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Project ID: G5RD-CT-2000-00219
Finanziato nell'ambito di: FP5-GROWTH
Paese: Switzerland

Equivalent circuit model for superconductors

An equivalent circuit model for superconductors was developed, describing the behaviour of the conductor as viewed by an external user, for whom the global variables voltage, current and power losses are of interest. It can be used in time-continuous simulations with arbitrary input current or voltage waveforms and treats well both the sub-critical and super-critical current regime. The model is based on Maxwell¿s equations, measurement results, as well on the physical structure of the superconducting wires.

Both current and voltage can be used as driving sources. It was implemented in the engineering software MATLAB, in whose environment a user-friendly graphical interface was created, facilitating the exploitation of the model. A new, modified power-law was used for describing the voltage-current relation of the superconducting material for currents above the critical one. The outputs of the model are the instantaneous current, voltage and power loss waveforms.

The model is fast, compared to finite element simulations or other similar methods, and easy to apply. It may be used for modelling of superconducting devices, such as fault-current limiters and power cables.


Bertrand DUTOIT
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