Behavior of the ferroresonant series circuit containing a square-loop reactor

An analysis is given for the behavior of the ferroresonant series circuit containing a reactor with 50% NiFe grain-oriented core material. Consideration is given to several different kinds (or modes) of steady-state circuit response at fundamental as well as at subharmonic frequencies for both sinusoidal and square-wave applied voltages. Conditions are derived which are necessary for the stable existence of these modes, and methods are given for the study of the transient processes by which these various steady-state modes are attained.