In this paper,a saturated-core fault current limiter(FCL) with improved permanent magnet(PM) modules is proposed.A nonlinear equivalent electric circuit model of the saturated-core FCL is also provided.PM modules are used to excite magnetomotive force(MMF) for the cores from different directions and to increase magnetic flux density in the cores,thereby reducing demand for DC magnetizing current.By analyzing magnetic flux coupling between FCL coils and achieving parameters of self inductances and mutual ind...