Correlation of transformer paper deterioration to oil characteristics and dissolved gases

Abstract

Dissolved Gases and Oil Characteristics are widely available data for detecting faults and evaluating condition of oil-impregnated power transformers. This paper presents the statistical insights of the effect of transformer paper deterioration to oil insulation. The oil characteristics, dissolved gases, and 2FAL data of 108 Indonesian transformers are collected. 2FAL is used as paper condition parameter and then directly linked to the degree of polymerization estimated (DPest). The correlation analysis is done using simple linear regression to find several most correlated parameters to transformer paper deterioration. The result is CO and CO2 is the most correlated dissolved gases to transformer paper condition. CO and CO2 have long been recognized as one of the cellulose degradation products. The oil characteristics data shows high correlation of interfacial tension (IFT), acidity, and color to the transformer paper aging condition. Finally, the result is compared to the standard.