Journal ArticleDOI
New transformer model including joint air gaps and lamination anisotropy
M. Elleuch,M. Poloujadoff +1 more
Reads0
Chats0
TLDR
In this paper, a three phase transformer model is presented, taking into account air gaps, saturation, core losses, and lamination anisotropy, and the flux distribution in a straight overlap joint has been investigated using a lumped circuit model.Abstract:
A new three phase transformer model is presented in this paper, taking into account air gaps, saturation, core losses, and lamination anisotropy. The flux distribution in a straight overlap joint has been investigated using a lumped circuit model. It is shown that the actual air gap varies largely between an upper and a lower limit as a function of core saturation. Therefore, mitered joints have been modeled using a new concept of an equivalent variable air gap. This consists of defining the length of an equivalent air gap as a function of the instantaneous value of the flux in the laminations. A new approach to the core loss modeling is highlighted. It is characterized by a nonlinear conductance placed in parallel with the saturated magnetizing inductance. Furthermore, transformer yokes and limbs have been divided into longitudinal elements according to the rolling direction to take into account the lamination anisotropy effects. The transient and steady state behaviors of the transformer model have been tested. A good agreement is obtained between computed and measured results.read more
Citations
More filters
Journal ArticleDOI
Multiobjective genetic algorithm solution to the optimum economic and environmental performance problem of small autonomous hybrid power systems with renewables
TL;DR: In this article, a non-dominated sorting genetic algorithm (NSGA-II) was used to solve the multi-objective optimisation problem of small autonomous hybrid power systems (SAHPS).
Journal ArticleDOI
Transformer Design and Optimization: A Literature Survey
TL;DR: In this article, the authors conduct a literature survey and reveal general backgrounds of research and developments in the field of transformer design and optimization for the past 35 years, based on more than 420 published articles, 50 transformer books, and 65 standards.
Journal ArticleDOI
Estimation of transformer saturation characteristics from inrush current waveforms
TL;DR: In this paper, a novel method to estimate transformer saturation characteristics that extend to the 'deep' saturation region is presented, using recorded inrush voltage and current waveforms to estimate the saturation characteristics.
Journal ArticleDOI
Transformer Core Parameter Identification Using Frequency Response Analysis
TL;DR: A novel model-based approach for parameter identification of a laminated core, such as magnetic permeability and electrical conductivity, of power transformers on the basis of frequency response analysis (FRA) measurements, which establishes a transformer core model using the duality principle between magnetic and electrical circuits for parameter Identification with genetic algorithms.
Journal ArticleDOI
A Review of Transformer Losses
TL;DR: In this article, the authors present an extensive survey of current research on the transformer loss problem, particularly from the view of practical engineering applications, and reveal that transformer loss remains an active research area.
References
More filters
Journal ArticleDOI
Complete transformer model for electromagnetic transients
F. de Leon,Adam Semlyen +1 more
TL;DR: In this paper, a complete, three phase transformer model for the calculation of electromagnetic transients is presented, which consists of a set of state equations solved with the trapezoidal rule of integration in order to obtain an equivalent Norton circuit at the transformer terminals.
Proceedings ArticleDOI
Modelling of saturated AC machines including air gap flux harmonic components
J.C. Moreira,Thomas A. Lipo +1 more
TL;DR: In this paper, a new saturation model for induction machines that can be easily extended to other types of AC machines is presented, where saturation is responsible for the generation of flux space harmonic components traveling in the air gap with the same synchronous speed as the fundamental flux component, with the third being the dominant harmonic component.
Journal ArticleDOI
Transient simulation and analysis of a three-phase five-limb step-up transformer following an out-of-phase synchronization
TL;DR: Theoretical and experimental analyses of the electromagnetic transient following the out-of-phase synchronization of a three-phase five-limb step-up transformer are presented in this article.
Journal ArticleDOI
A simple representation of dynamic hysteresis losses in power transformers
F. de Leon,Adam Semlyen +1 more
TL;DR: In this article, the authors describe a procedure for the representation of hysteresis in the laminations of power transformers in the simulation of electromagnetic transient phenomena, which is based on the recognition that in today's iron cores the hystresis loops are narrow and therefore the modeling details are only important in relation to the incurred losses and the associated attenuation effects.
Journal ArticleDOI
Nonlinear modeling of transformers
J.D. Greene,C.A. Gross +1 more
TL;DR: In this article, the performance of classical transformer models under nonsinusoidal excitation is investigated and two novel models for such analysis, both of which account for the transformer core magnetic nonlinearities, are presented.
Related Papers (5)
Calculation of spatial loss distribution in stacked power and distribution transformer cores
G.F. Mechler,R.S. Girgis +1 more