Ageing Study of Palm Oil and Coconut Oil in the Presence of Insulation Paper for Transformers Application

Mohamad, Nur Aqilah; Azis, Norhafiz; Jasni, Jasronita; Kadir, Mohd Zainal Abidin Ab; Yunus, Robiah; Yaakub, Zaini

doi:10.3390/ma11040532

Cited by 17 publications

(3 citation statements)

References 49 publications

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“…Highly-refined palm oil (PO) was used as natural ester-based insulating fluid (NE) [ 14 ]. Two different types of nanoparticles—Iron (III) oxide (Fe 3 O 4 ) ≥ 97% and Titanium dioxide (TiO 2 ) ≥ 99.5%—were applied to prepare the samples of natural ester with conductive nanoparticles (CNF) and natural ester with semiconductive nanoparticles (SNF), respectively.…”

Section: Methodsmentioning

confidence: 99%

Partial Discharge in Nanofluid Insulation Material with Conductive and Semiconductive Nanoparticles

et al. 2019

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This study provides a thorough investigation of partial discharge (PD) activities in nanofluid insulation material consisting of different types of nanoparticles, which are conductive and semiconductive when subjected to high voltage stress is presented. Nanofluids have become a topic of interest because they can be an alternative to liquid insulation in electrical apparatus due to their promising dielectric strength and cooling ability. However, during in-service operation, PDs can occur between conductors in the insulation system. Therefore, this study presents the behavior of PDs within nanofluid dielectric materials consisting of conductive and semiconductive nanoparticles. The results show that there is an improvement in the PD resistance and a reduction in the tan delta of nanofluids at power frequency after the incorporation of conductive or semiconductive nanoparticles in the nanofluid oil. However, the most suitable concentration of conductive and semiconductive nanoparticles in the base fluid was found to be, respectively, 0.01 g/L and 1.0 g/L at PD inception and PD steady-state conditions. The clustering of nanoparticles in a nanofluid suspension due to PD activities is also discussed in this study.

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Section: Methodsmentioning

confidence: 99%

Partial Discharge in Nanofluid Insulation Material with Conductive and Semiconductive Nanoparticles

et al. 2019

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“…However, epoxy resins exhibit poor heat dissipation, which significantly shortens the service life of insulating equipment [3,4]. In recent years, higher requirements have been demanded on the electrical and thermal properties of epoxy resins owing to the development of the power industry toward high voltage and large capacities [5,6]. The improvement of the performance of polymer matrix composites using inorganic particles has been thoroughly investigated [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Environmental Temperature on the Insulating Performance of Epoxy/MgO Nanocomposites

Tang

et al. 2020

Applied Sciences

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This article reports on the development of nano-MgO/epoxy resin composites with various mass ratios via a solution blending method. The influence of MgO nanofillers on the thermal properties and the effect of environmental temperature on the insulating properties of the composite material were analyzed. The results show that the thermal conductivity of the composites increased with an increasing MgO nanofiller content. Compared with the pure epoxy resin, the thermal conductivity increased by 75% when the content of MgO nanoparticles was 7%. The volume resistivity first increased and then decreased with an increasing doping concentration. The volume resistivity increased by 26.8% in comparison with the pure epoxy resin when the content of MgO nanoparticles was 1%, while its dielectric constant and dielectric loss increased with temperature. In addition, the dielectric constant increased and the dielectric loss first decreased and then increased with an increasing MgO nanoparticle content. Moreover, the MgO composites changed from a glassy to a rubbery state, and the breakdown strength was significantly reduced with an increased temperature. When the temperature was higher than the glass transition temperature, the breakdown strength decreased by 51.3% compared with the maximum breakdown strength at 20 °C. As the content of MgO nanoparticles increased, the breakdown strength of the composite first increased and then decreased. The highest breakdown strength was achieved when the content of MgO nanoparticles was 1%, which was 11.1% higher than that of the pure epoxy resin. It was concluded that the MgO nanofillers can significantly improve the thermal properties of epoxy composites and their insulation performance at high temperatures.

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“…As a result, electrical equipment utilizing epoxies have relatively short service lives [3,4]. Due to the rapid development of power systems, electrical equipment is becoming increasingly miniaturized, having large capacity and high dielectric strength, resulting in strict requirements for their thermal conductivity and insulating performance [5,6]. Indeed, enhancing the performances of polymer matrix composites by adding inorganic particles has been a popular research topic [7,8].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on the Dielectric Properties and Breakdown Performance of h-BN/Epoxy Composites

et al. 2019

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Epoxy–boron nitride composites are promising insulating materials, and it is highly important to understand their insulating performances at different temperatures with different nano-doping amounts. In this study, we investigated the effects of different mass fractions of epoxy–micron hexagonal boron nitride composites on their thermal conductivity, as well as the effects of temperature and mass fraction on their insulating performances. The results demonstrated that the thermal conductivity of epoxy–micron hexagonal boron nitride composites was superior to that of neat epoxy. The thermal conductivity of epoxy–micron hexagonal boron nitride composites increased with the mass fraction of hexagonal boron nitride, and their dielectric constant and dielectric loss increased with temperature. The dielectric constant of epoxy–micron hexagonal boron nitride composites decreased as the mass fraction of hexagonal boron nitride increased, while their dielectric losses decreased and then increased as the mass fraction of hexagonal boron nitride increased. Due to internal heat accumulation, the alternating current breakdown strength of epoxy–micron hexagonal boron nitride composites increased and then decreased as the mass fraction of hexagonal boron nitride increased. Additionally, as the temperature increased, the composites transitioned from the glassy state to the rubbery or viscous state, and the breakdown strength significantly degraded.

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Ageing Study of Palm Oil and Coconut Oil in the Presence of Insulation Paper for Transformers Application

Cited by 17 publications

References 49 publications

Partial Discharge in Nanofluid Insulation Material with Conductive and Semiconductive Nanoparticles

Partial Discharge in Nanofluid Insulation Material with Conductive and Semiconductive Nanoparticles

Effect of Environmental Temperature on the Insulating Performance of Epoxy/MgO Nanocomposites

Temperature Effects on the Dielectric Properties and Breakdown Performance of h-BN/Epoxy Composites

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