Quasi-distributed fiber Bragg grating temperature sensors for stator bars monitoring of large electric generators

This work presents the application of a sensor based on quasi-distributed Fiber Bragg Gratings to monitor stator bars temperature of large electric generators. The applied FBG packaging method follows industrial standard procedures, and resulted in a robust and reliable sensing method, facilitating the future installation in the power plant. Experimental results are acquired in laboratory using the expected range of temperature values in the real machine. The measurement errors in the recorded results are within the calculated uncertainties and the time constant is shorter than what is obtained with conventional RTD for the same application.

[1]  R. Kashyap.  Fiber Bragg Gratings , 1999 .

[2]  Mats Leijon,et al.  A recent development in the electrical insulation systems of generators and transformers , 2001 .

[3]  K. Frohlich,et al.  Insulation Failure Mechanisms of Power Generators [Feature Article] , 2008, IEEE Electrical Insulation Magazine.

[4]  Klaus Fröhlich,et al.  Insulation Failure Mechanisms of Power Generators , 2008 .

[5]  Peng Wang,et al.  Quasi-distributed temperature measurement for stator bars in large generator via use of Fiber Bragg Gratings , 2011, Proceedings of 2011 6th International Forum on Strategic Technology.

[6]  Li Weili,et al.  Diagnosis and numerical simulation of large hydra-generator under steady-state after heating faults of insulation aging , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[7]  X. Wen,et al.  3D transient temperature field analysis of the stator of a hydro-generator under the sudden short-circuit condition , 2012 .

[8]  G.C. Stone,et al.  Examples of stator winding insulation deterioration in new generators , 2009, 2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials.

[9]  Hypolito J. Kalinowski,et al.  Temperature sensing in a 175MW power generator , 2012, Other Conferences.

[10]  C. Sumereder,et al.  Statistical lifetime of hydro generators and failure analysis , 2008, IEEE Transactions on Dielectrics and Electrical Insulation.

[11]  Michael Willsch.  Fiber optical sensors in power generation , 2012, Asia Pacific Optical Sensors Conference.

[12]  M. Willsch,et al.  Investigation of stator coil and lead temperatures on high voltage inside large power generators via use of fiber Bragg gratings , 2002, Proceedings of IEEE Sensors.

[13]  Cicero Martelli,et al.  Thermal Imaging of Hydroelectric Generator Stator Using a DTS System , 2015, IEEE Sensors Journal.