Statistical investigation of AC breakdown voltage of nanofluids compared with mineral and natural ester oil

Peppas, Georgios D.; Charalampakos, Vasilios P.; Pyrgioti, E.; Danikas, M. G.; Bakandritsos, Aristides; Gonos, Ioannis F.

doi:10.1049/iet-smt.2016.0031

Cited by 101 publications

(66 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The role of nanoparticles as electronic scavengers has been also advanced by Peppas et al [31], and Makmud et al [32] to explain the improvement of breakdown voltage. They attributed this improvement to the effective electron scavenging by the nanostructures what results in delaying the development of streamers and reducing their propagation velocity.…”

Section: Discussionmentioning

confidence: 97%

AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids

Khaled¹,

Béroual²

2018

Preprint

View full text Add to dashboard Cite

This paper deals with experimental study of the influence of conductive (Fe3O4) and insulating (Al2O3) nanostructured particles at various concentrations on the dielectric strength of transformer mineral oil. The method of preparation and characterization of these nanofluids (NFs) through the measurements of zeta potential, the real and imaginary parts of dielectric constant as well as the concentration and size of nanoparticles using Scanning Electron Microscope (SEM) images of nanoparticles powders and Dispersive x-ray Spectroscopy (EDS) analysis are presented. Experimental findings reveal that these two types of nanoparticles materials significantly improve AC breakdown voltage and the magnitude of this improvement depends on the concentration, size and nature (material) of nanoparticles. For a given type of nanoparticles, the effect is more marked with the smallest nanoparticles. The conductive nanoparticles offer higher enhancement of dielectric strength compared with insulating nanoparticles based nanofluids. With Fe3O4, the breakdown voltage (BDV) can exceed twice that of mineral oil and it increases by more than 76% with Al2O3. The physicochemical mechanisms implicated in this improvement are discussed.

show abstract

Section: Discussionmentioning

confidence: 97%

AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids

Khaled¹,

Béroual²

2018

Preprint

View full text Add to dashboard Cite

show abstract

“…From Figure 3a, the breakdown voltages of the cone-plan electrodes without bubbles are more than the breakdown voltages of the other two types electrodes, and the breakdown voltages of the sphere-plan electrodes are similar to the cylinder-plan electrodes. Dissado [21] and Peppas [22] indicated that the statistical analyses were suitable for the dielectric breakdown. Based on these, we calculated some statistics of the breakdown voltages.…”

Section: Ac Breakdown Voltages Of the Transformer Oilmentioning

confidence: 99%

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Qin

Shi

et al. 2018

Energies

View full text Add to dashboard Cite

Bubbles will reduce the electric strength of transformer oil, and even result in the breakdown of the insulation. This paper has studied the breakdown voltages of transformer oil and oil-impregnated pressboard under alternating current (AC) and direct current (DC) voltages. In this paper, three types of electrodes were applied: cylinder-plan electrodes, sphere-plan electrodes, and cone-plan electrodes, and the breakdown voltages were measured in both no bubbles and bubbles. The sphere-sphere electrodes were used to study the breakdown voltage of the oil-impregnated pressboard. The results showed that under the influence of bubble, the breakdown voltage of the cylinder-plan electrode dropped the most, and the breakdown voltage of the cone-plan electrode dropped the least. The bubbles motion was the key factor of the breakdown. The discharge types of the oil-impregnated pressboard were different with bubbles, and under DC, the main discharge type was flashover along the oil-impregnated pressboard, while under AC, the main discharge type was breakdown through the oil-impregnated pressboard.

show abstract

“…[77], and its average lightning breakdown voltage is 24% higher than that of the unmodified mineral insulating oil. The performance of the natural ester and nano-Fe 3 O 4 -modified mineral insulating oil was compared [78]. The experimental results showed that the nano-Fe 3 O 4 -modified mineral oil exhibited better performance than a mixture of natural esters and mineral oil from the aspects of dielectric properties and breakdown voltage.…”

Section: Effect Of Nanoparticles On the Breakdown Voltage Of Mineral mentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

View full text Add to dashboard Cite

Abstract:In November 2017, the first ±1100 kV high-voltage direct-current power transformer in the world, which was made by Siemens in Nurnberg, passed its type test. Meanwhile, in early 2017, a ±1000 kV ultra-high voltage (UHV) substation was officially put into operation in Tianjin, China. These examples illustrate that the era of UHV power transmission is coming. With the rapid increase in power transmission voltage, the performance requirements for the insulation of power transformers are getting higher and higher. The traditional mineral oils used inside power transformers as insulating and cooling agents are thus facing a serious challenge to meet these requirements. In this review, the basic properties of traditional mineral insulating oil are first introduced. Then, the variation of electrical properties such as breakdown strength, permittivity, and conductivity during transformer operation and aging is summarized. Next, the modification of mineral insulating oil is investigated with a focus on the influence of nanoparticles on the electrical properties of nano-modified insulating oil. Recent studies on the performance of mineral oil at molecular and atomic levels by molecular dynamics simulations are then described. Finally, future research hotspots and notable research topics are discussed.

show abstract

Statistical investigation of AC breakdown voltage of nanofluids compared with mineral and natural ester oil

Cited by 101 publications

References 59 publications

AC Dielectric Strength of Mineral Oil-Based Fe<sub>3</sub>O<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub> Nanofluids

AC Dielectric Strength of Mineral Oil-Based Fe<sub>3</sub>O<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub> Nanofluids

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

Contact Info

Product

Resources

About