变压器油溶解气体的FTIR定量分析

Quantitative Analysis of Transformer Oil Dissolved Gases Using FTIR

针对色谱进行变压器溶解气体在线监测需要载气、定期标定、安全性低等缺陷,试图建立一种傅里叶变换红外光谱法的油溶解气体在线分析系统。考虑特征气体量小、成分多、检测限及安全要求高,根据特征气体的吸收光谱特征与分析要求,利用分段比基线校正、改进TR正则化特征变量提取算法,建立稀疏偏最小二乘的定量分析模型。以CH4,C2H6,C3H6和CO2等特征气体为例,给出了分析的测试结果。结果表明,在光谱波数分辨率为1cm-1,光程为10cm情况下,可以满足变压器绝缘油溶解气体分析要求。

For the defects of requiring carrier gas and regular calibration,and low safety using chromatography to on line monitor transformer dissolved gases,it was attempted to establish a dissolved gas analysis system based on Fourier transform infrared spectroscopy.Taking into account the small amount of characteristic gases,many components,detection limit and safety requirements and the difficulty of degasser to put an end to the presence of interference gas,the quantitative analysis model was established based on sparse partial least squares,piecewise section correction and feature variable extraction algorithm using improvement TR regularization.With the characteristic gas of CH4,C2H6,C3H6,and CO2,the results show that using FTIR meets DGA requirements with the spectrum wave number resolution of 1cm^-1 and optical path of 10cm.