Investigating the Survival and Hazards of Dissolved Gases in Transformer Oil Using DGA history

Distribution and Power Transformers (DPTs) have been safely insulated using Transformer Oil (TO) for many years in the commercial sector. The loaded DPTs will ultimately experience both environmental pressures like dampness and thermal stressing. The gases released at each early malfunction in the DPTs enclosure are a crucial indicator of the DPTs’ failure. Dissolved Gases (DG), also known as key gases (KG), are the gases that are present in the headspace of DPTs and will eventually form the oil insulation. These gases include hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), and acetylene (C2H2). In this study, the survival and hazard functions were determined using the DG dataset, which included the history of more than 150 different samples. The DPTs’ health index: the distribution analysis of density, cumulative probability, and probability. Overall, the application of distribution analysis to evaluate survival and risk informs the KG’s mathematical models. The mathematical model demonstrates that all the KG except the C2H2 danger are present at a later stage of the DPTs. Only 10% of the DG dataset survives at 50% survival, whereas 90% fails. Each KG contributes H2-27%, CH4-28%, C2H6-40%, C2H4-30%, and C2H2-40% to the total hazard. As a result of utilizing the generalized extreme value (GEV) functions, the hazard rate is H2-21%, CH4-17%, C2H6-29%, C2H4-22.5%, and C2H2-14%. These conditions are equivalent to mathematical models and raise awareness of the importance of focusing on the four KG in minimizing transformer failures.