Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

FP5

BIG-POWA Berichtzusammenfassung

Project ID: G5RD-CT-2000-00219
Gefördert unter: FP5-GROWTH
Land: France

Electro and thermodynamic behaviour during transients

Any electrical device experiences transient over-currents and the response of a superconducting winding to over-currents is an important issue. The behaviour of superconducting elements (tape alone and coils) under currents above their critical value has been experimentally carried out. If a single tape can withstand very high over-currents (5-10 Ic), a superconducting coils with several non-cooled layers is much more sensitive to over-currents.

For a nine layer coil, the temperature of 200 K is reached after a delay of only 0.29 s for an over-current of 2.65 Ic (Je = 34 MA/m2). Several coils with temperature sensors were built and tested. The runaway logically occurs at lower currents compared to the critical one when the wire critical current density increases. The thermal runaway even appears very closed to the critical current, 1.4 Ic (Je = 34 MA/m2).

Some numerical simulations (finite element method) in steady state show a good agreement between the measured and calculated temperatures taking into account the inaccuracy for some thermal data. Some temperature calculations have been made also in transient considering adiabatic conditions. The agreement with the measured temperatures is good if the tape volume is multiply by a factor two.

Any electrical device experiences transient over-currents and the response of a superconducting winding to over-currents is an important issue. The behaviour of superconducting elements (tape alone and coils) under currents above their critical value has been experimentally carried out. If a single tape can withstand very high over-currents (5-10 Ic), a superconducting coils with several non-cooled layers is much more sensitive to over-currents.

For a nine layer coil, the temperature of 200 K is reached after a delay of only 0.29 s for an over-current of 2.65 Ic (Je = 34 MA/m2). Several coils with temperature sensors were built and tested. The runaway logically occurs at lower currents compared to the critical one when the wire critical current density increases. The thermal runaway even appears very closed to the critical current, 1.4 Ic (Je = 34 MA/m2).

Some numerical simulations (finite element method) in steady state show a good agreement between the measured and calculated temperatures taking into account the inaccuracy for some thermal data. Some temperature calculations have been made also in transient considering adiabatic conditions. The agreement with the measured temperatures is good if the tape volume is multiply by a factor two.

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CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)
Rue Michel-Ange 3
38402 Saint Martin d’Hères Cedex,
France
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