An Investigation on Stability, Electrical and Thermal Characteristics of Transformer Insulting Oil Nanofluids

Asefi, M.; Molavi, Hoda; Niassar, M. Shariaty; Darband, J. Babaee; Nemati, Nasrin; Yavari, M.; Akbari, Mahdokht

doi:10.5829/idosi.ije.2016.29.10a.02

Cited by 6 publications

(3 citation statements)

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“…mixed convection heat transfer from Al2O3-water nanofluid in W-shaped, copper tube cause the rate of heat transfer coefficient improved with Reynolds number for average wall temperatures of 50 and 60ºC. Magneto hydrodynamic nanofluid flow between two parallel analyzed and results showed concentration of nanofluid diminishes when Brownian movement increments whereas it increases with expands of thermophoretic parameter [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Gupta et al [21] examined magneto convection in a nanofluid.…”

Section: Introductionmentioning

confidence: 97%

The application of analytical methods in the investigation effects of Magnetic parameter and Brownian motion on the fluid flow between two equal plates

Pasha

Nabi

Peiravi

et al. 2021

IJE

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Section: Introductionmentioning

confidence: 97%

The application of analytical methods in the investigation effects of Magnetic parameter and Brownian motion on the fluid flow between two equal plates

Pasha

Nabi

Peiravi

et al. 2021

IJE

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“…The two inhibiting factors for maximum power transfer and reducing the size of the transformer are the thermal and insulating properties of the oil [12]. The thermal conductivity of the oil in the transformer is usually not high, which weakens its cooling performance and ultimately reduces the life of the transformer [13,14]. In addition, transformer operation and the aging of the oil, the breakdown voltage (BDV) is significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Physical Mechanism Investigation of Al2O3 Effect on New and Aged Transformer Oil Properties

Mashhadzadeh

Seyyedbarzegar

Samani

2023

IJE

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Al2O3 nanoparticles were used to improve the performance of the vital properties of transformer oil (TO) under normal operating conditions and when subjected to thermal aging. Different weight percentages of Al2O3 in the TO were considered to maximize the breakdown voltage (BDV). Al2O3 nanofluid (NF) increases the BDV by 116% (31.1 kV to 67.4 kV) and the heat transfer by 33.4%, and also minimizes partial discharge (PD) by 66%. The reduction of PD is also related to the ability of Al2O3 to adsorb hydrogen and acetylene, two oil-soluble gases that are effective in PD. Even Al2O3NF was more resistant to water content in TO. BDV for TO and Al2O3NF, when water content increased to more than 30 ppm, were reduced by 57% and 19%, respectively. According to Arrhenius equation, both samples were placed at 120°C for 29 days to age samples (equivalent to about 30 years). Aged Al2O3NF has continued its exceptional performance and improved BDV by 121% compared to aged TO, and also Al2O3NF showed its capacity well and improved PD compared to aged TO by 71%. All the favorable properties of Al2O3NF are conditional on the stability of Al2O3. FESEM confirms the stability of Al2O3.

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“…Nowadays, transformers are employed in different applications and a transformer designer encounters several electromagnetic and insulating complex problems [1][2]. The growing trend in the use of traction systems has increased the need for different structures of multi-winding transformers.…”

Section: Introductionmentioning

confidence: 99%

Multi-Conductor Transmission Line Model of Split-Winding Transformer for Frequency Response and Disk-to-Disk Fault Analysis

Sobouti

Azizian

Bigdeli

et al. 2021

IJE

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For transformer designers, split-winding transformer modeling in different frequency ranges is of great importance. In this paper, for the first time, a multi-conductor transmission line model is proposed for high-frequency modeling of the split-winding transformer. In this model, all the turns in layers and disks have been considered and the model's parameters have been calculated using the finite element method. In order to validate the proposed model, the results are compared with the result of a model, which is based on finite element and coupled field-circuit. It is shown that the introduced model has good accuracy and it can be employed for split-winding transformer modeling in different frequency ranges. In addition, using the validated multi-conductor transmission line model, the frequency response of the split-winding transformer and disk-to-disk short circuit fault are analyzed.

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An Investigation on Stability, Electrical and Thermal Characteristics of Transformer Insulting Oil Nanofluids

Cited by 6 publications

References 0 publications

The application of analytical methods in the investigation effects of Magnetic parameter and Brownian motion on the fluid flow between two equal plates

The application of analytical methods in the investigation effects of Magnetic parameter and Brownian motion on the fluid flow between two equal plates

Experimental Analysis and Physical Mechanism Investigation of Al2O3 Effect on New and Aged Transformer Oil Properties

Multi-Conductor Transmission Line Model of Split-Winding Transformer for Frequency Response and Disk-to-Disk Fault Analysis

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