Publication

Analysis of magnetic field and geometry effects in the design of HTS devices for AC power applications

Francesco Grilli, Bertrand Dutoit, Bertrand Dutoit
2005
Conference Papers

Abstract

The performance of HTS devices is strongly influenced by local values of the current/field distributions. In this paper, we investigate the influence of the magnetic field and of the geometrical configuration on the loss behaviour of a 200kVA FCL prototype, composed by Bi-2223/Ag tapes wound around a cylindrical support, as function of different operating ac currents. The investigation is done by means of FEM computations, with the use of an axisymmetric 2D A-V formulation for taking into account the cylindrical geometry. The electrical behaviour of the superconductor is described by means of a B-dependent E-J power-law relation, derived from experimental measurements with field of different orientation. Several geometrical configurations are analyzed and compared, in order to find the ones with lowest AC loss. The developed method can be applied for investigating devices other than FCL, such as superconducting transformers and magnets, where the local distribution of the magnetic field and the arrangement of the conductors play an important role. This work is supported partially by the Swiss project “MaNEP” and partially by the Italian project “Ricerca di Sistema”.

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https://infoscience.epfl.ch/entities/publication/e252799a-dd10-4b7c-8450-2ba1de5157d5

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Francesco Grilli, Bertrand Dutoit, Bertrand Dutoit
2005
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e252799a-dd10-4b7c-8450-2ba1de5157d5

About this result

Related concepts (32)

Electric current

An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes.

Alternating current

Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight.

Magnetic field

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets.

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