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Field-Circuit Coupling Applied to Inductive Fault Current Limiters

D. Lahaye[1], D. Cvoric[2], S. de Haan[2], and J. Ferreira[2]
[1]Delft Institute of Applied Mathematics, Department of Electrical Engineering, Mathematics and Computer Sciences, TU Delft, The Netherlands
[2]Electrical Power Processing Unit Department of Electrical Engineering, Mathematics and Computer Sciences, TU Delft, The Netherlands

Fault Current Limiters (FCLs) are expected to play an important role in the protection of future power systems due to the rising levels of the short-circuit currents. The inductive FCLs, comprising magnetic cores and one or more dc and ac windings, are particularly interesting because they inherently react on the fault. The so-called open-core FCL configuration employs only one magnetic core for ...

Magnetic Stimulation of the Human Brain with Low-Intensity Field

D. Lazutkin[1], A. Harkara[2], and P. Husar[1]
[1]Ilmenau University of Technology, Ilmenau, Thuringia, Germany
[2]Simpleware Limited, Exeter, Devon, United Kingdom

The most popular means of depression treatment are psychotherapy, antidepressant medication and recently adopted transcranial magnetic stimulation (TMS) of the human brain. To overcome their disadvantages we are investigating an application of low-field magnetic stimulation (LFMS) to depression treatment. The 3D electromagnetic model of LFMS has been developed. It employs 8 small coils disposed ...

Modeling Ferrofluid Flow in an Annular Gap Moving with Reciprocating Shaft

Y. He[1], R. Nilssen[1]
[1]Department of Electric Power Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Ferrofluids have been successfully used in the seals for rotary shafts, but few studies focus on the reciprocating motion seals. Since the completely different operational regimes, previous experiences on the rotary motions could not be directly applied on the cases for reciprocating shafts. In this study, we present a simplified model to describe the process that a shaft linearly moving in a ...

Magnetic Devices For a Beam Energy Recovery THz Free Electron Laser - new

R. R. S. Caetano[1], G. Cernicchiaro[2], R. M. O. Galvão[3]
[1]Universidade Federal do Rio de Janeiro, Macaé, RJ, Brazil
[2]Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, RJ, Brazil
[3]Instituto de Física USP, São Paulo, SP, Brazil

This paper presents a numerical analysis of magnetic devices, dipole, quadrupole and undulator and a THz Free Electron Laser (FEL) electron-beam recovery system. Free Electron Laser are an important source of coherent radiation being used in the study of chemical properties of substances, thus being an important tool for various fields of science such as condensed matter physics, chemistry, ...

关于气泡在LIMCA系统中变形的数值模拟 - new

杨文志[1], 王晓东[1]
[1]中国科学院大学,北京,中国

LIMCA技术是一种原位测量高温液态金属中杂质颗粒的方法。测量的原理为:在一个小孔内外设置一对电极,并且通以电流,这样可以在孔口附近形成一个电敏感区,当杂质经过电敏感区时,通过测量电压脉冲信号以检测杂质的信息。对硬质颗粒的LIMCA技术已经有了许多研究,但实际情况下有些颗粒如气泡是可变形的,这将损害LIMCA的精度。 模型使用了 COMSOL Multiphysics® 中的“层流两相流-相场”和“电磁场”模式,气泡和液态铝以相同的初始速度向相同方向运动,同时在液态导电金属中通以电流。由于流体和气泡是运动的,流动会受到洛伦兹力的影响,所以在流场中加入由电磁场计算得到的“mef.FLtzr”和“mef.FLtzz”作为体积力源项。同时流动结构的改变也会影响电磁场,两个物理场之间存在着强耦合,需要同时求解。 数值计算结果给出了在气泡变形情况下的流场、电磁场 ...

Implicit Large Eddy Simulations of 2D Flow and Heat Transfer in Thermoacoustic Resonators

N. Martaj [1,2], S. Savarese [3], S. Kouidri [3], M. M. ALI [4,5]
[1] EPF Ecole d’ingénieurs, Montpellier, France
[2] Institut d'Electronique et des Systèmes, Université de Montpellier, Montpellier, France
[3] Armélio, Les Ulis, Courtabœuf, France
[4] LIMSI-CNRS, Orsay, France
[5] UPMC Univ Paris 06, Paris, France

The reduction of energy consumption in the building sector (nearly 40% of the energy consumption in Europe) is a real challenge to achieve the objective of the “2020 European climate and energy package”. In recent years, great interest is observed for the Stirling thermoacoustic machines. Nonlinearities due to the high level of acoustic pressure generate DC flows that are superimposed on the ...

Predicting Critical Current as a Function of Magnetic Field in High-Temperature Superconductors

J. Doody [1], P. Michael [1], R. Vieria [1], W. Beck [1], L. Zhou [1], J. Irby [1],
[1] Massachusetts Institute of Technology - Plasma Science and Fusion Center, Cambridge, MA, USA

REBCO tapes belong to a class of high-temperature superconductors (HTS) that can be superconducting at liquid nitrogen temperatures (77K) as opposed to typical superconductors such as Nb3Sn which need to operate at liquid helium temperatures (4K). One important aspect of designing a super conducting coil is the ability to predict the critical current above which the conductor becomes ...

Model of Microwave-Assisted Thermal Adhesion of Synthetic Leather to a Plastic Substrate

S. Soldatov [1], J. Meiser [2], B. Lepers [1], G. Link [1], J. Jelonnek [3],
[1] Karlsruhe Institute of Technology (KIT, IHM), Karlsruhe, Germany
[2] Carl Meiser GmbH & Co. KG, Albstadt, Germany
[3] Karlsruhe Institute of Technology (KIT, IHM, IHE), Karlsruhe, Germany

The lamination of substrates with thin coatings is commonly used in furniture, automotive and avionic industries. In the lamination process the hot melt adhesives are widely used and typically activated at temperatures from 80°C to 140°C by resistive heating. This requires a heat transfer through the coating and/or the substrate. To make the process more flexible, to decrease its energy ...

Electromagnetic Characteristics of Superconducting Coils Exposed to Travelling Magnetic Fields

Tianyong Gong [1],
[1] Southwest Jiaotong University, Chengdu, China

Two-generation superconducting coils carrying large current in alternating magnetic fields is very common in electrical applications such as HTS linear motor. So it is meaningful to study the characteristics of coated superconductors in the presence of travelling magnetic field. In this paper, by using the finite element simulation software COMSOL Multiphysics® software, the characteristics of ...

COMSOL Multiphysics Modelling for Measurement Device of Electrical Resistivity in Laboratory Test Cell

C. Rémi, M. Bergeron, and S. Moreau
Cemagref
Antony, France

Bioreactor landfill is based on a homogeneous distribution of the moisture content to increase waste biodegradation. Most of studies have shown that Electrical Resistivity Tomography (ERT) can be a suitable method to study water content variation (2D and 3D). ERT is influenced by many physical parameters and no single relationship with volumetric water content was yet established for Municipal ...