Enhancement of the Thermal Performance Characteristics of an  Electrical Power Transformer

Azbar, None Nawras Mohammed; Jaffal, Hayder Mohammad; Freegah, Basim

doi:10.37256/est.132020487

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…The average oil temperature for Design C was recorded as 331 K. I note that design D achieves an average temperature of 327 K. This indicates that cooling is significant compared to the traditional design. This is attributed to two factors: First, the fin design allowed for increased surface area for heat transfer in the upper hottest region of the transformer, which is in line with the recommendations of the researcher Azbar et al, [27]. Second, large ventilation channels that conform to the shape of the fin helps keep the fin base away from the hot transformer body.…”

Section: Resultssupporting

confidence: 68%

“…They also found that mild steel has a good ability to transfer heat through the fins surrounding the transformer body. Azbar et al, [27] conducted 3D numerical modelling to test the effects of transformer shape and fins on the cooling performance of ONAN type electrical power distribution transformer. The results showed that the best heat dissipation performance and a significant 12% reduction in oil temperature compared to the conventional transformer were obtained when using the transformer with a perforated trapezoidal fin, hexagonal shape.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 68%

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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“…Other losses in the coil cause insulation damage and an increase in temperature in the transformer, which results in a decrease in efficiency, performance, and capacity (it is necessary to reduce the maximum load or derating to prevent the overheat) [9]. [10] found that harmonic pollution increases losses, so it is necessary to improve power quality by reducing non-linear loads. As a comparison, THD for linear loads does not experience distortion (THD=4.0 %), while for non-linear loads experiences substantial distortion (THD=26 % for inductive loads and THD 75 % for capacitive loads).…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Analysis of loss on single-phase dry transformers with non-linear load

Khristiana

Soeparman

Wahyudi

et al. 2021

EEJET

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The paper studies power losses in transformers due to non-linear loads. The research aims to analyze the power loss in a single-phase dry transformer under a non-linear load. The research uses an SW43W Power supply type, FlukeView Power Quality Analyzer as a DC or AC power supply on the primary side of the transformer. The non-linear load is connected to the secondary side. The loading test of the dry transformer was carried out at non-linear loads. The load variations used 0 %; 12.5 %; 25 %; 37.5 %; 50 %; 62.5 %; 75 %; 87.5 % and 100 %, as well as variations in the THD value by adjusting the ignition angle (α). The non-linear loads used are Half-Wave Rectifier and Controlled Half-Wave Rectifier with resistive loads with variations in THD values. The results showed that the transformer losses comprised Pno load and Pload. The operation of the transformer with constant input voltage and frequency with THDv<5 % resulted in a constant Pno load value at all load values. The greater the percentage of the load, the higher the load. The increase in THD because of non-linear load will increase the load on the transformer. The value of the derating factor is obtained by connecting the increase in losses (∆PLosses), which is influenced by THD and the increase in temperature T(°C) in dry transformers. When the transformer is loaded with a non-linear load, the derating factor<1. THD and derating factor form a linear relationship, when THD increases, the derating factor value decreases. Linear load on the transformer causes a decrease in its capacity, but if it gets a non-linear load with THD=39.1 %, it can withstand a load of 84.294 %, besides the increase in total harmonic distortion will increase losses and reduce transformer capacity

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“…Simulations demonstrated that these modifications enhance the heat transfer coefficient and the cooling capacity of the radiator. Azbar et al [13] conducted a study. A 3D numerical simulation was conducted to investigate the impact of geometrical and operational parameters on the cooling of three-phase power transmission transformers.…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Optimization of Radiator Configurations in Power Transformer Cooling

Koca,

Senturk,

Akbal

et al. 2024

Designs

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In this research, a numerical approach is created to assess the effective parameters of power transformer thermal management and, as a result, improve their cooling systems. This study analyzes the radiator’s thermal performance across several arrangements and optimizes the dimensions and configurations for varied cooling loads from a techno-economic perspective. The optimization criteria were the radiator’s height (L), fin spacing (D), and number of fins (N). Due to the great complexity of the generated models, the coupled thermo-hydraulic numerical simulations were carried out on a computer cluster. An in-house radiator test facility was constructed for the experiments in order to verify the numerical model. The simulation findings accord well with the empirically obtained values. A total of 76 radiator sets were investigated. Following that, the generated findings were used to perform an optimization analysis. Finally, the response surface method was used to establish an ideal radiator layout for the specified cooling capacity at the lowest possible cost. These findings reveal that the best cooling performance is obtained when the spacing between the fins is 50 mm. Cooling capacity per unit cost rises as radiator size decreases. The cost factor and geometric details were shown to have strong connections.

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Enhancement of the Thermal Performance Characteristics of an Electrical Power Transformer

Cited by 6 publications

References 4 publications

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

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

Analysis of loss on single-phase dry transformers with non-linear load

Techno-Economic Optimization of Radiator Configurations in Power Transformer Cooling

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