The Detection of Raman Spectra on Dissolved Gas in Transformer Oil and Its Spectral Linear Model Analysis
CHEN Xin-gang1, 2, LI Song3, MA Zhi-peng1*, NI Zhi1, YANG Ding-kun1, TAN Hao1
1. Chongqing University of Technology, Chongqing 400054, China 2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400030, China 3. Chongqing Luneng Development (Group) Co., Ltd., Chongqing 400023, China
Abstract:Raman spectroscopy gas detection technology which uses a single wavelength laser detection of gas samples without contact and loss is suitable for dissolved gas detection in oil-immersed transformers. Combined with the features of Raman spectral lines, the analysis of the detection mechanism in Raman spectroscopy technology has been made. Raman spectral lines have been presented in the expression of the convolution of Lorentz function and Gaussian function, which shows preferable Raman spectrum peak linear outline basic characteristics. In this paper, the basic features of the peak height, the peak position and the half peak width, are the main targets of peak searching, and the fundamental purpose of this paper is to obtain qualitative and quantitative analysis of the sample. Therefore, the experimental data of Raman spectroscopy is designed based on the comparison method to realize the automatic peak seeking model to achieve the detection target. Therefore, according to the automatic peak searching model based on the comparison method is designed to achieve the detection target. The simulation results of using peak searching model in the Voigt linear model show that spectrum peak height and peak position are in conformity with the theory in the test experiment. Based on the establishment of Raman spectroscopy detection platform aiming at the dissolved gas in transformer oil, the analysis of the experimental data show that the actual values of the half peak height and width are (8.7,11.5)(cm-1)in the Voigt linear model with deviations. Setting the value as 10.257 cm-1 to modify the parameter, then compared with the research results, it shows that the modified Voigt linear model and the peak searching model have better adaptability and practicability. Combined with the gas detection in the experimental platform in the experimental platform of Raman spectroscopy,detection of seven kinds of transformer fault characteristic gas and analysis of peak searching have been completed effectively. In terms of methane gas, the linear relationship among the unit gas content, Raman characteristic peak intensity and the area has been obtained, which has laid a foundation for the quantitative analysis of the dissolved gas in transformer oil.
Key words:Transformer;Dissolved gas in oil;Raman spectroscopy;Voigt linear;Peak searching
陈新岗1, 2,李 松3,马志鹏1*,倪 志1,杨定坤1,谭 昊1 . 变压器油中溶解气体拉曼光谱检测及其光谱线型模型分析 [J]. 光谱学与光谱分析, 2016, 36(08): 2492-2498.
CHEN Xin-gang1, 2, LI Song3, MA Zhi-peng1*, NI Zhi1, YANG Ding-kun1, TAN Hao1 . The Detection of Raman Spectra on Dissolved Gas in Transformer Oil and Its Spectral Linear Model Analysis . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(08): 2492-2498.
[1] HAN Ru-yue ,LI Jun-gang,et al(韩如月,李俊刚,等). High Voltage Apparatus(高压电器),2012,48(1): 58. [2] HAN Jin-hua,ZHANG Jian-zhuang(韩金华,张健壮). A Typical Large Power Transformer Fault Case Analysis and Processing(大型电力变压器典型故障案例分析与处理). Beijing: China Electric Power Press(北京:中国电力出版社),2012. [3] CHEN Wei-gen,ZHAO Li-zhi,et al(陈伟根,赵立志,等). Proceedings of the CSEE(中国电机工程学报),2014,34(15): 2485. [4] SHEN Yi,WANG Wei-guo,et al(沈 毅,王卫国,等). Trasformer(变压器),2014, 51(7): 63. [5] WANG Meng-jun,FU Qiang,et al(王梦君,付 强,等). Trasformer(变压器),2014,51(8): 73. [6] ZHANG En-ke,WANG Xue-jin,et al(章恩科,王学锦,等). High Voltage Apparatus(高压电器),2011,47(5): 83. [7] SUN Cai-xin,CHEN Wei-gen,et al(孙才新,陈伟根,等). Electrical Equipment in the Oil Gas on-line Monitoring and Fault Diagnosis Technology(电气设备油中气体在线监测与故障诊断技术). Beijing: Science Press(北京:科学出版社),2003. [8] CHEN Xin-gang,MA Zhi-peng,et al(陈新岗,马志鹏,等). High Voltage Apparatus(高压电器),2014,50(4): 35. [9] LAN Shu-li,SONG Kun,et al(兰淑丽,宋 昆,等). High Voltage Apparatus(高压电器),2008,44(4): 381.