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| Dissolved Hydrogen Sensor in Power Transformer Oil Based on Side Polishing Fiber Bragg Grating |
| Jiang Jun1, Ma Guoming2, Song Hongtu2, Li Chengrong2, Luo Yingting3 |
1. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China;
2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
3. Electric Power Research Institute of Guangdong Power Grid Co. Ltd Guangzhou 510080 China |
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Abstract Procedures of oil sampling, oil-gas separation and gas detection are generally adopted to measure dissolved gases in power transformer oil. However, there are several disadvantages in the conventional methods, such as the complicated operation, large measurement error, long test cycle and so on. To solve these problems, fiber Bragg grating (FBG) dissolved hydrogen sensor and the related detection scheme in transformer oil are proposed. In order to improve the sensitivity of FBG hydrogen sensor, side polishing technique is utilized due to its sensitivity to bending deformation. Then, based on the wheel grinding method and magnetron sputtering on fiber surface with palladium membrane, side polishing FBG sensors with the polishing depth of 20μm were prepared and fabricated. Furthermore, a hydrogen sensing and testing platform was built in the laboratory. Hydrogen sensing experiments were carried out to examine the sensitivity and repeatability. The results show that the sensitivity reaches up to 0.477μL/L, and high repeatability is also verified. Direct measurement of dissolved gas in transformer oil is achieved based on side polishing FBG hydrogen sensor, providing a novel sensing technique for on-line monitoring of hydrogen dissolved in transformer oil.
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Received: 28 December 2015
Published: 19 July 2017
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2017, Vol. 32 
