Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach
Recently, natural ester insulation (NEI) oils are found to be the best candidates to replace mineral-based insulation oils for oil-immersed transformer applications. However, NEI oilsare prone to oxidation due to their poor oxidative stability which can be improved by adding antioxidants into the oi...
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Institute of Advanced Engineering and Science
2017
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my.utm.770982018-04-30T14:39:45Z http://eprints.utm.my/id/eprint/77098/ Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach Ghani, S. A. Noorden, Z. A. Muhamad, N. A. Zainuddin, H. Abdullah, M. I. H. C. Chairul, I.S. TK Electrical engineering. Electronics Nuclear engineering Recently, natural ester insulation (NEI) oils are found to be the best candidates to replace mineral-based insulation oils for oil-immersed transformer applications. However, NEI oilsare prone to oxidation due to their poor oxidative stability which can be improved by adding antioxidants into the oils. Latest studies have also shown that the use of selected antioxidants improves the AC breakdown voltage (BdV) of NEI oils. However, the experiments in previous studies were designed using the conventional one-factor-at-a-time (OFAT) method, which requires a large number of samples to be tested in order to determine the optimum response. Thus, a Taguchi-based designed experiment is introduced in this study in replacement of the OFAT method. It is found that this method is capable of determining the optimum concentrations of propyl gallate (PG) and citric acid (CA) which will maximize the AC BdV and improve the oxidative stability of the NEI oil. An AC breakdown voltage test is conducted in accordance with the ASTM D1816 standard using Megger OTS60PB portable oil tester, in which the electrode gap distance is kept fixed at 1 mm. The results indicate that the addition of PG and CA antioxidants increases theAC BdV of the rapeseed-based NEI oil. It is found that the optimum concentrations of PG and CA antioxidant is 0.05 and 0.25 wt.%, respectively. Lastly, the model developed in this study is analysed using analysis of variance (ANOVA). Validation test is also conducted on the optimized NEI oil to determine its dielectric strength and oxidative stability. Institute of Advanced Engineering and Science 2017 Article PeerReviewed Ghani, S. A. and Noorden, Z. A. and Muhamad, N. A. and Zainuddin, H. and Abdullah, M. I. H. C. and Chairul, I.S. (2017) Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach. International Journal of Electrical and Computer Engineering, 7 (2). pp. 650-658. ISSN 2088-8708 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020938879&doi=10.11591%2fijece.v7i2.pp650-658&partnerID=40&md5=ed4f6093dc0466cf80e8a1ad306a3b93 DOI:10.11591/ijece.v7i2.pp650-658 |
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TK Electrical engineering. Electronics Nuclear engineering Ghani, S. A. Noorden, Z. A. Muhamad, N. A. Zainuddin, H. Abdullah, M. I. H. C. Chairul, I.S. Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| description |
Recently, natural ester insulation (NEI) oils are found to be the best candidates to replace mineral-based insulation oils for oil-immersed transformer applications. However, NEI oilsare prone to oxidation due to their poor oxidative stability which can be improved by adding antioxidants into the oils. Latest studies have also shown that the use of selected antioxidants improves the AC breakdown voltage (BdV) of NEI oils. However, the experiments in previous studies were designed using the conventional one-factor-at-a-time (OFAT) method, which requires a large number of samples to be tested in order to determine the optimum response. Thus, a Taguchi-based designed experiment is introduced in this study in replacement of the OFAT method. It is found that this method is capable of determining the optimum concentrations of propyl gallate (PG) and citric acid (CA) which will maximize the AC BdV and improve the oxidative stability of the NEI oil. An AC breakdown voltage test is conducted in accordance with the ASTM D1816 standard using Megger OTS60PB portable oil tester, in which the electrode gap distance is kept fixed at 1 mm. The results indicate that the addition of PG and CA antioxidants increases theAC BdV of the rapeseed-based NEI oil. It is found that the optimum concentrations of PG and CA antioxidant is 0.05 and 0.25 wt.%, respectively. Lastly, the model developed in this study is analysed using analysis of variance (ANOVA). Validation test is also conducted on the optimized NEI oil to determine its dielectric strength and oxidative stability. |
| format |
Article |
| author |
Ghani, S. A. Noorden, Z. A. Muhamad, N. A. Zainuddin, H. Abdullah, M. I. H. C. Chairul, I.S. |
| author_facet |
Ghani, S. A. Noorden, Z. A. Muhamad, N. A. Zainuddin, H. Abdullah, M. I. H. C. Chairul, I.S. |
| author_sort |
Ghani, S. A. |
| title |
Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| title_short |
Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| title_full |
Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| title_fullStr |
Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| title_full_unstemmed |
Dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| title_sort |
dielectric strength improvement of natural ester insulation oil via mixed antioxidants: taguchi approach |
| publisher |
Institute of Advanced Engineering and Science |
| publishDate |
2017 |
| url |
http://eprints.utm.my/id/eprint/77098/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020938879&doi=10.11591%2fijece.v7i2.pp650-658&partnerID=40&md5=ed4f6093dc0466cf80e8a1ad306a3b93 |
| _version_ |
1643657497749225472 |
| score |
13.251813 |