Recently, ASG Superconductors, a leader in superconducting magnets, has designed an innovative superconducting fault current limiter (SFCL) and demonstrated its full functionality. The 36kV system is currently undergoing a “type test†in Berlin's IPH independent laboratory, which is more severe than a typical physical grid short circuit.
The SFCL system uses a new magnesium diboride superconducting wire and is an induction system that can be used as a variable impedance component. Under operating conditions, the device is completely "invisible" to the grid, thus avoiding dispersion or interference, and can automatically convert itself to very high impedance (ie, limit fault current) as soon as it is shorted.
Unlike conventional solutions that require low temperature fluids, the SFCL system can operate without any cryogenic fluid and reduce maintenance requirements. The use of magnesium diboride superconducting wire also enables the system to be more efficient than conventional systems by reducing energy consumption.
The SFCL device operates immediately after intervening in the short-circuit of the grid, and the recovery time is measured in milliseconds, making it an advantage over other solutions that are planned to go on the market. Moreover, the product has made significant progress in supporting continuous power supply, and it also eliminates the need to recover the cost of damaged grid components in the event of a short circuit. Related studies have confirmed that SFCL systems are often the most cost-effective solution to the problems associated with the growing short-circuit currents of medium and high voltage power grids.
It is reported that in addition to the 36kV system, ASG has also designed a 123kV system, which is suitable for the operation of the transmission network in key systems in most European countries.
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