What is superconducting magnetic energy storage (SMES)?
Superconducting magnetic energy storage (SMES) systems store energy in the magnetic field created by the flow of direct current in a superconducting coil that has been cryogenically cooled to a temperature below its superconducting critical temperature. This use of superconducting coils to store magnetic energy was invented by M. Ferrier in .
Does a superconducting coil have a maximum charging rate?
This means that there exists a maximum charging rate for the superconducting material, given that the magnitude of the magnetic field determines the flux captured by the superconducting coil. In general power systems look to maximize the current they are able to handle.
What happens if a superconducting coil reaches a critical field?
Above a certain field strength, known as the critical field, the superconducting state is destroyed. This means that there exists a maximum charging rate for the superconducting material, given that the magnitude of the magnetic field determines the flux captured by the superconducting coil.
Are superconductors viable for other applications?
Future developments in the components of SMES systems could make them more viable for other applications; specifically, superconductors with higher critical temperatures and critical current densities. These limits are the same faced in other industrial usage of superconductors.
Why do superconductors have a high critical temperature?
A substance with a high critical temperature will generally have a higher critical current at low temperature than a superconductor with a lower critical temperature. This higher critical current will raise the energy storage quadratically, which may make SMES and other industrial applications of superconductors cost-effective.
What is YBCO superconducting transition temperature?
Recent development of HTS wire made of YBCO with a superconducting transition temperature of around 90 K shows promise.Typically, the higher the superconducting transition temperature, the higher the maximum current density the superconductor can sustain before Cooper pair breakdown.
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