Ma G M, Jiang J, Li C R, Song H T, Luo Y T, Wang H B
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People's Republic of China.
Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, People's Republic of China.
Rev Sci Instrum. 2015 Apr;86(4):045003. doi: 10.1063/1.4918802.
Compared with conventional DGA (dissolved gas analysis) method for on-line monitoring of power transformers, FBG (fiber Bragg grating) hydrogen sensor represents marked advantages over immunity to electromagnetic field, time-saving, and convenience to defect location. Thus, a novel FBG hydrogen sensor based on Pd/Ag (Palladium/Silver) along with polyimide composite film to measure dissolved hydrogen concentration in large power transformers is proposed in this article. With the help of Pd/Ag composite coating, the enhanced performance on mechanical strength and sensitivity is demonstrated, moreover, the response time and sensitivity influenced by oil temperature are solved by correction lines. Sensitivity measurement and temperature calibration of the specific hydrogen sensor have been done respectively in the lab. And experiment results show a high sensitivity of 0.055 pm/(μl/l) with instant response time about 0.4 h under the typical operating temperature of power transformers, which proves a potential utilization inside power transformers to monitor the health status by detecting the dissolved hydrogen concentration.
与用于电力变压器在线监测的传统溶解气体分析（DGA）方法相比，光纤布拉格光栅（FBG）氢传感器在抗电磁场干扰、节省时间以及便于故障定位方面具有显著优势。因此，本文提出了一种基于钯/银（Pd/Ag）与聚酰亚胺复合膜的新型FBG氢传感器，用于测量大型电力变压器中的溶解氢浓度。借助Pd/Ag复合涂层，该传感器在机械强度和灵敏度方面表现出增强的性能，此外，通过校正曲线解决了油温对响应时间和灵敏度的影响。在实验室中分别对特定氢传感器进行了灵敏度测量和温度校准。实验结果表明，在电力变压器的典型工作温度下，该传感器具有0.055 pm/(μl/l)的高灵敏度，即时响应时间约为0.4小时，这证明了其在电力变压器内部通过检测溶解氢浓度来监测健康状态的潜在应用价值。
