A Fundamental Study Of Oxidation Stability Behaviour On Natural Ester Oil Mixed With Optimum Antioxidants For Power Tranformer Applications

Abu Bakar, Norazhar and Rahim, Nor Hidayah and Sutan Chairul, Imran and Ab Ghani, Sharin and Zainuddin, Hidayat and Mohamad, Noraiham and Hanaffi, Farhan and Muhammad, Nor Asiah and Abdul Aziz, Mohd Azhar (2018) A Fundamental Study Of Oxidation Stability Behaviour On Natural Ester Oil Mixed With Optimum Antioxidants For Power Tranformer Applications. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In power transformer applications,an attempt has been made to replace mineral oil with natural ester insulating (NEI) oil due to environmental issues.However,NEI oil is prone to oxidation due to its poor oxidative stability, which can be improved by adding antioxidants to the oil. Besides,recent studies showed that the use of selected antioxidants can also improves the breakdown voltage (BDV) of the oil.Meanwhile,previous researchers have designed their experiments using the conventional one-factor-at-a-time (OFAT) method that 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 the conventional OFAT method.This method is capable on determining the optimum concentrations of propyl gallate (PG) and citric acid (CA) which resulting on high BDV of NEI oil.The experimental results indicated that adding PG and CA antioxidants have increases BDV of NEI oils.The optimum concentration of PG and CA antioxidants that 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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