Highly efficient adsorbent for the transformer oil purification by ZnO/Graphene composite

Vu, Thu-Hien; Pham, Van Tuan; Vu, Minh Khoi; Huynh, Dang Chinh; Tran, Ngoc Khiem

doi:10.1016/j.arabjc.2020.09.011

Cited by 12 publications

(6 citation statements)

References 43 publications

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“…According to the calculations results and literature sources analysis [1][2][3][4][9][10][11][12][13][14][15][16][17] we can make a conclusion as to the expediency of using this installation for centrifugal cleaning of transformer oil.…”

Section: Discussionmentioning

confidence: 99%

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Electrical Power Unit of the Transformer Oil Centrifugal Cleaning Unit

Hnatov¹,

Arhun²,

Bagach³

et al. 2021

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Problem. Cleaning transformer oil is one of the important engineering tasks, whose solution is associated with significant material and energy expenditure. Due to the increase in electricity consumption at modern automobile companies (firms, organizations, service stations, etc.), the load on transformer substations increases and the requirements for reliability of electrical and electronic devices become more complicated. This, in turn, leads to the problem of cleaning and recycling of transformer oil. Goal. The goal is the research and development of an efficient unit for centrifugal cleaning of transformer oil with a drive control system that provides automation of the start and braking mode of the drive. Methodology. Analytical methods of research, methods of the theory of electric machines and electric drives are used, as well as the methods of calculating electric circuits. Also, methods of analysis of circuits and control of power electronics devices, principles of operation and methods of control of static converters are used. Results. The structural scheme of the unit for cleaning transformer oil is developed. The calculations of the main elements of the power block of the transformer oil cleaning unit are performed. The block diagram of the voltage converter with frequency f = 50 Hz to alternating voltage with frequency f = 400 Hz is developed. Control circuits of the electric drive of the centrifugal separator are chosen. The analysis of operation of electric drive control circuits is carried out and the principles of their work concerning two components are considered: the regulated rectifier and the inverter. Originality. The scheme of the converter of alternating three-phase current with voltage of 220 V and frequency of 50 Hz, into alternating three-phase current with voltage of 220 V and frequency of 400 Hz is developed. This frequency, in addition to providing the necessary characteristics of the oil separator, allows you to develop a converter device of a relatively small weight and volume, and also provides its high reliability. Practical value. Utilizing the used transformer oil in this way will solve several problems at once. It is possible to reduce the initial production of transformer oil. The issue of waste oil disposal is being resolved leading to the solution of the environmental aspect of this problem. All this will reduce the cost of oil poured into transformers and the operating cost of transformer substations.

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Section: Discussionmentioning

confidence: 99%

“…Currently, several methods are used to purify the waste TO [1][2][3][4][8][9][10][11][12][13][14][15]:…”

Section: Analysis Of Publicationsmentioning

confidence: 99%

Electrical Power Unit of the Transformer Oil Centrifugal Cleaning Unit

Hnatov¹,

Arhun²,

Bagach³

et al. 2021

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“…Photocatalysis uses photocatalyst materials to convert photon energy into chemical energy, and it can be used to clean the environment [1][2][3]. Zinc oxide (ZnO), with a direct and wide band gap of approximately 3.4 eV and a large exciton binding energy of approximately 60 meV, is an efficient and popular photocatalytic material [4][5][6][7][8]. ZnO nanostructures are fabricated through various methods, such as hydrothermal method, sol-gel method, chemical vapor deposition, and thermal evaporation [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the incorporation of rGO into inorganic semiconductor photocatalysts will increase their photocatalytic efficiency [10,16,17,19]. rGO can effectively enhance the photocatalytic properties of materials because of its superior electrochemical properties, high surface area, and suitable pore size distribution [2,7,11,12]. Furthermore, the hexagonal atomic structure of graphene can serve as a platform for the development of other nanostructures such as ZnO [11,12].…”

Section: Introductionmentioning

confidence: 99%

Reduction of graphene oxide (GO) to reduced graphene oxide (rGO) at different hydrothermal temperatures and enhanced photodegradation of zinc oxide/rGO composites

Van Tuan,

Thi Ha,

Hung

et al. 2023

Phys. Scr.

