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Sensors 2012, 12(4), 4793-4802; doi:10.3390/s120404793

Fiber Optic Sensor for Acoustic Detection of Partial Discharges in Oil-Paper Insulated Electrical Systems

Department of Electronics Technology, Optoelectronics and Laser Technology Group, Universidad Carlos III de Madrid, Av. Universidad 30, E-28911 Leganés, Madrid, Spain
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Received: 16 January 2012 / Revised: 31 March 2012 / Accepted: 5 April 2012 / Published: 12 April 2012
(This article belongs to the Special Issue Optical Fiber Sensors 2012)
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Abstract

A fiber optic interferometric sensor with an intrinsic transducer along a length of the fiber is presented for ultrasound measurements of the acoustic emission from partial discharges inside oil-filled power apparatus. The sensor is designed for high sensitivity measurements in a harsh electromagnetic field environment, with wide temperature changes and immersion in oil. It allows enough sensitivity for the application, for which the acoustic pressure is in the range of units of Pa at a frequency of 150 kHz. In addition, the accessibility to the sensing region is guaranteed by immune fiber-optic cables and the optical phase sensor output. The sensor design is a compact and rugged coil of fiber. In addition to a complete calibration, the in-situ results show that two types of partial discharges are measured through their acoustic emissions with the sensor immersed in oil. View Full-Text
Keywords: optical fiber sensors; interferometry; acoustic emission; ultrasounds; partial discharges; transformers optical fiber sensors; interferometry; acoustic emission; ultrasounds; partial discharges; transformers
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MDPI and ACS Style

Posada-Roman, J.; Garcia-Souto, J.A.; Rubio-Serrano, J. Fiber Optic Sensor for Acoustic Detection of Partial Discharges in Oil-Paper Insulated Electrical Systems. Sensors 2012, 12, 4793-4802.

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