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为了监测干式空心电抗器的固化情况,研制出一种光纤Bragg光栅(Fiber Bragg Grating,FBG)应变传感器,实现了固化中电抗器包封应变的在线监测。在制作干式空心电抗器包封时,将传感器埋入干式空心电抗器包封内,在固化过程中监测包封的应变变化情况。监测结果表明,固化过程中胶体收缩产生负向的应变,当炉温超过50℃后,包封的负向应变量随固化时间的增长而逐渐增大,约8 h后应变量趋于稳定,此刻包封基本固化完全。降温过程中应变量沿负向增加,达到室温后稳定在-5 500με左右。监测固化过程包封应变,对保障电抗器的质量和提高电抗器的机械性能具有重要意义。
In order to monitor the curing condition of dry hollow reactor, a fiber Bragg grating (FBG) strain sensor was developed to realize on-line monitoring of reactor encapsulation strain during solidification. When making a dry hollow reactor envelope, the sensor is embedded in the dry hollow reactor envelope and the enveloped strain is monitored during the curing process. The monitoring results show that the colloid shrinkage during curing produces negative strain. When the temperature exceeds 50 ℃, the negative strain of encapsulation increases with the increase of curing time, and the strain tends to be stable after about 8 h. At this moment, the basic curing is complete. During cooling, the amount of strain increases in the negative direction and stabilizes at -5 500με after reaching room temperature. Monitoring the curing process encapsulation strain, to protect the quality of the reactor and improve the mechanical properties of the reactor is of great significance.