) and methods for extracting characteristics of the acoustic signals generated by OLTCs during operation have been analyzed by (Cichoń & Frącz, 2012). A method for analyzing the arching process in OLTCs based on acoustic signals has been discussed in (Bhuyan & Mor, 2014).…”

Introduction to Special Issue on Symmetry in Mechanical Engineering

“…The mechanical properties of materials are also investigated in the literature [26][27][28]. Acoustic analysis is also profitable for the analysis of the power transformer and detection of defects in on-load tap-changers [29,30]. Acoustically induced cavitation bubbles in insulating oil are also presented in the literature [31].…”

Vibro-Acoustic Methods in the Condition Assessment of Power Transformers: A Survey

“…Experimental results demonstrate that for the proper diagnostics of transformer core and windings based on vibroacoustic measurements it is usually enough to observe the frequency spectrum in the range up to 1 kHz [14], [15], although harmonics up to 2 kHz were observed in [16] and [17]. On the other hand, OLTC diagnostics require observation of a higher frequency range-up to 10 kHz [18], although some authors [19]- [21] observed a much higher frequency spectra (even up to several hundreds of kHz) in order to be able to apply some digital filtration techniques, or to be able to observe not only acoustic events of the mechanical origin, but also other events, e.g. emergence of electric arc or events related to PD activity.…”