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Proceedings Paper

Development of hydrogen sensors based on fiber Bragg grating with a palladium foil for online dissolved gas analysis in transformers
Author(s): Maximilian Fisser; Rodney A. Badcock; Paul D. Teal; Adam Swanson; Arvid Hunze
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Paper Abstract

Hydrogen evolution, identified by dissolved gas analysis (DGA), is commonly used for fault detection in oil immersed electrical power equipment. Palladium (Pd) is often used as a sensing material due to its high hydrogen absorption capacity and related change in physical properties. Hydrogen is absorbed by Pd causing an expansion of the lattice. The solubility, and therefore lattice expansion, increases with increasing partial pressure of hydrogen and decreasing temperature. As long as a phase change is avoided the expansion is reversible and can be utilized to transfer strain into a sensing element. Fiber Bragg gratings (FBG) are a well-established optical fiber sensor (OFS), mainly used for temperature and strain sensing. A safe, inexpensive, reliable and precise hydrogen sensor can be constructed using an FBG strain sensor to transduce the volumetric expansion of Pd due to hydrogen absorption. This paper reports on the development, and evaluation, of an FBG gas sensing OFS and long term measurements of dissolved hydrogen in transformer mineral oil. We investigate the effects of Pd foil cross-section and strain transfer between foil and fiber on the sensitivity of the OFS. Two types of Pd metal sensors were manufactured using modified Pd foil with 20 and 100 μm thickness. The sensors were tested in transformer oil at 90°C and a hydrogen concentration range from 20- 3200 ppm.

Paper Details

Date Published: 26 June 2017
PDF: 9 pages
Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103292P (26 June 2017); doi: 10.1117/12.2267091
Show Author Affiliations
Maximilian Fisser, Victoria Univ. of Wellington (New Zealand)
Rodney A. Badcock, Victoria Univ. of Wellington (New Zealand)
Paul D. Teal, Victoria Univ. of Wellington (New Zealand)
Adam Swanson, Callaghan Innovation (New Zealand)
Arvid Hunze, Victoria Univ. of Wellington (New Zealand)


Published in SPIE Proceedings Vol. 10329:
Optical Measurement Systems for Industrial Inspection X
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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