Ferroresonance can also be initiated in the system of Figure 9, due to a transient overvoltage following a load rejection, a fault-clearance, or during a ground fault which causes the increase of the healthy phase voltages. Due to the overvoltage transients, the iron core of one or two VTs are driven into saturation and initiate the ferroresonance phenomenon which can persist even after the transient condition is over. The corresponding ferroresonance oscillations can be observed in all three phases, one phase, or two phases. During the ferroresonance, the neutral point experiences a voltage rise with respect to ground. The phase overvoltage magnitudes can be even higher than the system normal phase-to-phase voltage and may cause dielectric breakdown of the system apparatus.