Estimation of no-Load Losses in Distribution Transformer Design Finite Element Analysis Techniques in Transformer Design

Nnachi, G. U.; Akumu, A. O.; Richards, Coneth Graham; Nicolae, D.V.

doi:10.1109/powerafrica.2018.8521142

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…(26), the winding Eddy loss for a transformer operating under harmonic current can be expressed as shown in Eq. (27).…”

Section: = (23)mentioning

confidence: 99%

“…The computation of the HLF for other stray loss in this work is similar to that of the winding Eddy loss as shown in Eq. (27), however these losses generated by metallic components such as tank walls, core clamp, windings, core, flitch plate et cetera are proportional to the square of the harmonic load current and the harmonic order to the exponent 0.8 as stated in [37]. The peak local load loss ratio for the HLC is computed as follows: Given that the mean winding Eddy loss at the highest loss ratio under rated conditions is 15% of the Copper losses, then the load loss will be 1.15 p.u as shown below.…”

Section: Computation Of Winding Eddy Loss Under Harmonic Current Loadingmentioning

confidence: 99%

“…In the book Transformer Engineering: Design and Practice [24], the authors described these methods and how they can be embedded into manufacturers internal design programs to compute the Eddy currents. Design programs based on the Finite element Method to compute the Eddy currents are witnessed in the publications [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Approach for Evaluating Eddy Current Loss in Wind Turbine Generator Step-Up Transformers

Thango¹,

Jordaan²,

Nnachi³

2021

Adv. sci. technol. eng. syst. j.

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South Africa is aiming to achieve a generation capacity of about 11.4GW through wind energy systems, which will contribute nearly 15.1% of the country's energy mix by 2030. Wind energy is one of the principal renewable energy determinations by the South African government, owing to affluent heavy winds in vast and remote coastal areas. In the design of newfangled Wind Turbine Generator Step-Up (WTGSU) transformers, all feasible measures are now being made to drive the optimal use of active components with the purpose to raise frugality and to lighten the weight of these transformers. This undertaking is allied with numerous challenges and one of them, which is particularly theoretical, is delineated by the Eddy currents. Many times the transformer manufacturer and also the buyer will be inclined to come to terms with some shortcomings triggered by Eddy currents. Still and all, it is critical to understand where Eddy currents emanate and the amount of losses and wherefore the temperature rise that may be produced in various active part components of WTGSU transformers. This is the most ideal choice to inhibit potential failure of WTGSU transformers arising from excessive heating especially under distorted harmonic load conditions. In the current work, an extension of the author's previous work, new analytical formulae for the Eddy loss computation in WTGSU transformer winding conductors have been explicitly derived, with appropriate contemplation of the fundamental and harmonic load current. These formulae allow the distribution of the skin effect and computation of the winding Eddy losses as a result of individual harmonics in the winding conductors. These results can be utilized to enhance the design of WTGSU transformers and consequently minimize the generation of hotspots in metallic structures.

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“…(26), the winding Eddy loss for a transformer operating under harmonic current can be expressed as shown in Eq. (27).…”

Section: = (23)mentioning

confidence: 99%

Section: Computation Of Winding Eddy Loss Under Harmonic Current Loadingmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Approach for Evaluating Eddy Current Loss in Wind Turbine Generator Step-Up Transformers

Thango¹,

Jordaan²,

Nnachi³

2021

Adv. sci. technol. eng. syst. j.

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“…e research work in [5] classified the losses of transformers into three groups of losses, which are tank losses, core joints losses, and stray losses. e determination of the no-load losses magnitude by using finite element analysis was presented in [6]. e authors of [7] proposed a mathematical model to determine the uncertainty of the transformer on-load and no-load losses.…”

Section: Introductionmentioning

confidence: 99%

Optimized Economic Loading of Distribution Transformers Using Minimum Energy Loss Computing

Agha

Attar

Luhach

2021

Mathematical Problems in Engineering

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This paper presents an approach to achieve the Economic Loading of Distribution Transformer (ELDT) based on minimizing the active energy loss. The effects of the transformer on-load and no-load losses, load factor (LF), and load loss factor (LSF) on the total energy losses are considered. The adopted technique in this paper consists of two phases, where ELDT is determined analytically in the first phase, and the load profile adequated (LSF) is statistically obtained in the second one. The results declare that the proposed technique is suitable for the shifts system mode of operation such as in industrial plants. Moreover, this paper investigates the effect of the total active and reactive power and energy losses on ELDT. Finally, numerical examples with software analyses are performed as a valuable tool, which supports the decision-makers to decide trustfully the size of the transformer and its capacity (kVA) during the design stage, as well as to determine the economic loading during the operation based on the effective factors, that is, total power, energy losses, and the load profile.

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“…In our proposed methodology, we are focusing on the losses occurring in the core which have to be minimized for improving three phase core type transformers. The reason is that while designing transformers main consideration should be focused on core losses as it comprises 70% of total losses in the transformer [15]. In this paper for the designing and comparison, purpose ANSYS electronics desktop software has been used.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

Urooj

Singh

Amir

et al. 2020

EJECE

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Due to indulge behavior of core materials and losses that leads to degradation of transformer efficiency. This research paper evaluating the optimal performance of transformer with designing of a newly core material namely as Mo.Me6. A possibility of increment in the efficiency for designed proposed model of transformer is observable. Also, a comparative analytical study based on the different designs of core type transformer with various core materials. The design and evaluation are performed on the Maxwell ANSYS electronic desktop platform, which provides an optimized design of transformer for practical applications. Whether it is a power transformer having lower frequency applications use in electronic circuits such as rectifying circuits or higher frequency applications power distribution circuit, etc. All transformer designs require performance evaluation in the working field and better efficiency to optimize the overall three-phase type core transformer. In this paper, proposed Mo.Me6 material with improved physical properties have been present of transformer efficiency and optimal design of core. The criteria include the changes in some effective parameters of the core, bringing out advancement in the working efficiency of the transformer. There is an opportunity to have a choice of desired material as designed particularly for the customer need making it will be more reliable and more suitable for various changeable conditions. For more efficient and effective working of transformer, this paper suggests core design with ANSYS techniques to achieve mentioned high efficiency with lower losses.

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Estimation of no-Load Losses in Distribution Transformer Design Finite Element Analysis Techniques in Transformer Design

Cited by 8 publications

References 11 publications

A Novel Approach for Evaluating Eddy Current Loss in Wind Turbine Generator Step-Up Transformers

A Novel Approach for Evaluating Eddy Current Loss in Wind Turbine Generator Step-Up Transformers

Optimized Economic Loading of Distribution Transformers Using Minimum Energy Loss Computing

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

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