The effect of magnetite, graphene oxide and silicone oxide nanoparticles on dielectric withstand characteristics of mineral oil

Cavallini, A.; Rajendran, Karthik; Negri, Fabrizio

doi:10.1109/tdei.2015.005016

Cited by 86 publications

(49 citation statements)

References 25 publications

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“…In addition to nano-TiO2, the improvement of the dielectric properties of mineral insulating oil induced by adding nano-SiO2 has been investigated [81]. For these nanofluids, the dielectric withstand properties in a quasi-uniform field were enhanced when the nano-SiO2 concentration was kept at about 0.2 g/L.…”

Section: Effect Of Nanoparticles On the Dielectric Properties Of Minementioning

confidence: 99%

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

et al. 2018

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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.

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Section: Effect Of Nanoparticles On the Dielectric Properties Of Minementioning

confidence: 99%

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

et al. 2018

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“…Recently, nanodielectrics impressed the scientific community by providing a new path for the researchers to develop a new insulating fluid for the power society for optimized function of power transformers . Based on the size and temperature of nanoparticles, the performance can be evaluated.…”

Section: Materials and Methodologymentioning

confidence: 99%

“…However, in realistic insulation systems, the angle is less than 90° due to losses caused by conduction and polarization current. The complement of angle between voltage and current vectors is called dielectric loss of angle δ or dielectric loss angle . Based on the standard ASTM D924, the test cell is heated and maintained up to 90°C .…”

Section: Methodsmentioning

confidence: 99%

“…The complement of angle between voltage and current vectors is called dielectric loss of angle δ or dielectric loss angle. 8,17,21,25 Based on the standard ASTM D924, the test cell is heated and maintained up to 90°C. 6 Based on ASTM D1169 standard, measurement of resistivity and dielectric permittivity is performed at 27°C and 90°C by using automatic ELTEL that makes resistivity meter.…”

Section: Measurement Of Direct Current Resistivity and Complex Permmentioning

confidence: 99%

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Retreatment of aged mineral oil using semiconductive nanocomposites for power transformer application

Thirugnanam

Siluvairaj

Rajendran³

2017

Int Trans Electr Energ Syst

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Summary Power transformer plays a vital role in power system network, and it mainly consists of liquid and solid insulations. In this mineral oil plays a major insulation role and cooling purpose. Moisture and prolonged electric stress leads the way for ageing in transformer insulation. It results in degradation of insulation properties and hindrance in uninterrupted operation. Due to thermal degradation, insulation loosens its dielectric withstand properties. To avoid this, periodic condition monitoring is required to protect the transformer insulation. In this work, an effort has been taken to investigate the aged mineral oil using semiconductive nanocomposites by retreatment technique. The nanocomposites are added with the aged oil in different volume fractions to evaluate the enhancement level of aged oil for reutilization purpose. The critical properties like breakdown voltage, dielectric loss, resistivity, dielectric permittivity, viscosity, flash point, and acidity of the samples before and after treatment are measured according to American Society for Testing and Materials (ASTM) and International Electro‐technical Commission (IEC) standards. It is found that semiconductive nanocomposites improve the critical properties of aged oil and suitable proportion of volume fractions shows impressively enhanced results than base fluid samples. The result paves a new way in economic retreatment of aged oil under environmental friendly nature for reutilization purpose.

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“…These dielectric properties and other such as dissipation factor, dielectric constant or electrical resistivity have been studied by many authors [58,59], analysing the effect of different nanoparticles (CaCu 3 Ti 4 O 12 , TiO 2 , Al 2 O 3 ). The streamers in transformer oils under lightning impulse voltage have been observed, too by authors such as et al [60,61], Cavallini et al [62], Sima et al [63] and Liu et al [64] or simulated as Velasco et al [65]. The last ones not only evaluated dielectric properties, but also thermal conductivity of nanofluids obtained through the dispersion of AlN nanoparticles.…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 97%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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The effect of magnetite, graphene oxide and silicone oxide nanoparticles on dielectric withstand characteristics of mineral oil

Cited by 86 publications

References 25 publications

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

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

Retreatment of aged mineral oil using semiconductive nanocomposites for power transformer application

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

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