Enhancing The Breakdown Voltage Of Natural Ester Insulating Oil By Optimizing Mixed Antioxidants For Power Transformer Applications

Ambo, Nur Farhani (2016) Enhancing The Breakdown Voltage Of Natural Ester Insulating Oil By Optimizing Mixed Antioxidants For Power Transformer Applications. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text Enhancing The Breakdown Voltage Of Natural Ester Insulating Oil By Optimizing Mixed Antioxidants For Power Transformer Applications - Nur Farhani Ambo - 24 Pages.pdf - Submitted Version Download (292kB)

Abstract

In power transformer applications, an attempt has been made to replace mineral oil with natural ester insulating (NEI) oil due to environmental issues becomes more concern. However, NEI oil is prone to oxidation due to its poor oxidative stability which can be improved by adding the antioxidants to the oil. Besides, recent studies also showed that the use of selected antioxidants also improves the breakdown voltage (BDV) of the oil. Meanwhile, previous researchers were design their experiments using the conventional one-factor-at-a-time (OFAT) method which requires more tested samples in determining the optimum response studied. Thus, a two-level (22) factorial design experiment is introduced in this study to replace conventional OFAT method. This method is capable on determining the optimum concentrations of propyl gallate (PG) and citric acid (CA) which resulting a high BDV of NEI oil. Throughout this study, the breakdown voltage test is conducted according to ASTM D1816 with 1mm gap using Megger OTS60PB. The experimental results indicate that by adding PG and CA antioxidants have increases BDV of NEI oils. The optimum concentration of PG and CA antioxidants which gives the highest BDV of NEI oils was 0.05 and 0.25 wt.% respectively. Finally, the regression model is developed by analysis of variance (ANOVA) to estimate the BDV of NEI oils as a function of PG and CA antioxidants.

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