Quantitative analysis method for furan of deteriorated insulating oil

摘要

The disclosed method for quantitative analysis of deteriorated insulating oil furan is characterized in that furfural extracted from an insulating oil sample using an extraction solvent is colorimetrically analyzed with a substituted aniline derivative and an acid catalyst, and then quantitatively analyzed by a colorimetric system, and the extraction solvent from the insulating oil sample A simple kit for quantitative analysis of deteriorated insulating oil furan in which the extracted furfural is colored with a substituted aniline derivative and an acid catalyst and then quantitatively analyzed using a colorimetric system, comprising: a mixing container in which the insulating oil sample and the extraction solvent are mixed; a mixer for extracting the furfural by rotating the mixing vessel to mix the insulating oil sample and the extraction solvent; a layer separation container in which the insulating oil sample and the extraction solvent mixed by the mixer are accommodated; a cock valve connected to the lower end of the layer separation container to selectively discharge the furfural solution containing the furfural extracted from the insulating oil sample; a colorimeter for measuring absorbance by irradiating light to an absorbance analysis sample in which the substituted aniline derivative and the acid catalyst are mixed in the discharged furfural solution; and a calculator for calculating the concentration of furfural from the absorbance measured by the colorimeter.