TDLAS-Based Detection of Dissolved Methane in Power Transformer Oil and Field Application
TDLAS-Based Detection of Dissolved Methane in Power Transformer Oil and Field Application
复制标题
基于TDLAS的电力变压器油溶解甲烷检测及现场应用
DOI：
10.1109/jsen.2017.2788871
复制
发表时间：
2018-03-15
影响因子：
4.3
通讯作者：
Zhang, Chaohai
中科院分区：
文献类型：
--
作者：
Jiang, Jun;Zhao, Mingxin;Zhang, Chaohai
Methane is one of the indicative gases in power transformer oil, and the detection of methane dissolved in oil with high accuracy is of great importance for dissolved gases analysis and fault diagnosis inside power transformers. Based on the Beer-Lambert spectral absorption law, dissolved methane detection with tunable diode laser absorption spectrum (TDLAS) is proposed in this paper for the advantages of high sensitivity and resolution. On the basis of wavelength modulation spectroscopy, a specialized TDLAS system was established. To meet the actual needs of field testing, the anti-vibration design of an integrated Herriott cell and a gas pressure (P)/temperature (T) setting are worked out. Photodetector, collimator, and Herriott cell are integrated into one component to reduce the effects of vibration. It is investigated that the temperature has little effect on the second harmonic amplitude in the range of 30 degrees C similar to 50 degrees C, and the vacuum pressure is reasonably set at about 1 kPa. Experimental results showed that the resolution of sensitivity could be reached as 6.8 mV/(mu L/L), the maximum deviation was less than +/-4 mu L/L, and the response time is less than 5 min. In the end, field application was also carried out, proving it is a prospective online sensing technique to serve oil-immersed power transformers better.
