Spotlight on Modern Transformer Design

Georgilakis, Pavlos S.

doi:10.1007/978-1-84882-667-0

Cited by 133 publications

(123 citation statements)

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“…In most of the literature where discrete design variables are used, this is done in conjunction with the use of the multiple design method, which is a heuristic technique that assigns many alternative values to the design variables so as to generate a large number of alternative designs and finally to select the design that satisfies all the problem constraints with minimum manufacturing cost [2]. Examples of such literature are [2,3,[10][11][12].…”

Section: Discrete Transformer Design Optimization (Dtdo)mentioning

confidence: 99%

“…Transformer design optimization (TDO) is defined in the literature as a mixed-integer nonlinear programming problem having complex and discontinuous objective functions and constraints, with the objective of the detailed calculation of the characteristics of a transformer based on national and/or international standards and transformer user requirements, using available materials and manufacturing processes, to minimize manufacturing cost or total owning cost (TOC), while maximizing operating performance [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Discrete design optimization of distribution transformers with guaranteed optimum convergence using the cuckoo search algorithm

Alhan¹,

Yumuşak²

2017

Turk J Elec Eng & Comp Sci

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Abstract:Transformer design optimization methods presented in the literature rarely yield solutions directly applicable in production; the design engineer usually needs to convert the theoretical solution to a practical one. This problem is addressed in this paper, and a discrete transformer design optimization method is proposed that yields solutions with commercially available or productionally feasible dimensions, thus eliminating the need for further efforts of the design engineer to make the theoretical solution a feasible one. The cuckoo search, a nature-inspired metaheuristic algorithm, is used as the optimization algorithm in this study, and it is shown that the guaranteed global optimum solution is attained in a single run. Furthermore, a simple method is proposed to reduce the number of objective function and constraint calculations. The method is based on skipping calculations for design vectors recurring during the search process by use a caching technique. It is envisaged that the use of the proposed method will make a significant contribution to the streamlining of the quotation and design processes in the transformer industry as well as standardization of production materials.

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Section: Discrete Transformer Design Optimization (Dtdo)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discrete design optimization of distribution transformers with guaranteed optimum convergence using the cuckoo search algorithm

Alhan¹,

Yumuşak²

2017

Turk J Elec Eng & Comp Sci

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“…(1)- (3)) are determined using results of software for thermal calculations based on the detailed THNM for the above specified loads of 60%, 70%, 80%, 85%, 90%, 95%, and 100% of rated load. Since there are two parameters in function (1)- (3) for each of the thermal conductances, these two parameters can theoretically be determined from the values of the losses and calculated temperature differences in two steady states ( (1) and (2)) as (example for K to and n to ): (2) ln (ϑto−ϑa) (1) (ϑto−ϑa) (2) − 1 (8)…”

Section: Determination Of Parameters Of Thermal Networkmentioning

confidence: 99%

“…The hot-spot insulation temperature represents typically the most important limiting factor for transformer loading [1]. The hot-spot temperature has to be under a prescribed limit value.…”

Section: Introductionmentioning

confidence: 99%

Thermal model of oil power transformers with a tap changer

Radaković¹,

Tenbohlen²

2016

Turk J Elec Eng & Comp Sci

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Abstract:The paper presents a new method for on-line temperature calculation taking into account change in the tap changer position. The method introduces accurate calculation of the losses, depending on the current, average temperature of the winding, and tap changer position (it affects both Joules (DC) losses and stray losses). The thermal model itself is the common three-body model (for a transformer with two windings per phase), with temperature dependent thermal conductances. Elements of the model describing steady-state characteristics are determined based on detailed construction and calculation of distribution of losses in the windings using the finite-elements method (FEM) and calculation of distribution of temperatures using the detailed thermal-hydraulic network model (THNM). Detailed calculation of the losses and temperatures enables the determination of the hot-spot factor ( H = Q S) ; factor Q describes the nonuniform losses and factor S describes nonuniform cooling. The paper shows how these factors depend on tap changer position and the load.

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“…Transformers are one of the most expensive and critical components of electric energy transmission and generation systems [1]. Although transformers are very reliable machines a failure is possible at any age due to many factors as incorrect specification or operation, design or manufacturing errors, bad maintenance, excessive ageing... [2].…”

Section: Introductionmentioning

confidence: 99%

Study of the distribution of temperatures in the windings of a transformer after suffering a short-circuit.

Fernández¹,

Carcedo²,

Fernández³

et al. 2014

REPQJ

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Abstract.Power transformers are electrical machines that allow us to transport electric energy, with reduced losses, from generation stations to consumption points. This definition gives us an idea of the number of machines of this type that are used in power distribution systems worldwide. The lifespan of this equipment often exceeds 30 years of operation. Therefore, they can be described as very robust equipment. The main problem that may affect power transformers is the operation at high temperature. This paper summarizes the results of a post mortem study carried out on an 800 kVA distribution transformer. The methodology that is considered for estimating the temperature distribution in the windings of the machine is based on the calculation of the degree of polymerization of the dielectric paper. This parameter is associated with the state of the paper insulation that protects the conductors of the windings. By knowing the value of this magnitude for a new and for an aged paper, and the period of operation of a transformer, the temperature distribution along the height of the windings can be estimated. With these results and the loading regime that a transformer has endured throughout his life, one can draw conclusions for future designs or for similar transformers still in operation.

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Spotlight on Modern Transformer Design

Cited by 133 publications

References 0 publications

Discrete design optimization of distribution transformers with guaranteed optimum convergence using the cuckoo search algorithm

Discrete design optimization of distribution transformers with guaranteed optimum convergence using the cuckoo search algorithm

Thermal model of oil power transformers with a tap changer

Study of the distribution of temperatures in the windings of a transformer after suffering a short-circuit.

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