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Liquid nitrogen is often used in superconducting high voltage apparatus for cooling and for electrical insulation purposes. A temperature increase of the superconductor surface, e. g. to room temperature during a quench of a fault current limiter, may cause a decrease of the breakdown voltage within the apparatus by generation of nitrogen gas bubbles. A cryostat was equipped with a sphere to plane...
For superconducting high voltage devices liquid nitrogen can not only be used as cooling liquid but also for electrical insulation purposes. Under the programme of a 110 kV fault current limiter project the breakdown and withstand voltages of liquid nitrogen are examined in a new cryogenic high voltage test facility named "Fatelini". Target withstand voltages for this new facility itself...
Superconducting fault current limiters (SCFCLs) are new and attractive devices to limit short-circuit currents in power systems. In recent years, the technical feasibility of SCFCLs in medium voltage applications was successfully demonstrated in several field tests. In high voltage power systems the application of SCFCLs is very attractive too, because at this voltage level conventional devices to...
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