Publication

Frequency dependence of A.c. loss in Bi(2223)Ag sheathed tapes

Bertrand Dutoit, Svetlomir Stavrev
1998
Journal Articles

Abstract

The a.c. self-field loss in Bi(2223)Ag sheathed tapes with different number of filaments has been measured between 59 and 2500 Hz by means of a dual lock-in amplifier. Due to the wide frequency range of the measurements we have been able to dissociate quantitatively the different self-field loss contributions: hysteretic, eddy current and resistive loss (near Ic). This is an important advantage compared to single frequency measurements where such loss dissociation is only qualitative. The hysteresis losses of the different tapes fall between Norris’ predictions for elliptical and strip cross section. The relative weight of eddy current loss is found to be inversely proportional to the current ratio – the higher i, the less is their contribution. Frequency independent resistive loss due to flux creep is observed for high currents at low frequencies; this loss becomes quickly negligible with the increasing frequency.

Official source

https://infoscience.epfl.ch/entities/publication/19a5dcea-ef5c-4a3c-85d6-00ef5bf40e27

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Bertrand Dutoit, Svetlomir Stavrev
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/19a5dcea-ef5c-4a3c-85d6-00ef5bf40e27

About this result

Related concepts (32)

Eddy current

In electromagnetism, eddy currents (also called Foucault's currents) are loops of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor.

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.

Utility frequency

The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user. In large parts of the world this is 50 Hz, although in the Americas and parts of Asia it is typically 60 Hz. Current usage by country or region is given in the list of mains electricity by country.

Related publications (3)

Frequency dependence of A.c. loss in Bi(2223)Ag sheathed tapes

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