Title :
Analysis of acoustic signals generated by partial discharges in insulation oil
Author :
Choi, Su-Yeon ; Park, Dae-Won ; Kim, Il-Kwon ; Park, Chan-Yong ; Kil, Gyung-suk
Author_Institution :
Korea Maritime Univ., Busan
Abstract :
This paper dealt with the frequency analysis of acoustic signals generated by partial discharge (PD) in insulation oil and the positioning of PD occurrence to apply in the diagnosis of oil insulated transformers. We assembled three types of electrode system; the needle-plane, the plane-plane, and the floating to simulate partial discharge in insulation oil. An acoustic signal detection device was designed to detect acoustic signal with high sensitivity. As a result of frequency spectrum analysis, the frequency ranges of acoustic signal were 70 kHz~210 kHz in the needle-plane, 80 kHz~270 kHz in the plane-plane, and 60 kHz~193 kHz in the floating electrode. Their main frequencies were 132 kHz, 130 kHz and 126 kHz, respectively. The position of PD occurrence was calculated by the time difference of arrival (TOA) using three acoustic emission (AE) sensors and we could find the position about the error of 1% in the experimental apparatus.
Keywords :
acoustic emission testing; acoustic signal detection; electrodes; insulation testing; partial discharge measurement; power transformer insulation; power transformer testing; time-of-arrival estimation; transformer oil; acoustic emission sensors; acoustic signal detection; acoustic signal generation; floating electrode system; frequency 60 kHz to 193 kHz; frequency 70 kHz to 210 kHz; frequency 80 kHz to 270 kHz; frequency spectrum analysis; insulation oil; needle-plane electrode system; oil insulated transformer diagnosis; partial discharges; plane-plane electrode system; time difference of arrival; Acoustic devices; Acoustic signal detection; Electrodes; Frequency; Oil insulation; Partial discharges; Petroleum; Power transformer insulation; Signal analysis; Signal generators; Acoustic signal; Diagnosis; Electrode system; Frequency spectrum analysis; Insulation oil; Partial discharge (PD); Position; Time difference of arrival (TOA);
Conference_Titel :
Condition Monitoring and Diagnosis, 2008. CMD 2008. International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-1621-9
Electronic_ISBN :
978-1-4244-1622-6
DOI :
10.1109/CMD.2008.4580341
