Fault current limiter

A fault current limiter (FCL) comprising:

• a plurality of magnetisable core member pairs arranged in a stacked formation;
• at least one AC coil configured to generate a varying magnetic flux in at least a portion of the plurality of magnetisable core member pairs of the stacked formation;
• and
• a plurality of static magnetomotive force sources configured to provide a magnetic circuit within at least part of the plurality of magnetisable core member pairs of the stack formation, wherein at least part of the plurality of static magnetomotive force sources are positioned between corresponding magnetisable core member pairs of the stacked formation,
• wherein the at least one AC coil produces an AC flux that is orthogonal to magnetic moments produced by the plurality of static magnetomotive force sources,
• wherein the magnetisable core members contain at least one air gap,
• wherein at least one air gap is arranged between two adjacent permanent magnets of the a plurality of static magnetomotive force sources so as to space apart the two adjacent magnets,
• wherein the at least one air gap in the magnetisable core members is positioned above and below respective surfaces of pole faces of the adjacent permanent magnets, and
• wherein at least one of the adjacent permanent magnets is intersected by an air gap.