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Thermal Imaging of Hydroelectric Generator Stator Using a DTS System

2015; IEEE Sensors Council; Volume: 15; Issue: 11 Linguagem: Inglês

10.1109/jsen.2015.2465862

1558-1748

João Paulo Bazzo, Felipe Mezzadri, Erlon Vagner da Silva, Daniel Rodrigues Pipa, Cícero Martelli, Jean Carlos Cardozo da Silva,

Advanced Fiber Optic Sensors

This paper presents a new method for thermal imaging of hydroelectric generators stators. The method is based on distributed temperature optical fiber sensing using Raman scattering. The thermal image is generated by combining the information of temperature and the spatial position of the sensor with the 3-D model of the structure. Regarding the use of conventional sensors, such as resistance temperature detector or PT100, the main advantage is the possibility to identify temperature variations over the entire stator surface. The results were obtained over a 22-h test with a 200-MW hydroelectric generator. The produced thermal images showed a great potential for monitoring the temperature distribution in the stator according to the generator load. The new method can contribute for identification of fault in the structure insulation, which when early identified can reduce damage caused by short circuit in the stator windings.