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Optical Engineering

Extrinsic and intrinsic fiber optic interferometric sensors for acoustic detection in high-voltage environments
Author(s): Sanderson E. U. Lima; Orlando Frazão; F. M. Araujo; L. A. Ferreira; Vladimiro Miranda; José Luís Santos
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Paper Abstract

Incipient fault diagnosis is closely related to insulation condition assessment. A great number of methods are available for condition monitoring and diagnosis of power transformer insulation systems, but only few of them can take direct measurements inside the transformer. Fiber optic sensors can be applied to incipient fault diagnosis. In particular, acoustic sensors have been developed for detection and location of partial discharges in oil-filled power transformers. We report the study of extrinsic and intrinsic fiber Fabry-Pérot sensors that can be used to detect the acoustic waves that are generated by a partial discharge inside a power transformer. A comparative analysis is done to determine the best sensing head configuration and some methods to improve the parameter readout sensitivity are proposed. The sensing head behaviour when immersed in different fluids (air, water, and oil) is also investigated.

Paper Details

Date Published: 1 February 2009
PDF: 8 pages
Opt. Eng. 48(2) 024401 doi: 10.1117/1.3080752
Published in: Optical Engineering Volume 48, Issue 2
Show Author Affiliations
Sanderson E. U. Lima, INESC Porto (Portugal)
Orlando Frazão, INESC Porto (Portugal)
F. M. Araujo, INESC Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)
Vladimiro Miranda, INESC Porto (Portugal)
José Luís Santos, Univ. do Porto (Portugal)

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