29 May 2013 Temperature sensing in high voltage transmission lines using fiber Bragg grating and free-space-optics
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Abstract
In this work we proposed the use of free-space-optics (FSO) to transmit and receive the optical signals from optical fiber placed in ground potential to the FBG fiber optics at high voltage potential, using a pair of optical collimators. The technique evaluation was performed in a prototype for the study of sensitivity to optical alignment and in an external environment using emulated sensing systems for both bus bar and overhead transmission line with real isolator chain. It has been shown that the FSO system allows collimators operate at distances of 500 mm to 2.000 mm. This range of distances is similar to the length of insulator’s chain up to 230 kV. It was also shown that the proposed system can be used in real external environment for bus bar temperature monitoring in substations, where, even if the time out of the system is of 45%, with major interruption time of almost 15 hours, the majority of the interruption time was less than 18 minutes long. On the other hand, system has to be improved in order to be used in overhead transmission line. As tested for a real isolator chain the system shown a time out of 80.3%, with significant number of events of interruption acquisition time greater than 150 minutes. It is believed that for overhead power lines, system must be installed in rigid surge arresters or in a line post where it is expected to have similar results as in substation bus bars monitoring.
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Claudio Floridia, Joao B. Rosolem, Ariovaldo A. Leonardi, Claudio A. Hortencio, Romeu F. Fonseca, Rodrigo O. C. Moreira, Giovani C. L. Souza, Altair L. Melo, Carlos A. M. Nascimento, "Temperature sensing in high voltage transmission lines using fiber Bragg grating and free-space-optics", Proc. SPIE 8722, Fiber Optic Sensors and Applications X, 87220N (29 May 2013); doi: 10.1117/12.2017934; https://doi.org/10.1117/12.2017934
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