Exploration on use of ferrofluid in power transformers

During normal operating conditions, the thermal fluctuation in a power transformer is controlled by the mineral insulating oil that acts as cooling media and keeps the transformer in thermal equilibrium. Feasibility of ferrofluid in power transformers and compatibility with the transformer components have been quite an area of interest even after it has surfaced as a possible dielectric fluid with enhanced heat dissipation capacity. The experimental contributions in this research are dedicated towards the comparison of ferrofluid and naphthenic oil with kraft paper where major emphasis has been laid on the results obtained from long term laboratory scale ageing of ferrofluid for 61days at 393 K (120°C) with respect to the dissolved gas analysis (DGA), moisture, and degree of polymerization (DP) of solid insulation along with oxidation stability and Rotating Bomb Oxidation Test (RBOT) with kraft paper.