Title :
Acoustic emission measurements of ultrasound induced cavitation bubbles in aged insulating oils
Author :
Szmechta, Marek ; Boczar, Tomasz ; Zmarzly, Dariusz ; Aksamit, Pawel
Author_Institution :
Dept. of Electr. Eng., Opole Univ. of Technol., Opole, Poland
Abstract :
The paper presents the behavior of ultrasound induced cavitation voids and bubbles in mineral insulating oils with different aging properties. At suitable values of signal amplitude and frequency many of cavitation bubbles were observed. Collapsing bubbles were responsible for broadband noise included in acoustic emission signal spectra. To represent the cavitation intensity a cavitation indicator based on power spectral densities of acoustic emission signal was proposed.
Keywords :
acoustic emission; bubbles; cavitation; insulating oils; acoustic emission measurements; acoustic emission signal spectra; aged insulating oils; broadband noise; collapsing bubbles; mineral insulating oils; power spectral densities; ultrasound induced cavitation bubbles; Acoustic emission; Acoustic measurements; Aging; Frequency; Minerals; Oil insulation; Petroleum; Power transformer insulation; Ultrasonic imaging; Ultrasonic variables measurement; acoustic cavitation; acoustic emission; insulating oil; power spectral density;
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2010 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-6298-8
DOI :
10.1109/ELINSL.2010.5549780
