  We present general principles of the parameters calculation and application
of two power devices: an inductive fault current limiter and a current-limiting
transformer. Both the devices are based on the superconducting - normal state
transition in a superconducting switching element magnetically coupled with a
primary winding. The relationships between the design parameters of the devices
and the limited current, losses and temperature in the superconducting element
were investigated. It is shown that, in spite of similarity, the devices have
distinctive features manifested in different depths of the fault current
limitation. The case of performance of the superconducting winding in the form
of HTS BSCCO hollow cylinders is analyzed. Basic parameters of the devices are
evaluated for their application in 45 MVA power circuit. Problems of the
transition into the normal state and recovery of the superconducting state in
the switching element are discussed.
