A SATURABLE-CORE REACTOR works upon the principle that increasing the current through a
coil decreases the permeability of the core; the decreased permeability decreases the inductance of the
coil which causes an increase in current (power) through the load.
The IDEAL OPERATING POINT of a saturable-core reactor is on the KNEE OF THE
MAGNETIZATION CURVE. At this point, small changes in control current will cause large changes in
load current (power).