How is furan analysis of transformer oil performed?

Furan analysis of transformer oil is performed by extracting furan compounds from the oil sample, typically using solvent extraction methods. The extracted furan compounds are then analyzed using techniques such as High-Performance Liquid Chromatography (HPLC) or Gas Chromatography-Mass Spectrometry (GC-MS). This analysis quantifies the concentration of furan derivatives, which are indicators of paper insulation degradation, thus providing insights into the condition of the transformer.