Thermal properties of synthetic ester-based transformer oil during ageing in laboratory conditions

2014 ◽  
Author(s):  
V. Haramija ◽  
D. Vrsaljko ◽  
V. Durina
Keyword(s):  
Thermal Properties ◽  
Transformer Oil ◽  
Synthetic Ester ◽  
Laboratory Conditions

Dielectric and Thermal Properties of Transformer Oil Modified by Semiconductive CdS Quantum Dots

2016 ◽  
Vol 45 (10) ◽  
pp. 4755-4761 ◽  
Author(s):  
Amr M. Abd-Elhady ◽  
Mohamed E. Ibrahim ◽  
T. A. Taha ◽  
Mohamed A. Izzularab
Keyword(s):  
Quantum Dots ◽  
Thermal Properties ◽  
Transformer Oil ◽  
Cds Quantum Dots ◽  
Dielectric And Thermal Properties

scholarly journals Preparation of Three Types of Transformer Oil-Based Nanofluids and Comparative Study on the Effect of Nanoparticle Concentrations on Insulating Property of Transformer Oil

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Qi Wang ◽  
Muhammad Rafiq ◽  
Yuzhen Lv ◽  
Chengrong Li ◽  
Kai Yi
Keyword(s):  
Thermal Properties ◽  
Comparative Study ◽  
Breakdown Voltage ◽  
Breakdown Strength ◽  
Transformer Oil ◽  
Standard Methods ◽  
Maximum Value ◽  
Negative Impulse ◽  
The Difference

Nanofluids have the potential to become the alternatives of conventional transformer oil for their exquisite electrical and thermal properties. Three kinds of nanoparticles with distinct conductivities, namely, nonconductive nanoparticle Al2O3, conductive nanoparticle Fe3O4, and semiconductive nanoparticle TiO2, with different concentrations from 5% to 40% w/v were selected and suspended into transformer oil to develop nanofluids. The lightening impulse breakdown strengths of the oil samples with and without nanoparticles were measured according to IEC standard methods. The positive impulse breakdown strength indicated that breakdown strength is first increased up to the maximum value at certain concentration and then starts decreasing. The results of negative impulse breakdown manifested that the breakdown voltages of nanofluids with different concentrations were less than the breakdown voltage of pure transformer oil. Different effect mechanisms of dielectric and conductive nanoparticles were also used to describe the difference among three prepared nanofluids.

scholarly journals Improving the thermal performance of electrical transformers using hybrid mixture of (transformer oil, nanoparticles, and PCM)

2020 ◽  
Vol 13 (3) ◽  
pp. 175-182
Author(s):  
Mushtaq I. Hasan ◽  
Adnan A. Ugla ◽  
Hassan S. Kadhim
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Volume Concentration ◽  
Transformer Oil ◽  
Paraffin Wax ◽  
Smelting Process ◽  
Distribution Transformer ◽  
Cooling Performance ◽  
Electrical Transformers ◽  
A New Technique

In this paper, an experimental electrical distribution transformer was studied and a new technique was proposed to improve the performance of a new mixed cooling consisting of pure transformer oil, paraffin wax and nanoparticles. The experiment was carried out on a small transformer that was done by taking a model with dimensions (15 * 10 * 10) cm to facilitate calculations. Paraffin wax absorbs the heat generated in the transformer due to the smelting process that can be used to cool electrical appliances. Nanoparticles have good thermal properties and lead to increased oil insulation to thermal improvements in transformer oil with dispersal of solid nanoparticles and their effects on transformer cooling. Three types of solid nanoparticles were used in this experiment (Al2O3, TiO2, and Sic) with a different volume concentration (1%, 3%, and 5%) and 4% paraffin wax as a certified added percentage for each process. The obtained results showed that when mixing paraffin wax and solid nanoparticles with transformer oil, the transformer cooling performance is improved by reducing the temperature. The best selected nanoparticles were found to be Sic and the reason for this is that Sic has a higher thermal conductivity compared to (Al2O3 and TiO2). The proposed hybrid oil reduces the temperature by 10 ° C (in the case of PCM and Sic) and it is possible to improve the cooling performance of electrical transformers.

scholarly journals Electro-Insulating Nanofluids Based on Synthetic Ester and TiO2 or C60 Nanoparticles in Power Transformer

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1953 ◽  
Author(s):  
Zbigniew Nadolny ◽  
Grzegorz Dombek
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Titanium Oxide ◽  
Transfer Factor ◽  
Power Transformer ◽  
Fullerene C60 ◽  
Synthetic Ester ◽  
Heat Transfer Factor ◽  
Factor Α ◽  
The Impact

The article discusses thermal properties of synthetic ester admixed with nanoparticles. The analyzed thermal properties were: thermal conductivity λ, kinematic viscosity υ, density ρ, specific heat cp, and the thermal expansion factor β- all obtained by means of measurements. On the basis of these, the authors calculated the heat transfer factor α, which determines the ability of the liquid to heat transport. The authors used nanoparticles of fullerene C60 and titanium oxide TiO2. The analysis of the thermal properties was done for the temperatures of 25, 40, 60 and 80 °C. The authors analyzed the impact of nanoparticles C60 and TiO2 on thermal properties of synthetic ester. They proved that fullerene C60 in principle had no influence on heat transfer factor α of the ester, while titanium oxide TiO2 had some positive influence on the factor, the value of which increased about 1–3%.

The thermal properties of some amine tetraphenylboron salts8-Quinolinol and its derivatives

1960 ◽  
Vol 23 ◽  
pp. 332-336 ◽  
Author(s):  
W WENDLANDT ◽  
J VANTASSEL ◽  
G ROBERTHORTON
Keyword(s):  
Thermal Properties
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