Circulating-current loss in transformer windings

Koppikar, D.A.; Kulkarni, Shubham; Ghosh, Gargi; Ainapure, S.M.; Bhavsar, Jagrut

doi:10.1049/ip-smt:19982030

Cited by 16 publications

(6 citation statements)

References 4 publications

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“…𝐼 [102] 𝜙 = 𝐼 [1] 𝑐𝑙 , 𝐼 [103] 𝜙 = 𝐼 [1] 𝑐𝑙 , … , 𝐼 [277] 𝜙 = 𝐼 [1] 𝑐𝑙 𝐼 [278] 𝜙 = 𝐼 [2] 𝑐𝑙 , 𝐼 [279] 𝜙 = 𝐼 [2] 𝑐𝑙 , … , 𝐼 [453] 𝜙 = 𝐼 [2] 𝑐𝑙 𝐼 [454] 𝜙 = 𝐼 [3] 𝑐𝑙 , 𝐼 [455] 𝜙 = 𝐼 [3] 𝑐𝑙 , … , 𝐼 [629] 𝜙 = 𝐼 [3] 𝑐𝑙 𝐼 [630] 𝜙 = 𝐼 [4] 𝑐𝑙 , 𝐼 [631] 𝜙 = 𝐼 [4] 𝑐𝑙 , … , 𝐼 [805] 𝜙 = 𝐼 [4] 𝑐𝑙 𝐼 [806] 𝜙 = 𝐼 [5] 𝑐𝑙 , 𝐼 [807] 𝜙 = 𝐼 [5] 𝑐𝑙 , … , 𝐼 [981] 𝜙 = 𝐼 [5] 𝑐𝑙 𝐼 [982] 𝜙 = 𝐼 [6] 𝑐𝑙 , 𝐼 [983] 𝜙 = 𝐼 [6] 𝑐𝑙 , … , 𝐼 [1157] 𝜙 = 𝐼 [6] 𝑐𝑙 .…”

Section: Equations Of Electrical Connections Between Conductorsunclassified

“…On the other hand, the equations of the coil voltages of the LV winding can be presented as follows 𝑉 [102] 𝑑𝑝 + 𝑉 [103] 𝑑𝑝 + ⋯ + 𝑉 [277] 𝑑𝑝 = 𝑉 [1] 𝑐𝑙 𝑉 [278] 𝑑𝑝 + 𝑉 [279] 𝑑𝑝 + ⋯ + 𝑉 [453] 𝑑𝑝 = 𝑉 [2] 𝑐𝑙 𝑉 [454] 𝑑𝑝 + 𝑉 [455] 𝑑𝑝 + ⋯ + 𝑉 [629] 𝑑𝑝 = 𝑉 [3] 𝑐𝑙 𝑉 [630] 𝑑𝑝 + 𝑉 [631] 𝑑𝑝 + ⋯ + 𝑉 [805] 𝑑𝑝 = 𝑉 [4] 𝑐𝑙 𝑉 [806] 𝑑𝑝 + 𝑉 [807] 𝑑𝑝 + ⋯ + 𝑉 [981] 𝑑𝑝 = 𝑉 [5] 𝑐𝑙 𝑉 [982] 𝑑𝑝 + 𝑉 [983] 𝑑𝑝 + ⋯ + 𝑉 [1157] 𝑑𝑝 = 𝑉 [6] 𝑐𝑙 .…”

Section: Equations Of Electrical Connections Between Conductorsmentioning

confidence: 99%

“…Although the use of parallel conductor arrangements is an effective technique to keep the ohmic and eddy losses under control, there exist the disadvantage that each conductor belonging to a given turn is under the influence of different magnetic field values. This effect leads to the fact that induced voltages in the conductors of the same turn are not necessarily the same, giving rise to circulating currents between them [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Semianalytic integral method for the fast solution of circulating currents in power transformers

Díaz

Mombello

Marulanda

2018

International Journal of Applied Electromagnetics and Mechanics

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Power transformer design normally includes an optimization process which involves the assessment of a great number of design alternatives. This calculation process normally requires a high computation time and its reduction is always a desirable goal. Circulating currents in parallel connected conductors in transformer windings are a critical design aspect to be analyzed. This article presents a new methodology for the fast calculation of circulating currents for parallel connected conductors in power transformers. The formulation for solid conductor modeling has been developed using the same calculation strategy as in Semianalytic Integral Method (SAIM) [1], which allows a significant reduction of computational effort. A realistic case study of a 25 MVA transformer was used to validate the proposed methodology. As for the accuracy of the calculations, the comparison of the results obtained by the proposed methodology and those calculated using the Finite Element Method (FEM) shows an excellent agreement between both approaches. However, the computational performance of the new approach was found to be much higher than that of FEM. This makes the proposed method much more efficient for transformer design purposes.

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Section: Equations Of Electrical Connections Between Conductorsunclassified

Section: Equations Of Electrical Connections Between Conductorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Semianalytic integral method for the fast solution of circulating currents in power transformers

Díaz

Mombello

Marulanda

2018

International Journal of Applied Electromagnetics and Mechanics

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“…8. In the near future an extension of this study will be made, and we are planning to compare copper -copper transformers against aluminium-aluminium transformers in many aspects, such as current distribution in transformer windings [43], ferroresonance [44] and inrush current [45].…”

Section: Comparison Of Total Owning Cost (Toc) Of Transformers Manufamentioning

confidence: 99%

Selection of copper against aluminium windings for distribution transformers

Olivares-Galván

León

Georgilakis

et al. 2010

IET Electr. Power Appl.

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Copper and aluminium are the two conductors most commonly used in transformer windings. This study presents a comprehensive comparison of distribution transformers built either with copper or with aluminium windings. The comparison is based on winding material conductivity, density, cost, connectivity, oxidation, machinability and behaviour under short-circuit. Additionally, a parametric analysis of transformer designs as a function of the cost of copper against aluminium is presented. The study establishes the winding material cost range that indicates when it is more economical to build the transformer windings with copper or with aluminium. All comparisons are carried out with cost of optimised transformer designs that fulfil all specifications together with manufacturing and operating constraints. This winding is called low-high-low (LHL)

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“…As a result, transformer researchers have to employ many methodologies to investigate this subject. For example, numerical technique based on either the finite difference method (FDM) or the finite element method (FEM) was applied for analyzing the transformer model [1][2][3][4]. Thermal study of transformer is one of parameters that are difficult to study.…”

Section: Introductionmentioning

confidence: 99%

Investigation of transformer performance by the finite element method

Ruangsinchaiwanich

Khongseephai

2009

2009 International Conference on Electrical Machines and Systems

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Although precise analytical methods for studying transformer performance, such as iron loss, copper loss and stray loss, are complicated, the finite element method (FEM) proved to be a potential tool for analyzing this subject. This study illustrated that transformer parameters, such as core shape, air-gap length and core type, significantly affected transformer performances. Furthermore, the 2D and 3D finite element analysis provided understandable visual for transformer designers.

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Circulating-current loss in transformer windings

Cited by 16 publications

References 4 publications

Semianalytic integral method for the fast solution of circulating currents in power transformers

Semianalytic integral method for the fast solution of circulating currents in power transformers

Selection of copper against aluminium windings for distribution transformers

Investigation of transformer performance by the finite element method

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