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Energized parts within power transformer are isolated using paper insulation and are immersed in insulating oil. Hence, transformer oil and paper insulation are essential sources to detect incipient and fast developing power transformer faults. Several chemical diagnoses techniques are developed to examine the condition of paper insulation such as degree of polymerization, carbon oxides, furanic compounds and methanol. The principle and limitation of these diagnoses are discussed and compared in this paper. [ABSTRACT FROM PUBLISHER]

Examples of electrical insulations for transformer are mineral oil and cellulose based paper. The said insulations degraded as transformers performed their work, while the most critical component of the transformer insulation system is the paper insulation. It is not easily replaced as compared to oil where it is easily reconditioned in-order to remove water and contaminants. Studies on paper insulation showed that temperature, oxygen and moisture contents contributed to its degradation. Moisture and Furan were produced from these deterioration processes. The paper is focused on the effect of oxygen and moisture contents to deterioration rate of Kraft paper insulation and end-of-life analysis using 2 Furaldehyde (2FAL). Level of temperature, oxygen, moisture contents and 2FAL were obtained from in-service distribution power transformers. Assessments were then carried out on these collected data to determine the effect of oxygen and moisture contents to 2FAL formation. Categorizations were then carried out on 2FAL data for end-of-life analysis using Weibull as a life data analysis. This study shows that moisture give more implication to paper insulation degradation rate compared to oxygen and the end-of-life in years derived from Weibull probability function can be used to estimate the life of paper insulation. [ABSTRACT FROM PUBLISHER]

Paper presents a review of past research on factors influencing bubble formation in transformer mineral oils. Previous research done by Monash University is also presented and compared to as the equipment and method will form the basis of future research using vegetable transformer oils. Results of past experiments show that bubble formation depends on: the moisture content of paper, the gas content of oil, the quality and age of the insulation material and rate of temperature rise. A brief description of future work and expectations are presented. The result will be used for additional considerations of the use of vegetable oil as a substitute for mineral oil. [ABSTRACT FROM PUBLISHER]