Dissolved gases analysis comparison of electrical faults between rice bran oil and mineral oil insulation systems

Dissolved gas analysis (DGA) of transformers can reveal electrical stresses encountered by oil-immersed power
transformers. DGA can identify potential transformer failures, which allows it to potentially prevent further damage from occurring. Mineral Oil (MO) and Rice Bran Oil (RBO) have both been used as conventional transformer oils for the purpose of this study, and a comparison of their DGA evaluations under electrical breakdown faults has been carried out. RBO has excellent oxidation stability and benefits in terms of both price and accessibility. Therefore, this study focuses on RBO as a sustainable option to petroleum-based MO for transformer oil. The many approaches developed for analyzing these gases and
interpreting their significance include Key Gas, Duval Triangle and Pentagon Method, Doernenburg Ratio, Rogers Ratio, and IEC Ratio. The diagnostic approaches were not completely reliable for identifying electrical faults in RBO. The findings suggest that present DGA interpretation procedures for RBO or vegetable oil shall be properly modified. In the case of MO, however, DGA analysis indicated that there is a thermal crack in the oil sample that must be addressed.