Abstract

There are still many defects in characterizing transformer insulation aging with furfural content in oil. For example, the field measurement value and detection accuracy are generally low, and the accuracy of evaluating the aging state is not enough. To overcome this shortage, the methanol (MeOH), ethanol (EtOH) and other low molecular weight alcohols are theoretically analyzed and experimentally verified as new features of aging evaluation for insulating paper in the transformer. Thus, the main reaction and formation path of cellulose degradation to low molecular alcohols were analyzed in this work at the atomic level. With the goal of providing references for precisely estimating the paper insulation state of field transformers.

Keywords: Transformer; Insulating paper; Aging assessment; Low molecular weight alcohols

Abbreviations: DP: Degree of Polymerization; DGA: Dissolved Gas Analysis; GC-MS: Gas Chromatography- Mass Spectrometry