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Scholars are shifting their attention to the development of environmentally friendly materials with a high degradability of environmental pollutants. Among various photocatalytic materials, zinc oxide (ZnO)/reduced graphene oxide (rGO) nanomaterials can meet these requirements. In this study, ZnO/rGO nanomaterials with different hydrothermal temperatures were fabricated through a hydrothermal method. We determined the hydrothermal temperature variations to create different structures and identify the morphologies and sizes of the ZnO/rGO material. The average crystal size of ZnO/rGO nanomaterials decreased from 32.25 nm to 30.30 nm when the hydrothermal temperature was increased from 100 °C to 180 °C. The detailed x-ray diffraction (XRD) study showed that the diffraction peak position of ZnO decreased, the lattice constant increased, and the unit cell volume increased with the increase in hydrothermal temperature. rGO-related diffraction peaks were also observed in the XRD patterns of ZnO/rGO samples, which indicates the formation of a ZnO/rGO crystalline structure. Fourier transform infrared spectra revealed the chemical bonding of ZnO and rGO materials. The photoluminescence (PL) spectra of ZnO/rGO nanocomposites presented two characteristic emission peaks at 383 and 558 nm. The Raman scattering spectra of ZnO/rGO nanomaterials exhibited ZnO-related peaks at 329, 436, and 1123 cm−1 and rGO-related peaks at 1352, 1579, 2706, and 2936 cm−1. The ultraviolet-visible (Vis) absorption spectra of ZnO/rGO nanomaterials manifested the characteristic absorption peaks of ZnO and rGO at 381 and 291 nm, respectively. The photocatalytic properties of ZnO/rGO nanomaterials were studied through the decomposition of methylene blue (MB) under Vis light. The effect of hydrothermal temperature on the properties of ZnO/rGO materials and the photodecomposition mechanism of MB were investigated in detail.

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“…Transformer oil, extra virgin olive oil, clove oil, breakdown voltage, antimicrobial is carried out using varying oil temperatures because the temperature of the oil inside the transformer when working/operating can be different, which can be caused by disturbances, excessive loading, and the temperature conditions outside the transformer [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Addition Clove Oil to Extra Virgin Olive Oil on Microbial Activity for Use as Transformer Oil

Wibowo

Royan

Romadhona

et al. 2021

JSMPM

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Transformer oil is a liquid insulating material that is used as insulator and as a coolant in transformers. In this study, the addition of clove oil to extra virgin olive oil were performed to determine its effect on antibacterial activity and its usefulness in its ability as a transformer oil. The breakdown voltage test on transformer oil is carried out using various oil temperatures (room temperature and 90oC) because the oil temperature inside the transformer when working/operating can be different, which can be caused by disturbances, excessive loading, and temperature conditions outside the transformer. In addition, the presence of contamination caused by chemical interactions with windings and other solid insulation is catalyzed by high operating temperatures. That causes a gradual change in the original chemical properties of the oil and microbial growth that over time makes it ineffective for use. The method used in this research is by mixing 10%, 20%, 30%, 40%, and 50% of clove oil with extra virgin olive oil to determine the change in breakdown voltage and microbial activity. The test results found that, the addition of clove oil has a vital role in inhibiting bacterial growth. The more clove oil added, the better its antimicrobial properties.

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Highly efficient adsorbent for the transformer oil purification by ZnO/Graphene composite

Cited by 12 publications

References 43 publications

Electrical Power Unit of the Transformer Oil Centrifugal Cleaning Unit

Electrical Power Unit of the Transformer Oil Centrifugal Cleaning Unit

Reduction of graphene oxide (GO) to reduced graphene oxide (rGO) at different hydrothermal temperatures and enhanced photodegradation of zinc oxide/rGO composites

Effects of Addition Clove Oil to Extra Virgin Olive Oil on Microbial Activity for Use as Transformer Oil

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