One of the main factors that affect transformer insulation aging is the core temperature. The higher the core's temperature is, the faster the insulation degrades and the shorter the transformer's life is. a design of sensor using optical Fiber Bragg Grating (FBG) was introduced to measure the transformer core temperature, which takes advantage of the slot on the core of the transformer to install the optical fiber Bragg ceramic casing grating temperature sensor on the core in column yoke surface of the transformer. When the temperature of core changes, the temperature of the optical fiber Bragg grating will vary with the core changes, which make the central wavelength of optical fiber Bragg grating shift, so the temperature of the core can be measured. When the running voltage is 75 V and 100 V respectively, the constant load experiments show that, under the constant voltage, when the ambient temperature is 15℃, in 0~105 minutes, the center wavelength of optical fiber Bragg grating stabilizes at 1 552.289 nm and 1 552.299 nm respectively, and the temperature rise are 17℃and 18℃respectively.% 影响变压器绝缘老化的主要因素之一是运行时铁芯的温度.铁芯温度越高,绝缘老化越快,变压器寿命也就越短.研制了一种利用光纤Bragg光栅测量变压器铁芯温度的传感器,将套有陶瓷套管的光纤Bragg光栅温度传感器安装在变压器铁芯中柱上轭表面.当铁芯的温度发生改变时,与其接触的光纤Bragg光栅的温度也随之改变,导致光纤Bragg光栅中心波长移位,从而实现对变压器铁芯温度的测量.运行电压为75 V和100 V的恒定负载实验表明,恒定电压下,环境温度为15℃时,0~105 min内光纤Bragg光栅中心波长分别稳定在1552.289 nm和1552.299 nm,变压器铁芯的温升值分别为17℃和18℃.
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