YANG Hong-lei, XIONG Xin, LIANG Shi-bin, et al. Research of depth adjustable FBG oil temperature sensor for transformer[J]. 2014, 33(2): 47-49+53. DOI: 10.13873/j.1000-97872014.02.004.
Oil temperature exceedes the permitted limit means the oil-immersed power transformer operating abnormally.A depth adjustable oil temperature sensor with fiber Bragg grating(FBG) is developed.The center wavelength of the FBG can be only changed by temperature
FBG in the sensor is suspended.Through the pip at the top of transformer
the sensor is immersed in top oil
and the depth can be adjusted by rotating the adjusting nut.The temperature of the oil-immersed power transformer can be detected by detecting the center wavelength of the FBG in sensor.Experiment indicates that the sensitivity of the sensor is 9.8 pm / ℃