Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer

Mineral insulation oils are generally used for electric power apparatus as insulators and cooling medium. Since mineral oils are not biodegradable, have low flash points and are difficult to decompose, there is a need for the development of vegetable-based insulation oils for such applications. This...

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Main Author:	Mohd.Taib, Mohd. Fikri Hilmi
Format:	Thesis
Published:	2018
Subjects:	TK Electrical engineering Electronics Nuclear engineering
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spelling	my-utm-ep.793882018-10-14T08:45:10Z Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer 2018 Mohd.Taib, Mohd. Fikri Hilmi TK Electrical engineering. Electronics Nuclear engineering Mineral insulation oils are generally used for electric power apparatus as insulators and cooling medium. Since mineral oils are not biodegradable, have low flash points and are difficult to decompose, there is a need for the development of vegetable-based insulation oils for such applications. This study is conducted to investigate the physical, electrical and chemical ageing performances of vegetablebased oils for transformer fluid application against mineral oil. First, the accelerated thermal ageing was carried out on three different types of vegetable-based oils and existing mineral oil at 130˚C under sealed conditions for several period of times (0, 50, 200, 500 and 1,000 hours). The vegetable-based oils were palm-based oils (HiLECT oil and Palm Fatty Acid Ester (PFAE)) and one type of soybean-based oil (Envirotemp® FR3). The effects in terms of visual observation, viscosity, dielectric strength and moisture content were discussed in detail. Sequentially, two units of three phase hermetically sealed distribution transformers (100 kVA, 11 kV/415 V) filled with mineral oil and HiLECT oil were constantly loaded at a high load (72%) at several period of times (0, 500 and 1,000 hours) under laboratory condition. The ageing performance comparisons were done in terms of visual observation, viscosity, dielectric strength, dissipation factor, moisture content, acidity and dissolved gas analysis. The study shows that HiLECT oil is suitable to be used as an alternative transformer insulation oil due to its good dielectric ageing properties compared to mineral oil, PFAE and FR3. In addition, its viscosity is seen as adequate for the transformer’s cooling medium application even though its viscosity is 10 times higher than PFAE and 3.4 times higher than mineral oil. On the other hand, paper immersed in HiLECT oil degrades around 2 times slower than the paper immersed in mineral oil. In conclusion, the comparison revealed that HiLECT oil has better characteristics than mineral oil in prolonging transformer’s lifetime. 2018 Thesis http://eprints.utm.my/id/eprint/79388/ phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Mohd.Taib, Mohd. Fikri Hilmi Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
description	Mineral insulation oils are generally used for electric power apparatus as insulators and cooling medium. Since mineral oils are not biodegradable, have low flash points and are difficult to decompose, there is a need for the development of vegetable-based insulation oils for such applications. This study is conducted to investigate the physical, electrical and chemical ageing performances of vegetablebased oils for transformer fluid application against mineral oil. First, the accelerated thermal ageing was carried out on three different types of vegetable-based oils and existing mineral oil at 130˚C under sealed conditions for several period of times (0, 50, 200, 500 and 1,000 hours). The vegetable-based oils were palm-based oils (HiLECT oil and Palm Fatty Acid Ester (PFAE)) and one type of soybean-based oil (Envirotemp® FR3). The effects in terms of visual observation, viscosity, dielectric strength and moisture content were discussed in detail. Sequentially, two units of three phase hermetically sealed distribution transformers (100 kVA, 11 kV/415 V) filled with mineral oil and HiLECT oil were constantly loaded at a high load (72%) at several period of times (0, 500 and 1,000 hours) under laboratory condition. The ageing performance comparisons were done in terms of visual observation, viscosity, dielectric strength, dissipation factor, moisture content, acidity and dissolved gas analysis. The study shows that HiLECT oil is suitable to be used as an alternative transformer insulation oil due to its good dielectric ageing properties compared to mineral oil, PFAE and FR3. In addition, its viscosity is seen as adequate for the transformer’s cooling medium application even though its viscosity is 10 times higher than PFAE and 3.4 times higher than mineral oil. On the other hand, paper immersed in HiLECT oil degrades around 2 times slower than the paper immersed in mineral oil. In conclusion, the comparison revealed that HiLECT oil has better characteristics than mineral oil in prolonging transformer’s lifetime.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd.Taib, Mohd. Fikri Hilmi
author_facet	Mohd.Taib, Mohd. Fikri Hilmi
author_sort	Mohd.Taib, Mohd. Fikri Hilmi
title	Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
title_short	Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
title_full	Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
title_fullStr	Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
title_full_unstemmed	Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
title_sort	comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2018
_version_	1747818216423424000

Comparative study on dielectric performance between vegetable-based and mineral-based oil under accelerated thermal ageing and loaded distribution transformer

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