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Proceedings Paper

Fiber-optic dc current sensor for the electro-winning industry
Author(s): Klaus Bohnert; Philippe Gabus; Hubert Braendle; Peter Guggenbach
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Paper Abstract

A fiber-optic current sensor for direct currents up to 500 kA is presented. Applications include the control of the electrolysis process for the production of metals such as aluminum, copper, magnesium, etc. The sensor offers significant advantages with regard to performance and ease of installation compared to state-of-the-art Hall effect based current transducers. A novel scheme of a polarization-rotated reflection interferometer and fiber gyroscope technology is used to measure the magneto-optic phase shift. A new technique has been developed for packaging the sensing fiber in a flexible strip of fiber re-enforced epoxy for coil diameters up to several meters. The sensor can be installed without opening the current-carrying bus bars. Subsequent re-calibration is not necessary. Accuracy is within ±0.1% over a wide range of currents and temperatures.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623794
Show Author Affiliations
Klaus Bohnert, ABB Switzerland Ltd. (Switzerland)
Philippe Gabus, ABB Switzerland Ltd. (Switzerland)
Hubert Braendle, ABB Switzerland Ltd. (Switzerland)
Peter Guggenbach, ABB Switzerland Ltd. (Switzerland)

Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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