1.Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming 650500 China 2.Yunnan Power Grid Corporation EPRI Kunming 650217 China
Abstract：In order to monitor the solidification condition of the dry-type air core reactor,we develop a fiber Bragg grating strain sensor to achieve on-line monitoring for reactor encapsulated strain in solidification.In the production of the dry-type air core reactor encapsulation,the sensor is embedded within the encapsulation so as to monitor the encapsulated strain changes during the solidification process.The results of monitoring show that the shrinkage of the colloid produces negative strain during the solidification process.When the furnace temperature exceeds 50℃,the negative strain of the encapsulation increases gradually with the growth of the solidification time.After about 8 hours,it tends to be stable.The encapsulation is basically solidified completely at this moment.In the cooling process,the strain increases along the negative direction,and stabilizes at around -5 500 με after reaching the room temperature.The monitoring of the encapsulated strain during the solidification process is of significance for ensuring the quality and improving the mechanical properties of the reactor.
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2015, Vol. 30 
