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Proceedings Paper

All-fiber interferometric sensor of 150kHz acoustic emission for the detection of partial discharges within power transformers
Author(s): Julio E. Posada; Jesus Rubio-Serrano; Jose A. Garcia-Souto
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Paper Abstract

An all-fiber interferometric acoustic emission (AE) sensor was designed for partial discharges (PD) and characterized against typical PZT sensors (R15i). The device is based on a multi-layer fiber-optic probe and it is able to detect PD ultrasound emission at 150 kHz. It may be placed next to the discharge source immersed in oil - or as an ultrasonic hydrophone -, thus overcoming the difficulties of acoustic attenuation which are characteristic of the external detection on the walls. The device provides suitable narrowband acoustic detection of the PD activity, like the PZT transducers mounted on the exterior of the transformer tank. The results show similar sensitivity, but wider directivity of the fiberoptic sensor in order to inspect large zones within the tank. It represents a simple and cheap alternative for detecting AE and it is the base of a multi-channel heterodyne interferometer which will drive at least four sensors to provide information for locating the source.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77531S (17 May 2011); doi: 10.1117/12.885511
Show Author Affiliations
Julio E. Posada, Univ. Carlos III de Madrid (Spain)
Jesus Rubio-Serrano, Univ. Carlos III de Madrid (Spain)
Jose A. Garcia-Souto, Univ. Carlos III de Madrid (Spain)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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