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The increasing quantity of renewable energy in electric power generation leads to a higher flexibility in the operation of conventional power plants. Especially the turbo generator having the highest energy density has to face the influence of frequent start-stop-operation on thermal movement and vibration of the stator end windings. Large indirect cooled turbo generators have been equipped with newly designed FBG strain and temperature sensors to monitor the influence of peak load operation on transient mechanical and thermal load stress in the end winding structure. Well approved fiber optic accelerometers measure the vibration of the end windings at several turbine generators since many years of operation. The long term reliability of fiber optic vibration, temperature and strain sensors could be successfully proved during years of online operation. Analysis of these data in correlation to significant operation parameter would lead to important diagnostic information of end winding behaviour within the years and is a required key information for life time assessment of the stator winding.

proceedings sensor 2013

D8.3 - Experience with Special Fiber Optic Sensors for Online Monitoring of High Voltage Stator Windings at Large Turbine Generators - Long Term Reliability and Machine Operation Diagnosis -