The paper model prediction can be improved by measuring
furfural content within the oil. The furfural method is an additional, indirect way to obtain the paper DP-value by measuring the furfural content from the transformer oil. Furfural (2-furaldehyde or 2-FAL) is one of the main products that are released due to the degradation of all cellulose containing materials inside the transformer. The furfural content can be measured by High Performance Liquid Chromatography (HPLC)