Certain critical Equipment, especially Medical Equipment, require Solid State Voltage Stabilizers with Galvanic Isolation between Mains Input and Equipment. Also the Equipment needs to be protected against spikes, voltage, surges, glitches, noise, etc. which is not possible with conventional Servo Voltage Controlled Stabilizers.
A special type of Stabilizer, called C.V.T (Constant Voltage Stabilizer) is used for such applications. A CVT works on magnetic saturation principle, resonating with a tank circuit of High Q factor. When incoming Mains Voltage is low the capacitor provides the necessary additional gain in power, keeping the output voltage steady. On the other hand, when the Mains Voltage is high the leakage reactance drops the difference of voltage. This correction of voltage is instantaneous even for sudden dips and spikes.