SF6 gas-insulated 50-kVA distribution transformer design

Özgönenel, Okan; Thomas, David William; Kurt, Unal

doi:10.3906/elk-1708-28

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Figure 4 gives the theoretical breakdown voltage Ud = f(p,d) for R410A and SF6 over the pressure range in this study. The values for SF6 were obtained from the formula in [33].…”

Section: Theoretical Calculationmentioning

confidence: 99%

“…The ambient temperature is defined according to IEEE C.57.12.00. The physical properties of each part of the GIT are shown in Table 5 [33,34]. Figure 16 shows the temperature distribution inside the tank after 2 h. The value for the hot spot temperature is determined as 72.06 • C for 2D analysis and 76.34 • C for 2D axial symmetry analysis.…”

Section: Thermal Analysis Of 50 Kva Distribution Transformermentioning

confidence: 99%

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An Eco-Friendly Gas Insulated Transformer Design

Guney

Özgönenel

2021

Energies

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Electricity companies around the world are constantly seeking ways to provide electricity more safely and efficiently while reducing the negative impact on the environment. Mineral oils have been the most popular transformer insulation, having excellent electrical insulating properties, but have many problems such as high flammability, significant cleaning problems, and are toxic to fish and wildlife. This paper presents an alternative approach to mineral oil: a transformer design that is clean and provides better performance and environmental benefits. A 50 kVA, 34.5/0.4 kV gas insulated distribution transformer was designed and evaluated using the COMSOL Multiphysics environment. R410A was used as insulation material. R410A is a near-azeotropic mixture of difluoromethane (CH2F2, called R-32) and pentafluoro ethane (C2HF5, called R-125), which is used as a refrigerant in air conditioning applications. It has excellent properties including environmentally friendly, no-ozone depletion, low greenhouse effect, non-explosive and non-flammable, First, the breakdown voltage of the selected gas was determined. The electrostatic and thermal properties of the R410A gas insulated transformer were investigated in the COMSOL environment. The simulation results for the performance of oil and SF6 gas insulated transformers using the same model were compared. The gas-insulated transformer is believed to have equivalent performance and is an environmentally friendly alternative to current oil-based transformers.

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“…Figure 4 gives the theoretical breakdown voltage Ud = f(p,d) for R410A and SF6 over the pressure range in this study. The values for SF6 were obtained from the formula in [33].…”

Section: Theoretical Calculationmentioning

confidence: 99%

Section: Thermal Analysis Of 50 Kva Distribution Transformermentioning

confidence: 99%

An Eco-Friendly Gas Insulated Transformer Design

Guney

Özgönenel

2021

Energies

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“…The thermal conductivity of natural or synthetic oils is greater than that of mineral oils. Özgönenel et al, [11] conducted an investigation using COMSOL to convert the distribution of an oil-insulated transformer to a gasinsulated sulfur hexafluoride transformer. The new design provides safer transformation of security risk sites such as mines, submarines and nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Electrical Power Transformer Fins Design Technology: Numerical Analysis and Experimental Validation

Ali Shokor Golam

2024

ARFMTS

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The study includes numerical analysis and experimental verification on an electrical power distribution transformer (250 kVA, 11 kW, Oil Natural Air Natural). ANSYS Fluent R3 2019 software was used to develop the numerical simulation model. The validity of the numerical model was confirmed by comparing the results of the numerical model and experimental data. The study aims to improve the efficiency and performance of electrical power distribution transformers by proposing a design that reduces the temperature of the transformer while maintaining its traditional size. Numerically, the effect of fin geometry on the temperature and density of transformer oil was studied. Four different fin designs were proposed and compared with the traditional design. According to the results, all proposed designs contributed to improving the cooling performance of the transformer compared to the traditional design. Design A is similar to the traditional transformer design, with the only modification being manipulation of the fin length, and achieves an average oil temperature reduction of 4 K. Design B showed the smallest temperature drop of the four designs, with a 3 K drop. Designs C and D include ventilation channels that match the shape of the fin, providing distinct design differences. The difference between both designs relied on the fact that for design C, the orthogonally of fin plates was retained. On the other hand, in design D, skewing of fin plates was introduced. Design D proved to be the most effective in reducing the average oil temperature, being reduced by 10 K. On the other hand, Design C reduced the average oil temperature by 7 K.

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“…So, this transformer used in wind energy generally has a step-up characteristic. Besides, the transformer can be dry type or oil cooled type [3,4]. With respect to the oil cooled transformer, dry type transformer has the advantages of non-flammability and lighter.…”

Section: Introductionmentioning

confidence: 99%

CAD-based Design of Three Phase Transformer and Comprehensive Analysis for Wind Turbine Using Coupled Electromagnetic Field, Circuit and Thermal Model for 3.8 MVA Power

Çetinceviz

Şehirli

2022

Preprint

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In this study, by using co-simulation technique, dry type transformer is designed for wind turbine with 3.8MVA, 690V/36kV power and voltages. Transformer used in wind turbine needs extra effort on design stage with respect to the transformer used in transmission and distribution systems due to higher inrush currents, resonance overvoltage, higher voltage and load fluctuations, possible high frequency transients causing the damage of insulation of the transformer. Also, variable output because of the variable wind speed is expressed as a common failure of the transformer stated in, although by power converters the problem can be minimized. Furthermore, transformer design and analysis of its effect to the system, cannot be realized through one simulation software. Therefore, another approach using different simulation software at the same time called as co-simulation or multiphysics solution is needed. In this paper, by using, co-simulation technique including ANSYS Maxwell 3D, Simplorer and Mechanical, transformer design and its effect to the system is investigated. After realizing, three-dimensional transformer design, its lumped parameter consisting of inductance matrix, leakage inductances and resistances are determined analytically and by using eddy current solver. Also, its effect on the system is shown by Simplorer in transients. Core losses of the transformer, high and low voltage windings voltages, their harmonic spectrums, under different load conditions including ohmic and inductive loads defined and also, steady state thermal solution performed and conclusions are made. It is proved that the transformer designed works as it desired.

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SF6 gas-insulated 50-kVA distribution transformer design

Cited by 9 publications

References 13 publications

An Eco-Friendly Gas Insulated Transformer Design

An Eco-Friendly Gas Insulated Transformer Design

Evaluation of the Electrical Power Transformer Fins Design Technology: Numerical Analysis and Experimental Validation

CAD-based Design of Three Phase Transformer and Comprehensive Analysis for Wind Turbine Using Coupled Electromagnetic Field, Circuit and Thermal Model for 3.8 MVA Power

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