点击次数：

所属单位：自动化学院

发表刊物：IEEE SENSORS JOURNAL

关键字：Transformer oil oil-immersed transformers methane infrared absorption spectrum dissolved gases analysis

摘要：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.

ISSN号：1530-437X

是否译文：否

发表时间：2018-03-15

合写作者：Zhao, Mingxin,Ma, Guo-Ming,Song, Hong-Tu,Li, Cheng-Rong,占小红,张潮海

通讯作者：江军