The efficiencies of superconducting machinery are not clear-cut, but depend on
many different issues, such as, among other things, the properties of the chosen
HTS-material, the geometry of the superconducting tapes and the cooling system
which can be based on either LN2 or mechanical cryocoolers. All of these influence
the losses of the devices and thus it is not possible to precisely express the efficiency
figures of superconducting devices. A superconducting 30 MVA transformer, with
an efficiency of 99.97%, was designed by a French group [7],
The efficiencies of superconducting machinery are not clear-cut, but depend onmany different issues, such as, among other things, the properties of the chosenHTS-material, the geometry of the superconducting tapes and the cooling systemwhich can be based on either LN2 or mechanical cryocoolers. All of these influencethe losses of the devices and thus it is not possible to precisely express the efficiencyfigures of superconducting devices. A superconducting 30 MVA transformer, withan efficiency of 99.97%, was designed by a French group [7],
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