All-fiber interferometric sensor of 150kHz acoustic emission for the detection of partial discharges within power transformers

Julio E. Posada; Jesus Rubio-Serrano; Jose A. Garcia-Souto

doi:10.1117/12.885511

17 May 2011 All-fiber interferometric sensor of 150kHz acoustic emission for the detection of partial discharges within power transformers

Julio E. Posada, Jesus Rubio-Serrano, Jose A. Garcia-Souto

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77531S (2011) https://doi.org/10.1117/12.885511
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Julio E. Posada, Jesus Rubio-Serrano, and Jose A. Garcia-Souto "All-fiber interferometric sensor of 150kHz acoustic emission for the detection of partial discharges within power transformers", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77531S (17 May 2011); https://doi.org/10.1117/12.885511

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