油浸绝缘纸聚合度直接测量的光谱技术研究

Study on Measuring Polymerization Degree of Oil-impregnated Paper by Spectroscopy Technique

采用光谱技术,在光谱波段200~2 500 nm,结合偏最小二乘法数据处理技术,通过对不同聚合度油浸绝缘纸的研究,建立了油浸绝缘纸聚合度与光谱信息之间的定量数学模型,得出一套直接、无损测量油浸绝缘纸聚合度的方法。结果表明:采用主成分因子个数为5,平滑点数为8,选取建模的波段范围分别为:350~1 000 nm、1 100~1 600 nm和1 800~2 200 nm,所获得模型误差小。绝缘纸含油量对聚合度测量结果有较大影响,含6%左右变压器油的纸样,聚合度测量误差最大达39.15%;采取去油措施后,聚合度最大测量误差为21.07%。

A quantitative mathematical model between the polymerization degree of oil-impregnated paper and the spectral information was built by the combination of spectroscopy technique in the spectral region （200 nm to 2 500 nm） and data processing technique of partial least squares, then a straightforward and non-invasive detection method for measuring polymerization degree of oil-impregnated paper was introduced. The results show that model error reaches the minimum value when the number of principal component factor is 5, the number of smoothing point is 8, and spectral regions are 350 nm to 1 000 nm, 1 100 nm to 1 600 nm, 1 800 um to 2 200 urn, respectively. The measure result is largely influenced by oil content of oil-impregnated paper. The maximum measuring error of oil-impregnated paper polymer- ization degree with 6% of oil reaches 39.15%, which decreases to 21.07% after removing oil from paper.