This paper reports on the first realisation of embedding fiber Bragg grating temperature sensors inside the stator bars and onto the leads of a 200MVA air cooled power generator. The worlds first measurements of the conductor temperature on high potential during a generator prototype test run demonstrates the feasibility and importance of this measuring technology.

Gas turbines for power generation are being operated on the physical limits of materials and structures. A save operation requires more monitoring of critical components. Optical, acoustic and RF waveguides could be used to access the harsh environment inside of gas turbines for monitoring purposes.

For the first time online temperature measurements with FBG temperature sensors on railway overhead lines could be demonstrated.All sensors measured successfully under outdoor conditions over a two year period. As a first experimental result the excess temperatures due to current load are small compared to ambient sources of temperature change. In the future this first result will be analyzed under different seasonal and current load conditions. Furthermore the modelling and first field test have demonstrated the possibility to acquire information about the interaction between OCL and current collector via optical strain gauges integrated into conventional current collector strips

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