ABSTRACT
A wide variety of power-protection technologies are available to solve specific problems at a given facility. Various levels of protection can be provided using the following devices:
• Ferroresonant transformer • Isolation transformer • Tap-changing regulator • Line conditioner
Ferroresonant transformers exhibit unique voltage-regulation characteristics that have proven valuable in a wide variety of applications. Voltage output is fixed by the size of the core, which saturates each half-cycle, and by the turns ratio of the windings. Voltage output is determined at the time of manufacture and cannot be adjusted. The secondary circuit resonance depends upon capacitors, which work with the saturating inductance of the device to keep the resonance active. A single-phase ferroresonant transformer is shown in Figure 14.1.
