Investigation on flow electrification of ester-based TiO<sub>2</sub>nanofluids

Amalanathan, A. J.; Sarathi, R.; Harid, Noureddine; Griffiths, Huw

doi:10.1109/tdei.2020.008540

Cited by 38 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lower dielectric constant at higher temperatures could be due to the weaker interaction between molecules, as well as a fall in the fluid's viscosity. At higher temperatures, the increase in kinetic energy causes Brownian motion of nanoparticles, which results in a reduction in dipole orientation and a decrease in permittivity [16]. The bulk polarizability of the nanoparticles in the base fluid determines the dielectric constant where the permittivity of samples B and C decreases slightly when the temperature rises, which could be due to the interfacial zone between the base fluid and nanoparticles.…”

Section: Dielectric Response Spectroscopymentioning

confidence: 99%

“…Fluorescent fiber detection methods are becoming increasingly popular and their properties for detecting PD activity have to be clearly understood. Another major phenomenon that occurs in large power transformers is static electrification, which occurs when the circulating oils used for heat dissipation from the windings induce surface charge accumulation on the solid insulation, and can lead to complete flashover of pressboard spacers over a longer period of time [16]. Hence, it is required to understand the streaming phenomenon of nanofluids at the pressboard interfaces as not much data is available in the literature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

et al. 2022

Self Cite

View full text Add to dashboard Cite

This study reports experimental investigations of the effects of different surfactants (CTAB, Oleic acid and Span 80) on silica based synthetic ester nanofluids. The positive and negative potential observed for the ionic (CTAB) and non-ionic surfactant (Span 80) from zeta potential analysis indicates an improved stability. The optimization of nanofillers and surfactants is performed considering the corona inception voltage measured using ultra high frequency (UHF) technique and fluorescent fiber. Rheological analysis shows no significant variation of properties with shear rate, implying Newtonian behavior even with the addition of surfactant. In addition, the permittivity of the nanofluid is not much affected by adding surfactant but a marginal variation is noticed in the loss tangent with the effect of temperature. The fluorescence spectroscopy shows no change in the emission wavelength with the addition of silica nanofiller and surfactants. Flow electrification studies indicate an increase in the streaming current with the rotation speed and temperature, with a higher current magnitude observed in the case of nanofluids.

show abstract

Section: Dielectric Response Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…On comparing these results with the conventional mineral oil, the charging tendency of mineral oil is very low due to inherent aromatic suppressants [33]. Also, these higher charging current observed in punga oil could be reduced by adding optimum amount of benzotriazole (BTA) additive which has been illustrated in our previous studies [40]. Thus, the convection of charges around the electrical double layer of the fluid/pressboard interface elucidates the electrostatic charging tendency of punga oil.…”

Section: E Electrostatic Charging Tendency (Ect) Of Punga Oilmentioning

confidence: 52%

“…With increase in the temperature, the rise in the current observed at 90°C is around six times higher than that measured at ambient temperature (30°C). The increase in the charge density and ionic mobility of fluid at higher temperatures could be responsible for the increase in the streaming current [40]. On comparing these results with the conventional mineral oil, the charging tendency of mineral oil is very low due to inherent aromatic suppressants [33].…”

Section: E Electrostatic Charging Tendency (Ect) Of Punga Oilmentioning

confidence: 92%

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Murugesan¹,

Amalanathan

Sarathi

et al. 2021

IEEE Access

Self Cite

View full text Add to dashboard Cite

This paper reports the experimental investigation of the corona discharge activity of punga oil under the influence of a local magnetic field and different voltage profiles (AC and DC voltages) using fluorescent fiber sensor as well as UHF sensor technique. The corona inception voltage (CIV) of punga oil is higher under negative DC voltage followed by positive DC and AC voltage, with a marginal reduction in its CIV magnitude observed on the impact of external magnetic field. The dominant frequency of the UHF signal obtained under AC voltage shifted towards lower frequency (0.6 GHz) with the influence of magnetic flux density to about 85 mT. The rise time, pulse width and energy content of the fluorescent signal formed due to corona activity under AC voltage is found to vary under high magnetic fields confirming the inception results. The fluorescent signals formed due to corona discharge under both AC and DC voltages has its dominant frequency at 1 MHz with no shift observed in the presence of magnetic field. Also, there is no variation in the phase resolved partial discharge (PRPD) pattern observed due to corona discharge (with and without magnetic field) signal using both UHF sensor and the fluorescent sensor. The fluorescent fiber-based technique provides a better accuracy on detecting the corona discharges in punga oil at an early stage compared to conventional UHF sensor. The breakdown voltage of punga oil under different voltage profiles with and without the effect of magnetic field follows normal distribution. The dielectric dissipation factor and electrostatic charging tendency (ECT) of punga oil is observed to be higher than the limit set for insulating fluids towards power transformer operation.INDEX TERMS corona discharge, magnetic field, fluorescent fiber, UHF sensor, rise time, streaming current.

show abstract

“…Amalanathan et al [119] examined MIDEL 1215 mixed with CTAB surfactant and TiO 2 nanoparticles with a size of 5 nm. Significant results of stability proved by Zeta potential showed values above 60 mV at all examined concentrations (25-100 mg/L) and with CTAB the values did not fall under 80 mV.…”

Section: Other Thermophysical Propertiesmentioning

confidence: 99%

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

2021

View full text Add to dashboard Cite

This review is focused on the research of dielectric fluids, especially commonly used power transformer oils enhanced by nanoparticles, i.e., nanofluids. There are differences between various combinations of base fluids and nanoparticles prepared in different ways. The main goal of this review was to present recent research in this field sorted by the used nanoparticles. Nanofluids based on mineral oils, natural, or synthetic esters were investigated in terms of the nature of nanoparticles, particularly Al2O3, TiO2, Fe2O3, Fe3O4, graphene, fullerene, and others. The combinations of environmentally friendly oils and nanoparticles were presented. Finally, the article focused on the description of current dielectric fluids usable in power transformers and the possibilities of improving new and existing fluids with nanoparticles, especially their physical, dielectric, and chemical properties, but with regard to environmental aspects.

show abstract

Investigation on flow electrification of ester-based TiO₂nanofluids

Cited by 38 publications

References 22 publications

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

Contact Info

Product

Resources

About

Investigation on flow electrification of ester-based TiO2nanofluids

Cited by 38 publications

References 22 publications

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

Contact Info

Product

Resources

About

Investigation on flow electrification of ester-based TiO₂nanofluids