Chemical indicators and ageing diagnosis of MV/LV distribution transformers

This article presents the investigations carried out on the MV/LV transformers for the use of methanol (MeOH) and furfuraldehyde (2-FAL) as indicators of the transformer ageing state under operating conditions. In parallel, an accelerated ageing experiment of paper-oil system in sealed vials confirmed the production of MeOH and 2-FAL and showed the relation between their concentrations in oil and the degree of polymerization (DPv) of the paper.