The authors deal with design and analysis of an air-core electromagnetic fault current limiter (FCL) rotary motion. proposed device is characterised by a simple structure, fast operating speed reversible operation. It consists two movable concentric air core spherical reactor rings (i.e. inner outer rings) variable mutual angular displacement. At normal condition, reactors are approximately ali...

The protection of high voltage direct current (HVDC) grids is a challenge considering that the system must detect, locate, and interrupt large fault currents in few milliseconds. Resistive type superconducting limiters (R-SFCL) can help solve difficult task, reducing extremely demanding ratings HVDC circuit breakers. This paper presents different approaches to model R-SFCLs order analyze their ...

DC system protection is more challenging than that for AC due to the rapid rate of rise fault current and absence natural zero-crossing in systems. Superconducting limiter (SFCL) systems a promising technology reduce level current, also SFCLs have no resistance during normal operation. In this paper, behaviors an SFCL coil are investigated under both low impedance high conditions condition syst...