Behavior of three-phase transformers supplying non linear loads using time domain representation and finite element analysis

Delaiba, Antônio Carlos; Oliveira, José Carlos de; Cardoso, J.R.; Nabeta, S.Y.

doi:10.1109/20.717744

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…B 0,max of LV winding in (18) is therefore determined with high accuracy based on the suggested procedure using FEM. In fact, according to the sixth assumption of the IEEE standard, F MECL equals to 4 while Considering (18), (16) and (17) are rewritten as follows…”

Section: Suggested Derating Methods Using Combined Analytical-fe Approachmentioning

confidence: 99%

“…Some researchers have paid attention to the derating of transformers based on thermal analysis using thermal-insulation concept [15,16]. In [17], finite element method (FEM) is used to predict a three-phase transformer behaviour under non-linear load in time domain. In this method, internal electromagnetic equations and external equivalent circuit are simultaneously solved by a well-established computational package.…”

Section: Introductionmentioning

confidence: 99%

“…All the above-mentioned references can be categorised into four groups [22]: the IEEE standards [2][3][4], experimental [6][7][8][9][10][11][12], analytical [13][14][15][16] and finite elements (FE) analysis [17][18][19][20][21]. The major problem with the IEEE standards is that the proposed assumptions ultimately lead to conservative results.…”

Section: Introductionmentioning

confidence: 99%

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Derating of distribution transformers under non‐linear loads using a combined analytical‐finite elements approach

Ghazizadeh¹,

Faiz

Oraee³

2016

IET Electric Power Applications

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Supplying non-linear loads causes increased losses in transformers which eventually leads to their reduced life spans. Therefore, transformers are derated in order to protect them against premature loss of life. To do this, load losses including ohmic loss and winding eddy current (WEC) loss need to be estimated. This study suggests an improved analytical approach using finite element method (FEM) which includes all material characteristics and geometrical structures in order to calculate WEC loss under non-sinusoidal load current in each winding individually. By adopting this procedure, harmonic loss factor as a dominant parameter in transformers derating is estimated. By emphasising the region in which the maximum WEC loss occurs, an additional factor (F MECL) based on the physical phenomena involved is introduced using FEM. On the basis of the aforementioned concepts, a new relationship is presented for transformer derating. Ultimately, the suggested method and the IEEE standard are applied to derate a distribution transformer and the results are discussed. In addition, the proposed method is validated using a thermal model and its advantages over the IEEE derating method is presented.

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Section: Suggested Derating Methods Using Combined Analytical-fe Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Derating of distribution transformers under non‐linear loads using a combined analytical‐finite elements approach

Ghazizadeh¹,

Faiz

Oraee³

2016

IET Electric Power Applications

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“…In addition, FEM can be employed to analyse the performance of transformers under unbalanced load and voltage conditions [54]. FEM has also been used in [55] to investigate the capability of transformer analysis under non‐sinusoidal voltage and current. The simulated and test results are in good agreement.…”

Section: Different Methods For Transformer Deratingmentioning

confidence: 99%

Derating of transformers under non‐linear load current and non‐sinusoidal voltage – an overview

Faiz

Ghazizadeh²,

Oraee³

2015

IET Electric Power Applications

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The increasing application of non-linear loads in power system causes additional losses in transformers resulting in premature damage. Manufactures and users of transformers realise the importance of this phenomenon and it is vital to adopt a procedure to prevent it thereby enhancing the reliability of power system. To achieve this, the most common method is derating of transformers. This paper intends to review derating of transformers under nonsinusoidal operation, for which all available approaches are classified into four major methods including IEEE recommended, analytical, experimental and finite elements based method. For each method, the fundamental theory, significant factors related to derating, test techniques as well as advantages and disadvantages are discussed. The methods are then evaluated and compared with each other from different points of view. Moreover, the overall trend of a more precise derating method is suggested. This review clarifies the research areas which require attention in the future to advance the subject.

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“…Finite Element (FE) based modeling use two or three-dimensional finite element method for analysis of electromagnetic fields inside the power transformer [49,50]. FE based modeling is very accurate but rather geometry oriented with very intense and slow simulations.…”

Section: Transformer Modelingmentioning

confidence: 99%

Physical dynamic simulation of shipboard power system components in a distributed computational environment

Abed¹

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Abed, Nagy Youssef, "Physical dynamic simulation of shipboard power system components in a distributed computational environment" (2007 In order to perform system studies in such an environment physical phase variable models of different components of the shipboard power system were developed using operational parameters obtained from finite element (FE) analysis.These models were developed for two types of studies low and high frequency studies. Low frequency studies are used to examine the shipboard power systems v behavior under load switching, and faults. High-frequency studies were used to predict abnormal conditions due to overvoltage, and components harmonic behavior. Different experiments were conducted to validate the developed models. The Simulation and experiment results show excellent agreement.The shipboard power systems components behavior under internal faults was investigated using FE analysis. This developed technique is very curial in the Shipboard power systems faults detection due to the lack of comprehensive fault test databases.A wavelet based methodology for feature extraction of the shipboard power systems current signals was developed for harmonic and fault diagnosis studies.This modeling methodology can be utilized to evaluate and predicate the NPS components future behavior in the design stage which will reduce the development cycles, cut overall cost, prevent failures, and test each subsystem exhaustively before integrating it into the system.

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Behavior of three-phase transformers supplying non linear loads using time domain representation and finite element analysis

Cited by 9 publications

References 5 publications

Derating of distribution transformers under non‐linear loads using a combined analytical‐finite elements approach

Derating of distribution transformers under non‐linear loads using a combined analytical‐finite elements approach

Derating of transformers under non‐linear load current and non‐sinusoidal voltage – an overview

Physical dynamic simulation of shipboard power system components in a distributed computational environment

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