Next Generation Insulating Liquids Prepared by the International working Group of IEEE DEIS Technical Committee on Liquid Dielectrics

Rao, U. Mohan; Fofana, I.; Rózga, Paweł; Béroual, Abderrahmane; Malde, J.; Martin, R.; Wang, Feipeng; Casserly, Edward; Pompili, M.; Calcara, Luigi

doi:10.1109/icdl49583.2022.9830984

Cited by 9 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BIO and SE were chosen for the tests as MO alternatives with biodegradable characteristics. SE is a quite well-known biodegradable liquid that has been the subject of much research [7,[11][12][13][14][15]17,29,30]. In turn, studies on BIO are very limited, mainly due to its novel character and very short time of availability in the dielectric liquid market [18,21,31].…”

Section: Methodology Of the Studiesmentioning

confidence: 99%

“…In the case of high electrical stresses inside the transformer tank, air is no longer a sufficient medium to ensure proper insulation of the active parts. In such cases, the best insulating medium to be used in transformers is a dielectric liquid [7,8]. It provides much better insulation than air and ensures adequate cooling of the windings and core.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Kunikowski,

Rozga,

Pasternak

et al. 2024

Energies

View full text Add to dashboard Cite

This study presents findings on the influence of gap length distance on the lightning impulse breakdown voltage of three dielectric liquids of different chemical origins. The liquids were tested in a model electrode system with a quasi-uniform electric field distribution and a pressboard plate placed on the grounded electrode. The experimental studies were supported using calculations and simulations to show the individual relationships between the lightning impulse breakdown voltage and gap distance, which represent the so-called volume effect of the most stressed liquid. The results of the experiment, which involved four considered gap distances of 2, 4, 6, and 8 mm, show that a dynamic increase in lightning impulse breakdown voltage with an increase in gap distance is associated with mineral oil and bio-based hydrocarbons. However, similar trends were not observed for synthetic ester. Calculations that allowed us to assess the impact of gap length distance on lightning impulse breakdown voltage support the observations from the experimental studies. The curves obtained in this field can be considered in the process of designing insulating systems for transformers.

show abstract

Section: Methodology Of the Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Kunikowski,

Rozga,

Pasternak

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Natural esters have competitive advantages over mineralbased transformer oil. They are highly biodegradable and have higher flash and fire points, better moisture absorption, and greater breakdown strength (Rao et al, 2022). However, they have inherent undesired properties such as high viscosity, high loss, and poor thermooxidation stability (Rao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…They are highly biodegradable and have higher flash and fire points, better moisture absorption, and greater breakdown strength (Rao et al, 2022). However, they have inherent undesired properties such as high viscosity, high loss, and poor thermooxidation stability (Rao et al, 2022). Although, unlike in breathers transformers where the liquid insulation is exposed to inflowing air, natural ester oil used in hermetically sealed transformers is safe from thermally induced oxidation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica and Alumina Nanoparticles Addition on the Dielectric and Rheological Properties of Shea Oil Methyl Ester

Aliyu,

Umar,

Abdelmalik

et al. 2024

USci

View full text Add to dashboard Cite

Study’s Excerpt/Novelty This study introduces a novel green nanofluid by incorporating shea methyl ester (SME) with surface-modified Al2O3 and SiO2 nanoparticles, addressing the environmental concerns associated with mineral-based transformer oils. The research highlights that SiO2 nanoparticles significantly enhance the dielectric properties of the base oil while minimally impacting its viscosity, suggesting improved insulation performance. This innovative approach offers a sustainable alternative with superior electrical characteristics, potentially transforming the application of transformer oils in the industry. Full Abstract The increasing environmental and utility concerns of mineral-based transformer oils have impelled research into alternative insulation liquids. This study developed a green nanofluid using a two-step approach, incorporating shea methyl ester (SME) derived from shea butter oil and surface-modified Al2O3 and SiO2 nanoparticles. The dynamic viscosity at 25 °C and dielectric properties of the developed nanofluid were investigated in the frequency range of 0.1–15 kHz. Adding nanoparticles into the SME noticeably increased the oil's viscosity, with SiO2 nanoparticles having the least effect on the base liquid's viscosity. The addition of 0.6 wt% of Al2O3 nanoparticles increased the dielectric loss of the SME at all frequencies (0.1–15 kHz), while the addition of 0.6 wt% SiO2 filler nanoparticles reduced the loss of the base oil at frequencies beyond 4 kHz indicative of an improved electrical property. Adding Al2O3 and SiO2 to the base SME oil obtained higher relative permittivity values. This study successfully developed an SME and single nanoparticle-based nanofluid, incorporating a 0.6 wt% weight fraction of surface-modified Al2O3 and SiO2 nanoparticles. The addition of these nanoparticles increased the dynamic viscosity of the base methyl ester oil, with approximately 43% and 36% increases, respectively. The nanofluid developed by incorporating SiO2 nanoparticles showed promising dielectric performance for its application as an insulation liquid.

show abstract

“…Recently, oilbased nanofluids provided another option for insulating fluids, which proved to have better thermal and dielectric properties. An effort is done in parallel by the IEEE technical committee on liquid dielectrics (TC-LD) focusing to add the nanofluids in the forthcoming IEEE and potentially IEC standards [5]. Various types, morphologies, and concentrations of nanoparticles (NPs) were used to get oil-based nanofluids with enhanced properties [6][7][8][9][10].…”

mentioning

confidence: 99%

Thermal and Dielectric Analysis of an Ester-Based MgO Nanofluid

Emara,

Peppas,

Tsovilis

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Magnesium oxide (MgO) nanoparticles are used for nanofluid preparation in an effort to investigate their dielectric response and thermal properties. The matrix oil for the prepared samples is natural ester oil. Lightning impulse voltage (1.2/50 μs) is used to investigate the electrical performance of the different concentration samples. In addition, broadband dielectric spectroscopy is used for the analysis of the dielectric constant and electrical conductivity through a temperature range of 30 ºC -90 ºC and a frequency spectrum of 0.1 Hz -1MHz. Thermal properties are studied by means of Laser Flash analysis and Differential Scanning Calorimetry. Thermal conductivity is calculated and the understudied results are evaluated. Results reveal an improvement in different properties for the prepared nanofluid samples, including an enhancement by 15.15 % and 12.63 % of the lightning impulse breakdown voltage and the thermal conductivity, respectively.

show abstract

Next Generation Insulating Liquids Prepared by the International working Group of IEEE DEIS Technical Committee on Liquid Dielectrics

Cited by 9 publications

References 9 publications

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Effect of Silica and Alumina Nanoparticles Addition on the Dielectric and Rheological Properties of Shea Oil Methyl Ester

Thermal and Dielectric Analysis of an Ester-Based MgO Nanofluid

Contact Info

Product

Resources

About