Properties of Thermally Aged Natural Esters Used as Insulating Liquid

Rajab, Abdul; Tsuchie, Motoo; Kozako, Masahiro; Hikita, Masayuki; Suzuki, Takashi

doi:10.15676/ijeei.2018.10.2.2

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…Results show that the breakdown voltage of PFAE and FR3 were relatively unchanged during the aging process. Nevertheless, the volume resistivity of all aged oils decreased due to their increased acid value during the aging process [11]. Fernández et al studied aged vegetable oil-based nanofluids (ZnO and TiO2), which their age were accelerate by thermal aging at 150 °C.…”

Section: Introductionmentioning

confidence: 99%

Long Term Thermal Performance of Palm Oil and Nano Graphene Filler in Nanofluids Application on Transformer Insulating Oil and Electrical Breakdown Voltage

Wajanasoonthon

Suksri

2022

KEM

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Mineral oil has been used as electrical insulation for a long time due to its availability, excellent cooling and dielectric property. However, petroleum sources are nonrenewable, and it is depleting. Vegetable insulating oil is an alternative since it is renewable, environment-friendly, biodegradable, high fire-point, and has a good electrical breakdown voltage level. These properties can make vegetable insulating oil as a replacement for mineral oil that is going to be limited in availability. Nevertheless, vegetable insulating oil have high viscosity, leading to a slow flow rate on the cooling performance. This research is to investigate the breakdown voltage of palm oil-based liquid insulators. This liquid is palm oil methyl esters-based nanofluids (NPME) that was converted from the transesterification process to reduce viscosity and mixed with graphene nanoparticles. These nanofluids were also aged by thermal aging at 100 °C for 168, 336 and 504 hours before testing for their electrical breakdown voltage. The results show that the transesterification process can reduce the viscosity of palm oil by about 6.6 times. Also, the breakdown voltage of nanofluids is higher than bare palm oil methyl ester after thermal aging for 504 hours.

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Section: Introductionmentioning

confidence: 99%

Long Term Thermal Performance of Palm Oil and Nano Graphene Filler in Nanofluids Application on Transformer Insulating Oil and Electrical Breakdown Voltage

Wajanasoonthon

Suksri

2022

KEM

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Study on static electrification of the PFAE-mineral oil mixture

Rajab

Gumilang²,

Tsuchie

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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The natural ester of tri-ester type has been implemented on a high voltage large power transformer, rated at 420 kV, since 2014. The high voltage transformer is known prone to the static electrification risk. Palm fatty acid ester (PFAE) which is a monoester oil type has also been tried on the high voltage power transformer. For a retrofilling purpose, some portion of the previously used insulating oil (it is mainly mineral oil) will remain in the transformer. It is then demanded to study the static electrification of a mixture of PFAE and mineral oil. This paper presents an investigation results on the static electrification properties of PFAE-mineral oil mixture at various percentage ratios of PFAE. The results show that charging tendency (ECT) increase with the percentage ratio of PFAE, but then decreases for the oil containing only PFAE. On the other side, the resistivity of oil mixtures decreases with the increase of percentage ratio of PFAE but then increases for the oil containing only PFAE.

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