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Acoustic monitoring of HV equipment with optical fiber sensor

This paper presents the preliminary results on the application of optical fiber sensor (OFS) for the measurements of discharging signals in insulating oil. An all-optical-fiber-sensing system using a Mach-Zehnder interferometry technique was constructed. It was found that the discharging signal produced by needle-sphere electrodes could be detected by OFS, which was confirmed by current probe and PZT sensor. By quantification of acoustic signal measured by OFS, a correlation between acoustic and electrical discharge signals was observed.